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authorUlrich Drepper <drepper@redhat.com>1997-08-27 20:26:10 +0000
committerUlrich Drepper <drepper@redhat.com>1997-08-27 20:26:10 +0000
commit92f1da4da04a7a86ddee91be5eaf0b10c333ac64 (patch)
tree2a10ce9e4e407e7e5b5ca092ca0947d234b5ff60 /db2/lock
parent22be878ecbc66606371bd33258f56e6711e6ba7a (diff)
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1997-08-10 19:17 Philip Blundell <Philip.Blundell@pobox.com> * nss/nss_db/db-XXX.c: Include <db_185.h> not <db.h>. Somebody should update this to use the new db API. * nss/nss_db/db-netgrp.c: Likewise. * nss/nss_db/db-alias.c: Likewise. * db2/Makefile: Makefile for db-2.x in glibc. 1997-08-27 21:20 Ulrich Drepper <drepper@cygnus.com> * csu/Makefile (before-compile): New goal. Make sure abi-tag.h is generated. [$(elf)=yes] (asm-CPPFLAGS): Make sure abi-tag.h file can be found. * Makeconfig [$(build-omitfp)=yes] (CFLAGS-.o): Add -D__USE_STRING_INLINES. * string/string.f: Move strnlen optimization after inclusion of <bits/string.h>. Include <bits/string.h> only if __USE_STRING_INLINES is defined. * sysdeps/generic/memcpy.c: Undef memcpy to allow macro of this name in <bits/string.h>. * sysdeps/generic/memset.c: Likewise. * sysdeps/i386/string.h: i386 optimized string functions. * sysdeps/i386/i486string.h: i486+ optimized string functions. * Makefile (subdirs): Change db to db2. * shlib-versions: Bump libdb verion number to 3. * include/db.h: Include from db2 directory. * include/db_185.h: New file. * sysdeps/i386/Makefile [$(subdirs)=db2] (CPPFLAGS): Add macros to provide spinlock information for db2. * sysdeps/m68k/m68020/Makefile: New file. Likewise. * sysdeps/sparc/Makefile: New file. Likewise. * sysdeps/unix/sysv/linux/Makefile [$(subdirs)=db2] (CPPFLAGS): Add -DHAVE_LLSEEK. * db2/config.h: Hand-edited config file for db2 in glibc. * db2/compat.h: New file from db-2.3.4. * db2/db.h: Likewise. * db2/db_185.h: Likewise. * db2/db_int.h: Likewise. * db2/makedb.c: Likewise. * db2/btree/bt_close.c: Likewise. * db2/btree/bt_compare.c: Likewise. * db2/btree/bt_conv.c: Likewise. * db2/btree/bt_cursor.c: Likewise. * db2/btree/bt_delete.c: Likewise. * db2/btree/bt_open.c: Likewise. * db2/btree/bt_page.c: Likewise. * db2/btree/bt_put.c: Likewise. * db2/btree/bt_rec.c: Likewise. * db2/btree/bt_recno.c: Likewise. * db2/btree/btree_auto.c: Likewise. * db2/btree/bt_rsearch.c: Likewise. * db2/btree/bt_search.c: Likewise. * db2/btree/bt_split.c: Likewise. * db2/btree/bt_stat.c: Likewise. * db2/btree/btree.src: Likewise. * db2/common/db_appinit.c: Likewise. * db2/common/db_err.c: Likewise. * db2/common/db_byteorder.c: Likewise. * db2/common/db_apprec.c: Likewise. * db2/common/db_salloc.c: Likewise. * db2/common/db_log2.c: Likewise. * db2/common/db_region.c: Likewise. * db2/common/db_shash.c: Likewise. * db2/db/db.c: Likewise. * db2/db/db.src: Likewise. * db2/db/db_conv.c: Likewise. * db2/db/db_dispatch.c: Likewise. * db2/db/db_dup.c: Likewise. * db2/db/db_overflow.c: Likewise. * db2/db/db_pr.c: Likewise. * db2/db/db_rec.c: Likewise. * db2/db/db_ret.c: Likewise. * db2/db/db_thread.c: Likewise. * db2/db/db_auto.c: Likewise. * db2/db185/db185.c: Likewise. * db2/db185/db185_int.h: Likewise. * db2/dbm/dbm.c: Likewise. * db2/hash/hash.c: Likewise. * db2/hash/hash.src: Likewise. * db2/hash/hash_page.c: Likewise. * db2/hash/hash_conv.c: Likewise. * db2/hash/hash_debug.c: Likewise. * db2/hash/hash_stat.c: Likewise. * db2/hash/hash_rec.c: Likewise. * db2/hash/hash_dup.c: Likewise. * db2/hash/hash_func.c: Likewise. * db2/hash/hash_auto.c: Likewise. * db2/include/mp.h: Likewise. * db2/include/btree.h: Likewise. * db2/include/db.h.src: Likewise. * db2/include/db_int.h.src: Likewise. * db2/include/db_shash.h: Likewise. * db2/include/db_swap.h: Likewise. * db2/include/db_185.h.src: Likewise. * db2/include/txn.h: Likewise. * db2/include/db_am.h: Likewise. * db2/include/shqueue.h: Likewise. * db2/include/hash.h: Likewise. * db2/include/db_dispatch.h: Likewise. * db2/include/lock.h: Likewise. * db2/include/db_page.h: Likewise. * db2/include/log.h: Likewise. * db2/include/db_auto.h: Likewise. * db2/include/btree_auto.h: Likewise. * db2/include/hash_auto.h: Likewise. * db2/include/log_auto.h: Likewise. * db2/include/txn_auto.h: Likewise. * db2/include/db_ext.h: Likewise. * db2/include/btree_ext.h: Likewise. * db2/include/clib_ext.h: Likewise. * db2/include/common_ext.h: Likewise. * db2/include/hash_ext.h: Likewise. * db2/include/lock_ext.h: Likewise. * db2/include/log_ext.h: Likewise. * db2/include/mp_ext.h: Likewise. * db2/include/mutex_ext.h: Likewise. * db2/include/os_ext.h: Likewise. * db2/include/txn_ext.h: Likewise. * db2/include/cxx_int.h: Likewise. * db2/include/db_cxx.h: Likewise. * db2/include/queue.h: Likewise. * db2/lock/lock.c: Likewise. * db2/lock/lock_conflict.c: Likewise. * db2/lock/lock_util.c: Likewise. * db2/lock/lock_deadlock.c: Likewise. * db2/log/log.c: Likewise. * db2/log/log_get.c: Likewise. * db2/log/log.src: Likewise. * db2/log/log_compare.c: Likewise. * db2/log/log_put.c: Likewise. * db2/log/log_rec.c: Likewise. * db2/log/log_archive.c: Likewise. * db2/log/log_register.c: Likewise. * db2/log/log_auto.c: Likewise. * db2/log/log_findckp.c: Likewise. * db2/mp/mp_bh.c: Likewise. * db2/mp/mp_fget.c: Likewise. * db2/mp/mp_fopen.c: Likewise. * db2/mp/mp_fput.c: Likewise. * db2/mp/mp_fset.c: Likewise. * db2/mp/mp_open.c: Likewise. * db2/mp/mp_region.c: Likewise. * db2/mp/mp_pr.c: Likewise. * db2/mp/mp_sync.c: Likewise. * db2/mutex/68020.gcc: Likewise. * db2/mutex/mutex.c: Likewise. * db2/mutex/README: Likewise. * db2/mutex/x86.gcc: Likewise. * db2/mutex/sparc.gcc: Likewise. * db2/mutex/uts4.cc.s: Likewise. * db2/mutex/alpha.dec: Likewise. * db2/mutex/alpha.gcc: Likewise. * db2/mutex/parisc.gcc: Likewise. * db2/mutex/parisc.hp: Likewise. * db2/os/db_os_abs.c: Likewise. * db2/os/db_os_dir.c: Likewise. * db2/os/db_os_fid.c: Likewise. * db2/os/db_os_lseek.c: Likewise. * db2/os/db_os_mmap.c: Likewise. * db2/os/db_os_open.c: Likewise. * db2/os/db_os_rw.c: Likewise. * db2/os/db_os_sleep.c: Likewise. * db2/os/db_os_stat.c: Likewise. * db2/os/db_os_unlink.c: Likewise. * db2/txn/txn.c: Likewise. * db2/txn/txn.src: Likewise. * db2/txn/txn_rec.c: Likewise. * db2/txn/txn_auto.c: Likewise. * db2/clib/getlong.c: Likewise. * db2/progs/db_archive/db_archive.c: Likewise. * db2/progs/db_checkpoint/db_checkpoint.c: Likewise. * db2/progs/db_deadlock/db_deadlock.c: Likewise. * db2/progs/db_dump/db_dump.c: Likewise. * db2/progs/db_dump185/db_dump185.c: Likewise. * db2/progs/db_load/db_load.c: Likewise. * db2/progs/db_printlog/db_printlog.c: Likewise. * db2/progs/db_recover/db_recover.c: Likewise. * db2/progs/db_stat/db_stat.c: Likewise. * libio/stdio.h [__cplusplus] (__STDIO_INLINE): Define as inline. * po/de.po, po/sv.po: Update from 2.0.5 translations. * sysdeps/unix/sysv/linux/netinet/tcp.h: Pretty print. * sunrpc/rpc/xdr.h (XDR): Don't define argument of x_destroy callback as const. * sunrpc/xdr_mem.c (xdrmem_destroy): Don't define argument as const. * sunrpx/xdr_rec.c (xdrrec_destroy): Likewise. * sunrpx/xdr_stdio.c (xdrstdio_destroy): Likewise. 1997-08-27 18:47 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/if_index.c: Include <errno.h>. Reported by Benjamin Kosnik <bkoz@cygnus.com>. 1997-08-27 02:27 Roland McGrath <roland@baalperazim.frob.com> * abi-tags: New file. * csu/Makefile (distribute): Remove abi-tag.h. ($(objpfx)abi-tag.h): New target. * Makefile (distribute): Add abi-tags. * sysdeps/unix/sysv/linux/abi-tag.h: File removed. * sysdeps/mach/hurd/abi-tag.h: File removed. * sysdeps/stub/abi-tag.h: File removed. 1997-08-25 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/unix/make-syscalls.sh: Change output so that it generates compilation rules only for the currently selected object suffixes. 1997-08-25 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/m68k/dl-machine.h (RTLD_START): Switch back to previous section to avoid confusing the compiler. * sysdeps/alpha/dl-machine.h (RTLD_START): Likewise. * sysdeps/i386/dl-machine.h (RTLD_START): Likewise. * sysdeps/mips/dl-machine.h (RTLD_START): Likewise. * sysdeps/mips/mips64/dl-machine.h (RTLD_START): Likewise. * sysdeps/sparc/sparc32/dl-machine.h (RTLD_START): Likewise. * sysdeps/m68k/dl-machine.h (elf_machine_load_address): Use a GOT relocation instead of a constant to avoid text relocation. (ELF_MACHINE_BEFORE_RTLD_RELOC): Removed. (RTLD_START): Declare global labels as functions and add size directive. 1997-08-25 17:01 Ulrich Drepper <drepper@cygnus.com> * sysdeps/i386/bits/select.h: Correct assembler versions to work even for descriptors >= 32. * stdlib/alloca.h: Don't define alloca to __alloca since if gcc is used __alloca is not defined to __builtin_alloca and so might not be available. Reported by Uwe Ohse <uwe@ohse.de>. * sysdeps/unix/sysv/linux/sys/sysmacros.h: Define macros in a special way if gcc is not used and so dev_t is an array. Reported by Uwe Ohse <uwe@ohse.de>. 1997-08-23 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * manual/libc.texinfo: Reorder chapters to match logical order. 1997-08-25 12:22 Ulrich Drepper <drepper@cygnus.com> * sunrpc/rpc/xdr.h: Change name of parameters in prototypes of xdr_reference, xdrmem_create, and xdrstdio_create because of clash with g++ internal symbols. Patch by Sudish Joseph <sj@eng.mindspring.net>. * elf/dl-deps.c: Implement handling of DT_FILTER.
Diffstat (limited to 'db2/lock')
-rw-r--r--db2/lock/lock.c1362
-rw-r--r--db2/lock/lock_conflict.c39
-rw-r--r--db2/lock/lock_deadlock.c496
-rw-r--r--db2/lock/lock_util.c103
4 files changed, 2000 insertions, 0 deletions
diff --git a/db2/lock/lock.c b/db2/lock/lock.c
new file mode 100644
index 0000000..8fc9133
--- /dev/null
+++ b/db2/lock/lock.c
@@ -0,0 +1,1362 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1996, 1997
+ * Sleepycat Software. All rights reserved.
+ */
+
+#include "config.h"
+
+#ifndef lint
+static const char sccsid[] = "@(#)lock.c 10.31 (Sleepycat) 8/17/97";
+#endif /* not lint */
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#endif
+
+#include "db_int.h"
+#include "shqueue.h"
+#include "db_page.h"
+#include "db_shash.h"
+#include "lock.h"
+#include "common_ext.h"
+#include "db_am.h"
+
+static void __lock_checklocker __P((DB_LOCKTAB *, struct __db_lock *, int));
+static int __lock_count_locks __P((DB_LOCKREGION *));
+static int __lock_count_objs __P((DB_LOCKREGION *));
+static int __lock_create __P((const char *, int, DB_ENV *));
+static void __lock_freeobj __P((DB_LOCKTAB *, DB_LOCKOBJ *));
+static int __lock_get_internal __P((DB_LOCKTAB *, u_int32_t, int, const DBT *,
+ db_lockmode_t, struct __db_lock **));
+static int __lock_grow_region __P((DB_LOCKTAB *, int, size_t));
+static int __lock_put_internal __P((DB_LOCKTAB *, struct __db_lock *, int));
+static void __lock_remove_waiter
+ __P((DB_LOCKTAB *, DB_LOCKOBJ *, struct __db_lock *, db_status_t));
+static void __lock_reset_region __P((DB_LOCKTAB *));
+static int __lock_validate_region __P((DB_LOCKTAB *));
+#ifdef DEBUG
+static void __lock_dump_locker __P((DB_LOCKTAB *, DB_LOCKOBJ *));
+static void __lock_dump_object __P((DB_LOCKTAB *, DB_LOCKOBJ *));
+static void __lock_printlock __P((DB_LOCKTAB *, struct __db_lock *, int));
+#endif
+
+/*
+ * Create and initialize a lock region in shared memory.
+ */
+
+/*
+ * __lock_create --
+ * Create the lock region. Returns an errno. In most cases,
+ * the errno should be that returned by __db_ropen, in which case
+ * an EAGAIN means that we should retry, and an EEXIST means that
+ * the region exists and we didn't need to create it. Any other
+ * sort of errno should be treated as a system error, leading to a
+ * failure of the original interface call.
+ */
+static int
+__lock_create(path, mode, dbenv)
+ const char *path;
+ int mode;
+ DB_ENV *dbenv;
+{
+ struct __db_lock *lp;
+ struct lock_header *tq_head;
+ struct obj_header *obj_head;
+ DB_LOCKOBJ *op;
+ DB_LOCKREGION *lrp;
+ u_int maxlocks;
+ u_int32_t i;
+ int fd, lock_modes, nelements, ret;
+ u_int8_t *conflicts, *curaddr;
+
+ maxlocks = dbenv == NULL || dbenv->lk_max == 0 ?
+ DB_LOCK_DEFAULT_N : dbenv->lk_max;
+ lock_modes = dbenv == NULL || dbenv->lk_modes == 0 ?
+ DB_LOCK_RW_N : dbenv->lk_modes;
+ conflicts = dbenv == NULL || dbenv->lk_conflicts == NULL ?
+ (u_int8_t *)db_rw_conflicts : dbenv->lk_conflicts;
+
+ if ((ret =
+ __db_rcreate(dbenv, DB_APP_NONE, path, DB_DEFAULT_LOCK_FILE, mode,
+ LOCK_REGION_SIZE(lock_modes, maxlocks, __db_tablesize(maxlocks)),
+ &fd, &lrp)) != 0)
+ return (ret);
+
+ /* Region exists; now initialize it. */
+ lrp->table_size = __db_tablesize(maxlocks);
+ lrp->magic = DB_LOCKMAGIC;
+ lrp->version = DB_LOCKVERSION;
+ lrp->id = 0;
+ lrp->maxlocks = maxlocks;
+ lrp->need_dd = 0;
+ lrp->detect = DB_LOCK_NORUN;
+ lrp->numobjs = maxlocks;
+ lrp->nlockers = 0;
+ lrp->mem_bytes = ALIGN(STRING_SIZE(maxlocks), sizeof(size_t));
+ lrp->increment = lrp->hdr.size / 2;
+ lrp->nmodes = lock_modes;
+ lrp->nconflicts = 0;
+ lrp->nrequests = 0;
+ lrp->nreleases = 0;
+ lrp->ndeadlocks = 0;
+
+ /*
+ * As we write the region, we've got to maintain the alignment
+ * for the structures that follow each chunk. This information
+ * ends up being encapsulated both in here as well as in the
+ * lock.h file for the XXX_SIZE macros.
+ */
+ /* Initialize conflict matrix. */
+ curaddr = (u_int8_t *)lrp + sizeof(DB_LOCKREGION);
+ memcpy(curaddr, conflicts, lock_modes * lock_modes);
+ curaddr += lock_modes * lock_modes;
+
+ /*
+ * Initialize hash table.
+ */
+ curaddr = (u_int8_t *)ALIGNP(curaddr, LOCK_HASH_ALIGN);
+ lrp->hash_off = curaddr - (u_int8_t *)lrp;
+ nelements = lrp->table_size;
+ __db_hashinit(curaddr, nelements);
+ curaddr += nelements * sizeof(DB_HASHTAB);
+
+ /*
+ * Initialize locks onto a free list. Since locks contains mutexes,
+ * we need to make sure that each lock is aligned on a MUTEX_ALIGNMENT
+ * boundary.
+ */
+ curaddr = (u_int8_t *)ALIGNP(curaddr, MUTEX_ALIGNMENT);
+ tq_head = &lrp->free_locks;
+ SH_TAILQ_INIT(tq_head);
+
+ for (i = 0; i++ < maxlocks;
+ curaddr += ALIGN(sizeof(struct __db_lock), MUTEX_ALIGNMENT)) {
+ lp = (struct __db_lock *)curaddr;
+ lp->status = DB_LSTAT_FREE;
+ SH_TAILQ_INSERT_HEAD(tq_head, lp, links, __db_lock);
+ }
+
+ /* Initialize objects onto a free list. */
+ obj_head = &lrp->free_objs;
+ SH_TAILQ_INIT(obj_head);
+
+ for (i = 0; i++ < maxlocks; curaddr += sizeof(DB_LOCKOBJ)) {
+ op = (DB_LOCKOBJ *)curaddr;
+ SH_TAILQ_INSERT_HEAD(obj_head, op, links, __db_lockobj);
+ }
+
+ /*
+ * Initialize the string space; as for all shared memory allocation
+ * regions, this requires size_t alignment, since we store the
+ * lengths of malloc'd areas in the area..
+ */
+ curaddr = (u_int8_t *)ALIGNP(curaddr, sizeof(size_t));
+ lrp->mem_off = curaddr - (u_int8_t *)lrp;
+ __db_shalloc_init(curaddr, lrp->mem_bytes);
+
+ /* Release the lock. */
+ (void)__db_mutex_unlock(&lrp->hdr.lock, fd);
+
+ /* Now unmap the region. */
+ if ((ret = __db_rclose(dbenv, fd, lrp)) != 0) {
+ (void)lock_unlink(path, 1 /* force */, dbenv);
+ return (ret);
+ }
+
+ return (0);
+}
+
+int
+lock_open(path, flags, mode, dbenv, ltp)
+ const char *path;
+ int flags, mode;
+ DB_ENV *dbenv;
+ DB_LOCKTAB **ltp;
+{
+ DB_LOCKTAB *lt;
+ int ret, retry_cnt;
+
+ /* Validate arguments. */
+#ifdef HAVE_SPINLOCKS
+#define OKFLAGS (DB_CREATE | DB_THREAD)
+#else
+#define OKFLAGS (DB_CREATE)
+#endif
+ if ((ret = __db_fchk(dbenv, "lock_open", flags, OKFLAGS)) != 0)
+ return (ret);
+
+ /*
+ * Create the lock table structure.
+ */
+ if ((lt = (DB_LOCKTAB *)calloc(1, sizeof(DB_LOCKTAB))) == NULL) {
+ __db_err(dbenv, "%s", strerror(errno));
+ return (ENOMEM);
+ }
+ lt->dbenv = dbenv;
+
+ /*
+ * Now, create the lock region if it doesn't already exist.
+ */
+ retry_cnt = 0;
+retry: if (LF_ISSET(DB_CREATE) &&
+ (ret = __lock_create(path, mode, dbenv)) != 0)
+ if (ret == EAGAIN && ++retry_cnt < 3) {
+ (void)__db_sleep(1, 0);
+ goto retry;
+ } else if (ret == EEXIST) /* We did not create the region */
+ LF_CLR(DB_CREATE);
+ else
+ goto out;
+
+ /*
+ * Finally, open the region, map it in, and increment the
+ * reference count.
+ */
+ retry_cnt = 0;
+retry1: if ((ret = __db_ropen(dbenv, DB_APP_NONE, path, DB_DEFAULT_LOCK_FILE,
+ LF_ISSET(~(DB_CREATE | DB_THREAD)), &lt->fd, &lt->region)) != 0) {
+ if (ret == EAGAIN && ++retry_cnt < 3) {
+ (void)__db_sleep(1, 0);
+ goto retry1;
+ }
+ goto out;
+ }
+
+ if (lt->region->magic != DB_LOCKMAGIC) {
+ __db_err(dbenv, "lock_open: Bad magic number");
+ ret = EINVAL;
+ goto out;
+ }
+
+ /* Check for automatic deadlock detection. */
+ if (dbenv->lk_detect != DB_LOCK_NORUN) {
+ if (lt->region->detect != DB_LOCK_NORUN &&
+ dbenv->lk_detect != DB_LOCK_DEFAULT &&
+ lt->region->detect != dbenv->lk_detect) {
+ __db_err(dbenv,
+ "lock_open: incompatible deadlock detector mode");
+ ret = EINVAL;
+ goto out;
+ }
+ if (lt->region->detect == DB_LOCK_NORUN)
+ lt->region->detect = dbenv->lk_detect;
+ }
+
+ /* Set up remaining pointers into region. */
+ lt->conflicts = (u_int8_t *)lt->region + sizeof(DB_LOCKREGION);
+ lt->hashtab =
+ (DB_HASHTAB *)((u_int8_t *)lt->region + lt->region->hash_off);
+ lt->mem = (void *)((u_int8_t *)lt->region + lt->region->mem_off);
+ lt->reg_size = lt->region->hdr.size;
+
+ *ltp = lt;
+ return (0);
+
+/* Error handling. */
+out: if (lt->region != NULL)
+ (void)__db_rclose(lt->dbenv, lt->fd, lt->region);
+ if (LF_ISSET(DB_CREATE))
+ (void)lock_unlink(path, 1, lt->dbenv);
+ free(lt);
+ return (ret);
+}
+
+int
+lock_id (lt, idp)
+ DB_LOCKTAB *lt;
+ u_int32_t *idp;
+{
+ u_int32_t id;
+
+ LOCK_LOCKREGION(lt);
+ if (lt->region->id >= DB_LOCK_MAXID)
+ lt->region->id = 0;
+ id = ++lt->region->id;
+ UNLOCK_LOCKREGION(lt);
+
+ *idp = id;
+ return (0);
+}
+
+int
+lock_vec(lt, locker, flags, list, nlist, elistp)
+ DB_LOCKTAB *lt;
+ u_int32_t locker;
+ int flags, nlist;
+ DB_LOCKREQ *list, **elistp;
+{
+ struct __db_lock *lp;
+ DB_LOCKOBJ *sh_obj, *sh_locker;
+ int i, ret, run_dd;
+
+ /* Validate arguments. */
+ if ((ret =
+ __db_fchk(lt->dbenv, "lock_vec", flags, DB_LOCK_NOWAIT)) != 0)
+ return (ret);
+
+ LOCK_LOCKREGION(lt);
+
+ if ((ret = __lock_validate_region(lt)) != 0) {
+ UNLOCK_LOCKREGION(lt);
+ return (ret);
+ }
+
+ ret = 0;
+ for (i = 0; i < nlist && ret == 0; i++) {
+ switch (list[i].op) {
+ case DB_LOCK_GET:
+ ret = __lock_get_internal(lt, locker, flags,
+ list[i].obj, list[i].mode, &lp);
+ if (ret == 0)
+ list[i].lock = LOCK_TO_OFFSET(lt, lp);
+ break;
+ case DB_LOCK_PUT:
+ lp = OFFSET_TO_LOCK(lt, list[i].lock);
+ if (lp->holder != locker) {
+ ret = DB_LOCK_NOTHELD;
+ break;
+ }
+ list[i].mode = lp->mode;
+
+ /* XXX Need to copy the object. ??? */
+ ret = __lock_put_internal(lt, lp, 0);
+ break;
+ case DB_LOCK_PUT_ALL:
+ /* Find the locker. */
+ if ((ret = __lock_getobj(lt, locker,
+ NULL, DB_LOCK_LOCKER, &sh_locker)) != 0)
+ break;
+
+ for (lp = SH_LIST_FIRST(&sh_locker->heldby, __db_lock);
+ lp != NULL;
+ lp = SH_LIST_FIRST(&sh_locker->heldby, __db_lock)) {
+ if ((ret = __lock_put_internal(lt, lp, 0)) != 0)
+ break;
+ }
+ __lock_freeobj(lt, sh_locker);
+ lt->region->nlockers--;
+ break;
+ case DB_LOCK_PUT_OBJ:
+
+ /* Look up the object in the hash table. */
+ __db_hashlookup(lt->hashtab, __db_lockobj, links,
+ list[i].obj, sh_obj, lt->region->table_size,
+ __lock_ohash, __lock_cmp);
+ if (sh_obj == NULL) {
+ ret = EINVAL;
+ break;
+ }
+ /*
+ * Release waiters first, because they won't cause
+ * anyone else to be awakened. If we release the
+ * lockers first, all the waiters get awakened
+ * needlessly.
+ */
+ for (lp = SH_TAILQ_FIRST(&sh_obj->waiters, __db_lock);
+ lp != NULL;
+ lp = SH_TAILQ_FIRST(&sh_obj->waiters, __db_lock)) {
+ lt->region->nreleases += lp->refcount;
+ __lock_remove_waiter(lt, sh_obj, lp,
+ DB_LSTAT_NOGRANT);
+ __lock_checklocker(lt, lp, 1);
+ }
+
+ for (lp = SH_TAILQ_FIRST(&sh_obj->holders, __db_lock);
+ lp != NULL;
+ lp = SH_TAILQ_FIRST(&sh_obj->holders, __db_lock)) {
+
+ lt->region->nreleases += lp->refcount;
+ SH_LIST_REMOVE(lp, locker_links, __db_lock);
+ SH_TAILQ_REMOVE(&sh_obj->holders, lp, links,
+ __db_lock);
+ lp->status = DB_LSTAT_FREE;
+ SH_TAILQ_INSERT_HEAD(&lt->region->free_locks,
+ lp, links, __db_lock);
+ }
+
+ /* Now free the object. */
+ __lock_freeobj(lt, sh_obj);
+ break;
+#ifdef DEBUG
+ case DB_LOCK_DUMP:
+ /* Find the locker. */
+ if ((ret = __lock_getobj(lt, locker,
+ NULL, DB_LOCK_LOCKER, &sh_locker)) != 0)
+ break;
+
+ for (lp = SH_LIST_FIRST(&sh_locker->heldby, __db_lock);
+ lp != NULL;
+ lp = SH_LIST_NEXT(lp, locker_links, __db_lock)) {
+ __lock_printlock(lt, lp, 1);
+ ret = EINVAL;
+ }
+ if (ret == 0) {
+ __lock_freeobj(lt, sh_locker);
+ lt->region->nlockers--;
+ }
+ break;
+#endif
+ default:
+ ret = EINVAL;
+ break;
+ }
+ }
+
+ if (lt->region->need_dd && lt->region->detect != DB_LOCK_NORUN) {
+ run_dd = 1;
+ lt->region->need_dd = 0;
+ } else
+ run_dd = 0;
+
+ UNLOCK_LOCKREGION(lt);
+
+ if (ret == 0 && run_dd)
+ lock_detect(lt, 0, lt->region->detect);
+
+ if (elistp && ret != 0)
+ *elistp = &list[i - 1];
+ return (ret);
+}
+
+int
+lock_get(lt, locker, flags, obj, lock_mode, lock)
+ DB_LOCKTAB *lt;
+ u_int32_t locker;
+ int flags;
+ const DBT *obj;
+ db_lockmode_t lock_mode;
+ DB_LOCK *lock;
+{
+ struct __db_lock *lockp;
+ int ret;
+
+ /* Validate arguments. */
+ if ((ret =
+ __db_fchk(lt->dbenv, "lock_get", flags, DB_LOCK_NOWAIT)) != 0)
+ return (ret);
+
+ LOCK_LOCKREGION(lt);
+
+ ret = __lock_validate_region(lt);
+ if (ret == 0 && (ret = __lock_get_internal(lt,
+ locker, flags, obj, lock_mode, &lockp)) == 0) {
+ *lock = LOCK_TO_OFFSET(lt, lockp);
+ lt->region->nrequests++;
+ }
+
+ UNLOCK_LOCKREGION(lt);
+ return (ret);
+}
+
+int
+lock_put(lt, lock)
+ DB_LOCKTAB *lt;
+ DB_LOCK lock;
+{
+ struct __db_lock *lockp;
+ int ret, run_dd;
+
+ LOCK_LOCKREGION(lt);
+
+ if ((ret = __lock_validate_region(lt)) != 0)
+ return (ret);
+ else {
+ lockp = OFFSET_TO_LOCK(lt, lock);
+ ret = __lock_put_internal(lt, lockp, 0);
+ }
+
+ __lock_checklocker(lt, lockp, 0);
+
+ if (lt->region->need_dd && lt->region->detect != DB_LOCK_NORUN) {
+ run_dd = 1;
+ lt->region->need_dd = 0;
+ } else
+ run_dd = 0;
+
+ UNLOCK_LOCKREGION(lt);
+
+ if (ret == 0 && run_dd)
+ lock_detect(lt, 0, lt->region->detect);
+
+ return (ret);
+}
+
+int
+lock_close(lt)
+ DB_LOCKTAB *lt;
+{
+ int ret;
+
+ if ((ret = __db_rclose(lt->dbenv, lt->fd, lt->region)) != 0)
+ return (ret);
+
+ /* Free lock table. */
+ free(lt);
+ return (0);
+}
+
+int
+lock_unlink(path, force, dbenv)
+ const char *path;
+ int force;
+ DB_ENV *dbenv;
+{
+ return (__db_runlink(dbenv,
+ DB_APP_NONE, path, DB_DEFAULT_LOCK_FILE, force));
+}
+
+/*
+ * XXX This looks like it could be void, but I'm leaving it returning
+ * an int because I think it will have to when we go through and add
+ * the appropriate error checking for the EINTR on mutexes.
+ */
+static int
+__lock_put_internal(lt, lockp, do_all)
+ DB_LOCKTAB *lt;
+ struct __db_lock *lockp;
+ int do_all;
+{
+ struct __db_lock *lp_w, *lp_h, *next_waiter;
+ DB_LOCKOBJ *sh_obj;
+ int state_changed;
+
+ if (lockp->refcount == 0 || (lockp->status != DB_LSTAT_HELD &&
+ lockp->status != DB_LSTAT_WAITING) || lockp->obj == 0) {
+ __db_err(lt->dbenv, "lock_put: invalid lock %lu",
+ (u_long)((u_int8_t *)lockp - (u_int8_t *)lt->region));
+ return (EINVAL);
+ }
+
+ if (do_all)
+ lt->region->nreleases += lockp->refcount;
+ else
+ lt->region->nreleases++;
+ if (do_all == 0 && lockp->refcount > 1) {
+ lockp->refcount--;
+ return (0);
+ }
+
+ /* Get the object associated with this lock. */
+ sh_obj = (DB_LOCKOBJ *)((u_int8_t *)lockp + lockp->obj);
+
+ /* Remove lock from locker list. */
+ SH_LIST_REMOVE(lockp, locker_links, __db_lock);
+
+ /* Remove this lock from its holders/waitlist. */
+ if (lockp->status != DB_LSTAT_HELD)
+ __lock_remove_waiter(lt, sh_obj, lockp, DB_LSTAT_FREE);
+ else
+ SH_TAILQ_REMOVE(&sh_obj->holders, lockp, links, __db_lock);
+
+ /*
+ * We need to do lock promotion. We also need to determine if
+ * we're going to need to run the deadlock detector again. If
+ * we release locks, and there are waiters, but no one gets promoted,
+ * then we haven't fundamentally changed the lockmgr state, so
+ * we may still have a deadlock and we have to run again. However,
+ * if there were no waiters, or we actually promoted someone, then
+ * we are OK and we don't have to run it immediately.
+ */
+ for (lp_w = SH_TAILQ_FIRST(&sh_obj->waiters, __db_lock),
+ state_changed = lp_w == NULL;
+ lp_w != NULL;
+ lp_w = next_waiter) {
+ next_waiter = SH_TAILQ_NEXT(lp_w, links, __db_lock);
+ for (lp_h = SH_TAILQ_FIRST(&sh_obj->holders, __db_lock);
+ lp_h != NULL;
+ lp_h = SH_TAILQ_NEXT(lp_h, links, __db_lock)) {
+ if (CONFLICTS(lt, lp_h->mode, lp_w->mode) &&
+ lp_h->holder != lp_w->holder)
+ break;
+ }
+ if (lp_h != NULL) /* Found a conflict. */
+ break;
+
+ /* No conflict, promote the waiting lock. */
+ SH_TAILQ_REMOVE(&sh_obj->waiters, lp_w, links, __db_lock);
+ lp_w->status = DB_LSTAT_PENDING;
+ SH_TAILQ_INSERT_TAIL(&sh_obj->holders, lp_w, links);
+
+ /* Wake up waiter. */
+ (void)__db_mutex_unlock(&lp_w->mutex, lt->fd);
+ state_changed = 1;
+ }
+
+ /* Check if object should be reclaimed. */
+ if (SH_TAILQ_FIRST(&sh_obj->holders, __db_lock) == NULL) {
+ __db_hashremove_el(lt->hashtab, __db_lockobj, links, sh_obj,
+ lt->region->table_size, __lock_lhash);
+ __db_shalloc_free(lt->mem, SH_DBT_PTR(&sh_obj->lockobj));
+ SH_TAILQ_INSERT_HEAD(&lt->region->free_objs, sh_obj, links,
+ __db_lockobj);
+ state_changed = 1;
+ }
+
+ /* Free lock. */
+ lockp->status = DB_LSTAT_FREE;
+ SH_TAILQ_INSERT_HEAD(&lt->region->free_locks, lockp, links, __db_lock);
+
+ /*
+ * If we did not promote anyone; we need to run the deadlock
+ * detector again.
+ */
+ if (state_changed == 0)
+ lt->region->need_dd = 1;
+
+ return (0);
+}
+
+static int
+__lock_get_internal(lt, locker, flags, obj, lock_mode, lockp)
+ DB_LOCKTAB *lt;
+ u_int32_t locker;
+ int flags;
+ const DBT *obj;
+ db_lockmode_t lock_mode;
+ struct __db_lock **lockp;
+{
+ struct __db_lock *newl, *lp;
+ DB_LOCKOBJ *sh_obj, *sh_locker;
+ DB_LOCKREGION *lrp;
+ size_t newl_off;
+ int ret;
+
+ ret = 0;
+ /*
+ * Check that lock mode is valid.
+ */
+
+ lrp = lt->region;
+ if ((u_int32_t)lock_mode >= lrp->nmodes) {
+ __db_err(lt->dbenv,
+ "lock_get: invalid lock mode %lu\n", (u_long)lock_mode);
+ return (EINVAL);
+ }
+
+ /* Allocate a new lock. Optimize for the common case of a grant. */
+ if ((newl = SH_TAILQ_FIRST(&lrp->free_locks, __db_lock)) == NULL) {
+ if ((ret = __lock_grow_region(lt, DB_LOCK_LOCK, 0)) != 0)
+ return (ret);
+ lrp = lt->region;
+ newl = SH_TAILQ_FIRST(&lrp->free_locks, __db_lock);
+ }
+ newl_off = LOCK_TO_OFFSET(lt, newl);
+
+ /* Optimize for common case of granting a lock. */
+ SH_TAILQ_REMOVE(&lrp->free_locks, newl, links, __db_lock);
+
+ newl->mode = lock_mode;
+ newl->status = DB_LSTAT_HELD;
+ newl->holder = locker;
+ newl->refcount = 1;
+
+ if ((ret =
+ __lock_getobj(lt, 0, (DBT *)obj, DB_LOCK_OBJTYPE, &sh_obj)) != 0)
+ return (ret);
+
+ lrp = lt->region; /* getobj might have grown */
+ newl = OFFSET_TO_LOCK(lt, newl_off);
+
+ /* Now make new lock point to object */
+ newl->obj = SH_PTR_TO_OFF(newl, sh_obj);
+
+ /*
+ * Now we have a lock and an object and we need to see if we should
+ * grant the lock. We use a FIFO ordering so we can only grant a
+ * new lock if it does not conflict with anyone on the holders list
+ * OR anyone on the waiters list. In case of conflict, we put the
+ * new lock on the end of the waiters list.
+ */
+ for (lp = SH_TAILQ_FIRST(&sh_obj->holders, __db_lock);
+ lp != NULL;
+ lp = SH_TAILQ_NEXT(lp, links, __db_lock)) {
+ if (CONFLICTS(lt, lp->mode, lock_mode) &&
+ locker != lp->holder)
+ break;
+ else if (lp->holder == locker && lp->mode == lock_mode &&
+ lp->status == DB_LSTAT_HELD) {
+ /* Lock is already held, just inc the ref count. */
+ lp->refcount++;
+ SH_TAILQ_INSERT_HEAD(&lrp->free_locks, newl, links,
+ __db_lock);
+ *lockp = lp;
+ return (0);
+ }
+ }
+
+ if (lp == NULL)
+ for (lp = SH_TAILQ_FIRST(&sh_obj->waiters, __db_lock);
+ lp != NULL;
+ lp = SH_TAILQ_NEXT(lp, links, __db_lock)) {
+ if (CONFLICTS(lt, lp->mode, lock_mode) &&
+ locker != lp->holder)
+ break;
+ }
+ if (lp == NULL)
+ SH_TAILQ_INSERT_TAIL(&sh_obj->holders, newl, links);
+ else if (!(flags & DB_LOCK_NOWAIT))
+ SH_TAILQ_INSERT_TAIL(&sh_obj->waiters, newl, links);
+ else {
+ /* Free the lock and return an error. */
+ newl->status = DB_LSTAT_FREE;
+ SH_TAILQ_INSERT_HEAD(&lrp->free_locks, newl, links, __db_lock);
+ return (DB_LOCK_NOTGRANTED);
+ }
+
+ /*
+ * This is really a blocker for the process, so initialize it
+ * set. That way the current process will block when it tries
+ * to get it and the waking process will release it.
+ */
+ (void)__db_mutex_init(&newl->mutex,
+ MUTEX_LOCK_OFFSET(lt->region, &newl->mutex));
+ (void)__db_mutex_lock(&newl->mutex, lt->fd,
+ lt->dbenv == NULL ? NULL : lt->dbenv->db_yield);
+
+ /*
+ * Now, insert the lock onto its locker's list.
+ */
+ if ((ret =
+ __lock_getobj(lt, locker, NULL, DB_LOCK_LOCKER, &sh_locker)) != 0)
+ return (ret);
+
+ lrp = lt->region;
+ SH_LIST_INSERT_HEAD(&sh_locker->heldby, newl, locker_links, __db_lock);
+
+ if (lp != NULL) {
+ newl->status = DB_LSTAT_WAITING;
+ lrp->nconflicts++;
+ /*
+ * We are about to wait; must release the region mutex.
+ * Then, when we wakeup, we need to reacquire the region
+ * mutex before continuing.
+ */
+ if (lrp->detect == DB_LOCK_NORUN)
+ lt->region->need_dd = 1;
+ UNLOCK_LOCKREGION(lt);
+
+ /*
+ * We are about to wait; before waiting, see if the deadlock
+ * detector should be run.
+ */
+ if (lrp->detect != DB_LOCK_NORUN)
+ ret = lock_detect(lt, 0, lrp->detect);
+
+ (void)__db_mutex_lock(&newl->mutex,
+ lt->fd, lt->dbenv == NULL ? NULL : lt->dbenv->db_yield);
+
+ LOCK_LOCKREGION(lt);
+ if (newl->status != DB_LSTAT_PENDING) {
+ /* Return to free list. */
+ __lock_checklocker(lt, newl, 0);
+ SH_TAILQ_INSERT_HEAD(&lrp->free_locks, newl, links,
+ __db_lock);
+ switch (newl->status) {
+ case DB_LSTAT_ABORTED:
+ ret = DB_LOCK_DEADLOCK;
+ break;
+ case DB_LSTAT_NOGRANT:
+ ret = DB_LOCK_NOTGRANTED;
+ break;
+ default:
+ ret = EINVAL;
+ break;
+ }
+ newl->status = DB_LSTAT_FREE;
+ newl = NULL;
+ } else
+ newl->status = DB_LSTAT_HELD;
+ }
+
+ *lockp = newl;
+ return (ret);
+}
+
+/*
+ * This is called at every interface to verify if the region
+ * has changed size, and if so, to remap the region in and
+ * reset the process pointers.
+ */
+static int
+__lock_validate_region(lt)
+ DB_LOCKTAB *lt;
+{
+ int ret;
+
+ if (lt->reg_size == lt->region->hdr.size)
+ return (0);
+
+ /* Grow the region. */
+ if ((ret = __db_rremap(lt->dbenv, lt->region,
+ lt->reg_size, lt->region->hdr.size, lt->fd, &lt->region)) != 0)
+ return (ret);
+
+ __lock_reset_region(lt);
+
+ return (0);
+}
+
+/*
+ * We have run out of space; time to grow the region.
+ */
+static int
+__lock_grow_region(lt, which, howmuch)
+ DB_LOCKTAB *lt;
+ int which;
+ size_t howmuch;
+{
+ struct __db_lock *newl;
+ struct lock_header *lock_head;
+ struct obj_header *obj_head;
+ DB_LOCKOBJ *op;
+ DB_LOCKREGION *lrp;
+ float lock_ratio, obj_ratio;
+ size_t incr, oldsize, used;
+ u_int32_t i, newlocks, newmem, newobjs;
+ int ret, usedlocks, usedmem, usedobjs;
+ u_int8_t *curaddr;
+
+ lrp = lt->region;
+ oldsize = lrp->hdr.size;
+ incr = lrp->increment;
+
+ /* Figure out how much of each sort of space we have. */
+ usedmem = lrp->mem_bytes - __db_shalloc_count(lt->mem);
+ usedobjs = lrp->numobjs - __lock_count_objs(lrp);
+ usedlocks = lrp->maxlocks - __lock_count_locks(lrp);
+
+ /*
+ * Figure out what fraction of the used space belongs to each
+ * different type of "thing" in the region. Then partition the
+ * new space up according to this ratio.
+ */
+ used = usedmem +
+ usedlocks * ALIGN(sizeof(struct __db_lock), MUTEX_ALIGNMENT) +
+ usedobjs * sizeof(DB_LOCKOBJ);
+
+ lock_ratio = usedlocks *
+ ALIGN(sizeof(struct __db_lock), MUTEX_ALIGNMENT) / (float)used;
+ obj_ratio = usedobjs * sizeof(DB_LOCKOBJ) / (float)used;
+
+ newlocks = (u_int32_t)(lock_ratio *
+ incr / ALIGN(sizeof(struct __db_lock), MUTEX_ALIGNMENT));
+ newobjs = (u_int32_t)(obj_ratio * incr / sizeof(DB_LOCKOBJ));
+ newmem = incr -
+ (newobjs * sizeof(DB_LOCKOBJ) +
+ newlocks * ALIGN(sizeof(struct __db_lock), MUTEX_ALIGNMENT));
+
+ /*
+ * Make sure we allocate enough memory for the object being
+ * requested.
+ */
+ switch (which) {
+ case DB_LOCK_LOCK:
+ if (newlocks == 0) {
+ newlocks = 10;
+ incr += newlocks * sizeof(struct __db_lock);
+ }
+ break;
+ case DB_LOCK_OBJ:
+ if (newobjs == 0) {
+ newobjs = 10;
+ incr += newobjs * sizeof(DB_LOCKOBJ);
+ }
+ break;
+ case DB_LOCK_MEM:
+ if (newmem < howmuch * 2) {
+ incr += howmuch * 2 - newmem;
+ newmem = howmuch * 2;
+ }
+ break;
+ }
+
+ newmem += ALIGN(incr, sizeof(size_t)) - incr;
+ incr = ALIGN(incr, sizeof(size_t));
+
+ /*
+ * Since we are going to be allocating locks at the beginning of the
+ * new chunk, we need to make sure that the chunk is MUTEX_ALIGNMENT
+ * aligned. We did not guarantee this when we created the region, so
+ * we may need to pad the old region by extra bytes to ensure this
+ * alignment.
+ */
+ incr += ALIGN(oldsize, MUTEX_ALIGNMENT) - oldsize;
+
+ __db_err(lt->dbenv,
+ "Growing lock region: %lu locks %lu objs %lu bytes",
+ (u_long)newlocks, (u_long)newobjs, (u_long)newmem);
+
+ if ((ret = __db_rgrow(lt->dbenv, lt->fd, incr)) != 0)
+ return (ret);
+ if ((ret = __db_rremap(lt->dbenv,
+ lt->region, oldsize, oldsize + incr, lt->fd, &lt->region)) != 0)
+ return (ret);
+ __lock_reset_region(lt);
+
+ /* Update region parameters. */
+ lrp = lt->region;
+ lrp->increment = incr << 1;
+ lrp->maxlocks += newlocks;
+ lrp->numobjs += newobjs;
+ lrp->mem_bytes += newmem;
+
+ curaddr = (u_int8_t *)lrp + oldsize;
+ curaddr = (u_int8_t *)ALIGNP(curaddr, MUTEX_ALIGNMENT);
+
+ /* Put new locks onto the free list. */
+ lock_head = &lrp->free_locks;
+ for (i = 0; i++ < newlocks;
+ curaddr += ALIGN(sizeof(struct __db_lock), MUTEX_ALIGNMENT)) {
+ newl = (struct __db_lock *)curaddr;
+ SH_TAILQ_INSERT_HEAD(lock_head, newl, links, __db_lock);
+ }
+
+ /* Put new objects onto the free list. */
+ obj_head = &lrp->free_objs;
+ for (i = 0; i++ < newobjs; curaddr += sizeof(DB_LOCKOBJ)) {
+ op = (DB_LOCKOBJ *)curaddr;
+ SH_TAILQ_INSERT_HEAD(obj_head, op, links, __db_lockobj);
+ }
+
+ *((size_t *)curaddr) = newmem - sizeof(size_t);
+ curaddr += sizeof(size_t);
+ __db_shalloc_free(lt->mem, curaddr);
+
+ return (0);
+}
+
+#ifdef DEBUG
+void
+__lock_dump_region(lt, flags)
+ DB_LOCKTAB *lt;
+ unsigned long flags;
+{
+ struct __db_lock *lp;
+ DB_LOCKOBJ *op;
+ DB_LOCKREGION *lrp;
+ u_int32_t i, j;
+
+ lrp = lt->region;
+
+ printf("Lock region parameters\n");
+ printf("%s:0x%x\t%s:%lu\t%s:%lu\t%s:%lu\n%s:%lu\t%s:%lu\t%s:%lu\t\n",
+ "magic ", lrp->magic,
+ "version ", (u_long)lrp->version,
+ "processes ", (u_long)lrp->hdr.refcnt,
+ "maxlocks ", (u_long)lrp->maxlocks,
+ "table size ", (u_long)lrp->table_size,
+ "nmodes ", (u_long)lrp->nmodes,
+ "numobjs ", (u_long)lrp->numobjs);
+ printf("%s:%lu\t%s:%lu\t%s:%lu\n%s:%lu\t%s:%lu\t%s:%lu\n",
+ "size ", (u_long)lrp->hdr.size,
+ "nlockers ", (u_long)lrp->nlockers,
+ "hash_off ", (u_long)lrp->hash_off,
+ "increment ", (u_long)lrp->increment,
+ "mem_off ", (u_long)lrp->mem_off,
+ "mem_bytes ", (u_long)lrp->mem_bytes);
+#ifndef HAVE_SPINLOCKS
+ printf("Mutex: off %lu", (u_long)lrp->hdr.lock.off);
+#endif
+#ifdef MUTEX_STATISTICS
+ printf(" waits %lu nowaits %lu",
+ (u_long)lrp->hdr.lock.mutex_set_wait,
+ (u_long)lrp->hdr.lock.mutex_set_nowait);
+#endif
+ printf("\n%s:%lu\t%s:%lu\t%s:%lu\t%s:%lu\n",
+ "nconflicts ", (u_long)lrp->nconflicts,
+ "nrequests ", (u_long)lrp->nrequests,
+ "nreleases ", (u_long)lrp->nreleases,
+ "ndeadlocks ", (u_long)lrp->ndeadlocks);
+ printf("need_dd %lu\n", (u_long)lrp->need_dd);
+ if (flags & LOCK_DEBUG_CONF) {
+ printf("\nConflict matrix\n");
+
+ for (i = 0; i < lrp->nmodes; i++) {
+ for (j = 0; j < lrp->nmodes; j++)
+ printf("%lu\t",
+ (u_long)lt->conflicts[i * lrp->nmodes + j]);
+ printf("\n");
+ }
+ }
+
+ for (i = 0; i < lrp->table_size; i++) {
+ op = SH_TAILQ_FIRST(&lt->hashtab[i], __db_lockobj);
+ if (op != NULL && flags & LOCK_DEBUG_BUCKET)
+ printf("Bucket %lu:\n", (unsigned long)i);
+ while (op != NULL) {
+ if (op->type == DB_LOCK_LOCKER &&
+ flags & LOCK_DEBUG_LOCKERS)
+ __lock_dump_locker(lt, op);
+ else if (flags & LOCK_DEBUG_OBJECTS &&
+ op->type == DB_LOCK_OBJTYPE)
+ __lock_dump_object(lt, op);
+ op = SH_TAILQ_NEXT(op, links, __db_lockobj);
+ }
+ }
+
+ if (flags & LOCK_DEBUG_LOCK) {
+ printf("\nLock Free List\n");
+ for (lp = SH_TAILQ_FIRST(&lrp->free_locks, __db_lock);
+ lp != NULL;
+ lp = SH_TAILQ_NEXT(lp, links, __db_lock)) {
+ printf("0x%x: %lu\t%lu\t%lu\t0x%x\n", (u_int)lp,
+ (u_long)lp->holder, (u_long)lp->mode,
+ (u_long)lp->status, (u_int)lp->obj);
+ }
+ }
+
+ if (flags & LOCK_DEBUG_LOCK) {
+ printf("\nObject Free List\n");
+ for (op = SH_TAILQ_FIRST(&lrp->free_objs, __db_lockobj);
+ op != NULL;
+ op = SH_TAILQ_NEXT(op, links, __db_lockobj))
+ printf("0x%x\n", (u_int)op);
+ }
+
+ if (flags & LOCK_DEBUG_MEM) {
+ printf("\nMemory Free List\n");
+ __db_shalloc_dump(stdout, lt->mem);
+ }
+}
+
+static void
+__lock_dump_locker(lt, op)
+ DB_LOCKTAB *lt;
+ DB_LOCKOBJ *op;
+{
+ struct __db_lock *lp;
+ u_int32_t locker;
+ void *ptr;
+
+ ptr = SH_DBT_PTR(&op->lockobj);
+ memcpy(&locker, ptr, sizeof(u_int32_t));
+ printf("L %lu", (u_long)locker);
+
+ lp = SH_LIST_FIRST(&op->heldby, __db_lock);
+ if (lp == NULL) {
+ printf("\n");
+ return;
+ }
+ for (; lp != NULL; lp = SH_LIST_NEXT(lp, locker_links, __db_lock))
+ __lock_printlock(lt, lp, 0);
+}
+
+static void
+__lock_dump_object(lt, op)
+ DB_LOCKTAB *lt;
+ DB_LOCKOBJ *op;
+{
+ struct __db_lock *lp;
+ u_int32_t j;
+ char *ptr;
+
+ ptr = SH_DBT_PTR(&op->lockobj);
+ for (j = 0; j < op->lockobj.size; ptr++, j++)
+ printf("%c", (int)*ptr);
+ printf("\n");
+
+ printf("H:");
+ for (lp =
+ SH_TAILQ_FIRST(&op->holders, __db_lock);
+ lp != NULL;
+ lp = SH_TAILQ_NEXT(lp, links, __db_lock))
+ __lock_printlock(lt, lp, 0);
+ lp = SH_TAILQ_FIRST(&op->waiters, __db_lock);
+ if (lp != NULL) {
+ printf("\nW:");
+ for (; lp != NULL; lp = SH_TAILQ_NEXT(lp, links, __db_lock))
+ __lock_printlock(lt, lp, 0);
+ }
+}
+
+int
+__lock_is_locked(lt, locker, dbt, mode)
+ DB_LOCKTAB *lt;
+ u_int32_t locker;
+ DBT *dbt;
+ db_lockmode_t mode;
+{
+ struct __db_lock *lp;
+ DB_LOCKOBJ *sh_obj;
+ DB_LOCKREGION *lrp;
+
+ lrp = lt->region;
+
+ /* Look up the object in the hash table. */
+ __db_hashlookup(lt->hashtab, __db_lockobj, links,
+ dbt, sh_obj, lrp->table_size, __lock_ohash, __lock_cmp);
+ if (sh_obj == NULL)
+ return (0);
+
+ for (lp = SH_TAILQ_FIRST(&sh_obj->holders, __db_lock);
+ lp != NULL;
+ lp = SH_TAILQ_FIRST(&sh_obj->holders, __db_lock)) {
+ if (lp->holder == locker && lp->mode == mode)
+ return (1);
+ }
+
+ return (0);
+}
+
+static void
+__lock_printlock(lt, lp, ispgno)
+ DB_LOCKTAB *lt;
+ struct __db_lock *lp;
+ int ispgno;
+{
+ DB_LOCKOBJ *lockobj;
+ db_pgno_t pgno;
+ size_t obj;
+ u_int8_t *ptr;
+ char *mode, *stat;
+
+ switch (lp->mode) {
+ case DB_LOCK_IREAD:
+ mode = "IREAD";
+ break;
+ case DB_LOCK_IWR:
+ mode = "IWR";
+ break;
+ case DB_LOCK_IWRITE:
+ mode = "IWRITE";
+ break;
+ case DB_LOCK_NG:
+ mode = "NG";
+ break;
+ case DB_LOCK_READ:
+ mode = "READ";
+ break;
+ case DB_LOCK_WRITE:
+ mode = "WRITE";
+ break;
+ default:
+ mode = "UNKNOWN";
+ break;
+ }
+ switch (lp->status) {
+ case DB_LSTAT_ABORTED:
+ stat = "ABORT";
+ break;
+ case DB_LSTAT_ERR:
+ stat = "ERROR";
+ break;
+ case DB_LSTAT_FREE:
+ stat = "FREE";
+ break;
+ case DB_LSTAT_HELD:
+ stat = "HELD";
+ break;
+ case DB_LSTAT_NOGRANT:
+ stat = "NONE";
+ break;
+ case DB_LSTAT_WAITING:
+ stat = "WAIT";
+ break;
+ case DB_LSTAT_PENDING:
+ stat = "PENDING";
+ break;
+ default:
+ stat = "UNKNOWN";
+ break;
+ }
+ printf("\t%lu\t%s\t%lu\t%s\t",
+ (u_long)lp->holder, mode, (u_long)lp->refcount, stat);
+
+ lockobj = (DB_LOCKOBJ *)((u_int8_t *)lp + lp->obj);
+ ptr = SH_DBT_PTR(&lockobj->lockobj);
+ if (ispgno) {
+ /* Assume this is a DBT lock. */
+ memcpy(&pgno, ptr, sizeof(db_pgno_t));
+ printf("page %lu\n", (u_long)pgno);
+ } else {
+ obj = (u_int8_t *)lp + lp->obj - (u_int8_t *)lt->region;
+ printf("0x%lx ", (u_long)obj);
+ __db_pr(ptr, lockobj->lockobj.size);
+ printf("\n");
+ }
+}
+
+#endif
+
+static int
+__lock_count_locks(lrp)
+ DB_LOCKREGION *lrp;
+{
+ struct __db_lock *newl;
+ int count;
+
+ count = 0;
+ for (newl = SH_TAILQ_FIRST(&lrp->free_locks, __db_lock);
+ newl != NULL;
+ newl = SH_TAILQ_NEXT(newl, links, __db_lock))
+ count++;
+
+ return (count);
+}
+
+static int
+__lock_count_objs(lrp)
+ DB_LOCKREGION *lrp;
+{
+ DB_LOCKOBJ *obj;
+ int count;
+
+ count = 0;
+ for (obj = SH_TAILQ_FIRST(&lrp->free_objs, __db_lockobj);
+ obj != NULL;
+ obj = SH_TAILQ_NEXT(obj, links, __db_lockobj))
+ count++;
+
+ return (count);
+}
+
+/*
+ * PUBLIC: int __lock_getobj __P((DB_LOCKTAB *,
+ * PUBLIC: u_int32_t, DBT *, u_int32_t type, DB_LOCKOBJ **));
+ */
+int
+__lock_getobj(lt, locker, dbt, type, objp)
+ DB_LOCKTAB *lt;
+ u_int32_t locker, type;
+ DBT *dbt;
+ DB_LOCKOBJ **objp;
+{
+ DB_LOCKREGION *lrp;
+ DB_LOCKOBJ *sh_obj;
+ u_int32_t obj_size;
+ int ret;
+ void *p, *src;
+
+ lrp = lt->region;
+
+ /* Look up the object in the hash table. */
+ if (type == DB_LOCK_OBJTYPE) {
+ __db_hashlookup(lt->hashtab, __db_lockobj, links, dbt, sh_obj,
+ lrp->table_size, __lock_ohash, __lock_cmp);
+ obj_size = dbt->size;
+ } else {
+ __db_hashlookup(lt->hashtab, __db_lockobj, links, locker,
+ sh_obj, lrp->table_size, __lock_locker_hash,
+ __lock_locker_cmp);
+ obj_size = sizeof(locker);
+ }
+
+ /*
+ * If we found the object, then we can just return it. If
+ * we didn't find the object, then we need to create it.
+ */
+ if (sh_obj == NULL) {
+ /* Create new object and then insert it into hash table. */
+ if ((sh_obj = SH_TAILQ_FIRST(&lrp->free_objs, __db_lockobj))
+ == NULL) {
+ if ((ret = __lock_grow_region(lt, DB_LOCK_OBJ, 0)) != 0)
+ return (ret);
+ lrp = lt->region;
+ sh_obj = SH_TAILQ_FIRST(&lrp->free_objs, __db_lockobj);
+ }
+ if ((ret = __db_shalloc(lt->mem, obj_size, 0, &p)) != 0) {
+ if ((ret = __lock_grow_region(lt,
+ DB_LOCK_MEM, obj_size)) != 0)
+ return (ret);
+ lrp = lt->region;
+ /* Reacquire the head of the list. */
+ sh_obj = SH_TAILQ_FIRST(&lrp->free_objs, __db_lockobj);
+ (void)__db_shalloc(lt->mem, obj_size, 0, &p);
+ }
+ sh_obj->type = type;
+ src = type == DB_LOCK_OBJTYPE ? dbt->data : (void *)&locker;
+ memcpy(p, src, obj_size);
+ SH_TAILQ_REMOVE(&lrp->free_objs, sh_obj, links, __db_lockobj);
+
+ SH_TAILQ_INIT(&sh_obj->waiters);
+ if (type == DB_LOCK_LOCKER)
+ SH_LIST_INIT(&sh_obj->heldby);
+ else
+ SH_TAILQ_INIT(&sh_obj->holders);
+ sh_obj->lockobj.size = obj_size;
+ sh_obj->lockobj.off = SH_PTR_TO_OFF(&sh_obj->lockobj, p);
+
+ __db_hashinsert(lt->hashtab, __db_lockobj, links, sh_obj,
+ lrp->table_size, __lock_lhash);
+
+ if (type == DB_LOCK_LOCKER)
+ lrp->nlockers++;
+ }
+
+ *objp = sh_obj;
+ return (0);
+}
+
+/*
+ * Any lock on the waitlist has a process waiting for it. Therefore, we
+ * can't return the lock to the freelist immediately. Instead, we can
+ * remove the lock from the list of waiters, set the status field of the
+ * lock, and then let the process waking up return the lock to the
+ * free list.
+ */
+static void
+__lock_remove_waiter(lt, sh_obj, lockp, status)
+ DB_LOCKTAB *lt;
+ DB_LOCKOBJ *sh_obj;
+ struct __db_lock *lockp;
+ db_status_t status;
+{
+ SH_TAILQ_REMOVE(&sh_obj->waiters, lockp, links, __db_lock);
+ lockp->status = status;
+
+ /* Wake whoever is waiting on this lock. */
+ (void)__db_mutex_unlock(&lockp->mutex, lt->fd);
+}
+
+static void
+__lock_freeobj(lt, obj)
+ DB_LOCKTAB *lt;
+ DB_LOCKOBJ *obj;
+{
+ __db_hashremove_el(lt->hashtab, __db_lockobj, links,
+ obj, lt->region->table_size, __lock_lhash);
+ __db_shalloc_free(lt->mem, SH_DBT_PTR(&obj->lockobj));
+ SH_TAILQ_INSERT_HEAD(&lt->region->free_objs, obj, links, __db_lockobj);
+}
+
+static void
+__lock_checklocker(lt, lockp, do_remove)
+ DB_LOCKTAB *lt;
+ struct __db_lock *lockp;
+ int do_remove;
+{
+ DB_LOCKOBJ *sh_locker;
+
+ if (do_remove)
+ SH_LIST_REMOVE(lockp, locker_links, __db_lock);
+
+ /* if the locker list is NULL, free up the object. */
+ if (__lock_getobj(lt, lockp->holder, NULL, DB_LOCK_LOCKER, &sh_locker)
+ == 0 && SH_LIST_FIRST(&sh_locker->heldby, __db_lock) == NULL) {
+ __lock_freeobj(lt, sh_locker);
+ lt->region->nlockers--;
+ }
+}
+
+static void
+__lock_reset_region(lt)
+ DB_LOCKTAB *lt;
+{
+ lt->conflicts = (u_int8_t *)lt->region + sizeof(DB_LOCKREGION);
+ lt->hashtab =
+ (DB_HASHTAB *)((u_int8_t *)lt->region + lt->region->hash_off);
+ lt->mem = (void *)((u_int8_t *)lt->region + lt->region->mem_off);
+ lt->reg_size = lt->region->hdr.size;
+}
diff --git a/db2/lock/lock_conflict.c b/db2/lock/lock_conflict.c
new file mode 100644
index 0000000..ff0287f
--- /dev/null
+++ b/db2/lock/lock_conflict.c
@@ -0,0 +1,39 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1996, 1997
+ * Sleepycat Software. All rights reserved.
+ */
+
+#include "config.h"
+
+#ifndef lint
+static const char sccsid[] = "@(#)lock_conflict.c 10.2 (Sleepycat) 6/21/97";
+#endif /* not lint */
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/types.h>
+#endif
+
+#include "db_int.h"
+
+/*
+ * The conflict arrays are set up such that the row is the lock you
+ * are holding and the column is the lock that is desired.
+ */
+const u_int8_t db_rw_conflicts[] = {
+ /* N R W */
+ /* N */ 0, 0, 0,
+ /* R */ 0, 0, 1,
+ /* W */ 0, 1, 1
+};
+
+const u_int8_t db_riw_conflicts[] = {
+ /* N S X IS IX SIX */
+ /* N */ 0, 0, 0, 0, 0, 0,
+ /* S */ 0, 0, 1, 0, 1, 1,
+ /* X */ 1, 1, 1, 1, 1, 1,
+ /* IS */ 0, 0, 1, 0, 0, 0,
+ /* IX */ 0, 1, 1, 0, 0, 0,
+ /* SIX */ 0, 1, 1, 0, 0, 0
+};
diff --git a/db2/lock/lock_deadlock.c b/db2/lock/lock_deadlock.c
new file mode 100644
index 0000000..54a73af
--- /dev/null
+++ b/db2/lock/lock_deadlock.c
@@ -0,0 +1,496 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1996, 1997
+ * Sleepycat Software. All rights reserved.
+ */
+
+#include "config.h"
+
+#ifndef lint
+static const char copyright[] =
+"@(#) Copyright (c) 1997\n\
+ Sleepycat Software Inc. All rights reserved.\n";
+static const char sccsid[] = "@(#)lock_deadlock.c 10.20 (Sleepycat) 8/21/97";
+#endif
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/types.h>
+
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#endif
+
+#include "db_int.h"
+#include "shqueue.h"
+#include "db_shash.h"
+#include "lock.h"
+#include "common_ext.h"
+
+#define ISSET_MAP(M, N) (M[(N) / 32] & (1 << (N) % 32))
+
+#define CLEAR_MAP(M, N) { \
+ u_int32_t __i; \
+ for (__i = 0; __i < (N); __i++) \
+ M[__i] = 0; \
+}
+
+#define SET_MAP(M, B) (M[(B) / 32] |= (1 << ((B) % 32)))
+#define CLR_MAP(M, B) (M[(B) / 32] &= ~(1 << ((B) % 32)))
+
+#define OR_MAP(D, S, N) { \
+ u_int32_t __i; \
+ for (__i = 0; __i < (N); __i++) \
+ D[__i] |= S[__i]; \
+}
+#define BAD_KILLID 0xffffffff
+
+typedef struct {
+ int valid;
+ u_int32_t id;
+ DB_LOCK last_lock;
+} locker_info;
+
+static int __dd_abort __P((DB_ENV *, locker_info *));
+static int __dd_build __P((DB_ENV *, u_int32_t **, int *, locker_info **));
+#ifdef DEBUG
+static void __dd_debug __P((DB_ENV *, locker_info *, u_int32_t *, int));
+#endif
+static u_int32_t
+ *__dd_find __P((u_int32_t *, locker_info *, u_int32_t));
+
+int
+lock_detect(lt, flags, atype)
+ DB_LOCKTAB *lt;
+ int flags;
+ u_int32_t atype;
+{
+ DB_ENV *dbenv;
+ locker_info *idmap;
+ u_int32_t *bitmap, *deadlock, killid;
+ int do_pass, i, nlockers, nentries, ret;
+
+ /* Validate arguments. */
+ if ((ret =
+ __db_fchk(lt->dbenv, "lock_detect", flags, DB_LOCK_CONFLICT)) != 0)
+ return (ret);
+
+ /* Check if a detector run is necessary. */
+ do_pass = 1;
+ dbenv = lt->dbenv;
+ if (LF_ISSET(DB_LOCK_CONFLICT)) {
+ /* Make a pass every time a lock waits. */
+ LOCK_LOCKREGION(lt);
+ do_pass = dbenv->lk_info->region->need_dd != 0;
+ UNLOCK_LOCKREGION(lt);
+ }
+
+ if (!do_pass)
+ return (0);
+
+ /* Build the waits-for bitmap. */
+ if ((ret = __dd_build(dbenv, &bitmap, &nlockers, &idmap)) != 0)
+ return (ret);
+
+ if (nlockers == 0)
+ return (0);
+#ifdef DEBUG
+ if (dbenv->db_verbose != 0)
+ __dd_debug(dbenv, idmap, bitmap, nlockers);
+#endif
+ /* Find a deadlock. */
+ deadlock = __dd_find(bitmap, idmap, nlockers);
+ nentries = ALIGN(nlockers, 32) / 32;
+ killid = BAD_KILLID;
+ if (deadlock != NULL) {
+ /* Kill someone. */
+ switch (atype) {
+ case DB_LOCK_OLDEST:
+ /*
+ * Find the first bit set in the current
+ * array and then look for a lower tid in
+ * the array.
+ */
+ for (i = 0; i < nlockers; i++)
+ if (ISSET_MAP(deadlock, i))
+ killid = i;
+
+ if (killid == BAD_KILLID) {
+ __db_err(dbenv,
+ "warning: could not find %s",
+ "locker to abort");
+ break;
+ }
+
+ /*
+ * The oldest transaction has the lowest
+ * transaction id.
+ */
+ for (i = killid + 1; i < nlockers; i++)
+ if (ISSET_MAP(deadlock, i) &&
+ idmap[i].id < idmap[killid].id)
+ killid = i;
+ break;
+ case DB_LOCK_DEFAULT:
+ case DB_LOCK_RANDOM:
+ /*
+ * We are trying to calculate the id of the
+ * locker whose entry is indicated by deadlock.
+ * We know that this is less than nlockers, so
+ * the cast below is valid.
+ */
+ killid =
+ (u_int32_t)((deadlock - bitmap) / nentries);
+ break;
+ case DB_LOCK_YOUNGEST:
+ /*
+ * Find the first bit set in the current
+ * array and then look for a lower tid in
+ * the array.
+ */
+ for (i = 0; i < nlockers; i++)
+ if (ISSET_MAP(deadlock, i))
+ killid = i;
+
+ if (killid == BAD_KILLID) {
+ __db_err(dbenv,
+ "warning: could not find %s",
+ "locker to abort");
+ break;
+ }
+ /*
+ * The youngest transaction has the highest
+ * transaction id.
+ */
+ for (i = killid + 1; i < nlockers; i++)
+ if (ISSET_MAP(deadlock, i) &&
+ idmap[i].id > idmap[killid].id)
+ killid = i;
+ break;
+ default:
+ killid = BAD_KILLID;
+ ret = EINVAL;
+ }
+
+ /* Kill the locker with lockid idmap[killid]. */
+ if (dbenv->db_verbose != 0 && killid != BAD_KILLID)
+ __db_err(dbenv, "Aborting locker %lx",
+ (u_long)idmap[killid].id);
+
+ if (killid != BAD_KILLID &&
+ (ret = __dd_abort(dbenv, &idmap[killid])) != 0)
+ __db_err(dbenv,
+ "warning: unable to abort locker %lx",
+ (u_long)idmap[killid].id);
+ }
+ free(bitmap);
+ free(idmap);
+
+ return (ret);
+}
+
+/*
+ * ========================================================================
+ * Utilities
+ */
+static int
+__dd_build(dbenv, bmp, nlockers, idmap)
+ DB_ENV *dbenv;
+ u_int32_t **bmp;
+ int *nlockers;
+ locker_info **idmap;
+{
+ DB_LOCKTAB *lt;
+ DB_LOCKOBJ *op, *lockerp;
+ struct __db_lock *lp;
+ u_int32_t *bitmap, count, *entryp, i, id, nentries, *tmpmap;
+ locker_info *id_array;
+ int is_first, ret;
+
+ lt = dbenv->lk_info;
+
+ /*
+ * We'll check how many lockers there are, add a few more in for
+ * good measure and then allocate all the structures. Then we'll
+ * verify that we have enough room when we go back in and get the
+ * mutex the second time.
+ */
+ LOCK_LOCKREGION(lt);
+retry: count = lt->region->nlockers;
+ lt->region->need_dd = 0;
+ UNLOCK_LOCKREGION(lt);
+
+ if (count == 0) {
+ *nlockers = 0;
+ return (0);
+ }
+
+ if (dbenv->db_verbose)
+ __db_err(dbenv, "%lu lockers", (u_long)count);
+
+ count += 10;
+ nentries = ALIGN(count, 32) / 32;
+ /*
+ * Allocate enough space for a count by count bitmap matrix.
+ *
+ * XXX
+ * We can probably save the malloc's between iterations just
+ * reallocing if necessary because count grew by too much.
+ */
+ if ((bitmap = (u_int32_t *)calloc((size_t)count,
+ sizeof(u_int32_t) * nentries)) == NULL) {
+ __db_err(dbenv, "%s", strerror(ENOMEM));
+ return (ENOMEM);
+ }
+
+ if ((tmpmap =
+ (u_int32_t *)calloc(sizeof(u_int32_t), nentries)) == NULL) {
+ __db_err(dbenv, "%s", strerror(ENOMEM));
+ free(bitmap);
+ return (ENOMEM);
+ }
+
+ if ((id_array = (locker_info *)calloc((size_t)count,
+ sizeof(locker_info))) == NULL) {
+ __db_err(dbenv, "%s", strerror(ENOMEM));
+ free(bitmap);
+ free(tmpmap);
+ return (ENOMEM);
+ }
+
+ /*
+ * Now go back in and actually fill in the matrix.
+ */
+ LOCK_LOCKREGION(lt);
+ if (lt->region->nlockers > count) {
+ free(bitmap);
+ free(tmpmap);
+ free(id_array);
+ goto retry;
+ }
+
+ /*
+ * First we go through and assign each locker a deadlock detector id.
+ * Note that we fill in the idmap in the next loop since that's the
+ * only place where we conveniently have both the deadlock id and the
+ * actual locker.
+ */
+ for (id = 0, i = 0; i < lt->region->table_size; i++)
+ for (op = SH_TAILQ_FIRST(&lt->hashtab[i], __db_lockobj);
+ op != NULL; op = SH_TAILQ_NEXT(op, links, __db_lockobj))
+ if (op->type == DB_LOCK_LOCKER)
+ op->dd_id = id++;
+ /*
+ * We go through the hash table and find each object. For each object,
+ * we traverse the waiters list and add an entry in the waitsfor matrix
+ * for each waiter/holder combination.
+ */
+ for (i = 0; i < lt->region->table_size; i++) {
+ for (op = SH_TAILQ_FIRST(&lt->hashtab[i], __db_lockobj);
+ op != NULL; op = SH_TAILQ_NEXT(op, links, __db_lockobj)) {
+ if (op->type != DB_LOCK_OBJTYPE)
+ continue;
+ CLEAR_MAP(tmpmap, nentries);
+
+ /*
+ * First we go through and create a bit map that
+ * represents all the holders of this object.
+ */
+ for (lp = SH_TAILQ_FIRST(&op->holders, __db_lock);
+ lp != NULL;
+ lp = SH_TAILQ_NEXT(lp, links, __db_lock)) {
+ if ((errno = __lock_getobj(lt, lp->holder,
+ NULL, DB_LOCK_LOCKER, &lockerp)) != 0) {
+ __db_err(dbenv,
+ "warning unable to find object");
+ continue;
+ }
+ id_array[lockerp->dd_id].id = lp->holder;
+ id_array[lockerp->dd_id].valid = 1;
+
+ /*
+ * If the holder has already been aborted, then
+ * we should ignore it for now.
+ */
+ if (lp->status == DB_LSTAT_HELD)
+ SET_MAP(tmpmap, lockerp->dd_id);
+ }
+
+ /*
+ * Next, for each waiter, we set its row in the matrix
+ * equal to the map of holders we set up above.
+ */
+ for (is_first = 1,
+ lp = SH_TAILQ_FIRST(&op->waiters, __db_lock);
+ lp != NULL;
+ is_first = 0,
+ lp = SH_TAILQ_NEXT(lp, links, __db_lock)) {
+ if ((ret = __lock_getobj(lt,
+ lp->holder, NULL, DB_LOCK_LOCKER, &lockerp))
+ != 0) {
+ __db_err(dbenv,
+ "warning unable to find object");
+ continue;
+ }
+ id_array[lockerp->dd_id].id = lp->holder;
+ id_array[lockerp->dd_id].valid = 1;
+
+ /*
+ * If the transaction is pending abortion, then
+ * ignore it on this iteration.
+ */
+ if (lp->status != DB_LSTAT_WAITING)
+ continue;
+
+ entryp = bitmap + (nentries * lockerp->dd_id);
+ OR_MAP(entryp, tmpmap, nentries);
+ /*
+ * If this is the first waiter on the queue,
+ * then we remove the waitsfor relationship
+ * with oneself. However, if it's anywhere
+ * else on the queue, then we have to keep
+ * it and we have an automatic deadlock.
+ */
+ if (is_first)
+ CLR_MAP(entryp, lockerp->dd_id);
+ }
+ }
+ }
+
+ /* Now for each locker; record its last lock. */
+ for (id = 0; id < count; id++) {
+ if (!id_array[id].valid)
+ continue;
+ if ((ret = __lock_getobj(lt,
+ id_array[id].id, NULL, DB_LOCK_LOCKER, &lockerp)) != 0) {
+ __db_err(dbenv,
+ "No locks for locker %lu", (u_long)id_array[id].id);
+ continue;
+ }
+ lp = SH_LIST_FIRST(&lockerp->heldby, __db_lock);
+ if (lp != NULL)
+ id_array[id].last_lock = LOCK_TO_OFFSET(lt, lp);
+ }
+
+ /* Pass complete, reset the deadlock detector bit. */
+ lt->region->need_dd = 0;
+ UNLOCK_LOCKREGION(lt);
+
+ /*
+ * Now we can release everything except the bitmap matrix that we
+ * created.
+ */
+ *nlockers = id;
+ *idmap = id_array;
+ *bmp = bitmap;
+ free(tmpmap);
+ return (0);
+}
+
+static u_int32_t *
+__dd_find(bmp, idmap, nlockers)
+ u_int32_t *bmp;
+ locker_info *idmap;
+ u_int32_t nlockers;
+{
+ u_int32_t i, j, nentries, *mymap, *tmpmap;
+
+ /*
+ * For each locker, or in the bits from the lockers
+ * on which that locker is waiting.
+ */
+ nentries = ALIGN(nlockers, 32) / 32;
+ for (mymap = bmp, i = 0; i < nlockers; i++, mymap += nentries) {
+ if (!idmap[i].valid)
+ continue;
+ for (j = 0; j < nlockers; j++) {
+ if (ISSET_MAP(mymap, j)) {
+ /* Find the map for this bit. */
+ tmpmap = bmp + (nentries * j);
+ OR_MAP(mymap, tmpmap, nentries);
+ if (ISSET_MAP(mymap, i))
+ return (mymap);
+ }
+ }
+ }
+ return (NULL);
+}
+
+static int
+__dd_abort(dbenv, info)
+ DB_ENV *dbenv;
+ locker_info *info;
+{
+ DB_LOCKTAB *lt;
+ DB_LOCKOBJ *lockerp, *sh_obj;
+ struct __db_lock *lockp;
+ int ret;
+
+ lt = dbenv->lk_info;
+ LOCK_LOCKREGION(lt);
+
+ /* Find the locker's last lock. */
+ if ((ret =
+ __lock_getobj(lt, info->id, NULL, DB_LOCK_LOCKER, &lockerp)) != 0)
+ goto out;
+
+ lockp = SH_LIST_FIRST(&lockerp->heldby, __db_lock);
+ if (LOCK_TO_OFFSET(lt, lockp) != info->last_lock ||
+ lockp == NULL || lockp->status != DB_LSTAT_WAITING)
+ goto out;
+
+ /* Abort lock, take it off list, and wake up this lock. */
+ lockp->status = DB_LSTAT_ABORTED;
+ lt->region->ndeadlocks++;
+ SH_LIST_REMOVE(lockp, locker_links, __db_lock);
+ sh_obj = (DB_LOCKOBJ *)((u_int8_t *)lockp + lockp->obj);
+ SH_TAILQ_REMOVE(&sh_obj->waiters, lockp, links, __db_lock);
+ (void)__db_mutex_unlock(&lockp->mutex, lt->fd);
+
+ ret = 0;
+
+out: UNLOCK_LOCKREGION(lt);
+ return (ret);
+}
+
+#ifdef DEBUG
+static void
+__dd_debug(dbenv, idmap, bitmap, nlockers)
+ DB_ENV *dbenv;
+ locker_info *idmap;
+ u_int32_t *bitmap;
+ int nlockers;
+{
+ u_int32_t *mymap;
+ int i, j, nentries;
+ char *msgbuf;
+
+ __db_err(dbenv, "Waitsfor array");
+ __db_err(dbenv, "waiter\twaiting on");
+ /*
+ * Alloc space to print 10 bytes per item waited on.
+ */
+ if ((msgbuf = (char *)malloc((nlockers + 1) * 10 + 64)) == NULL) {
+ errno = ENOMEM;
+ __db_err(dbenv, "%s", strerror(errno));
+ return;
+ }
+
+ nentries = ALIGN(nlockers, 32) / 32;
+ for (mymap = bitmap, i = 0; i < nlockers; i++, mymap += nentries) {
+ if (!idmap[i].valid)
+ continue;
+ sprintf(msgbuf, "%lx\t\t", (u_long)idmap[i].id);/* Waiter. */
+ for (j = 0; j < nlockers; j++)
+ if (ISSET_MAP(mymap, j))
+ sprintf(msgbuf, "%s %lx", msgbuf,
+ (u_long)idmap[j].id);
+ (void)sprintf(msgbuf,
+ "%s %lu", msgbuf, (u_long)idmap[i].last_lock);
+ __db_err(dbenv, msgbuf);
+ }
+
+ free(msgbuf);
+}
+#endif
diff --git a/db2/lock/lock_util.c b/db2/lock/lock_util.c
new file mode 100644
index 0000000..4063849
--- /dev/null
+++ b/db2/lock/lock_util.c
@@ -0,0 +1,103 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1996, 1997
+ * Sleepycat Software. All rights reserved.
+ */
+
+#include "config.h"
+
+#ifndef lint
+static const char sccsid[] = "@(#)lock_util.c 10.4 (Sleepycat) 7/22/97";
+#endif /* not lint */
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/types.h>
+
+#include <fcntl.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#endif
+
+#include "db_int.h"
+#include "shqueue.h"
+#include "db_page.h"
+#include "db_shash.h"
+#include "hash.h"
+#include "lock.h"
+
+/*
+ * This function is used to compare a DBT that is about to be entered
+ * into a hash table with an object already in the hash table. Note
+ * that it just returns true on equal and 0 on not-equal. Therefore this
+ * cannot be used as a sort function; its purpose is to be used as a
+ * hash comparison function.
+ * PUBLIC: int __lock_cmp __P((DBT *, DB_LOCKOBJ *));
+ */
+int
+__lock_cmp(dbt, lock_obj)
+ DBT *dbt;
+ DB_LOCKOBJ *lock_obj;
+{
+ void *obj_data;
+
+ if (lock_obj->type != DB_LOCK_OBJTYPE)
+ return (0);
+ obj_data = SH_DBT_PTR(&lock_obj->lockobj);
+ return (dbt->size == lock_obj->lockobj.size &&
+ memcmp(dbt->data, obj_data, dbt->size) == 0);
+}
+
+/*
+ * PUBLIC: int __lock_locker_cmp __P((u_int32_t, DB_LOCKOBJ *));
+ */
+int
+__lock_locker_cmp(locker, lock_obj)
+ u_int32_t locker;
+ DB_LOCKOBJ *lock_obj;
+{
+ void *obj_data;
+
+ if (lock_obj->type != DB_LOCK_LOCKER)
+ return (0);
+
+ obj_data = SH_DBT_PTR(&lock_obj->lockobj);
+ return (memcmp(&locker, obj_data, sizeof(u_int32_t)) == 0);
+}
+
+/*
+ * PUBLIC: int __lock_ohash __P((DBT *));
+ */
+int
+__lock_ohash(dbt)
+ DBT *dbt;
+{
+ return (__ham_func5(dbt->data, dbt->size));
+}
+
+/*
+ * PUBLIC: u_int32_t __lock_locker_hash __P((u_int32_t));
+ */
+u_int32_t
+__lock_locker_hash(locker)
+ u_int32_t locker;
+{
+ return (__ham_func5(&locker, sizeof(locker)));
+}
+
+/*
+ * PUBLIC: u_int32_t __lock_lhash __P((DB_LOCKOBJ *));
+ */
+u_int32_t
+__lock_lhash(lock_obj)
+ DB_LOCKOBJ *lock_obj;
+{
+ void *obj_data;
+
+ obj_data = SH_DBT_PTR(&lock_obj->lockobj);
+ return (__ham_func5(obj_data, lock_obj->lockobj.size));
+}
+