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| author | Ulrich Drepper <drepper@redhat.com> | 1999-08-30 21:51:29 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 1999-08-30 21:51:29 +0000 |
| commit | 9a93ac006df5199c4dc03710043d1d77396ff29e (patch) | |
| tree | 8c244c606079be26347cec0a310693c3f829e530 /db2/mutex | |
| parent | 0742e50134bfc3db08895c020a940a62e5036cfb (diff) | |
| download | glibc-9a93ac006df5199c4dc03710043d1d77396ff29e.zip glibc-9a93ac006df5199c4dc03710043d1d77396ff29e.tar.gz glibc-9a93ac006df5199c4dc03710043d1d77396ff29e.tar.bz2 | |
Update.
* db2/db_int.h: Change tsl_t type to u_int32_t.
* db2/mutex/mutex.c: Allow Alpha mutex definitions.
* db2/mutex/alpha.h: New file.
* db2/mutex/sparc.gcc: Fix store code for v9. Simplify clear code.
* sysdeps/alpha/Makefile [db2]: Set CFLAGS of mutex.c to make spinlocks
known.
Patches by Richard Henderson.
Diffstat (limited to 'db2/mutex')
| -rw-r--r-- | db2/mutex/alpha.h | 26 | ||||
| -rw-r--r-- | db2/mutex/mutex.c | 4 | ||||
| -rw-r--r-- | db2/mutex/sparc.gcc | 14 |
3 files changed, 36 insertions, 8 deletions
diff --git a/db2/mutex/alpha.h b/db2/mutex/alpha.h new file mode 100644 index 0000000..ad3afc4 --- /dev/null +++ b/db2/mutex/alpha.h @@ -0,0 +1,26 @@ +/* For alpha, 0 is clear, 1 is set. */ + +#ifdef __GNUC__ +#define TSL_SET(tsl) ({ \ + register tsl_t *__l = (tsl); \ + int __r; \ + asm volatile( \ + "1: ldl_l %0,%1\n" \ + " blbs %0,2f\n" \ + " mov 1,%0\n" \ + " stl_c %0,%1\n" \ + " bne %0,1b\n" \ + " mb\n" \ + "2:" \ + : "=&r"(__r), "=m"(*__l) : "m"(*__l) : "memory"); \ + __r; \ +}) +#endif + +#ifdef __DECC +#include <alpha/builtins.h> +#define TSL_SET(tsl) (__LOCK_LONG_RETRY((tsl), 1) != 0) +#endif + +#define TSL_UNSET(tsl) (*(tsl) = 0) +#define TSL_INIT(tsl) TSL_UNSET(tsl) diff --git a/db2/mutex/mutex.c b/db2/mutex/mutex.c index acc6aa0..2fac14c 100644 --- a/db2/mutex/mutex.c +++ b/db2/mutex/mutex.c @@ -110,6 +110,10 @@ static const char sccsid[] = "@(#)mutex.c 10.52 (Sleepycat) 11/8/98"; #include "x86.gcc" #endif +#ifdef HAVE_ASSEM_ALPHA +#include "alpha.h" +#endif + #ifdef WIN16 /* Win16 spinlocks are simple because we cannot possibly be preempted. */ #define TSL_INIT(tsl) diff --git a/db2/mutex/sparc.gcc b/db2/mutex/sparc.gcc index 8445a06..9e3239b 100644 --- a/db2/mutex/sparc.gcc +++ b/db2/mutex/sparc.gcc @@ -13,21 +13,19 @@ * For gcc/sparc, 0 is clear, 1 is set. */ -#if defined(__sparcv9__) -Does the following code need membar instructions for V9 processors? -#endif +/* The stbar is needed for v8, and is implemented as membar #sync on v9, + so is functional there as well. For v7, stbar may generate an illegal + instruction and we have no way to tell what we're running on. Some + operating systems notice and skip this instruction in the fault handler. */ #define TSL_SET(tsl) ({ \ register tsl_t *__l = (tsl); \ register tsl_t __r; \ __asm__ volatile \ - ("ldstub [%1],%0" \ + ("ldstub [%1],%0; stbar" \ : "=r"( __r) : "r" (__l)); \ !__r; \ }) -#define TSL_UNSET(tsl) ({ \ - register tsl_t *__l = (tsl); \ - __asm__ volatile ("stb %%g0,[%0]" : : "r" (__l)); \ -}) +#define TSL_UNSET(tsl) ((tsl) = 0) #define TSL_INIT(tsl) TSL_UNSET(tsl) |