diff options
Diffstat (limited to 'nptl/createthread.c')
| -rw-r--r-- | nptl/createthread.c | 153 |
1 files changed, 0 insertions, 153 deletions
diff --git a/nptl/createthread.c b/nptl/createthread.c deleted file mode 100644 index bc3409b..0000000 --- a/nptl/createthread.c +++ /dev/null @@ -1,153 +0,0 @@ -/* Low-level thread creation for NPTL. Linux version. - Copyright (C) 2002-2021 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <https://www.gnu.org/licenses/>. */ - -#include <sched.h> -#include <setjmp.h> -#include <signal.h> -#include <stdlib.h> -#include <atomic.h> -#include <ldsodefs.h> -#include <tls.h> -#include <stdint.h> - -#include <arch-fork.h> - -#ifdef __NR_clone2 -# define ARCH_CLONE __clone2 -#else -# define ARCH_CLONE __clone -#endif - -/* See the comments in pthread_create.c for the requirements for these - two macros and the create_thread function. */ - -#define START_THREAD_DEFN \ - static int __attribute__ ((noreturn)) start_thread (void *arg) -#define START_THREAD_SELF arg - -/* pthread_create.c defines this using START_THREAD_DEFN - We need a forward declaration here so we can take its address. */ -static int start_thread (void *arg) __attribute__ ((noreturn)); - -static int -create_thread (struct pthread *pd, const struct pthread_attr *attr, - bool *stopped_start, STACK_VARIABLES_PARMS, bool *thread_ran) -{ - /* Determine whether the newly created threads has to be started - stopped since we have to set the scheduling parameters or set the - affinity. */ - bool need_setaffinity = (attr != NULL && attr->extension != NULL - && attr->extension->cpuset != 0); - if (attr != NULL - && (__glibc_unlikely (need_setaffinity) - || __glibc_unlikely ((attr->flags & ATTR_FLAG_NOTINHERITSCHED) != 0))) - *stopped_start = true; - - pd->stopped_start = *stopped_start; - if (__glibc_unlikely (*stopped_start)) - /* See CONCURRENCY NOTES in nptl/pthread_creat.c. */ - lll_lock (pd->lock, LLL_PRIVATE); - - /* We rely heavily on various flags the CLONE function understands: - - CLONE_VM, CLONE_FS, CLONE_FILES - These flags select semantics with shared address space and - file descriptors according to what POSIX requires. - - CLONE_SIGHAND, CLONE_THREAD - This flag selects the POSIX signal semantics and various - other kinds of sharing (itimers, POSIX timers, etc.). - - CLONE_SETTLS - The sixth parameter to CLONE determines the TLS area for the - new thread. - - CLONE_PARENT_SETTID - The kernels writes the thread ID of the newly created thread - into the location pointed to by the fifth parameters to CLONE. - - Note that it would be semantically equivalent to use - CLONE_CHILD_SETTID but it is be more expensive in the kernel. - - CLONE_CHILD_CLEARTID - The kernels clears the thread ID of a thread that has called - sys_exit() in the location pointed to by the seventh parameter - to CLONE. - - The termination signal is chosen to be zero which means no signal - is sent. */ - const int clone_flags = (CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SYSVSEM - | CLONE_SIGHAND | CLONE_THREAD - | CLONE_SETTLS | CLONE_PARENT_SETTID - | CLONE_CHILD_CLEARTID - | 0); - - TLS_DEFINE_INIT_TP (tp, pd); - - if (__glibc_unlikely (ARCH_CLONE (&start_thread, STACK_VARIABLES_ARGS, - clone_flags, pd, &pd->tid, tp, &pd->tid) - == -1)) - return errno; - - /* It's started now, so if we fail below, we'll have to cancel it - and let it clean itself up. */ - *thread_ran = true; - - /* Now we have the possibility to set scheduling parameters etc. */ - if (attr != NULL) - { - int res; - - /* Set the affinity mask if necessary. */ - if (need_setaffinity) - { - assert (*stopped_start); - - res = INTERNAL_SYSCALL_CALL (sched_setaffinity, pd->tid, - attr->extension->cpusetsize, - attr->extension->cpuset); - - if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (res))) - err_out: - { - /* The operation failed. We have to kill the thread. - We let the normal cancellation mechanism do the work. */ - - pid_t pid = __getpid (); - INTERNAL_SYSCALL_CALL (tgkill, pid, pd->tid, SIGCANCEL); - - return INTERNAL_SYSCALL_ERRNO (res); - } - } - - /* Set the scheduling parameters. */ - if ((attr->flags & ATTR_FLAG_NOTINHERITSCHED) != 0) - { - assert (*stopped_start); - - res = INTERNAL_SYSCALL_CALL (sched_setscheduler, pd->tid, - pd->schedpolicy, &pd->schedparam); - - if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (res))) - goto err_out; - } - } - - return 0; -} |