mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-21 20:40:05 +00:00
dc1a77269c
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-ID: <20240323173301.151066-19-bugaevc@gmail.com>
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/* Out-of-line notification function for the GSCOPE locking mechanism.
|
|
Copyright (C) 2007-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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 <ldsodefs.h>
|
|
#include <pthread.h>
|
|
#include <htl/pt-internal.h>
|
|
|
|
static inline int *
|
|
thread_gscope_flag (struct __pthread *t)
|
|
{
|
|
#if TLS_TCB_AT_TP
|
|
return &t->tcb->gscope_flag;
|
|
#elif TLS_DTV_AT_TP
|
|
return &((tcbprehead_t *) t->tcb - 1)->gscope_flag;
|
|
#else
|
|
# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
|
|
#endif
|
|
}
|
|
|
|
void
|
|
__thread_gscope_wait (void)
|
|
{
|
|
size_t i;
|
|
struct __pthread *t;
|
|
int *gscope_flagp;
|
|
|
|
__libc_rwlock_rdlock (GL (dl_pthread_threads_lock));
|
|
|
|
/* Iterate over the list of threads. */
|
|
for (i = 0; i < GL (dl_pthread_num_threads); ++i)
|
|
{
|
|
t = GL (dl_pthread_threads[i]);
|
|
if (t == NULL || *thread_gscope_flag (t) == THREAD_GSCOPE_FLAG_UNUSED)
|
|
continue;
|
|
|
|
gscope_flagp = thread_gscope_flag (t);
|
|
|
|
/* We have to wait until this thread is done with the global
|
|
scope. First tell the thread that we are waiting and
|
|
possibly have to be woken. */
|
|
if (atomic_compare_and_exchange_bool_acq (gscope_flagp,
|
|
THREAD_GSCOPE_FLAG_WAIT,
|
|
THREAD_GSCOPE_FLAG_USED))
|
|
continue;
|
|
|
|
do
|
|
lll_wait (gscope_flagp, THREAD_GSCOPE_FLAG_WAIT, LLL_PRIVATE);
|
|
while (*gscope_flagp == THREAD_GSCOPE_FLAG_WAIT);
|
|
}
|
|
|
|
__libc_rwlock_unlock (GL (dl_pthread_threads_lock));
|
|
}
|