1 /* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 #include <shlib-compat.h>
22 #include <lowlevelcond.h>
23 #include <kernel-features.h>
34 #define FUTEX_REQUEUE 3
41 /* int pthread_cond_signal (pthread_cond_t *cond) */
42 .globl __pthread_cond_signal
43 .type __pthread_cond_signal, @function
45 __pthread_cond_signal:
47 /* Get internal lock. */
55 cmpxchgl %esi, cond_lock(%rdi)
59 2: addq $cond_futex, %rdi
60 movq total_seq(%r8), %rcx
61 cmpq wakeup_seq(%r8), %rcx
64 /* Bump the wakeup number. */
65 addq $1, wakeup_seq(%r8)
68 /* Wake up one thread. */
69 movq $FUTEX_WAKE, %rsi
86 /* Initial locking failed. */
91 callq __lll_mutex_lock_wait
97 /* Unlock in loop requires wakeup. */
100 callq __lll_mutex_unlock_wake
102 .size __pthread_cond_signal, .-__pthread_cond_signal
103 versioned_symbol (libpthread, __pthread_cond_signal, pthread_cond_signal,