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_broadcast (pthread_cond_t *cond) */
42 .globl __pthread_cond_broadcast
43 .type __pthread_cond_broadcast, @function
45 __pthread_cond_broadcast:
47 /* Get internal lock. */
54 cmpxchgl %esi, cond_lock(%rdi)
58 2: addq $wakeup_seq, %rdi
59 movq total_seq-wakeup_seq(%rdi), %rcx
63 /* Cause all currently waiting threads to recognize they are
66 movq %rcx, woken_seq-wakeup_seq(%rdi)
67 incl broadcast_seq-wakeup_seq(%rdi)
69 /* Get the address of the mutex used. */
70 movq dep_mutex-wakeup_seq(%rdi), %r8
74 decl cond_lock-wakeup_seq(%rdi)
80 /* Wake up all threads. */
81 movq $FUTEX_REQUEUE, %rsi
84 movq $0x7fffffff, %r10
87 #ifndef __ASSUME_FUTEX_REQUEUE
98 decl cond_lock-wakeup_seq(%rdi)
104 /* Initial locking failed. */
107 addq $cond_lock, %rdi
109 callq __lll_mutex_lock_wait
111 subq $cond_lock, %rdi
115 /* Unlock in loop requires wakeup. */
116 5: addq $cond_lock-wakeup_seq, %rdi
117 callq __lll_mutex_unlock_wake
120 /* Unlock in loop requires wakeup. */
121 7: addq $cond_lock-wakeup_seq, %rdi
122 callq __lll_mutex_unlock_wake
123 subq $cond_lock-wakeup_seq, %rdi
126 9: /* The futex requeue functionality is not available. */
127 movq $0x7fffffff, %rdx
128 movq $FUTEX_WAKE, %rsi
129 movq $SYS_futex, %rax
132 .size __pthread_cond_broadcast, .-__pthread_cond_broadcast
133 versioned_symbol (libpthread, __pthread_cond_broadcast, pthread_cond_broadcast,