1 /* Copyright (C) 2002, 2003, 2004, 2005, 2006 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>
24 #include <pthread-pi-defines.h>
35 #define FUTEX_REQUEUE 3
36 #define FUTEX_CMP_REQUEUE 4
43 /* int pthread_cond_broadcast (pthread_cond_t *cond) */
44 .globl __pthread_cond_broadcast
45 .type __pthread_cond_broadcast, @function
47 __pthread_cond_broadcast:
49 /* Get internal lock. */
56 cmpxchgl %esi, cond_lock(%rdi)
60 2: addq $cond_futex, %rdi
61 movq total_seq-cond_futex(%rdi), %r9
62 cmpq wakeup_seq-cond_futex(%rdi), %r9
65 /* Cause all currently waiting threads to recognize they are
67 movq %r9, wakeup_seq-cond_futex(%rdi)
68 movq %r9, woken_seq-cond_futex(%rdi)
71 incl broadcast_seq-cond_futex(%rdi)
73 /* Get the address of the mutex used. */
74 movq dep_mutex-cond_futex(%rdi), %r8
78 decl cond_lock-cond_futex(%rdi)
84 /* XXX: The kernel so far doesn't support requeue to PI futex. */
85 testl $PI_BIT, MUTEX_KIND(%r8)
88 /* Wake up all threads. */
89 movl $FUTEX_CMP_REQUEUE, %esi
92 movl $0x7fffffff, %r10d
95 /* For any kind of error, which mainly is EAGAIN, we try again
96 with WAKE. The general test also covers running on old
107 decl cond_lock-cond_futex(%rdi)
113 /* Initial locking failed. */
116 addq $cond_lock, %rdi
118 callq __lll_mutex_lock_wait
120 subq $cond_lock, %rdi
124 /* Unlock in loop requires wakeup. */
125 5: addq $cond_lock-cond_futex, %rdi
126 callq __lll_mutex_unlock_wake
129 /* Unlock in loop requires wakeup. */
130 7: addq $cond_lock-cond_futex, %rdi
131 callq __lll_mutex_unlock_wake
132 subq $cond_lock-cond_futex, %rdi
135 9: /* The futex requeue functionality is not available. */
136 movl $0x7fffffff, %edx
137 movl $FUTEX_WAKE, %esi
138 movl $SYS_futex, %eax
141 .size __pthread_cond_broadcast, .-__pthread_cond_broadcast
142 versioned_symbol (libpthread, __pthread_cond_broadcast, pthread_cond_broadcast,