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:
53 /* Get internal lock. */
60 cmpxchgl %edx, cond_lock(%ebx)
64 2: addl $wakeup_seq, %ebx
65 movl total_seq+4-wakeup_seq(%ebx), %eax
66 movl total_seq-wakeup_seq(%ebx), %ecx
73 /* Cause all currently waiting threads to recognize they are
77 movl %ecx, woken_seq-wakeup_seq(%ebx)
78 movl %eax, woken_seq-wakeup_seq+4(%ebx)
79 addl $1, broadcast_seq-wakeup_seq(%ebx)
81 /* Get the address of the mutex used. */
82 movl dep_mutex-wakeup_seq(%ebx), %edi
86 subl $1, cond_lock-wakeup_seq(%ebx)
89 /* Don't use requeue for pshared condvars. */
93 /* Wake up all threads. */
94 movl $FUTEX_REQUEUE, %ecx
96 movl $0x7fffffff, %esi
98 /* Get the address of the futex involved. */
100 addl $MUTEX_FUTEX, %edi
104 #ifndef __ASSUME_FUTEX_REQUEUE
118 subl $1, cond_lock-wakeup_seq(%ebx)
127 /* Initial locking failed. */
132 leal cond_lock(%ebx), %ecx
134 call __lll_mutex_lock_wait
137 /* Unlock in loop requires waekup. */
138 5: leal cond_lock-wakeup_seq(%ebx), %eax
139 call __lll_mutex_unlock_wake
142 /* Unlock in loop requires waekup. */
143 7: leal cond_lock-wakeup_seq(%ebx), %eax
144 call __lll_mutex_unlock_wake
147 9: /* The futex requeue functionality is not available. */
148 movl $0x7fffffff, %edx
149 movl $FUTEX_WAKE, %ecx
150 movl $SYS_futex, %eax
153 .size __pthread_cond_broadcast, .-__pthread_cond_broadcast
154 versioned_symbol (libpthread, __pthread_cond_broadcast, pthread_cond_broadcast,