1 /* Copyright (C) 2002, 2003, 2004, 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:
56 /* Get internal lock. */
63 cmpxchgl %edx, cond_lock(%ebx)
67 2: addl $cond_futex, %ebx
68 movl total_seq+4-cond_futex(%ebx), %eax
69 movl total_seq-cond_futex(%ebx), %ebp
70 cmpl wakeup_seq+4-cond_futex(%ebx), %eax
73 cmpl wakeup_seq-cond_futex(%ebx), %ebp
76 /* Cause all currently waiting threads to recognize they are
78 3: movl %ebp, wakeup_seq-cond_futex(%ebx)
79 movl %eax, wakeup_seq-cond_futex+4(%ebx)
80 movl %ebp, woken_seq-cond_futex(%ebx)
81 movl %eax, woken_seq-cond_futex+4(%ebx)
83 addl $1, broadcast_seq-cond_futex(%ebx)
86 /* Get the address of the mutex used. */
87 movl dep_mutex-cond_futex(%ebx), %edi
91 subl $1, cond_lock-cond_futex(%ebx)
94 /* Don't use requeue for pshared condvars. */
98 /* XXX: The kernel so far doesn't support requeue to PI futex. */
99 testl $PI_BIT, MUTEX_KIND(%edi)
102 /* Wake up all threads. */
103 movl $FUTEX_CMP_REQUEUE, %ecx
104 movl $SYS_futex, %eax
105 movl $0x7fffffff, %esi
107 /* Get the address of the futex involved. */
108 # if MUTEX_FUTEX != 0
109 addl $MUTEX_FUTEX, %edi
111 /* FIXME: Until Ingo fixes 4G/4G vDSO, 6 arg syscalls are broken for sysenter.
115 /* For any kind of error, which mainly is EAGAIN, we try again
116 with WAKE. The general test also covers running on old
118 cmpl $0xfffff001, %eax
131 subl $1, cond_lock-cond_futex(%ebx)
141 /* Initial locking failed. */
146 leal cond_lock(%ebx), %ecx
148 call __lll_mutex_lock_wait
151 /* Unlock in loop requires waekup. */
152 5: leal cond_lock-cond_futex(%ebx), %eax
153 call __lll_mutex_unlock_wake
156 /* Unlock in loop requires waekup. */
157 7: leal cond_lock-cond_futex(%ebx), %eax
158 call __lll_mutex_unlock_wake
161 9: /* The futex requeue functionality is not available. */
162 movl $0x7fffffff, %edx
163 movl $FUTEX_WAKE, %ecx
164 movl $SYS_futex, %eax
167 .size __pthread_cond_broadcast, .-__pthread_cond_broadcast
168 versioned_symbol (libpthread, __pthread_cond_broadcast, pthread_cond_broadcast,