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/* Copyright (C) 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#include <shlib-compat.h>
#include <lowlevelcond.h>
#include "lowlevel-atomic.h"
#define SYS_futex 240
#define FUTEX_WAIT 0
#define FUTEX_WAKE 1
.text
/* int pthread_cond_signal (pthread_cond_t *cond) */
.globl __pthread_cond_signal
.type __pthread_cond_signal, @function
.align 5
__pthread_cond_signal:
mov.l r8, @-r15
sts.l pr, @-r15
mov r4, r8
/* Get internal lock. */
mov #1, r3
#if cond_lock != 0
XADD (r3, @(cond_lock,r8), r2)
#else
XADD (r3, @r8, r2)
#endif
tst r2, r2
bf 1f
2:
mov.l @(total_seq+4,r8),r0
mov.l @(total_seq,r8),r1
mov.l @(wakeup_seq+4,r8), r2
cmp/hi r2, r0
bt 3f
cmp/hi r0, r2
bt 4f
mov.l @(wakeup_seq,r8), r2
cmp/hi r2, r1
bf 4f
3:
/* Bump the wakeup number. */
mov #1, r2
mov #0, r3
clrt
mov.l @(wakeup_seq,r8),r0
mov.l @(wakeup_seq+4,r8),r1
addc r2, r0
addc r3, r1
mov.l r0,@(wakeup_seq,r8)
mov.l r1,@(wakeup_seq+4,r8)
/* Wake up one thread. */
mov r8, r4
add #wakeup_seq, r4
mov #FUTEX_WAKE, r5
mov #1, r6
mov #0, r7
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
4:
/* Unlock. */
#if cond_lock != 0
DEC (@(cond_lock,r8), r2)
#else
DEC (@r8, r2)
#endif
tst r2, r2
bf 5f
6:
mov #0, r0
lds.l @r15+, pr
rts
mov.l @r15+, r8
1:
/* Initial locking failed. */
mov r8, r5
#if cond_lock != 0
add #cond_lock, r5
#endif
mov.l .Lmwait4, r1
bsrf r1
mov r2, r4
.Lmwait4b:
bra 2b
nop
5:
/* Unlock in loop requires wakeup. */
mov r8, r4
#if cond_lock != 0
add #cond_lock, r4
#endif
mov.l .Lmwake4, r1
bsrf r1
nop
.Lmwake4b:
bra 6b
nop
.align 2
.Lmwait4:
.long __lll_mutex_lock_wait-.Lmwait4b
.Lmwake4:
.long __lll_mutex_unlock_wake-.Lmwake4b
.size __pthread_cond_signal, .-__pthread_cond_signal
versioned_symbol (libpthread, __pthread_cond_signal, pthread_cond_signal,
GLIBC_2_3_2)
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