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7c37008632
2004-06-13 Kaz Kojima <kkojima@rr.iij4u.or.jp> * sysdeps/unix/sysv/linux/sh/bits/pthreadtypes.h (pthread_cond_t): Add __data.__futex field, reshuffle __data.__clock. * sysdeps/unix/sysv/linux/sh/pthread_cond_signal.S (__pthread_cond_signal): Increment __futex at the same time as __wakeup_seq or __total_seq. Pass address of __futex instead of address of low 32-bits of __wakeup_seq to futex syscall. * sysdeps/unix/sysv/linux/sh/pthread_cond_wait.S (__pthread_cond_wait): Likewise. Pass __futex value from before releasing internal lock to FUTEX_WAIT. * sysdeps/unix/sysv/linux/sh/pthread_cond_timedwait.S (__pthread_cond_timedwait): Likewise. * sysdeps/unix/sysv/linux/sh/pthread_cond_broadcast.S (FUTEX_CMP_REQUEUE): Define. (__pthread_cond_broadcast): Set __futex to 2 * __total_seq. Use FUTEX_CMP_REQUEUE operation instead of FUTEX_REQUEUE. Pass __futex value from before the unlock and __futex address instead of address of low 32-bits of __wakeup_seq to futex syscall. Fallback to FUTEX_WAKE all on any errors.
140 lines
2.8 KiB
ArmAsm
140 lines
2.8 KiB
ArmAsm
/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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#include <shlib-compat.h>
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#include <lowlevelcond.h>
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#include <kernel-features.h>
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#include "lowlevel-atomic.h"
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#define SYS_futex 240
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#define FUTEX_WAIT 0
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#define FUTEX_WAKE 1
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#define FUTEX_REQUEUE 3
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#define EINVAL 22
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.text
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/* int pthread_cond_signal (pthread_cond_t *cond) */
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.globl __pthread_cond_signal
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.type __pthread_cond_signal, @function
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.align 5
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__pthread_cond_signal:
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mov.l r8, @-r15
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sts.l pr, @-r15
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mov r4, r8
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/* Get internal lock. */
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mov #0, r3
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mov #1, r4
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#if cond_lock != 0
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CMPXCHG (r3, @(cond_lock,r8), r4, r2)
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#else
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CMPXCHG (r3, @r8, r4, r2)
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#endif
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bf 1f
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2:
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mov.l @(total_seq+4,r8),r0
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mov.l @(total_seq,r8),r1
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mov.l @(wakeup_seq+4,r8), r2
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cmp/hi r2, r0
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bt 3f
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cmp/hi r0, r2
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bt 4f
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mov.l @(wakeup_seq,r8), r2
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cmp/hi r2, r1
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bf 4f
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3:
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/* Bump the wakeup number. */
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mov #1, r2
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mov #0, r3
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clrt
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mov.l @(wakeup_seq,r8),r0
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mov.l @(wakeup_seq+4,r8),r1
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addc r2, r0
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addc r3, r1
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mov.l r0,@(wakeup_seq,r8)
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mov.l r1,@(wakeup_seq+4,r8)
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mov.l @(cond_futex,r8),r0
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add r2, r0
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mov.l r0,@(cond_futex,r8)
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/* Wake up one thread. */
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mov r8, r4
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add #cond_futex, r4
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mov #FUTEX_WAKE, r5
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mov #1, r6
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mov #0, r7
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mov #SYS_futex, r3
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extu.b r3, r3
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trapa #0x14
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SYSCALL_INST_PAD
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4:
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/* Unlock. */
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#if cond_lock != 0
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DEC (@(cond_lock,r8), r2)
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#else
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DEC (@r8, r2)
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#endif
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tst r2, r2
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bf 5f
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6:
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mov #0, r0
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lds.l @r15+, pr
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rts
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mov.l @r15+, r8
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1:
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/* Initial locking failed. */
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mov r8, r5
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#if cond_lock != 0
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add #cond_lock, r5
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#endif
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mov.l .Lmwait4, r1
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bsrf r1
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mov r2, r4
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.Lmwait4b:
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bra 2b
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nop
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5:
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/* Unlock in loop requires wakeup. */
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mov r8, r4
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#if cond_lock != 0
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add #cond_lock, r4
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#endif
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mov.l .Lmwake4, r1
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bsrf r1
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nop
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.Lmwake4b:
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bra 6b
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nop
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.align 2
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.Lmwait4:
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.long __lll_mutex_lock_wait-.Lmwait4b
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.Lmwake4:
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.long __lll_mutex_unlock_wake-.Lmwake4b
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.size __pthread_cond_signal, .-__pthread_cond_signal
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versioned_symbol (libpthread, __pthread_cond_signal, pthread_cond_signal,
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GLIBC_2_3_2)
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