diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S')
-rw-r--r-- | nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S b/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S new file mode 100644 index 0000000000..5067345b72 --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S @@ -0,0 +1,119 @@ +/* Copyright (C) 2002, 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. + + 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> + +#ifdef UP +# define LOCK +#else +# define LOCK lock +#endif + +#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 16 +__pthread_cond_signal: + + pushl %esi + pushl %ebx +#if cond_lock != 0 + addl $cond_lock, %ebx +#endif + + movl 12(%esp), %ebx + + /* Get internal lock. */ + movl $1, %eax + LOCK +#if cond_lock == 0 + xaddl %eax, (%ebx) +#else + xaddl %eax, cond_lock(%ebx) +#endif + testl %eax, %eax + jne 1f + +2: movl total_seq+4(%ebx), %eax + movl total_seq(%ebx), %ecx + cmpl wakeup_seq+4(%ebx), %eax + ja 3f + jb 4f + cmpl wakeup_seq(%ebx), %ecx + jbe 4f + + /* Bump the wakeup number. */ +3: addl $1, wakeup_seq(%ebx) + adcl $0, wakeup_seq+4(%ebx) + + /* Wake up one thread. */ + addl $wakeup_seq-cond_lock, %ebx + movl $FUTEX_WAKE, %ecx + xorl %esi, %esi + movl $SYS_futex, %eax + movl %ecx, %edx /* movl $1, %edx */ + ENTER_KERNEL + + subl $wakeup_seq-cond_lock, %ebx + + /* Unlock. */ +4: LOCK +#if cond_lock == 0 + decl (%ebx) +#else + decl cond_lock(%ebx) +#endif + jne 5f + +6: xorl %eax, %eax + popl %ebx + popl %esi + ret + + /* Initial locking failed. */ +1: +#if cond_lock == 0 + movl %ebx, %ecx +#else + leal cond_lock(%ebx), %ecx +#endif + call __lll_mutex_lock_wait + jmp 2b + + /* Unlock in loop requires waekup. */ +5: +#if cond_lock == 0 + movl %ebx, %eax +#else + leal cond_lock(%ebx), %eax +#endif + call __lll_mutex_unlock_wake + jmp 6b + .size __pthread_cond_signal, .-__pthread_cond_signal +versioned_symbol (libpthread, __pthread_cond_signal, pthread_cond_signal, + GLIBC_2_3_2) |