diff options
| author | Ulrich Drepper <drepper@redhat.com> | 2003-03-12 09:53:44 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2003-03-12 09:53:44 +0000 |
| commit | da49194d2d1d19baa603b7e98677377cfb00d8dd (patch) | |
| tree | 172d2557baf2a5882965561f3b71af6503c4f467 /nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_unlock.S | |
| parent | 35e148cb96ec7e34c206c80888f18f52859b8d5f (diff) | |
Update.
* sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_rdlock.S: New file.
* sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_wrlock.S: New file.
* sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_unlock.S: New file.
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_unlock.S')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_unlock.S | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_unlock.S b/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_unlock.S new file mode 100644 index 0000000000..233f609b1e --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_unlock.S @@ -0,0 +1,136 @@ +/* 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 <lowlevelrwlock.h> + + +#define SYS_futex 240 +#define FUTEX_WAIT 0 +#define FUTEX_WAKE 1 + +#ifndef UP +# define LOCK lock +#else +# define LOCK +#endif + + + .text + + .globl __pthread_rwlock_unlock + .type __pthread_rwlock_unlock,@function + .align 16 +__pthread_rwlock_unlock: + /* Get the lock. */ + movl $1, %esi + LOCK +#if MUTEX == 0 + xaddl %esi, (%rdi) +#else + xaddl %esi, MUTEX(%rdi) +#endif + testl %esi, %esi + jne 1f + +2: cmpq $0, WRITER(%rdi) + jne 5f + decl NR_READERS(%rdi) + jnz 6f + +5: movq $0, WRITER(%rdi) + + movq $1, %rsi + leaq WRITERS_WAKEUP(%rdi), %r11 + movq %rsi, %rdx + cmpl $0, WRITERS_QUEUED(%rdi) + jne 0f + + /* If also no readers waiting nothing to do. */ + cmpl $0, READERS_QUEUED(%rdi) + je 6f + + movq $0x7fffffff, %rdx + leaq READERS_WAKEUP(%rdi), %r11 + +0: incl (%r11) + LOCK +#if MUTEX == 0 + decl (%rdi) +#else + decl MUTEX(%rdi) +#endif + jne 7f + +8: movq $SYS_futex, %rax + movq %r11, %rdi + syscall + + xorq %rax, %rax + retq + + .align 16 +6: LOCK +#if MUTEX == 0 + decl (%rdi) +#else + decl MUTEX(%rdi) +#endif + jne 3f + +4: xorq %rax, %rax + retq + +1: +#if MUTEX != 0 + addq $MUTEX, %rdi +#endif + call __lll_mutex_lock_wait +#if MUTEX != 0 + subq $MUTEX, %rdi +#endif + jmp 2b + +3: +#if MUTEX != 0 + addq $MUTEX, %rdi +#endif + call __lll_mutex_unlock_wake +#if MUTEX != 0 + subq $MUTEX, %rdi +#endif + jmp 4b + +7: +#if MUTEX != 0 + addq $MUTEX, %rdi +#endif + call __lll_mutex_unlock_wake +#if MUTEX != 0 + subq $MUTEX, %rdi +#endif + jmp 8b + + .size __pthread_rwlock_unlock,.-__pthread_rwlock_unlock + + .globl pthread_rwlock_unlock +pthread_rwlock_unlock = __pthread_rwlock_unlock + + .globl __pthread_rwlock_unlock_internal +__pthread_rwlock_unlock_internal = __pthread_rwlock_unlock |