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- /* Copyright (C) 2002, 2003, 2005 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 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
- xorl %eax, %eax
- LOCK
- #if MUTEX == 0
- cmpxchgl %esi, (%rdi)
- #else
- cmpxchgl %esi, MUTEX(%rdi)
- #endif
- jnz 1f
- 2: cmpl $0, WRITER(%rdi)
- jne 5f
- decl NR_READERS(%rdi)
- jnz 6f
- 5: movl $0, WRITER(%rdi)
- movl $1, %esi
- leaq WRITERS_WAKEUP(%rdi), %r10
- 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
- movl $0x7fffffff, %edx
- leaq READERS_WAKEUP(%rdi), %r10
- 0: incl (%r10)
- LOCK
- #if MUTEX == 0
- decl (%rdi)
- #else
- decl MUTEX(%rdi)
- #endif
- jne 7f
- 8: movl $SYS_futex, %eax
- movq %r10, %rdi
- syscall
- xorl %eax, %eax
- retq
- .align 16
- 6: LOCK
- #if MUTEX == 0
- decl (%rdi)
- #else
- decl MUTEX(%rdi)
- #endif
- jne 3f
- 4: xorl %eax, %eax
- retq
- 1:
- #if MUTEX != 0
- addq $MUTEX, %rdi
- #endif
- callq __lll_mutex_lock_wait
- #if MUTEX != 0
- subq $MUTEX, %rdi
- #endif
- jmp 2b
- 3:
- #if MUTEX != 0
- addq $MUTEX, %rdi
- #endif
- callq __lll_mutex_unlock_wake
- jmp 4b
- 7:
- #if MUTEX != 0
- addq $MUTEX, %rdi
- #endif
- callq __lll_mutex_unlock_wake
- 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
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