131 lines
2.5 KiB
ArmAsm
131 lines
2.5 KiB
ArmAsm
/* Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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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 <lowlevelrwlock.h>
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#define SYS_futex 202
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#define FUTEX_WAIT 0
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#define FUTEX_WAKE 1
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#ifndef UP
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# define LOCK lock
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#else
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# define LOCK
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#endif
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.text
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.globl __pthread_rwlock_unlock
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.type __pthread_rwlock_unlock,@function
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.align 16
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__pthread_rwlock_unlock:
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/* Get the lock. */
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movl $1, %esi
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xorl %eax, %eax
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LOCK
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#if MUTEX == 0
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cmpxchgl %esi, (%rdi)
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#else
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cmpxchgl %esi, MUTEX(%rdi)
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#endif
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jnz 1f
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2: cmpl $0, WRITER(%rdi)
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jne 5f
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decl NR_READERS(%rdi)
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jnz 6f
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5: movl $0, WRITER(%rdi)
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movl $1, %esi
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leaq WRITERS_WAKEUP(%rdi), %r10
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movq %rsi, %rdx
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cmpl $0, WRITERS_QUEUED(%rdi)
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jne 0f
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/* If also no readers waiting nothing to do. */
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cmpl $0, READERS_QUEUED(%rdi)
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je 6f
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movl $0x7fffffff, %edx
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leaq READERS_WAKEUP(%rdi), %r10
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0: incl (%r10)
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LOCK
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#if MUTEX == 0
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decl (%rdi)
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#else
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decl MUTEX(%rdi)
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#endif
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jne 7f
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8: movl $SYS_futex, %eax
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movq %r10, %rdi
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syscall
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xorl %eax, %eax
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retq
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.align 16
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6: LOCK
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#if MUTEX == 0
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decl (%rdi)
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#else
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decl MUTEX(%rdi)
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#endif
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jne 3f
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4: xorl %eax, %eax
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retq
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1:
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#if MUTEX != 0
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addq $MUTEX, %rdi
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#endif
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callq __lll_mutex_lock_wait
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#if MUTEX != 0
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subq $MUTEX, %rdi
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#endif
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jmp 2b
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3:
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#if MUTEX != 0
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addq $MUTEX, %rdi
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#endif
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callq __lll_mutex_unlock_wake
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jmp 4b
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7:
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#if MUTEX != 0
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addq $MUTEX, %rdi
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#endif
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callq __lll_mutex_unlock_wake
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jmp 8b
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.size __pthread_rwlock_unlock,.-__pthread_rwlock_unlock
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.globl pthread_rwlock_unlock
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pthread_rwlock_unlock = __pthread_rwlock_unlock
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.globl __pthread_rwlock_unlock_internal
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__pthread_rwlock_unlock_internal = __pthread_rwlock_unlock
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