167 lines
3.0 KiB
ArmAsm
167 lines
3.0 KiB
ArmAsm
/* Copyright (C) 2002, 2003 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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#include <pthread-errnos.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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#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_wrlock
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.type __pthread_rwlock_wrlock,@function
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.align 16
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__pthread_rwlock_wrlock:
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pushl %esi
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pushl %ebx
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xorl %esi, %esi
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movl 12(%esp), %ebx
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/* Get the lock. */
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movl $1, %edx
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xorl %eax, %eax
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LOCK
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#if MUTEX == 0
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cmpxchgl %edx, (%ebx)
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#else
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cmpxchgl %edx, MUTEX(%ebx)
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#endif
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jnz 1f
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2: movl WRITER(%ebx), %eax
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testl %eax, %eax
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jne 14f
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cmpl $0, NR_READERS(%ebx)
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je 5f
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3: addl $1, WRITERS_QUEUED(%ebx)
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je 4f
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movl WRITERS_WAKEUP(%ebx), %edx
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LOCK
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#if MUTEX == 0
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subl $1, (%ebx)
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#else
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subl $1, MUTEX(%ebx)
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#endif
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jne 10f
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11: addl $WRITERS_WAKEUP, %ebx
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movl %esi, %ecx /* movl $FUTEX_WAIT, %ecx */
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movl $SYS_futex, %eax
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ENTER_KERNEL
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subl $WRITERS_WAKEUP, %ebx
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/* Reget the lock. */
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movl $1, %edx
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xorl %eax, %eax
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LOCK
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#if MUTEX == 0
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cmpxchgl %edx, (%ebx)
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#else
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cmpxchgl %edx, MUTEX(%ebx)
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#endif
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jnz 12f
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13: subl $1, WRITERS_QUEUED(%ebx)
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jmp 2b
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5: xorl %ecx, %ecx
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movl %gs:TID, %eax
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movl %eax, WRITER(%ebx)
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9: LOCK
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#if MUTEX == 0
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subl $1, (%ebx)
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#else
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subl $1, MUTEX(%ebx)
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#endif
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jne 6f
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7:
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movl %ecx, %eax
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popl %ebx
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popl %esi
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ret
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1:
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#if MUTEX == 0
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movl %ebx, %ecx
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#else
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leal MUTEX(%ebx), %ecx
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#endif
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call __lll_mutex_lock_wait
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jmp 2b
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14: cmpl %gs:TID , %eax
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jne 3b
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movl $EDEADLK, %ecx
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jmp 9b
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6:
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#if MUTEX == 0
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movl %ebx, %eax
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#else
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leal MUTEX(%ebx), %eax
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#endif
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call __lll_mutex_unlock_wake
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jmp 7b
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4: subl $1, WRITERS_QUEUED(%ebx)
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movl $EAGAIN, %ecx
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jmp 9b
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10:
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#if MUTEX == 0
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movl %ebx, %eax
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#else
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leal MUTEX(%ebx), %eax
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#endif
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call __lll_mutex_unlock_wake
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jmp 11b
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12:
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#if MUTEX == 0
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movl %ebx, %ecx
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#else
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leal MUTEX(%ebx), %ecx
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#endif
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call __lll_mutex_lock_wait
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jmp 13b
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.size __pthread_rwlock_wrlock,.-__pthread_rwlock_wrlock
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.globl pthread_rwlock_wrlock
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pthread_rwlock_wrlock = __pthread_rwlock_wrlock
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.globl __pthread_rwlock_wrlock_internal
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__pthread_rwlock_wrlock_internal = __pthread_rwlock_wrlock
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