diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_unlock.S')
-rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_unlock.S | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_unlock.S b/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_unlock.S new file mode 100644 index 000000000..cfcc7a18c --- /dev/null +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_unlock.S @@ -0,0 +1,130 @@ +/* Copyright (C) 2002, 2003, 2005, 2007, 2009 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 <lowlevellock.h> +#include <lowlevelrwlock.h> +#include <bits/kernel-features.h> + + + .text + + .globl __pthread_rwlock_unlock + .type __pthread_rwlock_unlock,@function + .align 16 +__pthread_rwlock_unlock: + cfi_startproc + /* 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, %edx + leaq WRITERS_WAKEUP(%rdi), %r10 + 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: +#ifdef __ASSUME_PRIVATE_FUTEX + movl $FUTEX_PRIVATE_FLAG|FUTEX_WAKE, %esi + xorl PSHARED(%rdi), %esi +#else + movl $FUTEX_WAKE, %esi + orl PSHARED(%rdi), %esi + xorl %fs:PRIVATE_FUTEX, %esi +#endif + 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: movl PSHARED(%rdi), %esi +#if MUTEX != 0 + addq $MUTEX, %rdi +#endif + callq __lll_lock_wait +#if MUTEX != 0 + subq $MUTEX, %rdi +#endif + jmp 2b + +3: movl PSHARED(%rdi), %esi +#if MUTEX != 0 + addq $MUTEX, %rdi +#endif + callq __lll_unlock_wake + jmp 4b + +7: movl PSHARED(%rdi), %esi +#if MUTEX != 0 + addq $MUTEX, %rdi +#endif + callq __lll_unlock_wake + jmp 8b + cfi_endproc + .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 |