diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_timedwrlock.S')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_timedwrlock.S | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_timedwrlock.S b/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_timedwrlock.S new file mode 100644 index 0000000000..a6a02a98a5 --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_timedwrlock.S @@ -0,0 +1,198 @@ +/* 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> +#include <pthread-errnos.h> + + +#define SYS_gettimeofday __NR_gettimeofday +#define SYS_futex 202 +#define FUTEX_WAIT 0 +#define FUTEX_WAKE 1 + +#ifndef UP +# define LOCK lock +#else +# define LOCK +#endif + + + .text + + .globl pthread_rwlock_timedwrlock + .type pthread_rwlock_timedwrlock,@function + .align 16 +pthread_rwlock_timedwrlock: + subq $16, %rsp + + movq %rdi, %r8 + movq %rsi, %r9 + + /* 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: movq WRITER(%r8), %rax + testq %rax, %rax + jne 14f + cmpl $0, NR_READERS(%r8) + je 5f + + /* Check the value of the timeout parameter. */ +3: cmpq $1000000000, 8(%r9) + jae 19f + + incl WRITERS_QUEUED(%r8) + je 4f + + movl WRITERS_WAKEUP(%r8), %edx + + LOCK +#if MUTEX == 0 + decl (%r8) +#else + decl MUTEX(%r8) +#endif + jne 10f + + /* Get current time. */ +11: movq %rsp, %rdi + xorq %rsi, %rsi + movq $SYS_gettimeofday, %rax + syscall + + /* Compute relative timeout. */ + movq 8(%rsp), %rax + movq $1000, %rdi + mul %rdi /* Milli seconds to nano seconds. */ + movq (%r9), %rcx + movq 8(%r9), %rdi + subq (%rsp), %rcx + subq %rax, %rdi + jns 15f + addq $1000000000, %rdi + decq %rcx +15: testq %rcx, %rcx + js 16f /* Time is already up. */ + + /* Futex call. */ + movq %rcx, (%rsp) /* Store relative timeout. */ + movq %rdi, 8(%rsp) + + xorq %rsi, %rsi /* movq $FUTEX_WAIT, %rsi */ + movq %rsp, %r10 + leaq WRITERS_WAKEUP(%r8), %rdi + movq $SYS_futex, %rax + syscall + movq %rax, %rdx +17: + + /* Reget the lock. */ + movl $1, %esi + LOCK +#if MUTEX == 0 + xaddl %esi, (%r8) +#else + xaddl %esi, MUTEX(%r8) +#endif + testl %esi, %esi + jne 12f + +13: decl WRITERS_QUEUED(%r8) + cmpq $-ETIMEDOUT, %rdx + jne 2b + +18: movq $ETIMEDOUT, %rcx + jmp 9f + + +5: xorq %rcx, %rcx + movq %fs:SELF, %rax + movq %rax, WRITER(%r8) +9: LOCK +#if MUTEX == 0 + decl (%r8) +#else + decl MUTEX(%r8) +#endif + jne 6f + +7: movq %rcx, %rax + + addq $16, %rsp + retq + +1: +#if MUTEX != 0 + addq $MUTEX, %rdi +#endif + callq __lll_mutex_lock_wait + jmp 2b + +14: cmpq %fs:SELF, %rax + jne 3b +20: movq $EDEADLK, %rcx + jmp 9b + +6: +#if MUTEX == 0 + movq %r8, %rdi +#else + leal MUTEX(%r8), %rdi +#endif + callq __lll_mutex_unlock_wake + jmp 7b + + /* Overflow. */ +4: decl WRITERS_QUEUED(%r8) + movq $EAGAIN, %rcx + jmp 9b + +10: +#if MUTEX == 0 + movq %r8, %rdi +#else + leaq MUTEX(%r8), %rdi +#endif + callq __lll_mutex_unlock_wake + jmp 11b + +12: +#if MUTEX == 0 + movq %r8, %rdi +#else + leaq MUTEX(%r8), %rdi +#endif + callq __lll_mutex_lock_wait + jmp 13b + +16: movq $-ETIMEDOUT, %rdx + jmp 17b + +19: movq $EINVAL, %rcx + jmp 9b + .size pthread_rwlock_timedwrlock,.-pthread_rwlock_timedwrlock |