diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/i386/i486/pthread_rwlock_timedrdlock.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/i486/pthread_rwlock_timedrdlock.S | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/i486/pthread_rwlock_timedrdlock.S b/sysdeps/unix/sysv/linux/i386/i486/pthread_rwlock_timedrdlock.S new file mode 100644 index 0000000000..bc1001ce9c --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/i486/pthread_rwlock_timedrdlock.S @@ -0,0 +1,243 @@ +/* Copyright (C) 2002-2014 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, see + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> +#include <lowlevellock.h> +#include <lowlevelrwlock.h> +#include <pthread-errnos.h> +#include <kernel-features.h> + + + .text + + .globl pthread_rwlock_timedrdlock + .type pthread_rwlock_timedrdlock,@function + .align 16 +pthread_rwlock_timedrdlock: + cfi_startproc + pushl %esi + cfi_adjust_cfa_offset(4) + pushl %edi + cfi_adjust_cfa_offset(4) + pushl %ebx + cfi_adjust_cfa_offset(4) + pushl %ebp + cfi_adjust_cfa_offset(4) + cfi_offset(%esi, -8) + cfi_offset(%edi, -12) + cfi_offset(%ebx, -16) + cfi_offset(%ebp, -20) + subl $8, %esp + cfi_adjust_cfa_offset(8) + + movl 28(%esp), %ebp + movl 32(%esp), %edi + + /* Get the lock. */ + movl $1, %edx + xorl %eax, %eax + LOCK +#if MUTEX == 0 + cmpxchgl %edx, (%ebp) +#else + cmpxchgl %edx, MUTEX(%ebp) +#endif + jnz 1f + +2: movl WRITER(%ebp), %eax + testl %eax, %eax + jne 14f + cmpl $0, WRITERS_QUEUED(%ebp) + je 5f + cmpb $0, FLAGS(%ebp) + je 5f + + /* Check the value of the timeout parameter. */ +3: cmpl $1000000000, 4(%edi) + jae 19f + + addl $1, READERS_QUEUED(%ebp) + je 4f + + movl READERS_WAKEUP(%ebp), %esi + + LOCK +#if MUTEX == 0 + subl $1, (%ebp) +#else + subl $1, MUTEX(%ebp) +#endif + jne 10f + + /* Get current time. */ +11: movl %esp, %ebx + xorl %ecx, %ecx + movl $__NR_gettimeofday, %eax + ENTER_KERNEL + + /* Compute relative timeout. */ + movl 4(%esp), %eax + movl $1000, %edx + mul %edx /* Milli seconds to nano seconds. */ + movl (%edi), %ecx + movl 4(%edi), %edx + subl (%esp), %ecx + subl %eax, %edx + jns 15f + addl $1000000000, %edx + subl $1, %ecx +15: testl %ecx, %ecx + js 16f /* Time is already up. */ + + /* Futex call. */ + movl %ecx, (%esp) /* Store relative timeout. */ + movl %edx, 4(%esp) + + movl %esi, %edx +#ifdef __ASSUME_PRIVATE_FUTEX + movzbl PSHARED(%ebp), %ecx + xorl $FUTEX_PRIVATE_FLAG|FUTEX_WAIT, %ecx +#else + movzbl PSHARED(%ebp), %ecx +# if FUTEX_WAIT != 0 + orl $FUTEX_WAIT, %ecx +# endif + xorl %gs:PRIVATE_FUTEX, %ecx +#endif + movl %esp, %esi + leal READERS_WAKEUP(%ebp), %ebx + movl $SYS_futex, %eax + ENTER_KERNEL + movl %eax, %esi +17: + + /* Reget the lock. */ + movl $1, %edx + xorl %eax, %eax + LOCK +#if MUTEX == 0 + cmpxchgl %edx, (%ebp) +#else + cmpxchgl %edx, MUTEX(%ebp) +#endif + jnz 12f + +13: subl $1, READERS_QUEUED(%ebp) + cmpl $-ETIMEDOUT, %esi + jne 2b + +18: movl $ETIMEDOUT, %edx + jmp 9f + + +5: xorl %edx, %edx + addl $1, NR_READERS(%ebp) + je 8f +9: LOCK +#if MUTEX == 0 + subl $1, (%ebp) +#else + subl $1, MUTEX(%ebp) +#endif + jne 6f + +7: movl %edx, %eax + + addl $8, %esp + cfi_adjust_cfa_offset(-8) + popl %ebp + cfi_adjust_cfa_offset(-4) + cfi_restore(%ebp) + popl %ebx + cfi_adjust_cfa_offset(-4) + cfi_restore(%ebx) + popl %edi + cfi_adjust_cfa_offset(-4) + cfi_restore(%edi) + popl %esi + cfi_adjust_cfa_offset(-4) + cfi_restore(%esi) + ret + + cfi_adjust_cfa_offset(24) + cfi_offset(%esi, -8) + cfi_offset(%edi, -12) + cfi_offset(%ebx, -16) + cfi_offset(%ebp, -20) +1: +#if MUTEX == 0 + movl %ebp, %edx +#else + leal MUTEX(%ebp), %edx +#endif + movzbl PSHARED(%ebp), %ecx + call __lll_lock_wait + jmp 2b + +14: cmpl %gs:TID, %eax + jne 3b + movl $EDEADLK, %edx + jmp 9b + +6: +#if MUTEX == 0 + movl %ebp, %eax +#else + leal MUTEX(%ebp), %eax +#endif + movzbl PSHARED(%ebp), %ecx + call __lll_unlock_wake + jmp 7b + + /* Overflow. */ +8: subl $1, NR_READERS(%ebp) + movl $EAGAIN, %edx + jmp 9b + + /* Overflow. */ +4: subl $1, READERS_QUEUED(%ebp) + movl $EAGAIN, %edx + jmp 9b + +10: +#if MUTEX == 0 + movl %ebp, %eax +#else + leal MUTEX(%ebp), %eax +#endif + movzbl PSHARED(%ebp), %ecx + call __lll_unlock_wake + jmp 11b + +12: +#if MUTEX == 0 + movl %ebp, %edx +#else + leal MUTEX(%ebp), %edx +#endif + movzbl PSHARED(%ebp), %ecx + call __lll_lock_wait + jmp 13b + +16: movl $-ETIMEDOUT, %esi + jmp 17b + +19: movl $EINVAL, %edx + jmp 9b + cfi_endproc + .size pthread_rwlock_timedrdlock,.-pthread_rwlock_timedrdlock |