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- /* Copyright (C) 2002, 2003, 2005 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 <shlib-compat.h>
- #include <pthread-errnos.h>
- #ifndef UP
- # define LOCK lock
- #else
- # define
- #endif
- #define SYS_futex 202
- .text
- .globl sem_wait
- .type sem_wait,@function
- .align 16
- cfi_startproc
- sem_wait:
- /* First check for cancellation. */
- movl %fs:CANCELHANDLING, %eax
- andl $0xfffffff9, %eax
- cmpl $8, %eax
- je 4f
- pushq %r12
- cfi_adjust_cfa_offset(8)
- cfi_offset(12, -16)
- pushq %r13
- cfi_adjust_cfa_offset(8)
- movq %rdi, %r13
- cfi_offset(13, -24)
- 3: movl (%r13), %eax
- 2: testl %eax, %eax
- je 1f
- leaq -1(%rax), %rdx
- LOCK
- cmpxchgl %edx, (%r13)
- jne 2b
- xorl %eax, %eax
- popq %r13
- cfi_adjust_cfa_offset(-8)
- cfi_restore(13)
- popq %r12
- cfi_adjust_cfa_offset(-8)
- cfi_restore(12)
- retq
- cfi_adjust_cfa_offset(16)
- cfi_offset(12, -16)
- cfi_offset(13, -24)
- 1: call __pthread_enable_asynccancel
- movl %eax, %r8d
- xorq %r10, %r10
- movl $SYS_futex, %eax
- movq %r13, %rdi
- movq %r10, %rsi
- movq %r10, %rdx
- syscall
- movq %rax, %r12
- movl %r8d, %edi
- call __pthread_disable_asynccancel
- testq %r12, %r12
- je 3b
- cmpq $-EWOULDBLOCK, %r12
- je 3b
- negq %r12
- #if USE___THREAD
- movq errno@gottpoff(%rip), %rdx
- movl %r12d, %fs:(%rdx)
- #else
- callq __errno_location@plt
- movl %r12d, (%rax)
- #endif
- orl $-1, %eax
- popq %r13
- cfi_adjust_cfa_offset(-8)
- cfi_restore(13)
- popq %r12
- cfi_adjust_cfa_offset(-8)
- cfi_restore(12)
- retq
- 4: /* Canceled. */
- movq $0xffffffffffffffff, %fs:RESULT
- LOCK
- orl $0x10, %fs:CANCELHANDLING
- movq %fs:CLEANUP_JMP_BUF, %rdi
- jmp HIDDEN_JUMPTARGET (__pthread_unwind)
- cfi_endproc
- .size sem_wait,.-sem_wait
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