/* Copyright (C) 2002, 2003, 2005, 2007 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper , 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 #include #include #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: 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 cfi_endproc .size sem_wait,.-sem_wait