/* Copyright (C) 2002, 2003 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 /* For the calculation see asm/vsyscall.h. */ #define VSYSCALL_ADDR_vgettimeofday 0xffffffffff600000 .text .globl sem_timedwait .type sem_timedwait,@function .align 16 sem_timedwait: movl (%rdi), %eax 2: testl %eax, %eax je 1f leaq -1(%rax), %rdx LOCK cmpxchgl %edx, (%rdi) jne 2b xorl %eax, %eax retq /* Check whether the timeout value is valid. */ 1: pushq %r12 pushq %r13 subq $16, %rsp movq %rdi, %r12 movq %rsi, %r13 /* Check for invalid nanosecond field. */ cmpq $1000000000, 8(%r13) movl $EINVAL, %eax jae 6f 7: xorq %rsi, %rsi movq %rsp, %rdi movq $VSYSCALL_ADDR_vgettimeofday, %rax callq *%rax /* Compute relative timeout. */ movq 8(%rsp), %rax movq $1000, %rdi mul %rdi /* Milli seconds to nano seconds. */ movq (%r13), %rdi movq 8(%r13), %rdi subq (%rsp), %rdi subq %rax, %rdi jns 5f addq $1000000000, %rsi decq %rdi 5: testq %rdi, %rdi movl $ETIMEDOUT, %eax js 6f /* Time is already up. */ movq %rdi, (%rsp) /* Store relative timeout. */ movq %rsi, 8(%rsp) movq %rsp, %r10 movq %r12, %rdi xorq %rsi, %rsi movq $SYS_futex, %rax xorl %edx, %edx syscall testq %rax, %rax je 9f cmpq $-EWOULDBLOCK, %rax jne 3f 9: movl (%rdi), %eax 8: testl %eax, %eax je 7b leaq -1(%rax), %rcx LOCK cmpxchgl %ecx, (%rdi) jne 8b xorl %eax, %eax 10: addq $16, %rsp popq %r13 popq %r12 retq 3: negq %rax 6: #if USE___THREAD movq errno@gottpoff(%rip), %rdx movl %eax, %fs:(%rdx) #else movl %eax, %edx callq __errno_location@plt movl %edx, (%rax) #endif orl $-1, %eax jmp 10b .size sem_timedwait,.-sem_timedwait