/* Copyright (C) 2002, 2003, 2004 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 .text #ifndef LOCK # ifdef UP # define LOCK # else # define LOCK lock # endif #endif #define SYS_gettimeofday __NR_gettimeofday #define SYS_futex 240 #define FUTEX_WAIT 0 #define FUTEX_WAKE 1 .globl __lll_mutex_lock_wait .type __lll_mutex_lock_wait,@function .hidden __lll_mutex_lock_wait .align 16 __lll_mutex_lock_wait: pushl %edx pushl %ebx pushl %esi movl $2, %edx movl %ecx, %ebx xorl %esi, %esi /* No timeout. */ xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */ cmpl %edx, %eax /* NB: %edx == 2 */ jne 2f 1: movl $SYS_futex, %eax ENTER_KERNEL 2: movl %edx, %eax xchgl %eax, (%ebx) /* NB: lock is implied */ testl %eax, %eax jnz,pn 1b popl %esi popl %ebx popl %edx ret .size __lll_mutex_lock_wait,.-__lll_mutex_lock_wait #ifdef NOT_IN_libc .globl __lll_mutex_timedlock_wait .type __lll_mutex_timedlock_wait,@function .hidden __lll_mutex_timedlock_wait .align 16 __lll_mutex_timedlock_wait: /* Check for a valid timeout value. */ cmpl $1000000000, 4(%edx) jae 3f pushl %edi pushl %esi pushl %ebx pushl %ebp /* Stack frame for the timespec and timeval structs. */ subl $8, %esp movl %ecx, %ebp movl %edx, %edi 1: /* Get current time. */ movl %esp, %ebx xorl %ecx, %ecx movl $SYS_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 4f addl $1000000000, %edx subl $1, %ecx 4: testl %ecx, %ecx js 5f /* Time is already up. */ /* Store relative timeout. */ movl %ecx, (%esp) movl %edx, 4(%esp) movl %ebp, %ebx movl $1, %eax movl $2, %edx LOCK cmpxchgl %edx, (%ebx) testl %eax, %eax je 8f /* Futex call. */ movl %esp, %esi xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */ movl $SYS_futex, %eax ENTER_KERNEL movl %eax, %ecx 8: xorl %eax, %eax movl $2, %edx LOCK cmpxchgl %edx, (%ebx) jnz 7f 6: addl $8, %esp popl %ebp popl %ebx popl %esi popl %edi ret /* Check whether the time expired. */ 7: cmpl $-ETIMEDOUT, %ecx je 5f jmp 1b 3: movl $EINVAL, %eax ret 5: movl $ETIMEDOUT, %eax jmp 6b .size __lll_mutex_timedlock_wait,.-__lll_mutex_timedlock_wait #endif #ifdef NOT_IN_libc .globl lll_unlock_wake_cb .type lll_unlock_wake_cb,@function .hidden lll_unlock_wake_cb .align 16 lll_unlock_wake_cb: pushl %ebx pushl %ecx pushl %edx movl 20(%esp), %ebx LOCK subl $1, (%ebx) je 1f movl $FUTEX_WAKE, %ecx movl $1, %edx /* Wake one thread. */ movl $SYS_futex, %eax movl $0, (%ebx) ENTER_KERNEL 1: popl %edx popl %ecx popl %ebx ret .size lll_unlock_wake_cb,.-lll_unlock_wake_cb #endif .globl __lll_mutex_unlock_wake .type __lll_mutex_unlock_wake,@function .hidden __lll_mutex_unlock_wake .align 16 __lll_mutex_unlock_wake: pushl %ebx pushl %ecx pushl %edx movl %eax, %ebx movl $0, (%eax) movl $FUTEX_WAKE, %ecx movl $1, %edx /* Wake one thread. */ movl $SYS_futex, %eax ENTER_KERNEL popl %edx popl %ecx popl %ebx ret .size __lll_mutex_unlock_wake,.-__lll_mutex_unlock_wake #ifdef NOT_IN_libc .globl __lll_timedwait_tid .type __lll_timedwait_tid,@function .hidden __lll_timedwait_tid .align 16 __lll_timedwait_tid: pushl %edi pushl %esi pushl %ebx pushl %ebp movl %eax, %ebp movl %edx, %edi subl $8, %esp /* Get current time. */ 2: movl %esp, %ebx xorl %ecx, %ecx movl $SYS_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 5f addl $1000000000, %edx subl $1, %ecx 5: testl %ecx, %ecx js 6f /* Time is already up. */ movl %ecx, (%esp) /* Store relative timeout. */ movl %edx, 4(%esp) movl (%ebp), %edx testl %edx, %edx jz 4f movl %esp, %esi xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */ movl %ebp, %ebx movl $SYS_futex, %eax ENTER_KERNEL cmpl $0, (%ebx) jne 1f 4: xorl %eax, %eax 3: addl $8, %esp popl %ebp popl %ebx popl %esi popl %edi ret 1: cmpl $-ETIMEDOUT, %eax jne 2b 6: movl $ETIMEDOUT, %eax jmp 3b .size __lll_timedwait_tid,.-__lll_timedwait_tid #endif