/* Copyright (C) 2002-2005, 2007, 2009 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 #include #include #include /* For the calculation see asm/vsyscall.h. */ #define VSYSCALL_ADDR_vgettimeofday 0xffffffffff600000 .text /* int pthread_cond_timedwait (pthread_cond_t *cond, pthread_mutex_t *mutex, const struct timespec *abstime) */ .globl __pthread_cond_timedwait .type __pthread_cond_timedwait, @function .align 16 __pthread_cond_timedwait: cfi_startproc pushq %r12 cfi_adjust_cfa_offset(8) cfi_rel_offset(%r12, 0) pushq %r13 cfi_adjust_cfa_offset(8) cfi_rel_offset(%r13, 0) pushq %r14 cfi_adjust_cfa_offset(8) cfi_rel_offset(%r14, 0) #define FRAME_SIZE 80 subq $FRAME_SIZE, %rsp cfi_adjust_cfa_offset(FRAME_SIZE) cmpq $1000000000, 8(%rdx) movl $EINVAL, %eax jae 18f /* Stack frame: rsp + 80 +--------------------------+ rsp + 48 | cleanup buffer | +--------------------------+ rsp + 40 | old wake_seq value | +--------------------------+ rsp + 24 | timeout value | +--------------------------+ rsp + 16 | mutex pointer | +--------------------------+ rsp + 8 | condvar pointer | +--------------------------+ rsp + 4 | old broadcast_seq value | +--------------------------+ rsp + 0 | old cancellation mode | +--------------------------+ */ cmpq $-1, dep_mutex(%rdi) /* Prepare structure passed to cancellation handler. */ movq %rdi, 8(%rsp) movq %rsi, 16(%rsp) movq %rdx, %r13 je 22f movq %rsi, dep_mutex(%rdi) /* Get internal lock. */ 22: movl $1, %esi xorl %eax, %eax LOCK #if cond_lock == 0 cmpxchgl %esi, (%rdi) #else cmpxchgl %esi, cond_lock(%rdi) #endif jnz 1f /* Unlock the mutex. */ 2: movq 16(%rsp), %rdi xorl %esi, %esi callq __pthread_mutex_unlock_usercnt testl %eax, %eax jne 16f movq 8(%rsp), %rdi incq total_seq(%rdi) incl cond_futex(%rdi) addl $(1 << nwaiters_shift), cond_nwaiters(%rdi) /* Install cancellation handler. */ #ifdef PIC leaq __condvar_cleanup(%rip), %rsi #else leaq __condvar_cleanup, %rsi #endif leaq 48(%rsp), %rdi movq %rsp, %rdx callq __pthread_cleanup_push /* Get and store current wakeup_seq value. */ movq 8(%rsp), %rdi movq wakeup_seq(%rdi), %r9 movl broadcast_seq(%rdi), %edx movq %r9, 40(%rsp) movl %edx, 4(%rsp) /* Get the current time. */ 8: #ifdef __NR_clock_gettime /* Get the clock number. Note that the field in the condvar structure stores the number minus 1. */ movq 8(%rsp), %rdi movl cond_nwaiters(%rdi), %edi andl $((1 << nwaiters_shift) - 1), %edi /* Only clocks 0 and 1 are allowed so far. Both are handled in the kernel. */ leaq 24(%rsp), %rsi # ifdef SHARED movq __vdso_clock_gettime@GOTPCREL(%rip), %rax movq (%rax), %rax PTR_DEMANGLE (%rax) jz 26f call *%rax jmp 27f # endif 26: movl $__NR_clock_gettime, %eax syscall 27: # ifndef __ASSUME_POSIX_TIMERS cmpq $-ENOSYS, %rax je 19f # endif /* Compute relative timeout. */ movq (%r13), %rcx movq 8(%r13), %rdx subq 24(%rsp), %rcx subq 32(%rsp), %rdx #else leaq 24(%rsp), %rdi xorl %esi, %esi movq $VSYSCALL_ADDR_vgettimeofday, %rax callq *%rax /* Compute relative timeout. */ movq 32(%rsp), %rax movl $1000, %edx mul %rdx /* Milli seconds to nano seconds. */ movq (%r13), %rcx movq 8(%r13), %rdx subq 24(%rsp), %rcx subq %rax, %rdx #endif jns 12f addq $1000000000, %rdx decq %rcx 12: testq %rcx, %rcx movq 8(%rsp), %rdi movq $-ETIMEDOUT, %r14 js 6f /* Store relative timeout. */ 21: movq %rcx, 24(%rsp) movq %rdx, 32(%rsp) movl cond_futex(%rdi), %r12d /* Unlock. */ LOCK #if cond_lock == 0 decl (%rdi) #else decl cond_lock(%rdi) #endif jne 3f 4: callq __pthread_enable_asynccancel movl %eax, (%rsp) leaq 24(%rsp), %r10 cmpq $-1, dep_mutex(%rdi) movq %r12, %rdx #ifdef __ASSUME_PRIVATE_FUTEX movl $FUTEX_WAIT, %eax movl $(FUTEX_WAIT|FUTEX_PRIVATE_FLAG), %esi cmove %eax, %esi #else movl $0, %eax movl %fs:PRIVATE_FUTEX, %esi cmove %eax, %esi # if FUTEX_WAIT != 0 orl $FUTEX_WAIT, %esi # endif #endif addq $cond_futex, %rdi movl $SYS_futex, %eax syscall movq %rax, %r14 movl (%rsp), %edi callq __pthread_disable_asynccancel /* Lock. */ movq 8(%rsp), %rdi movl $1, %esi xorl %eax, %eax LOCK #if cond_lock == 0 cmpxchgl %esi, (%rdi) #else cmpxchgl %esi, cond_lock(%rdi) #endif jne 5f 6: movl broadcast_seq(%rdi), %edx movq woken_seq(%rdi), %rax movq wakeup_seq(%rdi), %r9 cmpl 4(%rsp), %edx jne 23f cmpq 40(%rsp), %r9 jbe 15f cmpq %rax, %r9 ja 9f 15: cmpq $-ETIMEDOUT, %r14 jne 8b 13: incq wakeup_seq(%rdi) incl cond_futex(%rdi) movl $ETIMEDOUT, %r14d jmp 14f 23: xorq %r14, %r14 jmp 24f 9: xorq %r14, %r14 14: incq woken_seq(%rdi) 24: subl $(1 << nwaiters_shift), cond_nwaiters(%rdi) /* Wake up a thread which wants to destroy the condvar object. */ cmpq $0xffffffffffffffff, total_seq(%rdi) jne 25f movl cond_nwaiters(%rdi), %eax andl $~((1 << nwaiters_shift) - 1), %eax jne 25f addq $cond_nwaiters, %rdi cmpq $-1, dep_mutex-cond_nwaiters(%rdi) movl $1, %edx #ifdef __ASSUME_PRIVATE_FUTEX movl $FUTEX_WAKE, %eax movl $(FUTEX_WAKE|FUTEX_PRIVATE_FLAG), %esi cmove %eax, %esi #else movl $0, %eax movl %fs:PRIVATE_FUTEX, %esi cmove %eax, %esi orl $FUTEX_WAKE, %esi #endif movl $SYS_futex, %eax syscall subq $cond_nwaiters, %rdi 25: LOCK #if cond_lock == 0 decl (%rdi) #else decl cond_lock(%rdi) #endif jne 10f /* Remove cancellation handler. */ 11: movq 48+CLEANUP_PREV(%rsp), %rdx movq %rdx, %fs:CLEANUP movq 16(%rsp), %rdi callq __pthread_mutex_cond_lock testq %rax, %rax cmoveq %r14, %rax 18: addq $FRAME_SIZE, %rsp cfi_adjust_cfa_offset(-FRAME_SIZE) popq %r14 cfi_adjust_cfa_offset(-8) cfi_restore(%r14) popq %r13 cfi_adjust_cfa_offset(-8) cfi_restore(%r13) popq %r12 cfi_adjust_cfa_offset(-8) cfi_restore(%r12) retq /* Initial locking failed. */ 1: cfi_adjust_cfa_offset(3 * 8 + FRAME_SIZE) cfi_rel_offset(%r12, FRAME_SIZE + 16) cfi_rel_offset(%r13, FRAME_SIZE + 8) cfi_rel_offset(%r14, FRAME_SIZE) #if cond_lock != 0 addq $cond_lock, %rdi #endif cmpq $-1, dep_mutex-cond_lock(%rdi) movl $LLL_PRIVATE, %eax movl $LLL_SHARED, %esi cmovne %eax, %esi callq __lll_lock_wait jmp 2b /* Unlock in loop requires wakeup. */ 3: #if cond_lock != 0 addq $cond_lock, %rdi #endif cmpq $-1, dep_mutex-cond_lock(%rdi) movl $LLL_PRIVATE, %eax movl $LLL_SHARED, %esi cmovne %eax, %esi callq __lll_unlock_wake jmp 4b /* Locking in loop failed. */ 5: #if cond_lock != 0 addq $cond_lock, %rdi #endif cmpq $-1, dep_mutex-cond_lock(%rdi) movl $LLL_PRIVATE, %eax movl $LLL_SHARED, %esi cmovne %eax, %esi callq __lll_lock_wait #if cond_lock != 0 subq $cond_lock, %rdi #endif jmp 6b /* Unlock after loop requires wakeup. */ 10: #if cond_lock != 0 addq $cond_lock, %rdi #endif cmpq $-1, dep_mutex-cond_lock(%rdi) movl $LLL_PRIVATE, %eax movl $LLL_SHARED, %esi cmovne %eax, %esi callq __lll_unlock_wake jmp 11b /* The initial unlocking of the mutex failed. */ 16: movq 8(%rsp), %rdi movq %rax, (%rsp) LOCK #if cond_lock == 0 decl (%rdi) #else decl cond_lock(%rdi) #endif jne 17f #if cond_lock != 0 addq $cond_lock, %rdi #endif cmpq $-1, dep_mutex-cond_lock(%rdi) movl $LLL_PRIVATE, %eax movl $LLL_SHARED, %esi cmovne %eax, %esi callq __lll_unlock_wake 17: movq (%rsp), %rax jmp 18b #if defined __NR_clock_gettime && !defined __ASSUME_POSIX_TIMERS /* clock_gettime not available. */ 19: leaq 24(%rsp), %rdi xorl %esi, %esi movq $VSYSCALL_ADDR_vgettimeofday, %rax callq *%rax /* Compute relative timeout. */ movq 32(%rsp), %rax movl $1000, %edx mul %rdx /* Milli seconds to nano seconds. */ movq (%r13), %rcx movq 8(%r13), %rdx subq 24(%rsp), %rcx subq %rax, %rdx jns 20f addq $1000000000, %rdx decq %rcx 20: testq %rcx, %rcx movq 8(%rsp), %rdi movq $-ETIMEDOUT, %r14 js 6b jmp 21b #endif cfi_endproc .size __pthread_cond_timedwait, .-__pthread_cond_timedwait versioned_symbol (libpthread, __pthread_cond_timedwait, pthread_cond_timedwait, GLIBC_2_3_2)