diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/x86_64/pthread_barrier_wait.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/pthread_barrier_wait.S | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/pthread_barrier_wait.S b/sysdeps/unix/sysv/linux/x86_64/pthread_barrier_wait.S deleted file mode 100644 index e0f7d6c6e6..0000000000 --- a/sysdeps/unix/sysv/linux/x86_64/pthread_barrier_wait.S +++ /dev/null @@ -1,161 +0,0 @@ -/* Copyright (C) 2002-2015 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, see - <http://www.gnu.org/licenses/>. */ - -#include <sysdep.h> -#include <lowlevellock.h> -#include <lowlevelbarrier.h> - - - .text - - .globl __pthread_barrier_wait - .type __pthread_barrier_wait,@function - .align 16 -__pthread_barrier_wait: - /* Get the mutex. */ - xorl %eax, %eax - movl $1, %esi - LOCK - cmpxchgl %esi, MUTEX(%rdi) - jnz 1f - - /* One less waiter. If this was the last one needed wake - everybody. */ -2: decl LEFT(%rdi) - je 3f - - /* There are more threads to come. */ -#if CURR_EVENT == 0 - movl (%rdi), %edx -#else - movl CURR_EVENT(%rdi), %edx -#endif - - /* Release the mutex. */ - LOCK - decl MUTEX(%rdi) - jne 6f - - /* Wait for the remaining threads. The call will return immediately - if the CURR_EVENT memory has meanwhile been changed. */ -7: -#if FUTEX_WAIT == 0 - movl PRIVATE(%rdi), %esi -#else - movl $FUTEX_WAIT, %esi - orl PRIVATE(%rdi), %esi -#endif - xorq %r10, %r10 -8: movl $SYS_futex, %eax - syscall - - /* Don't return on spurious wakeups. The syscall does not change - any register except %eax so there is no need to reload any of - them. */ -#if CURR_EVENT == 0 - cmpl %edx, (%rdi) -#else - cmpl %edx, CURR_EVENT(%rdi) -#endif - je 8b - - /* Increment LEFT. If this brings the count back to the - initial count unlock the object. */ - movl $1, %edx - movl INIT_COUNT(%rdi), %eax - LOCK - xaddl %edx, LEFT(%rdi) - subl $1, %eax - cmpl %eax, %edx - jne,pt 10f - - /* Release the mutex. We cannot release the lock before - waking the waiting threads since otherwise a new thread might - arrive and gets waken up, too. */ - LOCK - decl MUTEX(%rdi) - jne 9f - -10: xorl %eax, %eax /* != PTHREAD_BARRIER_SERIAL_THREAD */ - - retq - - /* The necessary number of threads arrived. */ -3: -#if CURR_EVENT == 0 - incl (%rdi) -#else - incl CURR_EVENT(%rdi) -#endif - - /* Wake up all waiters. The count is a signed number in the kernel - so 0x7fffffff is the highest value. */ - movl $0x7fffffff, %edx - movl $FUTEX_WAKE, %esi - orl PRIVATE(%rdi), %esi - movl $SYS_futex, %eax - syscall - - /* Increment LEFT. If this brings the count back to the - initial count unlock the object. */ - movl $1, %edx - movl INIT_COUNT(%rdi), %eax - LOCK - xaddl %edx, LEFT(%rdi) - subl $1, %eax - cmpl %eax, %edx - jne,pt 5f - - /* Release the mutex. We cannot release the lock before - waking the waiting threads since otherwise a new thread might - arrive and gets waken up, too. */ - LOCK - decl MUTEX(%rdi) - jne 4f - -5: orl $-1, %eax /* == PTHREAD_BARRIER_SERIAL_THREAD */ - - retq - -1: movl PRIVATE(%rdi), %esi - addq $MUTEX, %rdi - xorl $LLL_SHARED, %esi - callq __lll_lock_wait - subq $MUTEX, %rdi - jmp 2b - -4: movl PRIVATE(%rdi), %esi - addq $MUTEX, %rdi - xorl $LLL_SHARED, %esi - callq __lll_unlock_wake - jmp 5b - -6: movl PRIVATE(%rdi), %esi - addq $MUTEX, %rdi - xorl $LLL_SHARED, %esi - callq __lll_unlock_wake - subq $MUTEX, %rdi - jmp 7b - -9: movl PRIVATE(%rdi), %esi - addq $MUTEX, %rdi - xorl $LLL_SHARED, %esi - callq __lll_unlock_wake - jmp 10b - .size __pthread_barrier_wait,.-__pthread_barrier_wait -weak_alias (__pthread_barrier_wait, pthread_barrier_wait) |