diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S | 47 |
1 files changed, 35 insertions, 12 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S b/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S index 3c5a1db59c..d0f931ff15 100644 --- a/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S +++ b/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S @@ -1,4 +1,4 @@ -/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc. +/* Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. @@ -31,7 +31,9 @@ #define SYS_futex 240 #define FUTEX_WAIT 0 #define FUTEX_WAKE 1 -#define FUTEX_REQUEUE 3 +#define FUTEX_WAKE_OP 5 + +#define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE ((4 << 24) | 1) #define EINVAL 22 @@ -79,21 +81,46 @@ __pthread_cond_signal: addl $1, (%ebx) /* Wake up one thread. */ - movl $FUTEX_WAKE, %ecx + pushl %esi + pushl %ebp + movl $FUTEX_WAKE_OP, %ecx movl $SYS_futex, %eax movl $1, %edx + movl $1, %esi + movl $FUTEX_OP_CLEAR_WAKE_IF_GT_ONE, %ebp + /* FIXME: Until Ingo fixes 4G/4G vDSO, 6 arg syscalls are broken for + sysenter. + ENTER_KERNEL */ + int $0x80 + popl %ebp + popl %esi + + /* For any kind of error, we try again with WAKE. + The general test also covers running on old kernels. */ + cmpl $-4095, %eax + jae 7f + +6: xorl %eax, %eax + popl %edi + popl %ebx + ret + +7: movl $FUTEX_WAKE, %ecx + movl $SYS_futex, %eax + /* %edx should be 1 already from $FUTEX_WAKE_OP syscall. + movl $1, %edx */ ENTER_KERNEL /* Unlock. Note that at this point %edi always points to cond_lock. */ 4: LOCK subl $1, (%edi) - jne 5f + je 6b -6: xorl %eax, %eax - popl %edi - popl %ebx - ret + /* Unlock in loop requires wakeup. */ +5: movl %edi, %eax + call __lll_mutex_unlock_wake + jmp 6b /* Initial locking failed. */ 1: @@ -105,10 +132,6 @@ __pthread_cond_signal: call __lll_mutex_lock_wait jmp 2b - /* Unlock in loop requires wakeup. */ -5: movl %edi, %eax - call __lll_mutex_unlock_wake - jmp 6b .size __pthread_cond_signal, .-__pthread_cond_signal versioned_symbol (libpthread, __pthread_cond_signal, pthread_cond_signal, GLIBC_2_3_2) |