diff options
| author | Ulrich Drepper <drepper@redhat.com> | 2003-05-26 02:47:39 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2003-05-26 02:47:39 +0000 |
| commit | 69431c9a21f7393f34330a27df1630520930789e (patch) | |
| tree | 1fbd3f1520502c833e676afa3fb5410f92654f85 /nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S | |
| parent | 6a998b09ec734d8dd40e690244122a43bf9d7a16 (diff) | |
Update.
2003-05-25 Ulrich Drepper <drepper@redhat.com>
* sysdeps/unix/sysv/linux/kernel-features.h: Define
__ASSUME_FUTEX_REQUEUE for >= 2.5.70.
* math/test-fenv.c (feexcp_nomask_test): Fix comment.
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 | 55 |
1 files changed, 43 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 5465d7b2a8..ed25c554d2 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 @@ -20,6 +20,7 @@ #include <sysdep.h> #include <shlib-compat.h> #include <lowlevelcond.h> +#include <kernel-features.h> #ifdef UP # define LOCK @@ -30,6 +31,9 @@ #define SYS_futex 240 #define FUTEX_WAIT 0 #define FUTEX_WAKE 1 +#define FUTEX_REQUEUE 3 + +#define EINVAL 22 .text @@ -41,23 +45,25 @@ __pthread_cond_signal: pushl %ebx + pushl %esi + pushl %edi - movl 8(%esp), %ebx + movl 16(%esp), %edi /* Get internal lock. */ movl $1, %eax LOCK #if cond_lock == 0 - xaddl %eax, (%ebx) + xaddl %eax, (%edi) #else - xaddl %eax, cond_lock(%ebx) + xaddl %eax, cond_lock(%edi) #endif testl %eax, %eax jne 1f -2: addl $wakeup_seq, %ebx - movl total_seq+4-wakeup_seq(%ebx), %eax - movl total_seq-wakeup_seq(%ebx), %ecx +2: leal wakeup_seq(%edi), %ebx + movl total_seq+4(%edi), %eax + movl total_seq(%edi), %ecx cmpl 4(%ebx), %eax ja 3f jb 4f @@ -68,18 +74,30 @@ __pthread_cond_signal: 3: addl $1, (%ebx) adcl $0, 4(%ebx) - /* Wake up one thread. */ - movl $FUTEX_WAKE, %ecx + /* Wake up one thread by moving it to the internal lock futex. */ + movl $FUTEX_REQUEUE, %ecx movl $SYS_futex, %eax - movl %ecx, %edx /* movl $1, %edx */ + xorl %edx, %edx + movl $1, %esi ENTER_KERNEL +#ifndef __ASSUME_FUTEX_REQUEUE + cmpl $-EINVAL, %eax + je 7f +#endif + + /* If we moved a thread we in any case have to make the syscall. */ + testl %eax, %eax + jne 5f + /* Unlock. */ 4: LOCK - subl $1, cond_lock-wakeup_seq(%ebx) + subl $1, (%edi) jne 5f 6: xorl %eax, %eax + popl %edi + popl %esi popl %ebx ret @@ -93,11 +111,24 @@ __pthread_cond_signal: call __lll_mutex_lock_wait jmp 2b - /* Unlock in loop requires waekup. */ + /* Unlock in loop requires wakeup. */ 5: - leal cond_lock-wakeup_seq(%ebx), %eax +#if cond_lock == 0 + movl %edi, %eax +#else + leal cond_lock(%edi), %eax +#endif call __lll_mutex_unlock_wake jmp 6b + +#ifndef __ASSUME_FUTEX_REQUEUE +7: /* The futex requeue functionality is not available. */ + movl $1, %edx + movl $FUTEX_WAKE, %ecx + movl $SYS_futex, %eax + ENTER_KERNEL + jmp 4b +#endif .size __pthread_cond_signal, .-__pthread_cond_signal versioned_symbol (libpthread, __pthread_cond_signal, pthread_cond_signal, GLIBC_2_3_2) |