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 | 43 |
1 files changed, 40 insertions, 3 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 013fcc303f..9fc2cbfeaf 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 @@ -22,6 +22,7 @@ #include <lowlevellock.h> #include <lowlevelcond.h> #include <kernel-features.h> +#include <pthread-pi-defines.h> #include <pthread-errnos.h> @@ -86,7 +87,17 @@ __pthread_cond_signal: #endif cmpl $-1, dep_mutex-cond_futex(%ebx) sete %cl - subl $1, %ecx + je 8f + + movl dep_mutex-cond_futex(%ebx), %edx + /* Requeue to a non-robust PI mutex if the PI bit is set and + the robust bit is not set. */ + movl MUTEX_KIND(%edx), %eax + andl $(ROBUST_BIT|PI_BIT), %eax + cmpl $PI_BIT, %eax + je 9f + +8: subl $1, %ecx #ifdef __ASSUME_PRIVATE_FUTEX andl $FUTEX_PRIVATE_FLAG, %ecx #else @@ -124,8 +135,34 @@ __pthread_cond_signal: cfi_restore_state -7: /* %ecx should be either FUTEX_WAKE_OP or - FUTEX_WAKE_OP|FUTEX_PRIVATE_FLAG from the previous syscall. */ +9: movl $(FUTEX_CMP_REQUEUE_PI|FUTEX_PRIVATE_FLAG), %ecx + movl $SYS_futex, %eax + movl $1, %edx + xorl %esi, %esi + movl dep_mutex-cond_futex(%ebx), %edi + movl (%ebx), %ebp + /* FIXME: Until Ingo fixes 4G/4G vDSO, 6 arg syscalls are broken for + sysenter. + ENTER_KERNEL */ + int $0x80 + popl %ebp + popl %esi + + leal -cond_futex(%ebx), %edi + + /* For any kind of error, we try again with WAKE. + The general test also covers running on old kernels. */ + cmpl $-4095, %eax + jb 4f + +7: +#ifdef __ASSUME_PRIVATE_FUTEX + andl $FUTEX_PRIVATE_FLAG, %ecx +#else + andl %gs:PRIVATE_FUTEX, %ecx +#endif + orl $FUTEX_WAKE, %ecx + xorl $(FUTEX_WAKE ^ FUTEX_WAKE_OP), %ecx movl $SYS_futex, %eax /* %edx should be 1 already from $FUTEX_WAKE_OP syscall. |