diff options
| author | Andreas Schwab <schwab@redhat.com> | 2011-11-28 13:38:19 +0100 |
|---|---|---|
| committer | Andreas Schwab <schwab@redhat.com> | 2011-11-30 11:03:19 +0100 |
| commit | c5a0802a682dba23f92d47f0f99775aebfbe2539 (patch) | |
| tree | f662acd317fdc5195592161d27ed1fd1ad74d0bc /nptl/sysdeps/unix/sysv/linux/i386 | |
| parent | 9d65ea3a9b83ac3961229ba296a7caf90abce68d (diff) | |
Handle EAGAIN from FUTEX_WAIT_REQUEUE_PI
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/i386')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S b/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S index 53970d755f..54590b7b8b 100644 --- a/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S +++ b/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S @@ -134,6 +134,7 @@ __pthread_cond_wait: cmpl $PI_BIT, %eax jne 18f +90: movl $(FUTEX_WAIT_REQUEUE_PI|FUTEX_PRIVATE_FLAG), %ecx movl %ebp, %edx xorl %esi, %esi @@ -147,6 +148,9 @@ __pthread_cond_wait: sete 16(%esp) je 19f + cmpl $-EAGAIN, %eax + je 91f + /* Normal and PI futexes dont mix. Use normal futex functions only if the kernel does not support the PI futex functions. */ cmpl $-ENOSYS, %eax @@ -391,6 +395,78 @@ __pthread_cond_wait: #endif call __lll_unlock_wake jmp 11b + +91: +.LcleanupSTART2: + /* FUTEX_WAIT_REQUEUE_PI returned EAGAIN. We need to + call it again. */ + + /* Get internal lock. */ + movl $1, %edx + xorl %eax, %eax + LOCK +#if cond_lock == 0 + cmpxchgl %edx, (%ebx) +#else + cmpxchgl %edx, cond_lock(%ebx) +#endif + jz 92f + +#if cond_lock == 0 + movl %ebx, %edx +#else + leal cond_lock(%ebx), %edx +#endif +#if (LLL_SHARED-LLL_PRIVATE) > 255 + xorl %ecx, %ecx +#endif + cmpl $-1, dep_mutex(%ebx) + setne %cl + subl $1, %ecx + andl $(LLL_SHARED-LLL_PRIVATE), %ecx +#if LLL_PRIVATE != 0 + addl $LLL_PRIVATE, %ecx +#endif + call __lll_lock_wait + +92: + /* Increment the cond_futex value again, so it can be used as a new + expected value. */ + addl $1, cond_futex(%ebx) + movl cond_futex(%ebx), %ebp + + /* Unlock. */ + LOCK +#if cond_lock == 0 + subl $1, (%ebx) +#else + subl $1, cond_lock(%ebx) +#endif + je 93f +#if cond_lock == 0 + movl %ebx, %eax +#else + leal cond_lock(%ebx), %eax +#endif +#if (LLL_SHARED-LLL_PRIVATE) > 255 + xorl %ecx, %ecx +#endif + cmpl $-1, dep_mutex(%ebx) + setne %cl + subl $1, %ecx + andl $(LLL_SHARED-LLL_PRIVATE), %ecx +#if LLL_PRIVATE != 0 + addl $LLL_PRIVATE, %ecx +#endif + call __lll_unlock_wake + +93: + /* Set the rest of SYS_futex args for FUTEX_WAIT_REQUEUE_PI. */ + xorl %ecx, %ecx + movl dep_mutex(%ebx), %edi + jmp 90b +.LcleanupEND2: + .size __pthread_cond_wait, .-__pthread_cond_wait versioned_symbol (libpthread, __pthread_cond_wait, pthread_cond_wait, GLIBC_2_3_2) @@ -563,6 +639,10 @@ __condvar_w_cleanup: .long .LcleanupEND-.Lsub_cond_futex .long __condvar_w_cleanup-.LSTARTCODE .uleb128 0 + .long .LcleanupSTART2-.LSTARTCODE + .long .LcleanupEND2-.LcleanupSTART2 + .long __condvar_w_cleanup-.LSTARTCODE + .uleb128 0 .long .LcallUR-.LSTARTCODE .long .LENDCODE-.LcallUR .long 0 |