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glibc
pthread-cond-wait-revert.patch
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File pthread-cond-wait-revert.patch of Package glibc
http://sourceware.org/ml/libc-alpha/2012-01/msg00002.html The following patch: Has been reported as causing numerous problems in Fedora & Debian. I don't think anyone has done any serious analysis of the issue, but the patch has been pulled from both distributions because of the instability it's introduced. https://bugzilla.redhat.com/show_bug.cgi?id=769421 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=651899 commit c5a0802a682dba23f92d47f0f99775aebfbe2539 Author: Andreas Schwab <schwab@redhat.com> Date: Mon Nov 28 13:38:19 2011 +0100 Handle EAGAIN from FUTEX_WAIT_REQUEUE_PI 2011-11-28 Andreas Schwab <schwab@redhat.com> * sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S: Handle EAGAIN from FUTEX_WAIT_REQUEUE_PI. * sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S: Likewise. 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 53970d7..54590b7 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 diff --git a/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S b/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S index 7535baa..d837d15 100644 --- a/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S +++ b/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S @@ -23,6 +23,7 @@ #include <lowlevelcond.h> #include <tcb-offsets.h> #include <pthread-pi-defines.h> +#include <pthread-errnos.h> #include <kernel-features.h> @@ -133,11 +134,14 @@ __pthread_cond_wait: cmpl $PI_BIT, %eax jne 61f +90: movl $(FUTEX_WAIT_REQUEUE_PI|FUTEX_PRIVATE_FLAG), %esi movl $SYS_futex, %eax syscall movl $1, %r8d + cmpq $-EAGAIN, %rax + je 91f #ifdef __ASSUME_REQUEUE_PI jmp 62f #else @@ -324,6 +328,70 @@ __pthread_cond_wait: 13: movq %r10, %rax jmp 14b + +91: +.LcleanupSTART2: + /* FUTEX_WAIT_REQUEUE_PI returned EAGAIN. We need to + call it again. */ + movq 8(%rsp), %rdi + + /* Get internal lock. */ + movl $1, %esi + xorl %eax, %eax + LOCK +#if cond_lock == 0 + cmpxchgl %esi, (%rdi) +#else + cmpxchgl %esi, cond_lock(%rdi) +#endif + jz 92f + +#if cond_lock != 0 + addq $cond_lock, %rdi +#endif + cmpq $-1, dep_mutex-cond_lock(%rdi) + movl $LLL_PRIVATE, %eax + movl $LLL_SHARED, %esi + cmovne %eax, %esi + callq __lll_lock_wait +#if cond_lock != 0 + subq $cond_lock, %rdi +#endif +92: + /* Increment the cond_futex value again, so it can be used as a new + expected value. */ + incl cond_futex(%rdi) + movl cond_futex(%rdi), %edx + + /* Release internal lock. */ + LOCK +#if cond_lock == 0 + decl (%rdi) +#else + decl cond_lock(%rdi) +#endif + jz 93f + +#if cond_lock != 0 + addq $cond_lock, %rdi +#endif + cmpq $-1, dep_mutex-cond_lock(%rdi) + movl $LLL_PRIVATE, %eax + movl $LLL_SHARED, %esi + cmovne %eax, %esi + /* The call preserves %rdx. */ + callq __lll_unlock_wake +#if cond_lock != 0 + subq $cond_lock, %rdi +#endif +93: + /* Set the rest of SYS_futex args for FUTEX_WAIT_REQUEUE_PI. */ + xorq %r10, %r10 + movq dep_mutex(%rdi), %r8 + leaq cond_futex(%rdi), %rdi + jmp 90b +.LcleanupEND2: + .size __pthread_cond_wait, .-__pthread_cond_wait versioned_symbol (libpthread, __pthread_cond_wait, pthread_cond_wait, GLIBC_2_3_2) @@ -476,11 +544,15 @@ __condvar_cleanup1: .uleb128 .LcleanupSTART-.LSTARTCODE .uleb128 .LcleanupEND-.LcleanupSTART .uleb128 __condvar_cleanup1-.LSTARTCODE - .uleb128 0 + .uleb128 0 + .uleb128 .LcleanupSTART2-.LSTARTCODE + .uleb128 .LcleanupEND2-.LcleanupSTART2 + .uleb128 __condvar_cleanup1-.LSTARTCODE + .uleb128 0 .uleb128 .LcallUR-.LSTARTCODE .uleb128 .LENDCODE-.LcallUR .uleb128 0 - .uleb128 0 + .uleb128 0 .Lcstend:
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