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| author | Ulrich Drepper <drepper@redhat.com> | 2004-10-01 10:33:03 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2004-10-01 10:33:03 +0000 |
| commit | c1b48791e0240ff83a72e54eaeccc04d1077ecaf (patch) | |
| tree | fa2f287092136563ad39e658463da8ee5b37ce9c /nptl/sysdeps | |
| parent | 0da4ee554369b536c554cbc2d50f1abf5e42bdf5 (diff) | |
| download | glibc-c1b48791e0240ff83a72e54eaeccc04d1077ecaf.tar.gz glibc-c1b48791e0240ff83a72e54eaeccc04d1077ecaf.tar.xz glibc-c1b48791e0240ff83a72e54eaeccc04d1077ecaf.zip | |
Update.
2004-10-01 Ulrich Drepper <drepper@redhat.com> * sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S (__lll_mutex_timedlock_wait): I woken but cannot get the lock, make sure 2 is stored in the futex and we looked at the old value. * sysdeps/unix/sysv/linux/x86_64/lowlevellock.S (__lll_mutex_timedlock_wait): Likewise. Fix a few other problems which might very well made the code not working at all before.
Diffstat (limited to 'nptl/sysdeps')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S | 9 | ||||
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S | 18 |
2 files changed, 18 insertions, 9 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S b/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S index 96ea35caac..dc65b709a1 100644 --- a/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S +++ b/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S @@ -132,9 +132,8 @@ __lll_mutex_timedlock_wait: ENTER_KERNEL movl %eax, %ecx -8: +8: /* NB: %edx == 2 */ xorl %eax, %eax - movl $2, %edx LOCK cmpxchgl %edx, (%ebx) @@ -150,6 +149,12 @@ __lll_mutex_timedlock_wait: /* Check whether the time expired. */ 7: cmpl $-ETIMEDOUT, %ecx je 5f + + /* Make sure the current holder knows we are going to sleep. */ + movl %edx, %eax + xchgl %eax, (%ebx) + testl %eax, %eax + jz 6b jmp 1b 3: movl $EINVAL, %eax diff --git a/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S b/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S index cf3dad18fb..6827804f7f 100644 --- a/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S +++ b/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S @@ -95,7 +95,7 @@ __lll_mutex_timedlock_wait: movq %rsp, %rdi xorq %rsi, %rsi movq $VSYSCALL_ADDR_vgettimeofday, %rax - /* This is a regular function call, all calleer-save registers + /* This is a regular function call, all caller-save registers might be clobbered. */ callq *%rax @@ -132,15 +132,13 @@ __lll_mutex_timedlock_wait: syscall movq %rax, %rcx - movl $1, %eax +8: /* NB: %edx == 2 */ + xorl %eax, %eax LOCK cmpxchgl %edx, (%rdi) jnz 7f - movl $2, (%rdi) - xorl %eax, %eax - -8: addq $16, %rsp +6: addq $16, %rsp popq %r14 popq %r13 popq %r12 @@ -151,13 +149,19 @@ __lll_mutex_timedlock_wait: /* Check whether the time expired. */ 7: cmpq $-ETIMEDOUT, %rcx je 5f + + /* Make sure the current holder knows we are going to sleep. */ + movl %edx, %eax + xchgl %eax, (%ebx) + testl %eax, %eax + jz 6b jmp 1b 3: movl $EINVAL, %eax retq 5: movl $ETIMEDOUT, %eax - jmp 8b + jmp 6b .size __lll_mutex_timedlock_wait,.-__lll_mutex_timedlock_wait #endif |