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Handle EAGAIN from FUTEX_WAIT_REQUEUE_PI
This commit is contained in:
Andreas Schwab
parent
9d65ea3a9b
commit
c5a0802a68
@ -1,3 +1,9 @@
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2011-11-28 Andreas Schwab <schwab@redhat.com>
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* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S: Handle
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EAGAIN from FUTEX_WAIT_REQUEUE_PI.
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* sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S: Likewise.
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2011-11-17 Ulrich Drepper <drepper@gmail.com>
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* Makefile.in: Remove CVSOPT handling.
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@ -134,6 +134,7 @@ __pthread_cond_wait:
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cmpl $PI_BIT, %eax
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jne 18f
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90:
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movl $(FUTEX_WAIT_REQUEUE_PI|FUTEX_PRIVATE_FLAG), %ecx
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movl %ebp, %edx
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xorl %esi, %esi
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@ -147,6 +148,9 @@ __pthread_cond_wait:
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sete 16(%esp)
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je 19f
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cmpl $-EAGAIN, %eax
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je 91f
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/* Normal and PI futexes dont mix. Use normal futex functions only
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if the kernel does not support the PI futex functions. */
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cmpl $-ENOSYS, %eax
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@ -391,6 +395,78 @@ __pthread_cond_wait:
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#endif
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call __lll_unlock_wake
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jmp 11b
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91:
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.LcleanupSTART2:
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/* FUTEX_WAIT_REQUEUE_PI returned EAGAIN. We need to
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call it again. */
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/* Get internal lock. */
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movl $1, %edx
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xorl %eax, %eax
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LOCK
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#if cond_lock == 0
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cmpxchgl %edx, (%ebx)
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#else
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cmpxchgl %edx, cond_lock(%ebx)
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#endif
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jz 92f
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#if cond_lock == 0
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movl %ebx, %edx
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#else
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leal cond_lock(%ebx), %edx
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#endif
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#if (LLL_SHARED-LLL_PRIVATE) > 255
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xorl %ecx, %ecx
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#endif
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cmpl $-1, dep_mutex(%ebx)
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setne %cl
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subl $1, %ecx
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andl $(LLL_SHARED-LLL_PRIVATE), %ecx
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#if LLL_PRIVATE != 0
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addl $LLL_PRIVATE, %ecx
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#endif
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call __lll_lock_wait
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92:
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/* Increment the cond_futex value again, so it can be used as a new
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expected value. */
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addl $1, cond_futex(%ebx)
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movl cond_futex(%ebx), %ebp
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/* Unlock. */
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LOCK
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#if cond_lock == 0
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subl $1, (%ebx)
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#else
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subl $1, cond_lock(%ebx)
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#endif
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je 93f
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#if cond_lock == 0
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movl %ebx, %eax
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#else
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leal cond_lock(%ebx), %eax
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#endif
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#if (LLL_SHARED-LLL_PRIVATE) > 255
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xorl %ecx, %ecx
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#endif
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cmpl $-1, dep_mutex(%ebx)
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setne %cl
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subl $1, %ecx
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andl $(LLL_SHARED-LLL_PRIVATE), %ecx
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#if LLL_PRIVATE != 0
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addl $LLL_PRIVATE, %ecx
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#endif
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call __lll_unlock_wake
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93:
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/* Set the rest of SYS_futex args for FUTEX_WAIT_REQUEUE_PI. */
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xorl %ecx, %ecx
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movl dep_mutex(%ebx), %edi
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jmp 90b
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.LcleanupEND2:
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.size __pthread_cond_wait, .-__pthread_cond_wait
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versioned_symbol (libpthread, __pthread_cond_wait, pthread_cond_wait,
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GLIBC_2_3_2)
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@ -563,6 +639,10 @@ __condvar_w_cleanup:
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.long .LcleanupEND-.Lsub_cond_futex
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.long __condvar_w_cleanup-.LSTARTCODE
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.uleb128 0
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.long .LcleanupSTART2-.LSTARTCODE
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.long .LcleanupEND2-.LcleanupSTART2
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.long __condvar_w_cleanup-.LSTARTCODE
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.uleb128 0
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.long .LcallUR-.LSTARTCODE
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.long .LENDCODE-.LcallUR
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.long 0
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@ -23,6 +23,7 @@
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#include <lowlevelcond.h>
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#include <tcb-offsets.h>
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#include <pthread-pi-defines.h>
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#include <pthread-errnos.h>
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#include <kernel-features.h>
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@ -133,11 +134,14 @@ __pthread_cond_wait:
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cmpl $PI_BIT, %eax
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jne 61f
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90:
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movl $(FUTEX_WAIT_REQUEUE_PI|FUTEX_PRIVATE_FLAG), %esi
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movl $SYS_futex, %eax
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syscall
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movl $1, %r8d
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cmpq $-EAGAIN, %rax
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je 91f
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#ifdef __ASSUME_REQUEUE_PI
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jmp 62f
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#else
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@ -324,6 +328,70 @@ __pthread_cond_wait:
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13: movq %r10, %rax
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jmp 14b
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91:
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.LcleanupSTART2:
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/* FUTEX_WAIT_REQUEUE_PI returned EAGAIN. We need to
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call it again. */
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movq 8(%rsp), %rdi
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/* Get internal lock. */
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movl $1, %esi
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xorl %eax, %eax
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LOCK
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#if cond_lock == 0
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cmpxchgl %esi, (%rdi)
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#else
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cmpxchgl %esi, cond_lock(%rdi)
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#endif
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jz 92f
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#if cond_lock != 0
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addq $cond_lock, %rdi
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#endif
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cmpq $-1, dep_mutex-cond_lock(%rdi)
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movl $LLL_PRIVATE, %eax
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movl $LLL_SHARED, %esi
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cmovne %eax, %esi
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callq __lll_lock_wait
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#if cond_lock != 0
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subq $cond_lock, %rdi
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#endif
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92:
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/* Increment the cond_futex value again, so it can be used as a new
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expected value. */
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incl cond_futex(%rdi)
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movl cond_futex(%rdi), %edx
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/* Release internal lock. */
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LOCK
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#if cond_lock == 0
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decl (%rdi)
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#else
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decl cond_lock(%rdi)
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#endif
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jz 93f
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#if cond_lock != 0
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addq $cond_lock, %rdi
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#endif
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cmpq $-1, dep_mutex-cond_lock(%rdi)
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movl $LLL_PRIVATE, %eax
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movl $LLL_SHARED, %esi
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cmovne %eax, %esi
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/* The call preserves %rdx. */
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callq __lll_unlock_wake
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#if cond_lock != 0
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subq $cond_lock, %rdi
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#endif
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93:
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/* Set the rest of SYS_futex args for FUTEX_WAIT_REQUEUE_PI. */
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xorq %r10, %r10
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movq dep_mutex(%rdi), %r8
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leaq cond_futex(%rdi), %rdi
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jmp 90b
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.LcleanupEND2:
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.size __pthread_cond_wait, .-__pthread_cond_wait
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versioned_symbol (libpthread, __pthread_cond_wait, pthread_cond_wait,
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GLIBC_2_3_2)
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@ -477,6 +545,10 @@ __condvar_cleanup1:
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.uleb128 .LcleanupEND-.LcleanupSTART
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.uleb128 __condvar_cleanup1-.LSTARTCODE
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.uleb128 0
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.uleb128 .LcleanupSTART2-.LSTARTCODE
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.uleb128 .LcleanupEND2-.LcleanupSTART2
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.uleb128 __condvar_cleanup1-.LSTARTCODE
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.uleb128 0
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.uleb128 .LcallUR-.LSTARTCODE
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.uleb128 .LENDCODE-.LcallUR
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.uleb128 0
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