227 lines
5.2 KiB
Diff
227 lines
5.2 KiB
Diff
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diff -rup a/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S b/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S
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--- a/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S 2011-12-15 10:45:09.759232551 -0700
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+++ b/nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S 2011-12-15 15:11:57.534479377 -0700
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@@ -137,6 +137,7 @@ __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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@@ -150,6 +151,9 @@ __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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+
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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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@@ -394,6 +398,78 @@ __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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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@@ -566,6 +642,10 @@ __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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diff -rup a/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S b/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S
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--- a/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S 2011-12-15 10:45:09.764232551 -0700
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+++ b/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S 2011-12-15 15:12:49.287474417 -0700
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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 <stap-probe.h>
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#include <kernel-features.h>
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@@ -136,11 +137,14 @@ __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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@@ -327,6 +331,70 @@ __pthread_cond_wait:
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13: movq %r10, %rax
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jmp 14b
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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@@ -479,11 +547,15 @@ __condvar_cleanup1:
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.uleb128 .LcleanupSTART-.LSTARTCODE
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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 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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- .uleb128 0
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+ .uleb128 0
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.Lcstend:
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