From a032a6587011cbdac8c2f7e11f15dc4e592bbb55 Mon Sep 17 00:00:00 2001
From: Austin Foxley <austinf@cetoncorp.com>
Date: Tue, 16 Feb 2010 12:27:18 -0800
Subject: mass sync with glibc nptl

Signed-off-by: Austin Foxley <austinf@cetoncorp.com>
---
 .../unix/sysv/linux/x86_64/pthread_cond_signal.S   | 93 ++++++++++++++++++----
 1 file changed, 76 insertions(+), 17 deletions(-)

(limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_signal.S')

diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_signal.S b/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_signal.S
index c7cc3ddd8..568c98470 100644
--- a/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_signal.S
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_signal.S
@@ -1,4 +1,4 @@
-/* Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+/* Copyright (C) 2002-2005, 2007, 2009 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
 
@@ -18,20 +18,11 @@
    02111-1307 USA.  */
 
 #include <sysdep.h>
+#include <lowlevellock.h>
 #include <lowlevelcond.h>
+#include <pthread-pi-defines.h>
 #include <bits/kernel-features.h>
-
-#ifdef UP
-# define LOCK
-#else
-# define LOCK lock
-#endif
-
-#define FUTEX_WAIT		0
-#define FUTEX_WAKE		1
-#define FUTEX_REQUEUE		3
-
-#define EINVAL			22
+#include <pthread-errnos.h>
 
 
 	.text
@@ -64,9 +55,66 @@ __pthread_cond_signal:
 	addl	$1, (%rdi)
 
 	/* Wake up one thread.  */
-	movl	$FUTEX_WAKE, %esi
-	movl	$SYS_futex, %eax
+	cmpq	$-1, dep_mutex(%r8)
+	movl	$FUTEX_WAKE_OP, %esi
 	movl	$1, %edx
+	movl	$SYS_futex, %eax
+	je	8f
+
+	/* Get the address of the mutex used.  */
+	movq    dep_mutex(%r8), %rcx
+	movl	MUTEX_KIND(%rcx), %r11d
+	andl	$(ROBUST_BIT|PI_BIT), %r11d
+	cmpl	$PI_BIT, %r11d
+	je	9f
+
+#ifdef __ASSUME_PRIVATE_FUTEX
+	movl	$(FUTEX_WAKE_OP|FUTEX_PRIVATE_FLAG), %esi
+#else
+	orl	%fs:PRIVATE_FUTEX, %esi
+#endif
+
+8:	movl	$1, %r10d
+#if cond_lock != 0
+	addq	$cond_lock, %r8
+#endif
+	movl	$FUTEX_OP_CLEAR_WAKE_IF_GT_ONE, %r9d
+	syscall
+#if cond_lock != 0
+	subq	$cond_lock, %r8
+#endif
+	/* For any kind of error, we try again with WAKE.
+	   The general test also covers running on old kernels.  */
+	cmpq	$-4095, %rax
+	jae	7f
+
+	xorl	%eax, %eax
+	retq
+
+	/* Wake up one thread and requeue none in the PI Mutex case.  */
+9:	movl	$(FUTEX_CMP_REQUEUE_PI|FUTEX_PRIVATE_FLAG), %esi
+	movq	%rcx, %r8
+	xorq	%r10, %r10
+	movl	(%rdi), %r9d	// XXX Can this be right?
+	syscall
+
+	leaq	-cond_futex(%rdi), %r8
+
+	/* For any kind of error, we try again with WAKE.
+	   The general test also covers running on old kernels.  */
+	cmpq	$-4095, %rax
+	jb	4f
+
+7:
+#ifdef __ASSUME_PRIVATE_FUTEX
+	andl	$FUTEX_PRIVATE_FLAG, %esi
+#else
+	andl	%fs:PRIVATE_FUTEX, %esi
+#endif
+	orl	$FUTEX_WAKE, %esi
+	movl	$SYS_futex, %eax
+	/* %rdx should be 1 already from $FUTEX_WAKE_OP syscall.
+	movl	$1, %edx  */
 	syscall
 
 	/* Unlock.  */
@@ -86,7 +134,11 @@ __pthread_cond_signal:
 #if cond_lock != 0
 	addq	$cond_lock, %rdi
 #endif
-	callq	__lll_mutex_lock_wait
+	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
@@ -95,7 +147,14 @@ __pthread_cond_signal:
 	/* Unlock in loop requires wakeup.  */
 5:
 	movq	%r8, %rdi
-	callq	__lll_mutex_unlock_wake
+#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_unlock_wake
 	jmp	6b
 	.size	__pthread_cond_signal, .-__pthread_cond_signal
 weak_alias(__pthread_cond_signal, pthread_cond_signal)
-- 
cgit v1.2.3