From ba8e5eedf5f40091eb67dd391a7dcaf9299db2f5 Mon Sep 17 00:00:00 2001
From: Olivier Goffart <olivier.goffart@nokia.com>
Date: Thu, 3 Feb 2011 14:57:33 +0100
Subject: Implement QThreadData::current using __thread

It slightly faster, and QThreadData::current is used everywhere

Reviewed-by: mread
Reviewed-by: Joao
---
 src/corelib/thread/qthread_unix.cpp | 23 ++++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/src/corelib/thread/qthread_unix.cpp b/src/corelib/thread/qthread_unix.cpp
index 0766447..891ac77 100644
--- a/src/corelib/thread/qthread_unix.cpp
+++ b/src/corelib/thread/qthread_unix.cpp
@@ -110,6 +110,17 @@ QT_BEGIN_NAMESPACE
 
 enum { ThreadPriorityResetFlag = 0x80000000 };
 
+#if defined(Q_OS_LINUX) && defined(__GLIBC__) && (defined(Q_CC_GNU) || defined(Q_CC_INTEL))
+#define HAVE_TLS
+#endif
+#if defined(Q_CC_XLC) || defined (Q_CC_SUN)
+#define HAVE_TLS
+#endif
+
+#ifdef HAVE_TLS
+static __thread QThreadData *currentThreadData = 0;
+#endif
+
 static pthread_once_t current_thread_data_once = PTHREAD_ONCE_INIT;
 static pthread_key_t current_thread_data_key;
 
@@ -157,7 +168,9 @@ Q_DESTRUCTOR_FUNCTION(destroy_current_thread_data_key)
 // that pthread has, so pthread_setspecific is also used.
 static QThreadData *get_thread_data()
 {
-#ifdef Q_OS_SYMBIAN
+#ifdef HAVE_TLS
+    return currentThreadData;
+#elif defined Q_OS_SYMBIAN
     return reinterpret_cast<QThreadData *>(Dll::Tls());
 #else
     pthread_once(&current_thread_data_once, create_current_thread_data_key);
@@ -167,7 +180,9 @@ static QThreadData *get_thread_data()
 
 static void set_thread_data(QThreadData *data)
 {
-#ifdef Q_OS_SYMBIAN
+#ifdef HAVE_TLS
+    currentThreadData = data;
+#elif defined Q_OS_SYMBIAN
     qt_symbian_throwIfError(Dll::SetTls(data));
 #endif
     pthread_once(&current_thread_data_once, create_current_thread_data_key);
@@ -176,7 +191,9 @@ static void set_thread_data(QThreadData *data)
 
 static void clear_thread_data()
 {
-#ifdef Q_OS_SYMBIAN
+#ifdef HAVE_TLS
+    currentThreadData = 0;
+#elif defined Q_OS_SYMBIAN
     Dll::FreeTls();
 #endif
     pthread_setspecific(current_thread_data_key, 0);
-- 
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