From aefd05f69a1195267f6721abf5ba56f804c0c796 Mon Sep 17 00:00:00 2001
From: Simon Hausmann <simon.hausmann@nokia.com>
Date: Wed, 20 Jun 2012 13:02:56 +0200
Subject: [WIN] Remove dependency on pthread from MachineStackMarker
 https://bugs.webkit.org/show_bug.cgi?id=68429

Patch by Patrick Gansterer <paroga@webkit.org> on 2012-06-13
Reviewed by NOBODY (OOPS!).

Implement pthread TLS functionality with native windows functions.

* heap/MachineStackMarker.cpp: Use the new functions instead of pthread directly.
* heap/MachineStackMarker.h:
* wtf/ThreadSpecific.h:
(WTF::ThreadSpecificKeyCreate): Added wrapper around pthread_key_create.
(WTF::ThreadSpecificKeyDelete): Added wrapper around pthread_key_delete.
(WTF::ThreadSpecificSet): Added wrapper around pthread_setspecific.
(WTF::ThreadSpecificGet): Added wrapper around pthread_getspecific.
* wtf/ThreadSpecificWin.cpp:
---
 Source/WTF/wtf/ThreadSpecificWin.cpp | 90 ++++++++++++++++++++++++++++++++++--
 1 file changed, 86 insertions(+), 4 deletions(-)

(limited to 'Source/WTF/wtf/ThreadSpecificWin.cpp')

diff --git a/Source/WTF/wtf/ThreadSpecificWin.cpp b/Source/WTF/wtf/ThreadSpecificWin.cpp
index d72996a7a..61a594251 100644
--- a/Source/WTF/wtf/ThreadSpecificWin.cpp
+++ b/Source/WTF/wtf/ThreadSpecificWin.cpp
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2009 Jian Li <jianli@chromium.org>
+ * Copyright (C) 2012 Patrick Gansterer <paroga@paroga.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ -19,15 +20,72 @@
  */
 
 #include "config.h"
-
 #include "ThreadSpecific.h"
 
-#if USE(PTHREADS)
-#error This file should not be compiled by ports that do not use Windows native ThreadSpecific implementation.
-#endif
+#include "StdLibExtras.h"
+#include "ThreadingPrimitives.h"
+
+#if !USE(PTHREADS)
 
 namespace WTF {
 
+static Mutex& destructorsMutex()
+{
+    DEFINE_STATIC_LOCAL(Mutex, staticMutex, ());
+    return staticMutex;
+}
+
+class ThreadSpecificKeyValue {
+public:
+    ThreadSpecificKeyValue(void (*destructor)(void *))
+        : m_destructor(destructor)
+    {
+        m_tlsKey = TlsAlloc();
+        if (m_tlsKey == TLS_OUT_OF_INDEXES)
+            CRASH();
+
+        MutexLocker locker(destructorsMutex());
+        m_next = m_first;
+        m_first = this;
+    }
+
+    ~ThreadSpecificKeyValue()
+    {
+        MutexLocker locker(destructorsMutex());
+        ThreadSpecificKeyValue** next = &m_first;
+        while (*next != this) {
+            ASSERT(*next);
+            next = &(*next)->m_next;
+        }
+        *next = (*next)->m_next;
+
+        TlsFree(m_tlsKey);
+    }
+
+    void setValue(void* data) { TlsSetValue(m_tlsKey, data); }
+    void* value() { return TlsGetValue(m_tlsKey); }
+
+    static void callDestructors()
+    {
+        MutexLocker locker(destructorsMutex());
+        ThreadSpecificKeyValue* next = m_first;
+        while (next) {
+            if (void* data = next->value())
+                next->m_destructor(data);
+            next = next->m_next;
+        }
+    }
+
+private:
+    void (*m_destructor)(void *);
+    DWORD m_tlsKey;
+    ThreadSpecificKeyValue* m_next;
+
+    static ThreadSpecificKeyValue* m_first;
+};
+
+ThreadSpecificKeyValue* ThreadSpecificKeyValue::m_first = 0;
+
 long& tlsKeyCount()
 {
     static long count;
@@ -40,6 +98,26 @@ DWORD* tlsKeys()
     return keys;
 }
 
+void ThreadSpecificKeyCreate(ThreadSpecificKey* key, void (*destructor)(void *))
+{
+    *key = new ThreadSpecificKeyValue(destructor);
+}
+
+void ThreadSpecificKeyDelete(ThreadSpecificKey key)
+{
+    delete key;
+}
+
+void ThreadSpecificSet(ThreadSpecificKey key, void* data)
+{
+    key->setValue(data);
+}
+
+void* ThreadSpecificGet(ThreadSpecificKey key)
+{
+    return key->value();
+}
+
 void ThreadSpecificThreadExit()
 {
     for (long i = 0; i < tlsKeyCount(); i++) {
@@ -48,6 +126,10 @@ void ThreadSpecificThreadExit()
         if (data)
             data->destructor(data);
     }
+
+    ThreadSpecificKeyValue::callDestructors();
 }
 
 } // namespace WTF
+
+#endif // !USE(PTHREADS)
-- 
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