Enhancements to PartitionAlloc to support threading and arbitrary allocation sizes.

Source/wtf/SpinLock.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 10 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef WTFTestHelpers_h
-#define WTFTestHelpers_h
+#ifndef WTF_SpinLock_h
+#define WTF_SpinLock_h
 
-#include "wtf/text/CString.h"
-#include "wtf/text/WTFString.h"
+// DESCRIPTION
+// spinLockLock() and spinLockUnlock() are simple spinlock primitives based on
+// the standard CPU primitive of atomic increment and decrement of an int at
+// a given memory address.
 
-#include <ostream> // NOLINT
+#include "wtf/Atomics.h"
 
 namespace WTF {
 
-// Output stream operator so gTest's macros work with WebCore strings.
-static std::ostream& operator<<(std::ostream& out, const String& str)
+ALWAYS_INLINE void spinLockLock(int volatile* lock)
 {
-    return str.isEmpty() ? out : out << str.utf8().data();
+    while (atomicIncrement(lock) != 1)
+        atomicDecrement(lock);
 }
 
-// Output stream operator so gtest can print WTF::CString.
-static std::ostream& operator<<(std::ostream& out, const CString& str)
+ALWAYS_INLINE void spinLockUnlock(int volatile* lock)
 {
-    return out << str.data();
+    atomicDecrement(lock);
 }
 
 } // namespace WTF
 
+using WTF::spinLockLock;
+using WTF::spinLockUnlock;
 
-#endif // WTFTestHelpers_h
+#endif // WTF_PartitionAlloc_h