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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef WTF_h
     32 #define WTF_h
     33 
     34 #include "wtf/Compiler.h"
     35 #include "wtf/CurrentTime.h"
     36 #include "wtf/PartitionAlloc.h"
     37 #include "wtf/WTFExport.h"
     38 
     39 namespace WTF {
     40 
     41 // This function must be called exactly once from the main thread before using anything else in WTF.
     42 WTF_EXPORT void initialize(TimeFunction currentTimeFunction, TimeFunction monotonicallyIncreasingTimeFunction);
     43 WTF_EXPORT void shutdown();
     44 WTF_EXPORT bool isShutdown();
     45 
     46 class WTF_EXPORT Partitions {
     47 public:
     48     static void initialize();
     49     static void shutdown();
     50     static ALWAYS_INLINE PartitionRootGeneric* getBufferPartition()
     51     {
     52         if (UNLIKELY(!s_initialized))
     53             initialize();
     54         return m_bufferAllocator.root();
     55     }
     56 
     57 private:
     58     static bool s_initialized;
     59     static PartitionAllocatorGeneric m_bufferAllocator;
     60 };
     61 
     62 } // namespace WTF
     63 
     64 #endif // WTF_h
     65