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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 #include "config.h"
     32 #include "WTF.h"
     33 
     34 #include "wtf/QuantizedAllocation.h"
     35 
     36 #ifndef NDEBUG
     37 #include "wtf/MainThread.h"
     38 #endif
     39 
     40 namespace WTF {
     41 
     42 extern void initializeThreading();
     43 
     44 bool s_initialized;
     45 bool s_shutdown;
     46 bool Partitions::s_initialized;
     47 PartitionAllocator<4096> Partitions::m_bufferAllocator;
     48 
     49 void initialize(TimeFunction currentTimeFunction, TimeFunction monotonicallyIncreasingTimeFunction)
     50 {
     51     // WTF, and Blink in general, cannot handle being re-initialized, even if shutdown first.
     52     // Make that explicit here.
     53     ASSERT(!s_initialized);
     54     ASSERT(!s_shutdown);
     55     s_initialized = true;
     56     Partitions::initialize();
     57     setCurrentTimeFunction(currentTimeFunction);
     58     setMonotonicallyIncreasingTimeFunction(monotonicallyIncreasingTimeFunction);
     59     initializeThreading();
     60 }
     61 
     62 void shutdown()
     63 {
     64     ASSERT(s_initialized);
     65     ASSERT(!s_shutdown);
     66     s_shutdown = true;
     67     Partitions::shutdown();
     68 }
     69 
     70 bool isShutdown()
     71 {
     72     return s_shutdown;
     73 }
     74 
     75 void Partitions::initialize()
     76 {
     77     static int lock = 0;
     78     // Guard against two threads hitting here in parallel.
     79     spinLockLock(&lock);
     80     if (s_initialized)
     81         return;
     82     s_initialized = true;
     83     spinLockUnlock(&lock);
     84     QuantizedAllocation::init();
     85     m_bufferAllocator.init();
     86 }
     87 
     88 void Partitions::shutdown()
     89 {
     90     m_bufferAllocator.shutdown();
     91 }
     92 
     93 } // namespace WTF
     94