JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / heap / BlockAllocator.cpp

diff --git a/heap/BlockAllocator.cpp b/heap/BlockAllocator.cpp
deleted file mode 100644 (file)
index a20ed3e..0000000
--- a/heap/BlockAllocator.cpp
+++ /dev/null
@@ -1,146 +0,0 @@
-/*
- * Copyright (C) 2012 Apple 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:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS 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.
- */
-
-#include "config.h"
-#include "BlockAllocator.h"
-
-#include "MarkedBlock.h"
-#include <wtf/CurrentTime.h>
-
-namespace JSC {
-
-BlockAllocator::BlockAllocator()
-    : m_numberOfFreeBlocks(0)
-    , m_isCurrentlyAllocating(false)
-    , m_blockFreeingThreadShouldQuit(false)
-    , m_blockFreeingThread(GCActivityCallback::s_shouldCreateGCTimer ?
-        createThread(blockFreeingThreadStartFunc, this, "JavaScriptCore::BlockFree") : 0)
-{
-    ASSERT(m_blockFreeingThread || !GCActivityCallback::s_shouldCreateGCTimer);
-}
-
-BlockAllocator::~BlockAllocator()
-{
-    releaseFreeBlocks();
-    {
-        MutexLocker locker(m_freeBlockLock);
-        m_blockFreeingThreadShouldQuit = true;
-        m_freeBlockCondition.broadcast();
-    }
-    if (GCActivityCallback::s_shouldCreateGCTimer)
-        waitForThreadCompletion(m_blockFreeingThread);
-}
-
-void BlockAllocator::releaseFreeBlocks()
-{
-    while (true) {
-        MarkedBlock* block;
-        {
-            MutexLocker locker(m_freeBlockLock);
-            if (!m_numberOfFreeBlocks)
-                block = 0;
-            else {
-                // FIXME: How do we know this is a MarkedBlock? It could be a CopiedBlock.
-                block = static_cast<MarkedBlock*>(m_freeBlocks.removeHead());
-                ASSERT(block);
-                m_numberOfFreeBlocks--;
-            }
-        }
-        
-        if (!block)
-            break;
-        
-        MarkedBlock::destroy(block);
-    }
-}
-
-void BlockAllocator::waitForRelativeTimeWhileHoldingLock(double relative)
-{
-    if (m_blockFreeingThreadShouldQuit)
-        return;
-    m_freeBlockCondition.timedWait(m_freeBlockLock, currentTime() + relative);
-}
-
-void BlockAllocator::waitForRelativeTime(double relative)
-{
-    // If this returns early, that's fine, so long as it doesn't do it too
-    // frequently. It would only be a bug if this function failed to return
-    // when it was asked to do so.
-    
-    MutexLocker locker(m_freeBlockLock);
-    waitForRelativeTimeWhileHoldingLock(relative);
-}
-
-void BlockAllocator::blockFreeingThreadStartFunc(void* blockAllocator)
-{
-    static_cast<BlockAllocator*>(blockAllocator)->blockFreeingThreadMain();
-}
-
-void BlockAllocator::blockFreeingThreadMain()
-{
-    while (!m_blockFreeingThreadShouldQuit) {
-        // Generally wait for one second before scavenging free blocks. This
-        // may return early, particularly when we're being asked to quit.
-        waitForRelativeTime(1.0);
-        if (m_blockFreeingThreadShouldQuit)
-            break;
-        
-        if (m_isCurrentlyAllocating) {
-            m_isCurrentlyAllocating = false;
-            continue;
-        }
-
-        // Now process the list of free blocks. Keep freeing until half of the
-        // blocks that are currently on the list are gone. Assume that a size_t
-        // field can be accessed atomically.
-        size_t currentNumberOfFreeBlocks = m_numberOfFreeBlocks;
-        if (!currentNumberOfFreeBlocks)
-            continue;
-        
-        size_t desiredNumberOfFreeBlocks = currentNumberOfFreeBlocks / 2;
-        
-        while (!m_blockFreeingThreadShouldQuit) {
-            MarkedBlock* block;
-            {
-                MutexLocker locker(m_freeBlockLock);
-                if (m_numberOfFreeBlocks <= desiredNumberOfFreeBlocks)
-                    block = 0;
-                else {
-                    // FIXME: How do we know this is a MarkedBlock? It could be a CopiedBlock.
-                    block = static_cast<MarkedBlock*>(m_freeBlocks.removeHead());
-                    ASSERT(block);
-                    m_numberOfFreeBlocks--;
-                }
-            }
-            
-            if (!block)
-                break;
-            
-            MarkedBlock::destroy(block);
-        }
-    }
-}
-
-} // namespace JSC