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126 lines
4.5 KiB
C++
126 lines
4.5 KiB
C++
// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
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// Copyright (c) 2008, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// ---
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// Author: Ken Ashcraft <opensource@google.com>
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#include "config.h"
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#include "static_vars.h"
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#include <stddef.h> // for NULL
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#include <new> // for operator new
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#ifdef HAVE_PTHREAD
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#include <pthread.h> // for pthread_atfork
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#endif
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#include "internal_logging.h" // for CHECK_CONDITION
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#include "common.h"
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#include "sampler.h" // for Sampler
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#include "getenv_safe.h" // TCMallocGetenvSafe
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#include "base/googleinit.h"
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#include "maybe_threads.h"
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namespace tcmalloc {
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#if defined(HAVE_FORK) && defined(HAVE_PTHREAD)
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// These following two functions are registered via pthread_atfork to make
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// sure the central_cache locks remain in a consisten state in the forked
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// version of the thread.
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void CentralCacheLockAll()
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{
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Static::pageheap_lock()->Lock();
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for (int i = 0; i < kNumClasses; ++i)
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Static::central_cache()[i].Lock();
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}
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void CentralCacheUnlockAll()
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{
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for (int i = 0; i < kNumClasses; ++i)
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Static::central_cache()[i].Unlock();
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Static::pageheap_lock()->Unlock();
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}
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#endif
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SpinLock Static::pageheap_lock_(SpinLock::LINKER_INITIALIZED);
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SizeMap Static::sizemap_;
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CentralFreeListPadded Static::central_cache_[kNumClasses];
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PageHeapAllocator<Span> Static::span_allocator_;
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PageHeapAllocator<StackTrace> Static::stacktrace_allocator_;
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Span Static::sampled_objects_;
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PageHeapAllocator<StackTraceTable::Bucket> Static::bucket_allocator_;
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StackTrace* Static::growth_stacks_ = NULL;
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PageHeap* Static::pageheap_ = NULL;
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void Static::InitStaticVars() {
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sizemap_.Init();
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span_allocator_.Init();
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span_allocator_.New(); // Reduce cache conflicts
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span_allocator_.New(); // Reduce cache conflicts
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stacktrace_allocator_.Init();
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bucket_allocator_.Init();
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// Do a bit of sanitizing: make sure central_cache is aligned properly
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CHECK_CONDITION((sizeof(central_cache_[0]) % 64) == 0);
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for (int i = 0; i < kNumClasses; ++i) {
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central_cache_[i].Init(i);
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}
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// It's important to have PageHeap allocated, not in static storage,
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// so that HeapLeakChecker does not consider all the byte patterns stored
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// in is caches as pointers that are sources of heap object liveness,
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// which leads to it missing some memory leaks.
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pageheap_ = new (MetaDataAlloc(sizeof(PageHeap))) PageHeap;
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bool aggressive_decommit =
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tcmalloc::commandlineflags::StringToBool(
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TCMallocGetenvSafe("TCMALLOC_AGGRESSIVE_DECOMMIT"), true);
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pageheap_->SetAggressiveDecommit(aggressive_decommit);
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DLL_Init(&sampled_objects_);
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Sampler::InitStatics();
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}
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#if defined(HAVE_FORK) && defined(HAVE_PTHREAD) && !defined(__APPLE__)
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static inline
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void SetupAtForkLocksHandler()
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{
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perftools_pthread_atfork(
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CentralCacheLockAll, // parent calls before fork
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CentralCacheUnlockAll, // parent calls after fork
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CentralCacheUnlockAll); // child calls after fork
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}
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REGISTER_MODULE_INITIALIZER(tcmalloc_fork_handler, SetupAtForkLocksHandler());
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#endif
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} // namespace tcmalloc
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