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- // -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
- // Copyright (c) 2008, 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
- // copyright notice, this list of conditions and the following disclaimer
- // in the documentation and/or other materials provided with the
- // distribution.
- // * Neither the name of Google Inc. nor the names of its
- // contributors may be used to endorse or promote products derived from
- // this software without specific prior written permission.
- //
- // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 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.
- // ---
- // Author: Ken Ashcraft <opensource@google.com>
- #include <config.h>
- #include "static_vars.h"
- #include <stddef.h> // for NULL
- #include <new> // for operator new
- #ifdef HAVE_PTHREAD
- #include <pthread.h> // for pthread_atfork
- #endif
- #include "internal_logging.h" // for CHECK_CONDITION
- #include "common.h"
- #include "sampler.h" // for Sampler
- #include "getenv_safe.h" // TCMallocGetenvSafe
- #include "base/googleinit.h"
- #include "maybe_threads.h"
- namespace tcmalloc {
- #if defined(HAVE_FORK) && defined(HAVE_PTHREAD)
- // These following two functions are registered via pthread_atfork to make
- // sure the central_cache locks remain in a consisten state in the forked
- // version of the thread.
- void CentralCacheLockAll()
- {
- Static::pageheap_lock()->Lock();
- for (int i = 0; i < kNumClasses; ++i)
- Static::central_cache()[i].Lock();
- }
- void CentralCacheUnlockAll()
- {
- for (int i = 0; i < kNumClasses; ++i)
- Static::central_cache()[i].Unlock();
- Static::pageheap_lock()->Unlock();
- }
- #endif
- SpinLock Static::pageheap_lock_(SpinLock::LINKER_INITIALIZED);
- SizeMap Static::sizemap_;
- CentralFreeListPadded Static::central_cache_[kNumClasses];
- PageHeapAllocator<Span> Static::span_allocator_;
- PageHeapAllocator<StackTrace> Static::stacktrace_allocator_;
- Span Static::sampled_objects_;
- PageHeapAllocator<StackTraceTable::Bucket> Static::bucket_allocator_;
- StackTrace* Static::growth_stacks_ = NULL;
- PageHeap* Static::pageheap_ = NULL;
- void Static::InitStaticVars() {
- sizemap_.Init();
- span_allocator_.Init();
- span_allocator_.New(); // Reduce cache conflicts
- span_allocator_.New(); // Reduce cache conflicts
- stacktrace_allocator_.Init();
- bucket_allocator_.Init();
- // Do a bit of sanitizing: make sure central_cache is aligned properly
- CHECK_CONDITION((sizeof(central_cache_[0]) % 64) == 0);
- for (int i = 0; i < kNumClasses; ++i) {
- central_cache_[i].Init(i);
- }
- // It's important to have PageHeap allocated, not in static storage,
- // so that HeapLeakChecker does not consider all the byte patterns stored
- // in is caches as pointers that are sources of heap object liveness,
- // which leads to it missing some memory leaks.
- pageheap_ = new (MetaDataAlloc(sizeof(PageHeap))) PageHeap;
- bool aggressive_decommit =
- tcmalloc::commandlineflags::StringToBool(
- TCMallocGetenvSafe("TCMALLOC_AGGRESSIVE_DECOMMIT"), true);
- pageheap_->SetAggressiveDecommit(aggressive_decommit);
- DLL_Init(&sampled_objects_);
- Sampler::InitStatics();
- }
- #if defined(HAVE_FORK) && defined(HAVE_PTHREAD) && !defined(__APPLE__)
- static inline
- void SetupAtForkLocksHandler()
- {
- perftools_pthread_atfork(
- CentralCacheLockAll, // parent calls before fork
- CentralCacheUnlockAll, // parent calls after fork
- CentralCacheUnlockAll); // child calls after fork
- }
- REGISTER_MODULE_INITIALIZER(tcmalloc_fork_handler, SetupAtForkLocksHandler());
- #endif
- } // namespace tcmalloc
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