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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() NO_THREAD_SAFETY_ANALYSIS
{
Static::pageheap_lock()->Lock();
for (int i = 0; i < Static::num_size_classes(); ++i)
Static::central_cache()[i].Lock();
}
void CentralCacheUnlockAll() NO_THREAD_SAFETY_ANALYSIS
{
for (int i = 0; i < Static::num_size_classes(); ++i)
Static::central_cache()[i].Unlock();
Static::pageheap_lock()->Unlock();
}
#endif
bool Static::inited_;
SpinLock Static::pageheap_lock_(SpinLock::LINKER_INITIALIZED);
SizeMap Static::sizemap_;
CentralFreeListPadded Static::central_cache_[kClassSizesMax];
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;
Static::PageHeapStorage Static::pageheap_;
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 < num_size_classes(); ++i) {
central_cache_[i].Init(i);
}
new (&pageheap_.memory) PageHeap;
bool aggressive_decommit = tcmalloc::commandlineflags::StringToBool(
TCMallocGetenvSafe("TCMALLOC_AGGRESSIVE_DECOMMIT"), true);
pageheap()->SetAggressiveDecommit(aggressive_decommit);
inited_ = true;
DLL_Init(&sampled_objects_);
}
void Static::InitLateMaybeRecursive() {
#if defined(HAVE_FORK) && defined(HAVE_PTHREAD) \
&& !defined(__APPLE__) && !defined(TCMALLOC_NO_ATFORK)
// OSX has it's own way of handling atfork in malloc (see
// libc_override_osx.h).
//
// For other OSes we do pthread_atfork even if standard seemingly
// discourages pthread_atfork, asking apps to do only
// async-signal-safe calls between fork and exec.
//
// We're deliberately attempting to register atfork handlers as part
// of malloc initialization. So very early. This ensures that our
// handler is called last and that means fork will try to grab
// tcmalloc locks last avoiding possible issues with many other
// locks that are held around calls to malloc. I.e. if we don't do
// that, fork() grabbing malloc lock before such other lock would be
// prone to deadlock, if some other thread holds other lock and
// calls malloc.
//
// We still leave some way of disabling it via
// -DTCMALLOC_NO_ATFORK. It looks like on glibc even with fully
// static binaries malloc is really initialized very early. But I
// can see how combination of static linking and other libc-s could
// be less fortunate and allow some early app constructors to run
// before malloc is ever called.
perftools_pthread_atfork(
CentralCacheLockAll, // parent calls before fork
CentralCacheUnlockAll, // parent calls after fork
CentralCacheUnlockAll); // child calls after fork
#endif
#ifndef NDEBUG
// pthread_atfork above may malloc sometimes. Lets ensure we test
// that malloc works from here.
free(malloc(1));
#endif
}
} // namespace tcmalloc