Squash: Fix bugs

trunk/3rdparty/gperftools-2-fit/src/static_vars.cc

@@ -0,0 +1,152 @@
+// -*- 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_;
+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();
+  // 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;
+
+#if defined(ENABLE_AGGRESSIVE_DECOMMIT_BY_DEFAULT)
+  const bool kDefaultAggressiveDecommit = true;
+#else
+  const bool kDefaultAggressiveDecommit = false;
+#endif
+
+
+  bool aggressive_decommit =
+    tcmalloc::commandlineflags::StringToBool(
+      TCMallocGetenvSafe("TCMALLOC_AGGRESSIVE_DECOMMIT"),
+                         kDefaultAggressiveDecommit);
+
+  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