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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/public/common/profiling_utils.h"
#include <limits>
#include <memory>
#include <string>
#include "base/base_paths.h"
#include "base/bind.h"
#include "base/clang_profiling_buildflags.h"
#include "base/environment.h"
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/guid.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/rand_util.h"
#include "base/run_loop.h"
#include "base/strings/strcat.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "base/synchronization/waitable_event.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "base/threading/thread_restrictions.h"
#include "build/build_config.h"
namespace content {
base::File OpenProfilingFile() {
base::ScopedAllowBlockingForTesting allows_blocking;
std::unique_ptr<base::Environment> env(base::Environment::Create());
std::string prof_template;
base::FilePath path;
if (env->GetVar("LLVM_PROFILE_FILE", &prof_template)) {
#if defined(OS_WIN)
path = base::FilePath(base::UTF8ToWide(prof_template)).DirName();
#else
path = base::FilePath(prof_template).DirName();
#endif
base::CreateDirectory(path);
} else {
base::PathService::Get(base::DIR_CURRENT, &path);
}
// sajjadm@ and liaoyuke@ experimentally determined that a size 4 pool works
// well for the coverage builder.
// TODO(https://crbug.com/1059335): Check if this is an appropriate value for
// the PGO builds.
int pool_index = base::RandInt(0, 3);
std::string filename = base::StrCat(
{"child_pool-", base::NumberToString(pool_index), ".profraw"});
#if defined(OS_WIN)
path = path.Append(base::UTF8ToWide(filename));
#else
path = path.Append(filename);
#endif
uint32_t flags = base::File::FLAG_OPEN_ALWAYS | base::File::FLAG_READ |
base::File::FLAG_WRITE;
base::File file(path, flags);
if (!file.IsValid()) {
LOG(ERROR) << "Opening file: " << path << " failed with "
<< file.error_details();
}
return file;
}
WaitForProcessesToDumpProfilingInfo::WaitForProcessesToDumpProfilingInfo() =
default;
WaitForProcessesToDumpProfilingInfo::~WaitForProcessesToDumpProfilingInfo() =
default;
void WaitForProcessesToDumpProfilingInfo::WaitForAll() {
base::RunLoop nested_run_loop(base::RunLoop::Type::kNestableTasksAllowed);
// Some of the waitable events will be signaled on the main thread, use a
// nested run loop to ensure we're not preventing them from signaling.
base::ThreadPool::PostTask(
FROM_HERE, {base::MayBlock(), base::TaskShutdownBehavior::BLOCK_SHUTDOWN},
base::BindOnce(
&WaitForProcessesToDumpProfilingInfo::WaitForAllOnThreadPool,
base::Unretained(this), nested_run_loop.QuitClosure()));
nested_run_loop.Run();
}
void WaitForProcessesToDumpProfilingInfo::WaitForAllOnThreadPool(
base::OnceClosure quit_closure) {
base::ScopedAllowBaseSyncPrimitivesOutsideBlockingScope allow_blocking;
std::vector<base::WaitableEvent*> events_raw;
events_raw.reserve(events_.size());
for (const auto& iter : events_)
events_raw.push_back(iter.get());
// Wait for all the events to be signaled.
while (events_raw.size()) {
size_t index =
base::WaitableEvent::WaitMany(events_raw.data(), events_raw.size());
events_raw.erase(events_raw.begin() + index);
}
std::move(quit_closure).Run();
}
base::WaitableEvent*
WaitForProcessesToDumpProfilingInfo::GetNewWaitableEvent() {
events_.push_back(std::make_unique<base::WaitableEvent>());
return events_.back().get();
}
} // namespace content
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