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/* Copyright 2009 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/util/concurrency/thread_name.h"
#include <boost/thread/tss.hpp>
#include "mongo/base/init.h"
#include "mongo/platform/atomic_word.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
using std::string;
namespace {
boost::thread_specific_ptr<std::string> threadName;
AtomicInt64 nextUnnamedThreadId{1};
// It is unsafe to access threadName before its dynamic initialization has completed. Use
// the execution of mongo initializers (which only happens once we have entered main, and
// therefore after dynamic initialization is complete) to signal that it is safe to use
// 'threadName'.
bool mongoInitializersHaveRun{};
MONGO_INITIALIZER(ThreadNameInitializer)(InitializerContext*) {
mongoInitializersHaveRun = true;
// The global initializers should only ever be run from main, so setting thread name
// here makes sense.
setThreadName("main");
return Status::OK();
}
} // namespace
void setThreadName(StringData name) {
invariant(mongoInitializersHaveRun);
threadName.reset(new string(name.toString()));
}
const string& getThreadName() {
if (MONGO_unlikely(!mongoInitializersHaveRun)) {
// 'getThreadName' has been called before dynamic initialization for this
// translation unit has completed, so return a fallback value rather than accessing
// the 'threadName' variable, which requires dynamic initialization. We assume that
// we are in the 'main' thread.
static const std::string kFallback = "main";
return kFallback;
}
std::string* s;
while (!(s = threadName.get())) {
setThreadName(
std::string(str::stream() << "thread" << nextUnnamedThreadId.fetchAndAdd(1)));
}
return *s;
}
} // namespace mongo
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