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/**
* Copyright (c) 2013, Ford Motor Company
* 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 the Ford Motor Company 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 HOLDER 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.
*/
#ifndef SRC_COMPONENTS_UTILS_INCLUDE_UTILS_THREADS_THREAD_MANAGER_H_
#define SRC_COMPONENTS_UTILS_INCLUDE_UTILS_THREADS_THREAD_MANAGER_H_
#include "utils/threads/thread.h"
#include "utils/lock.h"
#include <map>
#include <string>
#include <set>
#include "utils/macro.h"
#include "utils/singleton.h"
namespace threads {
namespace impl {
/*
* Generates short and unique names for unnamed threads
* and remembers association between thread handle and that short name
*/
class UnnamedThreadRegistry {
public:
UnnamedThreadRegistry();
~UnnamedThreadRegistry();
/*
* Returns a name for given unnamed thread id.
* If id is first seen, new name is generated and memorized
* If id is already known, previously generated name is returned
*/
std::string GetUniqueName(PlatformThreadHandle id);
private:
typedef std::map<PlatformThreadHandle, std::string> IdNameMap;
IdNameMap id_number_;
int32_t last_thread_number_;
sync_primitives::Lock state_lock_;
};
/*
* This class is here currently to remember names associated to threads.
* It manages raw impl::PlatformHandles because Thread::Id's do not provide
* comparison operator. Current linux implementation relies on fact that
* pthread_t is just an integer and every thread has single unique value
* associated with it.
* OS provides it's own facilities to name threads but
*/
class ThreadManager : public utils::Singleton<ThreadManager> {
public:
// Name a thread. Should be called only once for every thread.
// Threads can't be renamed
void RegisterName(PlatformThreadHandle id, const std::string& name);
// Get a name for previously registered thread
std::string GetName(PlatformThreadHandle id) const;
// Forget a name of (possibly destroyed) thread
// Make sure to call it after thread is finished
// Because thread id's can be recycled
void Unregister(PlatformThreadHandle id);
private:
ThreadManager();
~ThreadManager();
private:
typedef std::set<std::string> NamesSet;
typedef std::map<PlatformThreadHandle, std::string> IdNamesMap;
// Set of thread names for fast checking if name is unique
NamesSet names_;
// Map from system handle to the thread name
IdNamesMap id_names_;
mutable sync_primitives::Lock state_lock_;
// Generator of shorter sequental names for unnamed threads
// Has to memorize every generated name this is why it is mutable
mutable UnnamedThreadRegistry unnamed_thread_namer_;
private:
DISALLOW_COPY_AND_ASSIGN(ThreadManager);
FRIEND_BASE_SINGLETON_CLASS(ThreadManager);
};
} // namespace impl
} // namespace threads
#endif // SRC_COMPONENTS_UTILS_INCLUDE_UTILS_THREADS_THREAD_MANAGER_H_
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