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2022-10-08 17:16:13 -04:00
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6
src/threading/CMakeLists.txt Normal file
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set(JTHREAD_SRCS
${CMAKE_CURRENT_SOURCE_DIR}/event.cpp
${CMAKE_CURRENT_SOURCE_DIR}/thread.cpp
${CMAKE_CURRENT_SOURCE_DIR}/semaphore.cpp
PARENT_SCOPE)

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src/threading/event.cpp Normal file
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/*
This file is a part of the JThread package, which contains some object-
oriented thread wrappers for different thread implementations.
Copyright (c) 2000-2006 Jori Liesenborgs (jori.liesenborgs@gmail.com)
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#include "threading/event.h"
#include "threading/mutex_auto_lock.h"
void Event::wait()
{
MutexAutoLock lock(mutex);
while (!notified) {
cv.wait(lock);
}
notified = false;
}
void Event::signal()
{
MutexAutoLock lock(mutex);
notified = true;
cv.notify_one();
}

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/*
This file is a part of the JThread package, which contains some object-
oriented thread wrappers for different thread implementations.
Copyright (c) 2000-2006 Jori Liesenborgs (jori.liesenborgs@gmail.com)
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#pragma once
#include <condition_variable>
/** A syncronization primitive that will wake up one waiting thread when signaled.
* Calling @c signal() multiple times before a waiting thread has had a chance
* to notice the signal will wake only one thread. Additionally, if no threads
* are waiting on the event when it is signaled, the next call to @c wait()
* will return (almost) immediately.
*/
class Event
{
public:
void wait();
void signal();
private:
std::condition_variable cv;
std::mutex mutex;
bool notified = false;
};

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src/threading/mutex_auto_lock.h Normal file
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/*
This file is a part of the JThread package, which contains some object-
oriented thread wrappers for different thread implementations.
Copyright (c) 2000-2006 Jori Liesenborgs (jori.liesenborgs@gmail.com)
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#pragma once
#include <mutex>
using MutexAutoLock = std::unique_lock<std::mutex>;
using RecursiveMutexAutoLock = std::unique_lock<std::recursive_mutex>;

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src/threading/semaphore.cpp Normal file
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/*
Minetest
Copyright (C) 2013 sapier <sapier AT gmx DOT net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "threading/semaphore.h"
#include <iostream>
#include <cstdlib>
#include <cassert>
#define UNUSED(expr) do { (void)(expr); } while (0)
#ifdef _WIN32
#include <climits>
#define MAX_SEMAPHORE_COUNT LONG_MAX - 1
#else
#include <cerrno>
#include <sys/time.h>
#include <pthread.h>
#if defined(__MACH__) && defined(__APPLE__)
#include <mach/mach.h>
#include <mach/task.h>
#include <mach/semaphore.h>
#include <sys/semaphore.h>
#include <unistd.h>
#undef sem_t
#undef sem_init
#undef sem_wait
#undef sem_post
#undef sem_destroy
#define sem_t semaphore_t
#define sem_init(s, p, c) semaphore_create(mach_task_self(), (s), 0, (c))
#define sem_wait(s) semaphore_wait(*(s))
#define sem_post(s) semaphore_signal(*(s))
#define sem_destroy(s) semaphore_destroy(mach_task_self(), *(s))
#endif
#endif
Semaphore::Semaphore(int val)
{
#ifdef _WIN32
semaphore = CreateSemaphore(NULL, val, MAX_SEMAPHORE_COUNT, NULL);
#else
int ret = sem_init(&semaphore, 0, val);
assert(!ret);
UNUSED(ret);
#endif
}
Semaphore::~Semaphore()
{
#ifdef _WIN32
CloseHandle(semaphore);
#else
int ret = sem_destroy(&semaphore);
#ifdef __ANDROID__
// Workaround for broken bionic semaphore implementation!
assert(!ret || errno == EBUSY);
#else
assert(!ret);
#endif
UNUSED(ret);
#endif
}
void Semaphore::post(unsigned int num)
{
assert(num > 0);
#ifdef _WIN32
ReleaseSemaphore(semaphore, num, NULL);
#else
for (unsigned i = 0; i < num; i++) {
int ret = sem_post(&semaphore);
assert(!ret);
UNUSED(ret);
}
#endif
}
void Semaphore::wait()
{
#ifdef _WIN32
WaitForSingleObject(semaphore, INFINITE);
#else
int ret = sem_wait(&semaphore);
assert(!ret);
UNUSED(ret);
#endif
}
bool Semaphore::wait(unsigned int time_ms)
{
#ifdef _WIN32
unsigned int ret = WaitForSingleObject(semaphore, time_ms);
if (ret == WAIT_OBJECT_0) {
return true;
} else {
assert(ret == WAIT_TIMEOUT);
return false;
}
#else
# if defined(__MACH__) && defined(__APPLE__)
mach_timespec_t wait_time;
wait_time.tv_sec = time_ms / 1000;
wait_time.tv_nsec = 1000000 * (time_ms % 1000);
errno = 0;
int ret = semaphore_timedwait(semaphore, wait_time);
switch (ret) {
case KERN_OPERATION_TIMED_OUT:
errno = ETIMEDOUT;
break;
case KERN_ABORTED:
errno = EINTR;
break;
default:
if (ret)
errno = EINVAL;
}
# else
int ret;
if (time_ms > 0) {
struct timespec wait_time;
struct timeval now;
if (gettimeofday(&now, NULL) == -1) {
std::cerr << "Semaphore::wait(ms): Unable to get time with gettimeofday!" << std::endl;
abort();
}
wait_time.tv_nsec = ((time_ms % 1000) * 1000 * 1000) + (now.tv_usec * 1000);
wait_time.tv_sec = (time_ms / 1000) + (wait_time.tv_nsec / (1000 * 1000 * 1000)) + now.tv_sec;
wait_time.tv_nsec %= 1000 * 1000 * 1000;
ret = sem_timedwait(&semaphore, &wait_time);
} else {
ret = sem_trywait(&semaphore);
}
# endif
assert(!ret || (errno == ETIMEDOUT || errno == EINTR || errno == EAGAIN));
return !ret;
#endif
}

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src/threading/semaphore.h Normal file
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/*
Minetest
Copyright (C) 2013 sapier <sapier AT gmx DOT net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
#if defined(_WIN32)
#include <windows.h>
#elif defined(__MACH__) && defined(__APPLE__)
#include <mach/semaphore.h>
#else
#include <semaphore.h>
#endif
#include "util/basic_macros.h"
class Semaphore
{
public:
Semaphore(int val = 0);
~Semaphore();
DISABLE_CLASS_COPY(Semaphore);
void post(unsigned int num = 1);
void wait();
bool wait(unsigned int time_ms);
private:
#if defined(WIN32)
HANDLE semaphore;
#elif defined(__MACH__) && defined(__APPLE__)
semaphore_t semaphore;
#else
sem_t semaphore;
#endif
};

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/*
This file is a part of the JThread package, which contains some object-
oriented thread wrappers for different thread implementations.
Copyright (c) 2000-2006 Jori Liesenborgs (jori.liesenborgs@gmail.com)
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#include "threading/thread.h"
#include "threading/mutex_auto_lock.h"
#include "log.h"
#include "porting.h"
// for setName
#if defined(__linux__)
#include <sys/prctl.h>
#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
#include <pthread_np.h>
#elif defined(__NetBSD__)
#include <sched.h>
#elif defined(_MSC_VER)
struct THREADNAME_INFO {
DWORD dwType; // Must be 0x1000
LPCSTR szName; // Pointer to name (in user addr space)
DWORD dwThreadID; // Thread ID (-1=caller thread)
DWORD dwFlags; // Reserved for future use, must be zero
};
#endif
// for bindToProcessor
#if __FreeBSD_version >= 702106
typedef cpuset_t cpu_set_t;
#elif defined(__sun) || defined(sun)
#include <sys/types.h>
#include <sys/processor.h>
#include <sys/procset.h>
#elif defined(_AIX)
#include <sys/processor.h>
#include <sys/thread.h>
#elif defined(__APPLE__)
#include <mach/mach_init.h>
#include <mach/thread_act.h>
#endif
Thread::Thread(const std::string &name) :
m_name(name),
m_request_stop(false),
m_running(false)
{
#ifdef _AIX
m_kernel_thread_id = -1;
#endif
}
Thread::~Thread()
{
// kill the thread if running
if (!m_running) {
wait();
} else {
m_running = false;
#if defined(_WIN32)
// See https://msdn.microsoft.com/en-us/library/hh920601.aspx#thread__native_handle_method
TerminateThread((HANDLE) m_thread_obj->native_handle(), 0);
CloseHandle((HANDLE) m_thread_obj->native_handle());
#else
// We need to pthread_kill instead on Android since NDKv5's pthread
// implementation is incomplete.
# ifdef __ANDROID__
pthread_kill(getThreadHandle(), SIGKILL);
# else
pthread_cancel(getThreadHandle());
# endif
wait();
#endif
}
// Make sure start finished mutex is unlocked before it's destroyed
if (m_start_finished_mutex.try_lock())
m_start_finished_mutex.unlock();
}
bool Thread::start()
{
MutexAutoLock lock(m_mutex);
if (m_running)
return false;
m_request_stop = false;
// The mutex may already be locked if the thread is being restarted
m_start_finished_mutex.try_lock();
try {
m_thread_obj = new std::thread(threadProc, this);
} catch (const std::system_error &e) {
return false;
}
while (!m_running)
sleep_ms(1);
// Allow spawned thread to continue
m_start_finished_mutex.unlock();
m_joinable = true;
return true;
}
bool Thread::stop()
{
m_request_stop = true;
return true;
}
bool Thread::wait()
{
MutexAutoLock lock(m_mutex);
if (!m_joinable)
return false;
m_thread_obj->join();
delete m_thread_obj;
m_thread_obj = nullptr;
assert(m_running == false);
m_joinable = false;
return true;
}
bool Thread::getReturnValue(void **ret)
{
if (m_running)
return false;
*ret = m_retval;
return true;
}
void Thread::threadProc(Thread *thr)
{
#ifdef _AIX
thr->m_kernel_thread_id = thread_self();
#endif
thr->setName(thr->m_name);
g_logger.registerThread(thr->m_name);
thr->m_running = true;
// Wait for the thread that started this one to finish initializing the
// thread handle so that getThreadId/getThreadHandle will work.
thr->m_start_finished_mutex.lock();
thr->m_retval = thr->run();
thr->m_running = false;
// Unlock m_start_finished_mutex to prevent data race condition on Windows.
// On Windows with VS2017 build TerminateThread is called and this mutex is not
// released. We try to unlock it from caller thread and it's refused by system.
thr->m_start_finished_mutex.unlock();
g_logger.deregisterThread();
}
void Thread::setName(const std::string &name)
{
#if defined(__linux__)
// It would be cleaner to do this with pthread_setname_np,
// which was added to glibc in version 2.12, but some major
// distributions are still runing 2.11 and previous versions.
prctl(PR_SET_NAME, name.c_str());
#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
pthread_set_name_np(pthread_self(), name.c_str());
#elif defined(__NetBSD__)
pthread_setname_np(pthread_self(), "%s", const_cast<char*>(name.c_str()));
#elif defined(__APPLE__)
pthread_setname_np(name.c_str());
#elif defined(__HAIKU__)
rename_thread(find_thread(NULL), name.c_str());
#elif defined(_MSC_VER)
// Windows itself doesn't support thread names,
// but the MSVC debugger does...
THREADNAME_INFO info;
info.dwType = 0x1000;
info.szName = name.c_str();
info.dwThreadID = -1;
info.dwFlags = 0;
__try {
RaiseException(0x406D1388, 0,
sizeof(info) / sizeof(DWORD), (ULONG_PTR *)&info);
} __except (EXCEPTION_CONTINUE_EXECUTION) {
}
#elif defined(_WIN32) || defined(__GNU__)
// These platforms are known to not support thread names.
// Silently ignore the request.
#else
#warning "Unrecognized platform, thread names will not be available."
#endif
}
unsigned int Thread::getNumberOfProcessors()
{
return std::thread::hardware_concurrency();
}
bool Thread::bindToProcessor(unsigned int proc_number)
{
#if defined(__ANDROID__)
return false;
#elif _MSC_VER
return SetThreadAffinityMask(getThreadHandle(), 1 << proc_number);
#elif __MINGW32__
return SetThreadAffinityMask(pthread_gethandle(getThreadHandle()), 1 << proc_number);
#elif __FreeBSD_version >= 702106 || defined(__linux__) || defined(__DragonFly__)
cpu_set_t cpuset;
CPU_ZERO(&cpuset);
CPU_SET(proc_number, &cpuset);
return pthread_setaffinity_np(getThreadHandle(), sizeof(cpuset), &cpuset) == 0;
#elif defined(__NetBSD__)
cpuset_t *cpuset = cpuset_create();
if (cpuset == NULL)
return false;
int r = pthread_setaffinity_np(getThreadHandle(), cpuset_size(cpuset), cpuset);
cpuset_destroy(cpuset);
return r == 0;
#elif defined(__sun) || defined(sun)
return processor_bind(P_LWPID, P_MYID, proc_number, NULL) == 0
#elif defined(_AIX)
return bindprocessor(BINDTHREAD, m_kernel_thread_id, proc_number) == 0;
#elif defined(__hpux) || defined(hpux)
pthread_spu_t answer;
return pthread_processor_bind_np(PTHREAD_BIND_ADVISORY_NP,
&answer, proc_number, getThreadHandle()) == 0;
#elif defined(__APPLE__)
struct thread_affinity_policy tapol;
thread_port_t threadport = pthread_mach_thread_np(getThreadHandle());
tapol.affinity_tag = proc_number + 1;
return thread_policy_set(threadport, THREAD_AFFINITY_POLICY,
(thread_policy_t)&tapol,
THREAD_AFFINITY_POLICY_COUNT) == KERN_SUCCESS;
#else
return false;
#endif
}
bool Thread::setPriority(int prio)
{
#ifdef _MSC_VER
return SetThreadPriority(getThreadHandle(), prio);
#elif __MINGW32__
return SetThreadPriority(pthread_gethandle(getThreadHandle()), prio);
#else
struct sched_param sparam;
int policy;
if (pthread_getschedparam(getThreadHandle(), &policy, &sparam) != 0)
return false;
int min = sched_get_priority_min(policy);
int max = sched_get_priority_max(policy);
sparam.sched_priority = min + prio * (max - min) / THREAD_PRIORITY_HIGHEST;
return pthread_setschedparam(getThreadHandle(), policy, &sparam) == 0;
#endif
}

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/*
This file is a part of the JThread package, which contains some object-
oriented thread wrappers for different thread implementations.
Copyright (c) 2000-2006 Jori Liesenborgs (jori.liesenborgs@gmail.com)
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#pragma once
#include "util/basic_macros.h"
#include <string>
#include <atomic>
#include <thread>
#include <mutex>
#ifdef _AIX
#include <sys/thread.h> // for tid_t
#endif
#ifdef __HAIKU__
#include <kernel/OS.h>
#endif
/*
* On platforms using pthreads, these five priority classes correlate to
* even divisions between the minimum and maximum reported thread priority.
*/
#if !defined(_WIN32)
#define THREAD_PRIORITY_LOWEST 0
#define THREAD_PRIORITY_BELOW_NORMAL 1
#define THREAD_PRIORITY_NORMAL 2
#define THREAD_PRIORITY_ABOVE_NORMAL 3
#define THREAD_PRIORITY_HIGHEST 4
#endif
class Thread {
public:
Thread(const std::string &name="");
virtual ~Thread();
DISABLE_CLASS_COPY(Thread)
/*
* Begins execution of a new thread at the pure virtual method Thread::run().
* Execution of the thread is guaranteed to have started after this function
* returns.
*/
bool start();
/*
* Requests that the thread exit gracefully.
* Returns immediately; thread execution is guaranteed to be complete after
* a subsequent call to Thread::wait.
*/
bool stop();
/*
* Waits for thread to finish.
* Note: This does not stop a thread, you have to do this on your own.
* Returns false immediately if the thread is not started or has been waited
* on before.
*/
bool wait();
/*
* Returns true if the calling thread is this Thread object.
*/
bool isCurrentThread() { return std::this_thread::get_id() == getThreadId(); }
bool isRunning() { return m_running; }
bool stopRequested() { return m_request_stop; }
std::thread::id getThreadId() { return m_thread_obj->get_id(); }
/*
* Gets the thread return value.
* Returns true if the thread has exited and the return value was available,
* or false if the thread has yet to finish.
*/
bool getReturnValue(void **ret);
/*
* Binds (if possible, otherwise sets the affinity of) the thread to the
* specific processor specified by proc_number.
*/
bool bindToProcessor(unsigned int proc_number);
/*
* Sets the thread priority to the specified priority.
*
* prio can be one of: THREAD_PRIORITY_LOWEST, THREAD_PRIORITY_BELOW_NORMAL,
* THREAD_PRIORITY_NORMAL, THREAD_PRIORITY_ABOVE_NORMAL, THREAD_PRIORITY_HIGHEST.
* On Windows, any of the other priorites as defined by SetThreadPriority
* are supported as well.
*
* Note that it may be necessary to first set the threading policy or
* scheduling algorithm to one that supports thread priorities if not
* supported by default, otherwise this call will have no effect.
*/
bool setPriority(int prio);
/*
* Sets the currently executing thread's name to where supported; useful
* for debugging.
*/
static void setName(const std::string &name);
/*
* Returns the number of processors/cores configured and active on this machine.
*/
static unsigned int getNumberOfProcessors();
protected:
std::string m_name;
virtual void *run() = 0;
private:
std::thread::native_handle_type getThreadHandle()
{ return m_thread_obj->native_handle(); }
static void threadProc(Thread *thr);
void *m_retval = nullptr;
bool m_joinable = false;
std::atomic<bool> m_request_stop;
std::atomic<bool> m_running;
std::mutex m_mutex;
std::mutex m_start_finished_mutex;
std::thread *m_thread_obj = nullptr;
#ifdef _AIX
// For AIX, there does not exist any mapping from pthread_t to tid_t
// available to us, so we maintain one ourselves. This is set on thread start.
tid_t m_kernel_thread_id;
#endif
};