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/* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD 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 General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file thread_pthread.cpp POSIX pthread implementation of Threads. */
#include "../stdafx.h"
#include "thread.h"
#include <pthread.h>
#include <errno.h>
#if defined(__APPLE__)
#include "../os/macosx/macos.h"
#endif
#include "../safeguards.h"
/**
* POSIX pthread version for ThreadObject.
*/
class ThreadObject_pthread : public ThreadObject {
private:
pthread_t thread; ///< System thread identifier.
OTTDThreadFunc proc; ///< External thread procedure.
void *param; ///< Parameter for the external thread procedure.
bool self_destruct; ///< Free ourselves when done?
const char *name; ///< Name for the thread
public:
/**
* Create a pthread and start it, calling proc(param).
*/
ThreadObject_pthread(OTTDThreadFunc proc, void *param, bool self_destruct, const char *name) :
thread(0),
proc(proc),
param(param),
self_destruct(self_destruct),
name(name)
{
pthread_create(&this->thread, NULL, &stThreadProc, this);
}
/* virtual */ bool Exit()
{
assert(pthread_self() == this->thread);
/* For now we terminate by throwing an error, gives much cleaner cleanup */
throw OTTDThreadExitSignal();
}
/* virtual */ void Join()
{
/* You cannot join yourself */
assert(pthread_self() != this->thread);
pthread_join(this->thread, NULL);
this->thread = 0;
}
private:
/**
* On thread creation, this function is called, which calls the real startup
* function. This to get back into the correct instance again.
*/
static void *stThreadProc(void *thr)
{
ThreadObject_pthread *self = (ThreadObject_pthread *) thr;
#if defined(__GLIBC__)
#if __GLIBC_PREREQ(2, 12)
if (self->name) {
pthread_setname_np(pthread_self(), self->name);
}
#endif
#endif
#if defined(__APPLE__)
MacOSSetThreadName(self->name);
#endif
self->ThreadProc();
pthread_exit(NULL);
}
/**
* A new thread is created, and this function is called. Call the custom
* function of the creator of the thread.
*/
void ThreadProc()
{
/* Call the proc of the creator to continue this thread */
try {
this->proc(this->param);
} catch (OTTDThreadExitSignal) {
} catch (...) {
NOT_REACHED();
}
if (self_destruct) {
pthread_detach(pthread_self());
delete this;
}
}
};
/* static */ bool ThreadObject::New(OTTDThreadFunc proc, void *param, ThreadObject **thread, const char *name)
{
ThreadObject *to = new ThreadObject_pthread(proc, param, thread == NULL, name);
if (thread != NULL) *thread = to;
return true;
}
/**
* POSIX pthread version of ThreadMutex.
*/
class ThreadMutex_pthread : public ThreadMutex {
private:
pthread_mutex_t mutex; ///< The actual mutex.
pthread_cond_t condition; ///< Data for conditional waiting.
pthread_mutexattr_t attr; ///< Attributes set for the mutex.
pthread_t owner; ///< Owning thread of the mutex.
uint recursive_count; ///< Recursive lock count.
public:
ThreadMutex_pthread() : owner(0), recursive_count(0)
{
pthread_mutexattr_init(&this->attr);
pthread_mutexattr_settype(&this->attr, PTHREAD_MUTEX_ERRORCHECK);
pthread_mutex_init(&this->mutex, &this->attr);
pthread_cond_init(&this->condition, NULL);
}
/* virtual */ ~ThreadMutex_pthread()
{
int err = pthread_cond_destroy(&this->condition);
assert(err != EBUSY);
err = pthread_mutex_destroy(&this->mutex);
assert(err != EBUSY);
}
bool IsOwnedByCurrentThread() const
{
return this->owner == pthread_self();
}
/* virtual */ void BeginCritical(bool allow_recursive = false)
{
/* pthread mutex is not recursive by itself */
if (this->IsOwnedByCurrentThread()) {
if (!allow_recursive) NOT_REACHED();
} else {
int err = pthread_mutex_lock(&this->mutex);
assert(err == 0);
assert(this->recursive_count == 0);
this->owner = pthread_self();
}
this->recursive_count++;
}
/* virtual */ void EndCritical(bool allow_recursive = false)
{
assert(this->IsOwnedByCurrentThread());
if (!allow_recursive && this->recursive_count != 1) NOT_REACHED();
this->recursive_count--;
if (this->recursive_count != 0) return;
this->owner = 0;
int err = pthread_mutex_unlock(&this->mutex);
assert(err == 0);
}
/* virtual */ void WaitForSignal()
{
uint old_recursive_count = this->recursive_count;
this->recursive_count = 0;
this->owner = 0;
int err = pthread_cond_wait(&this->condition, &this->mutex);
assert(err == 0);
this->owner = pthread_self();
this->recursive_count = old_recursive_count;
}
/* virtual */ void SendSignal()
{
int err = pthread_cond_signal(&this->condition);
assert(err == 0);
}
};
/* static */ ThreadMutex *ThreadMutex::New()
{
return new ThreadMutex_pthread();
}
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