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diff --git a/util/thread.cpp b/util/thread.cpp
index f4bfd1d8..82efb4f6 100644
--- a/util/thread.cpp
+++ b/util/thread.cpp
@@ -1,173 +1,181 @@
#include "thread.h"
namespace Util{
namespace Thread{
+bool isUninitialized(Id thread){
+ return thread == uninitializedValue;
+}
+
#ifdef USE_SDL
+Id uninitializedValue = NULL;
+
void initializeLock(Lock * lock){
*lock = SDL_CreateMutex();
}
int acquireLock(Lock * lock){
return SDL_LockMutex(*lock);
}
int releaseLock(Lock * lock){
return SDL_UnlockMutex(*lock);
}
void destroyLock(Lock * lock){
SDL_DestroyMutex(*lock);
}
void initializeSemaphore(Semaphore * semaphore, unsigned int value){
*semaphore = SDL_CreateSemaphore(value);
}
void destroySemaphore(Semaphore * semaphore){
SDL_DestroySemaphore(*semaphore);
}
void semaphoreDecrease(Semaphore * semaphore){
SDL_SemWait(*semaphore);
}
void semaphoreIncrease(Semaphore * semaphore){
SDL_SemPost(*semaphore);
}
bool createThread(Id * thread, void * attributes, ThreadFunction function, void * arg){
*thread = SDL_CreateThread(function, arg);
return *thread != NULL;
}
void joinThread(Id thread){
SDL_WaitThread(thread, NULL);
}
void cancelThread(Id thread){
SDL_KillThread(thread);
}
#else
+Id uninitializedValue = 0;
+
void initializeLock(Lock * lock){
pthread_mutex_init(lock, NULL);
}
int acquireLock(Lock * lock){
return pthread_mutex_lock(lock);
}
int releaseLock(Lock * lock){
return pthread_mutex_unlock(lock);
}
void initializeSemaphore(Semaphore * semaphore, unsigned int value){
sem_init(semaphore, 0, value);
}
void destroySemaphore(Semaphore * semaphore){
/* nothing */
}
void semaphoreDecrease(Semaphore * semaphore){
sem_wait(semaphore);
}
void semaphoreIncrease(Semaphore * semaphore){
sem_post(semaphore);
}
bool createThread(Id * thread, void * attributes, ThreadFunction function, void * arg){
return pthread_create(thread, (pthread_attr_t*) attributes, function, arg) == 0;
}
void joinThread(Id thread){
pthread_join(thread, NULL);
}
void cancelThread(Id thread){
/* FIXME: cancel is not implemented for libogc, find another way.
* thread suspend/resume is there, though.
*/
#if !defined(WII)
pthread_cancel(thread);
#endif
}
void destroyLock(Lock * lock){
/* nothing */
}
#endif
}
WaitThread::WaitThread():
done(false){
Thread::initializeLock(&doneLock);
}
WaitThread::WaitThread(Thread::ThreadFunction thread, void * arg){
Thread::initializeLock(&doneLock);
start(thread, arg);
}
static void * do_thread(void * arg){
WaitThread * thread = (WaitThread *) arg;
thread->doRun();
return NULL;
}
void WaitThread::doRun(){
this->function(this->arg);
Thread::acquireLock(&doneLock);
this->done = true;
Thread::releaseLock(&doneLock);
}
void WaitThread::start(Thread::ThreadFunction thread, void * arg){
done = false;
this->arg = arg;
this->function = thread;
Thread::createThread(&this->thread, NULL, (Thread::ThreadFunction) do_thread, this);
}
bool WaitThread::isRunning(){
Thread::acquireLock(&doneLock);
bool what = done;
Thread::releaseLock(&doneLock);
return what;
}
void WaitThread::kill(){
Thread::cancelThread(thread);
Thread::joinThread(thread);
}
WaitThread::~WaitThread(){
/* FIXME: Should we join the thread? */
/* pthread_join(thread); */
}
ThreadBoolean::ThreadBoolean(volatile bool & what, Thread::Lock & lock):
what(what),
lock(lock){
}
bool ThreadBoolean::get(){
Thread::acquireLock(&lock);
bool b = what;
Thread::releaseLock(&lock);
return b;
}
void ThreadBoolean::set(bool value){
Thread::acquireLock(&lock);
what = value;
Thread::releaseLock(&lock);
}
}
diff --git a/util/thread.h b/util/thread.h
index 205710ec..0f8e834a 100644
--- a/util/thread.h
+++ b/util/thread.h
@@ -1,193 +1,196 @@
#ifndef _paintown_thread_h
#define _paintown_thread_h
#ifdef USE_SDL
#include <SDL_thread.h>
#include <SDL_mutex.h>
#else
#include <pthread.h>
#include <semaphore.h>
#endif
#include "exceptions/exception.h"
#include "util/load_exception.h"
#include "util/token_exception.h"
#include "mugen/exception.h"
#include "debug.h"
namespace Util{
/* Either uses pthreads or SDL_thread */
namespace Thread{
#ifdef USE_SDL
typedef SDL_mutex* Lock;
typedef SDL_Thread* Id;
typedef int (*ThreadFunction)(void*);
typedef SDL_semaphore* Semaphore;
#else
typedef pthread_mutex_t Lock;
typedef pthread_t Id;
typedef sem_t Semaphore;
typedef void * (*ThreadFunction)(void*);
#endif
+ extern Id uninitializedValue;
+ bool isUninitialized(Id thread);
void initializeLock(Lock * lock);
void initializeSemaphore(Semaphore * semaphore, unsigned int value);
void destroySemaphore(Semaphore * semaphore);
void semaphoreDecrease(Semaphore * semaphore);
void semaphoreIncrease(Semaphore * semaphore);
int acquireLock(Lock * lock);
int releaseLock(Lock * lock);
void destroyLock(Lock * lock);
bool createThread(Id * thread, void * attributes, ThreadFunction function, void * arg);
void joinThread(Id thread);
void cancelThread(Id thread);
}
class WaitThread{
public:
/* does not start a new thread yet */
WaitThread();
/* starts a thread */
WaitThread(Thread::ThreadFunction thread, void * arg);
/* starts a thread */
void start(Thread::ThreadFunction thread, void * arg);
bool isRunning();
void kill();
virtual ~WaitThread();
public:
/* actually runs the thread */
void doRun();
protected:
Thread::Lock doneLock;
Thread::Id thread;
volatile bool done;
void * arg;
Thread::ThreadFunction function;
};
/* wraps a boolean with lock/unlock while checking/setting it */
class ThreadBoolean{
public:
ThreadBoolean(volatile bool & what, Thread::Lock & lock);
bool get();
void set(bool value);
protected:
volatile bool & what;
Thread::Lock & lock;
};
/* Computes stuff in a separate thread and gives it back when you ask for it.
* As soon as the future is created a thread will start executing and compute
* whatever it is that the class is supposed to do. You can then call `get'
* on the future object to get the result. If the thread is still executing
* then `get' will block until the future completes. If the future has already
* completed then `get' will return immediately with the computed value.
* The use case is computing something that has to be used later:
* Future future; // might take a while to compute
* do_stuff_that_takes_a_while(); // future might finish sometime in here
* Object o = future.get(); // future is already done
*
* TODO: handle exceptions
*/
template<class X>
class Future{
protected:
/* WARNING: hack to find out the type of the exception */
enum ExceptionType{
None,
Load,
Token,
Base,
Mugen
};
public:
Future():
thing(0),
+ thread(Thread::uninitializedValue),
exception(__FILE__, __LINE__),
haveException(None){
/* future will increase the count */
Thread::initializeSemaphore(&future, 0);
}
virtual ~Future(){
- if (thread != NULL){
+ if (Thread::isUninitialized(thread)){
Thread::joinThread(thread);
}
Thread::destroySemaphore(&future);
}
virtual X get(){
X out;
Thread::semaphoreDecrease(&future);
switch (haveException){
case None : break;
case Load : throw LoadException(__FILE__, __LINE__, exception, "Failed in future");
case Mugen : throw MugenException(exception.getTrace());
case Token: throw TokenException(exception);
default : throw Exception::Base(__FILE__, __LINE__, exception);
}
out = thing;
Thread::semaphoreIncrease(&future);
return out;
}
virtual void start(){
if (!Thread::createThread(&thread, NULL, (Thread::ThreadFunction) runit, this)){
Global::debug(0) << "Could not create future thread. Blocking until its done" << std::endl;
runit(this);
// throw Exception::Base(__FILE__, __LINE__);
}
}
protected:
static void * runit(void * arg){
Future<X> * me = (Future<X>*) arg;
try{
me->compute();
} catch (const LoadException & load){
me->haveException = Load;
me->exception.set(load);
} catch (const TokenException & t){
me->haveException = Token;
me->exception.set(t);
} catch (const MugenException & m){
me->haveException = Mugen;
me->exception.set(m);
} catch (const Exception::Base & base){
me->haveException = Base;
me->exception.set(base);
}
Thread::semaphoreIncrease(&me->future);
return NULL;
}
virtual void set(X x){
this->thing = x;
}
virtual void compute() = 0;
X thing;
Thread::Id thread;
Thread::Semaphore future;
/* if any exceptions occur, throw them from `get' */
Exception::Base exception;
ExceptionType haveException;
};
}
#endif

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