# HG changeset patch
# User rubidium <rubidium@openttd.org>
# Date 2009-01-20 03:12:46
# Node ID 019e0339155adffef98e1349f63551c34f90ed89
# Parent  adfba97cb1d15ed8476b85c4409b7c02ef74988d

(svn r15158) -Cleanup: remove some unused/unneeded cruft from the thread generalisation.

diff --git a/src/genworld.cpp b/src/genworld.cpp
--- a/src/genworld.cpp
+++ b/src/genworld.cpp
@@ -300,7 +300,7 @@ void GenerateWorld(GenerateWorldMode mod
 	}
 
 	if (BlitterFactoryBase::GetCurrentBlitter()->GetScreenDepth() == 0 ||
-	    (_gw.thread = ThreadObject::New(&_GenerateWorld, NULL)) == NULL) {
+	    !ThreadObject::New(&_GenerateWorld, NULL, &_gw.thread)) {
 		DEBUG(misc, 1, "Cannot create genworld thread, reverting to single-threaded mode");
 		_gw.threaded = false;
 		_GenerateWorld(NULL);
diff --git a/src/saveload/saveload.cpp b/src/saveload/saveload.cpp
--- a/src/saveload/saveload.cpp
+++ b/src/saveload/saveload.cpp
@@ -1720,7 +1720,7 @@ SaveOrLoadResult SaveOrLoad(const char *
 
 			SaveFileStart();
 			if (_network_server ||
-						(_save_thread = ThreadObject::New(&SaveFileToDiskThread, NULL)) == NULL) {
+						!ThreadObject::New(&SaveFileToDiskThread, NULL, &_save_thread)) {
 				if (!_network_server) DEBUG(sl, 1, "Cannot create savegame thread, reverting to single-threaded mode...");
 
 				SaveOrLoadResult result = SaveFileToDisk(false);
diff --git a/src/thread.h b/src/thread.h
--- a/src/thread.h
+++ b/src/thread.h
@@ -20,18 +20,6 @@ public:
 	virtual ~ThreadObject() {};
 
 	/**
-	 * Check if the thread is currently running.
-	 * @return True if the thread is running.
-	 */
-	virtual bool IsRunning() = 0;
-
-	/**
-	 * Waits for the thread to exit.
-	 * @return True if the thread has exited.
-	 */
-	virtual bool WaitForStop() = 0;
-
-	/**
 	 * Exit this thread.
 	 */
 	virtual bool Exit() = 0;
@@ -42,60 +30,14 @@ public:
 	virtual void Join() = 0;
 
 	/**
-	 * Check if this thread is the current active thread.
-	 * @return True if it is the current active thread.
-	 */
-	virtual bool IsCurrent() = 0;
-
-	/**
-	 * Get the unique ID of this thread.
-	 * @return A value unique to each thread.
-	 */
-	virtual uint GetId() = 0;
-
-	/**
 	 * Create a thread; proc will be called as first function inside the thread,
 	 *  with optinal params.
 	 * @param proc The procedure to call inside the thread.
 	 * @param param The params to give with 'proc'.
+	 * @param thread Place to store a pointer to the thread in. May be NULL.
 	 * @return True if the thread was started correctly.
 	 */
-	static ThreadObject *New(OTTDThreadFunc proc, void *param);
-
-	/**
-	 * Convert the current thread to a new ThreadObject.
-	 * @return A new ThreadObject with the current thread attached to it.
-	 */
-	static ThreadObject *AttachCurrent();
-
-	/**
-	 * Find the Id of the current running thread.
-	 * @return The thread ID of the current active thread.
-	 */
-	static uint CurrentId();
-};
-
-/**
- * Cross-platform Thread Semaphore. Wait() waits for a Set() of someone else.
- */
-class ThreadSemaphore {
-public:
-	static ThreadSemaphore *New();
-
-	/**
-	 * Virtual Destructor to avoid compiler warnings.
-	 */
-	virtual ~ThreadSemaphore() {};
-
-	/**
-	 * Signal all threads that are in Wait() to continue.
-	 */
-	virtual void Set() = 0;
-
-	/**
-	 * Wait until we are signaled by a call to Set().
-	 */
-	virtual void Wait() = 0;
+	static bool New(OTTDThreadFunc proc, void *param, ThreadObject **thread = NULL);
 };
 
 #endif /* THREAD_H */
diff --git a/src/thread_morphos.cpp b/src/thread_morphos.cpp
--- a/src/thread_morphos.cpp
+++ b/src/thread_morphos.cpp
@@ -59,12 +59,14 @@ private:
 	APTR m_thr;                  ///< System thread identifier.
 	struct MsgPort *m_replyport;
 	struct OTTDThreadStartupMessage m_msg;
+	bool self_destruct;
 
 public:
 	/**
 	 * Create a sub process and start it, calling proc(param).
 	 */
-	ThreadObject_MorphOS(OTTDThreadFunc proc, void *param) : m_thr(0)
+	ThreadObject_MorphOS(OTTDThreadFunc proc, void *param, self_destruct) :
+		m_thr(0), self_destruct(self_destruct)
 	{
 		struct Task *parent;
 
@@ -108,46 +110,16 @@ public:
 		}
 	}
 
-	/**
-	 * Create a thread and attach current thread to it.
-	 */
-	ThreadObject_MorphOS() : m_thr(0)
-	{
-		m_thr = FindTask(NULL);
-	}
-
 	/* virtual */ ~ThreadObject_MorphOS()
 	{
 	}
 
-	/* virtual */ bool IsRunning()
-	{
-		return m_thr != 0;
-	}
-
-	/* virtual */ bool WaitForStop()
-	{
-		/* You can't wait on yourself */
-		assert(!IsCurrent());
-		/* If the thread is not running, waiting is over */
-		if (!IsRunning()) return true;
-
-		WaitPort(m_replyport);
-
-		GetMsg(m_replyport);
-		DeleteMsgPort(m_replyport);
-
-		return true;
-	}
-
 	/* virtual */ bool Exit()
 	{
 		struct OTTDThreadStartupMessage *msg;
 
 		/* You can only exit yourself */
 		assert(IsCurrent());
-		/* If the thread is not running, we are already closed */
-		if (!IsRunning()) return false;
 
 		KPutStr("[Child] Aborting...\n");
 
@@ -180,11 +152,6 @@ public:
 		return FindTask(NULL) == m_thr;
 	}
 
-	/* virtual */ uint GetId()
-	{
-		return (uint)m_thr;
-	}
-
 private:
 	/**
 	 * On thread creation, this function is called, which calls the real startup
@@ -212,56 +179,14 @@ private:
 
 		/*  Quit the child, exec.library will reply the startup msg internally. */
 		KPutStr("[Child] Done.\n");
+
+		if (self_destruct) delete this;
 	}
 };
 
-/* static */ ThreadObject *ThreadObject::New(OTTDThreadFunc proc, void *param)
-{
-	return new ThreadObject_MorphOS(proc, param);
-}
-
-/* static */ ThreadObject *ThreadObject::AttachCurrent()
+/* static */ bool ThreadObject::New(OTTDThreadFunc proc, void *param, ThreadObject **thread)
 {
-	return new ThreadObject_MorphOS();
-}
-
-/* static */ uint ThreadObject::CurrentId()
-{
-	return (uint) FindTask(NULL);
+	ThreadObject *to = new ThreadObject_MorphOS(proc, param, thread == NULL);
+	if (thread != NULL) *thread = to;
+	return true;
 }
-
-
-/**
- * MorphOS version of ThreadSemaphore.
- */
-class ThreadSemaphore_MorphOS : public ThreadSemaphore {
-private:
-	struct SignalSemaphore m_sem;
-
-public:
-	ThreadSemaphore_MorphOS()
-	{
-		InitSemaphore(&m_sem);
-	}
-
-	/* virtual */ ~ThreadSemaphore_MorphOS()
-	{
-
-	}
-
-	/* virtual */ void Set()
-	{
-		/* Check if semaphore count is really important there. */
-		ReleaseSemaphore(&m_sem);
-	}
-
-	/* virtual */ void Wait()
-	{
-		ObtainSemaphore(&m_sem);
-	}
-};
-
-/* static */ ThreadSemaphore *ThreadSemaphore::New()
-{
-	return new ThreadSemaphore_MorphOS();
-}
diff --git a/src/thread_none.cpp b/src/thread_none.cpp
--- a/src/thread_none.cpp
+++ b/src/thread_none.cpp
@@ -5,22 +5,8 @@
 #include "stdafx.h"
 #include "thread.h"
 
-/* static */ ThreadObject *ThreadObject::New(OTTDThreadFunc proc, void *param)
+/* static */ bool ThreadObject::New(OTTDThreadFunc proc, void *param, ThreadObject **thread)
 {
-	return NULL;
-}
-
-/* static */ ThreadObject *ThreadObject::AttachCurrent()
-{
-	return NULL;
+	if (thread != NULL) *thread = NULL;
+	return false;
 }
-
-/* static */ uint ThreadObject::CurrentId()
-{
-	return -1;
-}
-
-/* static */ ThreadSemaphore *ThreadSemaphore::New()
-{
-	return NULL;
-}
diff --git a/src/thread_os2.cpp b/src/thread_os2.cpp
--- a/src/thread_os2.cpp
+++ b/src/thread_os2.cpp
@@ -59,22 +59,8 @@ void OTTDExitThread()
 
 #endif
 
-/* static */ ThreadObject *ThreadObject::New(OTTDThreadFunc proc, void *param)
+/* static */ ThreadObject *ThreadObject::New(OTTDThreadFunc proc, void *param, ThreadObject **thread)
 {
-	return NULL;
-}
-
-/* static */ ThreadObject *ThreadObject::AttachCurrent()
-{
-	return NULL;
+	if (thread != NULL) *thread = NULL;
+	return false;
 }
-
-/* static */ uint ThreadObject::CurrentId()
-{
-	return -1;
-}
-
-/* static */ ThreadSemaphore *ThreadSemaphore::New()
-{
-	return NULL;
-}
diff --git a/src/thread_pthread.cpp b/src/thread_pthread.cpp
--- a/src/thread_pthread.cpp
+++ b/src/thread_pthread.cpp
@@ -16,81 +16,27 @@
  */
 class ThreadObject_pthread : public ThreadObject {
 private:
-	pthread_t m_thr;             ///< System thread identifier.
-	OTTDThreadFunc m_proc;       ///< External thread procedure.
-	void     *m_param;           ///< Parameter for the external thread procedure.
-	bool      m_attached;        ///< True if the ThreadObject was attached to an existing thread.
-	sem_t     m_sem_start;       ///< Here the new thread waits before it starts.
-	sem_t     m_sem_stop;        ///< Here the other thread can wait for this thread to end.
+	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?
 
 public:
 	/**
 	 * Create a pthread and start it, calling proc(param).
 	 */
-	ThreadObject_pthread(OTTDThreadFunc proc, void *param) :
-		m_thr(0),
-		m_proc(proc),
-		m_param(param),
-		m_attached(false)
-	{
-		sem_init(&m_sem_start, 0, 0);
-		sem_init(&m_sem_stop, 0, 0);
-
-		pthread_create(&m_thr, NULL, &stThreadProc, this);
-		sem_post(&m_sem_start);
-	}
-
-	/**
-	 * Create a pthread and attach current thread to it.
-	 */
-	ThreadObject_pthread() :
-		m_thr(0),
-		m_proc(NULL),
-		m_param(0),
-		m_attached(true)
+	ThreadObject_pthread(OTTDThreadFunc proc, void *param, bool self_destruct) :
+		thread(0),
+		proc(proc),
+		param(param),
+		self_destruct(self_destruct)
 	{
-		sem_init(&m_sem_start, 0, 0);
-		sem_init(&m_sem_stop, 0, 0);
-
-		m_thr = pthread_self();
-	}
-
-	/* virtual */ ~ThreadObject_pthread()
-	{
-		sem_destroy(&m_sem_stop);
-		sem_destroy(&m_sem_start);
-	};
-
-	/* virtual */ bool IsRunning()
-	{
-		int sval;
-		sem_getvalue(&m_sem_stop, &sval);
-		return sval == 0;
-	}
-
-	/* virtual */ bool WaitForStop()
-	{
-		/* You can't wait on yourself */
-		assert(!IsCurrent());
-		/* If the thread is not running, waiting is over */
-		if (!IsRunning()) return true;
-
-		int ret = sem_wait(&m_sem_stop);
-		if (ret == 0) {
-			/* We have passed semaphore so increment it again */
-			sem_post(&m_sem_stop);
-			return true;
-		}
-		return false;
+		pthread_create(&this->thread, NULL, &stThreadProc, this);
 	}
 
 	/* virtual */ bool Exit()
 	{
-		/* You can only exit yourself */
-		assert(IsCurrent());
-		/* If the thread is not running, we are already closed */
-		if (!IsRunning()) return false;
-
+		assert(pthread_self() == this->thread);
 		/* For now we terminate by throwing an error, gives much cleaner cleanup */
 		throw OTTDThreadExitSignal();
 	}
@@ -98,22 +44,10 @@ public:
 	/* virtual */ void Join()
 	{
 		/* You cannot join yourself */
-		assert(!IsCurrent());
-
-		pthread_join(m_thr, NULL);
-		m_thr = 0;
+		assert(pthread_self() != this->thread);
+		pthread_join(this->thread, NULL);
+		this->thread = 0;
 	}
-
-	/* virtual */ bool IsCurrent()
-	{
-		return pthread_self() == m_thr;
-	}
-
-	/* virtual */ uint GetId()
-	{
-		return (uint)m_thr;
-	}
-
 private:
 	/**
 	 * On thread creation, this function is called, which calls the real startup
@@ -131,69 +65,21 @@ private:
 	 */
 	void ThreadProc()
 	{
-		/* The new thread stops here so the calling thread can complete pthread_create() call */
-		sem_wait(&m_sem_start);
-
 		/* Call the proc of the creator to continue this thread */
 		try {
-			m_proc(m_param);
+			this->proc(this->param);
 		} catch (OTTDThreadExitSignal e) {
 		} catch (...) {
 			NOT_REACHED();
 		}
 
-		/* Notify threads waiting for our completion */
-		sem_post(&m_sem_stop);
+		if (self_destruct) delete this;
 	}
 };
 
-/* static */ ThreadObject *ThreadObject::New(OTTDThreadFunc proc, void *param)
-{
-	return new ThreadObject_pthread(proc, param);
-}
-
-/* static */ ThreadObject *ThreadObject::AttachCurrent()
+/* static */ bool ThreadObject::New(OTTDThreadFunc proc, void *param, ThreadObject **thread)
 {
-	return new ThreadObject_pthread();
-}
-
-/* static */ uint ThreadObject::CurrentId()
-{
-	return (uint)pthread_self();
+	ThreadObject *to = new ThreadObject_pthread(proc, param, thread == NULL);
+	if (thread != NULL) *thread = to;
+	return true;
 }
-
-
-/**
- * POSIX pthread version of ThreadSemaphore.
- */
-class ThreadSemaphore_pthread : public ThreadSemaphore {
-private:
-	sem_t m_sem;
-
-public:
-	ThreadSemaphore_pthread()
-	{
-		sem_init(&m_sem, 0, 0);
-	}
-
-	/* virtual */ ~ThreadSemaphore_pthread()
-	{
-		sem_destroy(&m_sem);
-	}
-
-	/* virtual */ void Set()
-	{
-		int val = 0;
-		if (sem_getvalue(&m_sem, &val) == 0 && val == 0) sem_post(&m_sem);
-	}
-
-	/* virtual */ void Wait()
-	{
-		sem_wait(&m_sem);
-	}
-};
-
-/* static */ ThreadSemaphore *ThreadSemaphore::New()
-{
-	return new ThreadSemaphore_pthread();
-}
diff --git a/src/thread_win32.cpp b/src/thread_win32.cpp
--- a/src/thread_win32.cpp
+++ b/src/thread_win32.cpp
@@ -15,77 +15,39 @@
  */
 class ThreadObject_Win32 : public ThreadObject {
 private:
-	uint     m_id_thr;
-	HANDLE   m_h_thr;
-	OTTDThreadFunc m_proc;
-	void     *m_param;
-	bool     m_attached;
+	HANDLE thread;       ///< System thread identifier.
+	uint id;             ///< Thread identifier.
+	OTTDThreadFunc proc; ///< External thread procedure.
+	void *param;         ///< Parameter for the external thread procedure.
+	bool self_destruct;  ///< Free ourselves when done?
 
 public:
 	/**
 	 * Create a win32 thread and start it, calling proc(param).
 	 */
-	ThreadObject_Win32(OTTDThreadFunc proc, void *param) :
-		m_id_thr(0),
-		m_h_thr(NULL),
-		m_proc(proc),
-		m_param(param),
-		m_attached(false)
+	ThreadObject_Win32(OTTDThreadFunc proc, void *param, bool self_destruct) :
+		thread(NULL),
+		id(0),
+		proc(proc),
+		param(param),
+		self_destruct(self_destruct)
 	{
-		m_h_thr = (HANDLE)_beginthreadex(NULL, 0, &stThreadProc, this, CREATE_SUSPENDED, &m_id_thr);
-		if (m_h_thr == NULL) return;
-		ResumeThread(m_h_thr);
-	}
-
-	/**
-	 * Create a win32 thread and attach current thread to it.
-	 */
-	ThreadObject_Win32() :
-		m_id_thr(0),
-		m_h_thr(NULL),
-		m_proc(NULL),
-		m_param(NULL),
-		m_attached(false)
-	{
-		BOOL ret = DuplicateHandle(GetCurrentProcess(), GetCurrentThread(), GetCurrentProcess(), &m_h_thr, 0, FALSE, DUPLICATE_SAME_ACCESS);
-		if (!ret) return;
-		m_id_thr = GetCurrentThreadId();
+		this->thread = (HANDLE)_beginthreadex(NULL, 0, &stThreadProc, this, CREATE_SUSPENDED, &this->id);
+		if (this->thread == NULL) return;
+		ResumeThread(this->thread);
 	}
 
 	/* virtual */ ~ThreadObject_Win32()
 	{
-		if (m_h_thr != NULL) {
-			CloseHandle(m_h_thr);
-			m_h_thr = NULL;
+		if (this->thread != NULL) {
+			CloseHandle(this->thread);
+			this->thread = NULL;
 		}
 	}
 
-	/* virtual */ bool IsRunning()
-	{
-		if (m_h_thr == NULL) return false;
-		DWORD exit_code = 0;
-		if (!GetExitCodeThread(m_h_thr, &exit_code)) return false;
-		return (exit_code == STILL_ACTIVE);
-	}
-
-	/* virtual */ bool WaitForStop()
-	{
-		/* You can't wait on yourself */
-		assert(!IsCurrent());
-		/* If the thread is not running, waiting is over */
-		if (!IsRunning()) return true;
-
-		DWORD res = WaitForSingleObject(m_h_thr, INFINITE);
-		return res == WAIT_OBJECT_0;
-	}
-
 	/* virtual */ bool Exit()
 	{
-		/* You can only exit yourself */
-		assert(IsCurrent());
-		/* If the thread is not running, we are already closed */
-		if (!IsRunning()) return false;
-
+		assert(GetCurrentThreadId() == this->id);
 		/* For now we terminate by throwing an error, gives much cleaner cleanup */
 		throw OTTDThreadExitSignal();
 	}
@@ -93,20 +55,8 @@ public:
 	/* virtual */ void Join()
 	{
 		/* You cannot join yourself */
-		assert(!IsCurrent());
-
-		WaitForSingleObject(m_h_thr, INFINITE);
-	}
-
-	/* virtual */ bool IsCurrent()
-	{
-		DWORD id_cur = GetCurrentThreadId();
-		return id_cur == m_id_thr;
-	}
-
-	/* virtual */ uint GetId()
-	{
-		return m_id_thr;
+		assert(GetCurrentThreadId() != this->id);
+		WaitForSingleObject(this->thread, INFINITE);
 	}
 
 private:
@@ -127,60 +77,19 @@ private:
 	void ThreadProc()
 	{
 		try {
-			m_proc(m_param);
+			this->proc(this->param);
 		} catch (OTTDThreadExitSignal) {
 		} catch (...) {
 			NOT_REACHED();
 		}
+
+		if (self_destruct) delete this;
 	}
 };
 
-/* static */ ThreadObject *ThreadObject::New(OTTDThreadFunc proc, void *param)
-{
-	return new ThreadObject_Win32(proc, param);
-}
-
-/* static */ ThreadObject* ThreadObject::AttachCurrent()
+/* static */ bool ThreadObject::New(OTTDThreadFunc proc, void *param, ThreadObject **thread)
 {
-	return new ThreadObject_Win32();
-}
-
-/* static */ uint ThreadObject::CurrentId()
-{
-	return GetCurrentThreadId();
+	ThreadObject *to = new ThreadObject_Win32(proc, param, thread == NULL);
+	if (thread != NULL) *thread = to;
+	return true;
 }
-
-
-/**
- * Win32 thread version of ThreadSemaphore.
- */
-class ThreadSemaphore_Win32 : public ThreadSemaphore {
-private:
-	HANDLE m_handle;
-
-public:
-	ThreadSemaphore_Win32()
-	{
-		m_handle = ::CreateEvent(NULL, FALSE, FALSE, NULL);
-	}
-
-	/* virtual */ ~ThreadSemaphore_Win32()
-	{
-		::CloseHandle(m_handle);
-	}
-
-	/* virtual */ void Set()
-	{
-		::SetEvent(m_handle);
-	}
-
-	/* virtual */ void Wait()
-	{
-		::WaitForSingleObject(m_handle, INFINITE);
-	}
-};
-
-/* static */ ThreadSemaphore *ThreadSemaphore::New()
-{
-	return new ThreadSemaphore_Win32();
-}