rubidium@10438: /* $Id$ */
rubidium@10438: 
rubidium@10438: /** @file thread_morphos.cpp MorphOS implementation of Threads. */
rubidium@10438: 
rubidium@10438: #include "stdafx.h"
rubidium@10438: #include "thread.h"
rubidium@10438: #include "debug.h"
rubidium@10438: #include "core/alloc_func.hpp"
rubidium@10438: #include <stdlib.h>
rubidium@10438: #include <unistd.h>
rubidium@10438: 
rubidium@10438: #include <exec/types.h>
rubidium@10438: #include <exec/rawfmt.h>
rubidium@10438: #include <dos/dostags.h>
rubidium@10438: 
rubidium@10438: #include <proto/dos.h>
rubidium@10438: #include <proto/exec.h>
rubidium@10438: 
rubidium@10438: /**
rubidium@10438:  *  avoid name clashes with MorphOS API functions
rubidium@10438:  */
rubidium@10438: #undef Exit
rubidium@10438: #undef Wait
rubidium@10438: 
rubidium@10438: 
rubidium@10438: /**
rubidium@10438:  *  NOTE: this code heavily depends on latest libnix updates. So make
rubidium@10438:  *        sure you link with new stuff which supports semaphore locking of
rubidium@10438:  *        the IO resources, else it will just go foobar.
rubidium@10438:  */
rubidium@10438: 
rubidium@10438: 
rubidium@10438: struct OTTDThreadStartupMessage {
rubidium@10438: 	struct Message msg;  ///< standard exec.library message (MUST be the first thing in the message struct!)
rubidium@10438: 	OTTDThreadFunc func; ///< function the thread will execute
rubidium@10438: 	void *arg;           ///< functions arguments for the thread function
rubidium@10438: };
rubidium@10438: 
rubidium@10438: 
rubidium@10438: /**
rubidium@10438:  *  Default OpenTTD STDIO/ERR debug output is not very useful for this, so we
rubidium@10438:  *  utilize serial/ramdebug instead.
rubidium@10438:  */
rubidium@10438: #ifndef NO_DEBUG_MESSAGES
rubidium@10438: void KPutStr(CONST_STRPTR format)
rubidium@10438: {
rubidium@10438: 	RawDoFmt(format, NULL, (void (*)())RAWFMTFUNC_SERIAL, NULL);
rubidium@10438: }
rubidium@10438: #else
rubidium@10438: #define KPutStr(x)
rubidium@10438: #endif
rubidium@10438: 
rubidium@10438: 
rubidium@10438: /**
rubidium@10438:  * MorphOS version for ThreadObject.
rubidium@10438:  */
rubidium@10438: class ThreadObject_MorphOS : public ThreadObject {
rubidium@10438: private:
rubidium@10438: 	APTR m_thr;                  ///< System thread identifier.
rubidium@10438: 	struct MsgPort *m_replyport;
rubidium@10438: 	struct OTTDThreadStartupMessage m_msg;
rubidium@10438: 
rubidium@10438: public:
rubidium@10438: 	/**
rubidium@10438: 	 * Create a sub process and start it, calling proc(param).
rubidium@10438: 	 */
rubidium@10866: 	ThreadObject_MorphOS(OTTDThreadFunc proc, void *param) : m_thr(0)
rubidium@10438: 	{
rubidium@10438: 		struct Task *parent;
rubidium@10438: 
rubidium@10438: 		KPutStr("[OpenTTD] Create thread...\n");
rubidium@10438: 
rubidium@10438: 		parent = FindTask(NULL);
rubidium@10438: 
rubidium@10438: 		/* Make sure main thread runs with sane priority */
rubidium@10438: 		SetTaskPri(parent, 0);
rubidium@10438: 
rubidium@10438: 		/* Things we'll pass down to the child by utilizing NP_StartupMsg */
rubidium@10438: 		m_msg.func = proc;
rubidium@10438: 		m_msg.arg  = param;
rubidium@10438: 
rubidium@10438: 		m_replyport = CreateMsgPort();
rubidium@10438: 
rubidium@10438: 		if (m_replyport != NULL) {
rubidium@10438: 			struct Process *child;
rubidium@10438: 
rubidium@10438: 			m_msg.msg.mn_Node.ln_Type = NT_MESSAGE;
rubidium@10438: 			m_msg.msg.mn_ReplyPort    = m_replyport;
rubidium@10438: 			m_msg.msg.mn_Length       = sizeof(struct OTTDThreadStartupMessage);
rubidium@10438: 
rubidium@10438: 			child = CreateNewProcTags(
rubidium@10438: 				NP_CodeType,     CODETYPE_PPC,
rubidium@10438: 				NP_Entry,        ThreadObject_MorphOS::Proxy,
rubidium@10438: 				NP_StartupMsg,   (IPTR)&m_msg,
rubidium@10438: 				NP_Priority,     5UL,
rubidium@10438: 				NP_Name,         (IPTR)"OpenTTD Thread",
rubidium@10438: 				NP_PPCStackSize, 131072UL,
rubidium@10438: 				TAG_DONE);
rubidium@10438: 
rubidium@10438: 			m_thr = (APTR) child;
rubidium@10438: 
rubidium@10438: 			if (child != NULL) {
rubidium@10438: 				KPutStr("[OpenTTD] Child process launched.\n");
rubidium@10438: 			} else {
rubidium@10438: 				KPutStr("[OpenTTD] Couldn't create child process. (constructors never fail, yeah!)\n");
rubidium@10438: 				DeleteMsgPort(m_replyport);
rubidium@10438: 			}
rubidium@10438: 		}
rubidium@10438: 	}
rubidium@10438: 
rubidium@10438: 	/**
rubidium@10438: 	 * Create a thread and attach current thread to it.
rubidium@10438: 	 */
rubidium@10866: 	ThreadObject_MorphOS() : m_thr(0)
rubidium@10438: 	{
rubidium@10438: 		m_thr = FindTask(NULL);
rubidium@10438: 	}
rubidium@10438: 
rubidium@10438: 	/* virtual */ ~ThreadObject_MorphOS()
rubidium@10438: 	{
rubidium@10438: 	}
rubidium@10438: 
rubidium@10438: 	/* virtual */ bool IsRunning()
rubidium@10438: 	{
rubidium@10438: 		return m_thr != 0;
rubidium@10438: 	}
rubidium@10438: 
rubidium@10438: 	/* virtual */ bool WaitForStop()
rubidium@10438: 	{
rubidium@10438: 		/* You can't wait on yourself */
rubidium@10438: 		assert(!IsCurrent());
rubidium@10438: 		/* If the thread is not running, waiting is over */
rubidium@10438: 		if (!IsRunning()) return true;
rubidium@10438: 
rubidium@10438: 		WaitPort(m_replyport);
rubidium@10438: 
rubidium@10438: 		GetMsg(m_replyport);
rubidium@10438: 		DeleteMsgPort(m_replyport);
rubidium@10438: 
rubidium@10438: 		return true;
rubidium@10438: 	}
rubidium@10438: 
rubidium@10438: 	/* virtual */ bool Exit()
rubidium@10438: 	{
rubidium@10438: 		struct OTTDThreadStartupMessage *msg;
rubidium@10438: 
rubidium@10438: 		/* You can only exit yourself */
rubidium@10438: 		assert(IsCurrent());
rubidium@10438: 		/* If the thread is not running, we are already closed */
rubidium@10438: 		if (!IsRunning()) return false;
rubidium@10438: 
rubidium@10438: 		KPutStr("[Child] Aborting...\n");
rubidium@10438: 
rubidium@10438: 		if (NewGetTaskAttrs(NULL, &msg, sizeof(struct OTTDThreadStartupMessage *), TASKINFOTYPE_STARTUPMSG, TAG_DONE) && msg != NULL) {
rubidium@10438: 			/* For now we terminate by throwing an error, gives much cleaner cleanup */
rubidium@10438: 			throw 0;
rubidium@10438: 		}
rubidium@10438: 
rubidium@10438: 		return true;
rubidium@10438: 	}
rubidium@10438: 
rubidium@10860: 	/* virtual */ void Join()
rubidium@10438: 	{
rubidium@10438: 		struct OTTDThreadStartupMessage *reply;
rubidium@10438: 
rubidium@10438: 		/* You cannot join yourself */
rubidium@10438: 		assert(!IsCurrent());
rubidium@10438: 
rubidium@10438: 		KPutStr("[OpenTTD] Join threads...\n");
rubidium@10438: 		KPutStr("[OpenTTD] Wait for child to quit...\n");
rubidium@10438: 		WaitPort(m_replyport);
rubidium@10438: 
rubidium@10860: 		GetMsg(m_replyport);
rubidium@10438: 		DeleteMsgPort(m_replyport);
rubidium@10438: 		m_thr = 0;
rubidium@10438: 	}
rubidium@10438: 
rubidium@10438: 	/* virtual */ bool IsCurrent()
rubidium@10438: 	{
rubidium@10438: 		return FindTask(NULL) == m_thr;
rubidium@10438: 	}
rubidium@10438: 
rubidium@10438: 	/* virtual */ uint GetId()
rubidium@10438: 	{
rubidium@10438: 		return (uint)m_thr;
rubidium@10438: 	}
rubidium@10438: 
rubidium@10438: private:
rubidium@10438: 	/**
rubidium@10438: 	 * On thread creation, this function is called, which calls the real startup
rubidium@10438: 	 *  function. This to get back into the correct instance again.
rubidium@10438: 	 */
rubidium@10438: 	static void Proxy(void)
rubidium@10438: 	{
rubidium@10438: 		struct Task *child = FindTask(NULL);
rubidium@10438: 		struct OTTDThreadStartupMessage *msg;
rubidium@10438: 
rubidium@10438: 		/* Make sure, we don't block the parent. */
rubidium@10438: 		SetTaskPri(child, -5);
rubidium@10438: 
rubidium@10438: 		KPutStr("[Child] Progressing...\n");
rubidium@10438: 
rubidium@10438: 		if (NewGetTaskAttrs(NULL, &msg, sizeof(struct OTTDThreadStartupMessage *), TASKINFOTYPE_STARTUPMSG, TAG_DONE) && msg != NULL) {
rubidium@10438: 			try {
rubidium@10860: 				msg->func(msg->arg);
rubidium@10438: 			} catch(...) {
rubidium@10438: 				KPutStr("[Child] Returned to main()\n");
rubidium@10438: 			}
rubidium@10438: 		}
rubidium@10438: 
rubidium@10438: 		/*  Quit the child, exec.library will reply the startup msg internally. */
rubidium@10438: 		KPutStr("[Child] Done.\n");
rubidium@10438: 	}
rubidium@10438: };
rubidium@10438: 
rubidium@10866: /* static */ ThreadObject *ThreadObject::New(OTTDThreadFunc proc, void *param)
rubidium@10438: {
rubidium@10866: 	return new ThreadObject_MorphOS(proc, param);
rubidium@10438: }
rubidium@10438: 
rubidium@10438: /* static */ ThreadObject *ThreadObject::AttachCurrent()
rubidium@10438: {
rubidium@10438: 	return new ThreadObject_MorphOS();
rubidium@10438: }
rubidium@10438: 
rubidium@10438: /* static */ uint ThreadObject::CurrentId()
rubidium@10438: {
rubidium@10438: 	return (uint) FindTask(NULL);
rubidium@10438: }
rubidium@10438: 
rubidium@10438: 
rubidium@10438: /**
rubidium@10438:  * MorphOS version of ThreadSemaphore.
rubidium@10438:  */
rubidium@10438: class ThreadSemaphore_MorphOS : public ThreadSemaphore {
rubidium@10438: private:
rubidium@10438: 	struct SignalSemaphore m_sem;
rubidium@10438: 
rubidium@10438: public:
rubidium@10438: 	ThreadSemaphore_MorphOS()
rubidium@10438: 	{
rubidium@10438: 		InitSemaphore(&m_sem);
rubidium@10438: 	}
rubidium@10438: 
rubidium@10438: 	/* virtual */ ~ThreadSemaphore_MorphOS()
rubidium@10438: 	{
rubidium@10438: 
rubidium@10438: 	}
rubidium@10438: 
rubidium@10438: 	/* virtual */ void Set()
rubidium@10438: 	{
rubidium@10860: 		/* Check if semaphore count is really important there. */
rubidium@10438: 		ReleaseSemaphore(&m_sem);
rubidium@10438: 	}
rubidium@10438: 
rubidium@10438: 	/* virtual */ void Wait()
rubidium@10438: 	{
rubidium@10438: 		ObtainSemaphore(&m_sem);
rubidium@10438: 	}
rubidium@10438: };
rubidium@10438: 
rubidium@10438: /* static */ ThreadSemaphore *ThreadSemaphore::New()
rubidium@10438: {
rubidium@10438: 	return new ThreadSemaphore_MorphOS();
rubidium@10438: }