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