(svn r17339) -Codechange: move thread related files to their own directory (like done for video, music, sound, etc)

src/thread/thread_morphos.cpp

@@ -0,0 +1,199 @@
+/* $Id$ */
+
+/*
+ * 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_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()
+	{
+		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;
+}