# thread_morphos.cpp

Go to the documentation of this file.

    00001 /* $Id$ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * 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.
    00006  * 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.
    00007  * 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/>.
    00008  */
    00009
    00012 #include "../stdafx.h"
    00013 #include "thread.h"
    00014 #include "../debug.h"
    00015 #include "../core/alloc_func.hpp"
    00016 #include <stdlib.h>
    00017 #include <unistd.h>
    00018
    00019 #include <exec/types.h>
    00020 #include <exec/rawfmt.h>
    00021 #include <dos/dostags.h>
    00022
    00023 #include <proto/dos.h>
    00024 #include <proto/exec.h>
    00025
    00029 #undef Exit
    00030 #undef Wait
    00031
    00032
    00040 struct OTTDThreadStartupMessage {
    00041   struct Message msg;
    00042   OTTDThreadFunc func;
    00043   void *arg;
    00044 };
    00045
    00046
    00051 #ifndef NO_DEBUG_MESSAGES
    00052 void KPutStr(CONST_STRPTR format)
    00053 {
    00054   RawDoFmt(format, NULL, (void (*)())RAWFMTFUNC_SERIAL, NULL);
    00055 }
    00056 #else
    00057 #define KPutStr(x)
    00058 #endif
    00059
    00060
    00064 class ThreadObject_MorphOS : public ThreadObject {
    00065 private:
    00066   APTR m_thr;
    00067   struct MsgPort *m_replyport;
    00068   struct OTTDThreadStartupMessage m_msg;
    00069   bool self_destruct;
    00070
    00071 public:
    00075   ThreadObject_MorphOS(OTTDThreadFunc proc, void *param, self_destruct) :
    00076     m_thr(0), self_destruct(self_destruct)
    00077   {
    00078     struct Task *parent;
    00079
    00080     KPutStr("[OpenTTD] Create thread...\n");
    00081
    00082     parent = FindTask(NULL);
    00083
    00084     /* Make sure main thread runs with sane priority */
    00085     SetTaskPri(parent, 0);
    00086
    00087     /* Things we'll pass down to the child by utilizing NP_StartupMsg */
    00088     m_msg.func = proc;
    00089     m_msg.arg  = param;
    00090
    00091     m_replyport = CreateMsgPort();
    00092
    00093     if (m_replyport != NULL) {
    00094       struct Process *child;
    00095
    00096       m_msg.msg.mn_Node.ln_Type = NT_MESSAGE;
    00097       m_msg.msg.mn_ReplyPort    = m_replyport;
    00098       m_msg.msg.mn_Length       = sizeof(struct OTTDThreadStartupMessage);
    00099
    00100       child = CreateNewProcTags(
    00101         NP_CodeType,     CODETYPE_PPC,
    00102         NP_Entry,        ThreadObject_MorphOS::Proxy,
    00103         NP_StartupMsg,   (IPTR)&m_msg,
    00104         NP_Priority,     5UL,
    00105         NP_Name,         (IPTR)"OpenTTD Thread",
    00106         NP_PPCStackSize, 131072UL,
    00107         TAG_DONE);
    00108
    00109       m_thr = (APTR) child;
    00110
    00111       if (child != NULL) {
    00112         KPutStr("[OpenTTD] Child process launched.\n");
    00113       } else {
    00114         KPutStr("[OpenTTD] Couldn't create child process. (constructors never fail, yeah!)\n");
    00115         DeleteMsgPort(m_replyport);
    00116       }
    00117     }
    00118   }
    00119
    00120   /* virtual */ ~ThreadObject_MorphOS()
    00121   {
    00122   }
    00123
    00124   /* virtual */ bool Exit()
    00125   {
    00126     struct OTTDThreadStartupMessage *msg;
    00127
    00128     /* You can only exit yourself */
    00129     assert(IsCurrent());
    00130
    00131     KPutStr("[Child] Aborting...\n");
    00132
    00133     if (NewGetTaskAttrs(NULL, &msg, sizeof(struct OTTDThreadStartupMessage *), TASKINFOTYPE_STARTUPMSG, TAG_DONE) && msg != NULL) {
    00134       /* For now we terminate by throwing an error, gives much cleaner cleanup */
    00135       throw OTTDThreadExitSignal();
    00136     }
    00137
    00138     return true;
    00139   }
    00140
    00141   /* virtual */ void Join()
    00142   {
    00143     struct OTTDThreadStartupMessage *reply;
    00144
    00145     /* You cannot join yourself */
    00146     assert(!IsCurrent());
    00147
    00148     KPutStr("[OpenTTD] Join threads...\n");
    00149     KPutStr("[OpenTTD] Wait for child to quit...\n");
    00150     WaitPort(m_replyport);
    00151
    00152     GetMsg(m_replyport);
    00153     DeleteMsgPort(m_replyport);
    00154     m_thr = 0;
    00155   }
    00156
    00157   /* virtual */ bool IsCurrent()
    00158   {
    00159     return FindTask(NULL) == m_thr;
    00160   }
    00161
    00162 private:
    00167   static void Proxy()
    00168   {
    00169     struct Task *child = FindTask(NULL);
    00170     struct OTTDThreadStartupMessage *msg;
    00171
    00172     /* Make sure, we don't block the parent. */
    00173     SetTaskPri(child, -5);
    00174
    00175     KPutStr("[Child] Progressing...\n");
    00176
    00177     if (NewGetTaskAttrs(NULL, &msg, sizeof(struct OTTDThreadStartupMessage *), TASKINFOTYPE_STARTUPMSG, TAG_DONE) && msg != NULL) {
    00178       try {
    00179         msg->func(msg->arg);
    00180       } catch(OTTDThreadExitSignal e) {
    00181         KPutStr("[Child] Returned to main()\n");
    00182       } catch(...) {
    00183         NOT_REACHED();
    00184       }
    00185     }
    00186
    00187     /*  Quit the child, exec.library will reply the startup msg internally. */
    00188     KPutStr("[Child] Done.\n");
    00189
    00190     if (self_destruct) delete this;
    00191   }
    00192 };
    00193
    00194 /* static */ bool ThreadObject::New(OTTDThreadFunc proc, void *param, ThreadObject **thread)
    00195 {
    00196   ThreadObject *to = new ThreadObject_MorphOS(proc, param, thread == NULL);
    00197   if (thread != NULL) *thread = to;
    00198   return true;
    00199 }