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Diffstat (limited to 'src/thread/thread_morphos.cpp')
-rw-r--r-- | src/thread/thread_morphos.cpp | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/src/thread/thread_morphos.cpp b/src/thread/thread_morphos.cpp new file mode 100644 index 000000000..abf2cf0cc --- /dev/null +++ b/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; +} |