1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
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;
}
|
