1 |
/* |
2 |
* HT Editor |
3 |
* thread.cc |
4 |
* |
5 |
* Copyright (C) 2003 Sebastian Biallas (sb@biallas.net) |
6 |
* |
7 |
* This program is free software; you can redistribute it and/or modify |
8 |
* it under the terms of the GNU General Public License version 2 as |
9 |
* published by the Free Software Foundation. |
10 |
* |
11 |
* This program is distributed in the hope that it will be useful, |
12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 |
* GNU General Public License for more details. |
15 |
* |
16 |
* You should have received a copy of the GNU General Public License |
17 |
* along with this program; if not, write to the Free Software |
18 |
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
19 |
*/ |
20 |
|
21 |
#include <cstdio> |
22 |
#include <cstdlib> |
23 |
|
24 |
#include "debug.h" |
25 |
#include "except.h" |
26 |
#include "thread.h" |
27 |
|
28 |
static void *start_thread_routine(void *t) |
29 |
{ |
30 |
Thread *thread = ((Thread *)t); |
31 |
thread->setState(threadRunning); |
32 |
void *ret = thread->run(); |
33 |
if (thread->getState() == threadRunning) { |
34 |
/* |
35 |
* Thread reached end of run(), and most likely |
36 |
* didn't call terminate(), so we do here |
37 |
*/ |
38 |
thread->terminate(ret); |
39 |
} |
40 |
return ret; |
41 |
} |
42 |
|
43 |
Thread::Thread() |
44 |
{ |
45 |
mThreadValid = false; |
46 |
mState = threadInited; |
47 |
mSem = new Semaphore(); |
48 |
} |
49 |
|
50 |
Thread::~Thread() |
51 |
{ |
52 |
if (mState == threadStarting || mState == threadRunning) { |
53 |
// in a perfect world, we'd throw an exception here |
54 |
fprintf(stderr, "Attempt to kill running thread!\n"); |
55 |
// but world isn't perfect |
56 |
exit(1); |
57 |
} |
58 |
if (mThreadValid) { |
59 |
sys_destroy_thread(mThread); |
60 |
} |
61 |
} |
62 |
|
63 |
void Thread::start(void *param) |
64 |
{ |
65 |
setState(threadStarting); |
66 |
mThreadValid = true; |
67 |
sys_create_thread(&mThread, 0, start_thread_routine, this); |
68 |
} |
69 |
|
70 |
ThreadState Thread::getState() |
71 |
{ |
72 |
return mState; |
73 |
} |
74 |
|
75 |
void Thread::setState(ThreadState state) |
76 |
{ |
77 |
mSem->lock(); |
78 |
mState = state; |
79 |
mSem->signalAll(); |
80 |
mSem->unlock(); |
81 |
} |
82 |
|
83 |
void *Thread::waitForExit() |
84 |
{ |
85 |
mSem->lock(); |
86 |
while (mState == threadStarting) { |
87 |
mSem->wait(); |
88 |
} |
89 |
mSem->unlock(); |
90 |
mSem->lock(); |
91 |
while (mState == threadRunning) { |
92 |
mSem->wait(); |
93 |
} |
94 |
mSem->unlock(); |
95 |
return NULL; |
96 |
} |
97 |
|
98 |
void Thread::waitForRunning() |
99 |
{ |
100 |
mSem->lock(); |
101 |
while (mState == threadStarting) { |
102 |
mSem->wait(); |
103 |
} |
104 |
mSem->unlock(); |
105 |
} |
106 |
|
107 |
void Thread::terminate(void *ret) |
108 |
{ |
109 |
if (mState == threadRunning) { |
110 |
ASSERT(mThreadValid); |
111 |
setState(threadFinished); |
112 |
sys_exit_thread(ret); |
113 |
} else { |
114 |
throw MsgException("Arrrrrrg. Please read the docu. You musn't call terminate() from outside the thread."); |
115 |
} |
116 |
} |
117 |
|
118 |
/* |
119 |
* |
120 |
*/ |
121 |
ThreadFunction::ThreadFunction(sys_thread_function f, void *aParam) |
122 |
:Thread() |
123 |
{ |
124 |
mFunc = f; |
125 |
mParam = aParam; |
126 |
} |
127 |
|
128 |
void *ThreadFunction::run() |
129 |
{ |
130 |
terminate(mFunc(mParam)); |
131 |
// terminate does not return |
132 |
return NULL; |
133 |
} |
134 |
|
135 |
/* |
136 |
* |
137 |
*/ |
138 |
Mutex::Mutex() |
139 |
{ |
140 |
sys_create_mutex(&mutex); |
141 |
} |
142 |
|
143 |
Mutex::~Mutex() |
144 |
{ |
145 |
sys_destroy_mutex(mutex); |
146 |
} |
147 |
|
148 |
void Mutex::lock() |
149 |
{ |
150 |
sys_lock_mutex(mutex); |
151 |
} |
152 |
|
153 |
void Mutex::unlock() |
154 |
{ |
155 |
sys_unlock_mutex(mutex); |
156 |
} |
157 |
|
158 |
int Mutex::trylock() |
159 |
{ |
160 |
return sys_trylock_mutex(mutex); |
161 |
} |
162 |
|
163 |
/* |
164 |
* |
165 |
*/ |
166 |
|
167 |
Semaphore::Semaphore() |
168 |
{ |
169 |
sys_create_semaphore(&sem); |
170 |
} |
171 |
|
172 |
Semaphore::~Semaphore() |
173 |
{ |
174 |
sys_destroy_semaphore(sem); |
175 |
} |
176 |
|
177 |
void Semaphore::signal() |
178 |
{ |
179 |
sys_signal_semaphore(sem); |
180 |
} |
181 |
|
182 |
void Semaphore::signalAll() |
183 |
{ |
184 |
sys_signal_all_semaphore(sem); |
185 |
} |
186 |
|
187 |
void Semaphore::wait() |
188 |
{ |
189 |
sys_wait_semaphore(sem); |
190 |
} |
191 |
|
192 |
void Semaphore::lock() |
193 |
{ |
194 |
sys_lock_semaphore(sem); |
195 |
} |
196 |
|
197 |
void Semaphore::unlock() |
198 |
{ |
199 |
sys_unlock_semaphore(sem); |
200 |
} |
201 |
|