1 mike 1.2 //%/////////////////////////////////////////////////////////////////////////////
2 //
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3 kumpf 1.17 // Copyright (c) 2000, 2001, 2002 BMC Software, Hewlett-Packard Company, IBM,
4 // The Open Group, Tivoli Systems
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5 mike 1.2 //
6 // Permission is hereby granted, free of charge, to any person obtaining a copy
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7 chip 1.11 // of this software and associated documentation files (the "Software"), to
8 // deal in the Software without restriction, including without limitation the
9 // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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10 mike 1.2 // sell copies of the Software, and to permit persons to whom the Software is
11 // furnished to do so, subject to the following conditions:
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12 kumpf 1.17 //
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13 chip 1.11 // THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
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14 mike 1.2 // ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
15 // "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
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16 chip 1.11 // LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
17 // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
18 // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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19 mike 1.2 // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
20 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21 //
22 //==============================================================================
23 //
24 // Author: Mike Day (mdday@us.ibm.com)
25 //
26 // Modified By: Rudy Schuet (rudy.schuet@compaq.com) 11/12/01
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27 chip 1.11 // added nsk platform support
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28 mike 1.2 //
29 //%/////////////////////////////////////////////////////////////////////////////
30
31 #include "Thread.h"
32 #include <Pegasus/Common/IPC.h>
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33 kumpf 1.14 #include <Pegasus/Common/Tracer.h>
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34 mike 1.2
35 #if defined(PEGASUS_OS_TYPE_WINDOWS)
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36 chip 1.11 # include "ThreadWindows.cpp"
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37 mike 1.2 #elif defined(PEGASUS_OS_TYPE_UNIX)
38 # include "ThreadUnix.cpp"
39 #elif defined(PEGASUS_OS_TYPE_NSK)
40 # include "ThreadNsk.cpp"
41 #else
42 # error "Unsupported platform"
43 #endif
44
45 PEGASUS_NAMESPACE_BEGIN
46
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47 chip 1.11 void thread_data::default_delete(void * data)
48 {
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49 mike 1.2 if( data != NULL)
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50 chip 1.11 ::operator delete(data);
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51 mike 1.2 }
52
53 Boolean Thread::_signals_blocked = false;
54
55 // for non-native implementations
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56 chip 1.11 #ifndef PEGASUS_THREAD_CLEANUP_NATIVE
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57 mike 1.2 void Thread::cleanup_push( void (*routine)(void *), void *parm) throw(IPCException)
58 {
59 cleanup_handler *cu = new cleanup_handler(routine, parm);
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60 chip 1.11 try
61 {
62 _cleanup.insert_first(cu);
63 }
64 catch(IPCException&)
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65 mike 1.2 {
66 delete cu;
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67 chip 1.11 throw;
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68 mike 1.2 }
69 return;
70 }
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71 chip 1.11
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72 mike 1.2 void Thread::cleanup_pop(Boolean execute) throw(IPCException)
73 {
74 cleanup_handler *cu ;
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75 chip 1.11 try
76 {
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77 mike 1.2 cu = _cleanup.remove_first() ;
78 }
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79 chip 1.11 catch(IPCException&)
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80 mike 1.2 {
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81 chip 1.11 PEGASUS_ASSERT(0);
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82 mike 1.2 }
83 if(execute == true)
84 cu->execute();
85 delete cu;
86 }
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87 chip 1.11
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88 mike 1.2 #endif
89
90
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91 kumpf 1.8 //thread_data *Thread::put_tsd(const Sint8 *key, void (*delete_func)(void *), Uint32 size, void *value) throw(IPCException)
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92 mike 1.2
93
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94 chip 1.11 #ifndef PEGASUS_THREAD_EXIT_NATIVE
95 void Thread::exit_self(PEGASUS_THREAD_RETURN exit_code)
96 {
97 // execute the cleanup stack and then return
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98 mike 1.2 while( _cleanup.count() )
99 {
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100 chip 1.11 try
101 {
102 cleanup_pop(true);
103 }
104 catch(IPCException&)
105 {
106 PEGASUS_ASSERT(0);
107 break;
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108 mike 1.2 }
109 }
110 _exit_code = exit_code;
111 exit_thread(exit_code);
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112 mday 1.4 _handle.thid = 0;
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113 mike 1.2 }
114
115
116 #endif
117
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118 mday 1.20 DQueue<ThreadPool> ThreadPool::_pools(true);
119
120
121 void ThreadPool::kill_idle_threads(void)
122 {
123 static struct timeval now, last = {0, 0};
124
125 pegasus_gettimeofday(&now);
126 if(now.tv_sec - last.tv_sec > 5)
127 {
128 _pools.lock();
129 ThreadPool *p = _pools.next(0);
130 while(p != 0)
131 {
132 try
133 {
134 p->kill_dead_threads();
135 }
136 catch(...)
137 {
138 }
139 mday 1.20 p = _pools.next(p);
140 }
141 _pools.unlock();
142 pegasus_gettimeofday(&last);
143 }
144 }
145
146
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147 mike 1.2 ThreadPool::ThreadPool(Sint16 initial_size,
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148 kumpf 1.8 const Sint8 *key,
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149 mike 1.2 Sint16 min,
150 Sint16 max,
151 struct timeval & alloc_wait,
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152 chip 1.11 struct timeval & dealloc_wait,
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153 mike 1.2 struct timeval & deadlock_detect)
154 : _max_threads(max), _min_threads(min),
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155 mday 1.12 _current_threads(0),
156 _pool(true), _running(true),
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157 mike 1.2 _dead(true), _dying(0)
158 {
159 _allocate_wait.tv_sec = alloc_wait.tv_sec;
160 _allocate_wait.tv_usec = alloc_wait.tv_usec;
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161 chip 1.11 _deallocate_wait.tv_sec = dealloc_wait.tv_sec;
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162 mike 1.2 _deallocate_wait.tv_usec = dealloc_wait.tv_usec;
163 _deadlock_detect.tv_sec = deadlock_detect.tv_sec;
164 _deadlock_detect.tv_usec = deadlock_detect.tv_usec;
165 memset(_key, 0x00, 17);
166 if(key != 0)
167 strncpy(_key, key, 16);
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168 mday 1.21 if(_max_threads > 0 && _max_threads < initial_size)
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169 mike 1.2 _max_threads = initial_size;
170 if(_min_threads > initial_size)
171 _min_threads = initial_size;
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172 chip 1.11
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173 mike 1.2 int i;
174 for(i = 0; i < initial_size; i++)
175 {
176 _link_pool(_init_thread());
177 }
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178 mday 1.20 _pools.insert_last(this);
179
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180 mike 1.2 }
181
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182 chip 1.11
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183 mike 1.2
184 ThreadPool::~ThreadPool(void)
185 {
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186 mday 1.19
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187 mday 1.20 _pools.remove(this);
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188 mike 1.2 _dying++;
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189 mday 1.12 Thread *th = 0;
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190 kumpf 1.16 th = _pool.remove_first();
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191 mike 1.2 while(th != 0)
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192 chip 1.11 {
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193 mike 1.2 Semaphore *sleep_sem = (Semaphore *)th->reference_tsd("sleep sem");
194
195 if(sleep_sem == 0)
196 {
197 th->dereference_tsd();
198 throw NullPointer();
199 }
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200 chip 1.11
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201 mike 1.2 sleep_sem->signal();
202 sleep_sem->signal();
203 th->dereference_tsd();
204 // signal the thread's sleep semaphore
205 th->cancel();
206 th->join();
207 th->empty_tsd();
208 delete th;
209 th = _pool.remove_first();
210 }
211
212 th = _running.remove_first();
213 while(th != 0)
214 {
215 // signal the thread's sleep semaphore
216 th->cancel();
217 th->join();
218 th->empty_tsd();
219 delete th;
220 th = _running.remove_first();
221 }
222 mike 1.2
223 th = _dead.remove_first();
224 while(th != 0)
225 {
226 // signal the thread's sleep semaphore
227 th->cancel();
228 th->join();
229 th->empty_tsd();
230 delete th;
231 th = _dead.remove_first();
232 }
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233 mday 1.20
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234 mike 1.2 }
235
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236 chip 1.11 // make this static to the class
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237 mike 1.2 PEGASUS_THREAD_RETURN PEGASUS_THREAD_CDECL ThreadPool::_loop(void *parm)
238 {
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239 kumpf 1.14 PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::_loop");
240
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241 mike 1.2 Thread *myself = (Thread *)parm;
242 if(myself == 0)
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243 kumpf 1.14 {
244 PEG_METHOD_EXIT();
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245 mike 1.2 throw NullPointer();
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246 kumpf 1.14 }
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247 mike 1.2 ThreadPool *pool = (ThreadPool *)myself->get_parm();
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248 kumpf 1.14 if(pool == 0 )
249 {
250 PEG_METHOD_EXIT();
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251 mike 1.2 throw NullPointer();
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252 kumpf 1.14 }
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253 mike 1.5 Semaphore *sleep_sem = 0;
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254 mday 1.13 Semaphore *blocking_sem = 0;
255
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256 mike 1.5 struct timeval *deadlock_timer = 0;
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257 chip 1.11
258 try
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259 mike 1.2 {
260 sleep_sem = (Semaphore *)myself->reference_tsd("sleep sem");
261 myself->dereference_tsd();
262 deadlock_timer = (struct timeval *)myself->reference_tsd("deadlock timer");
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263 mday 1.22 myself->dereference_tsd();
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264 mike 1.2 }
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265 mike 1.6 catch(IPCException &)
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266 mike 1.2 {
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267 kumpf 1.14 PEG_METHOD_EXIT();
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268 mike 1.2 myself->exit_self(0);
269 }
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270 mday 1.30 catch(...)
271 {
272 PEG_METHOD_EXIT();
273 myself->exit_self(0);
274 }
275
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276 mike 1.2 if(sleep_sem == 0 || deadlock_timer == 0)
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277 kumpf 1.14 {
278 PEG_METHOD_EXIT();
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279 mike 1.2 throw NullPointer();
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280 kumpf 1.14 }
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281 mike 1.2
282 while(pool->_dying < 1)
283 {
284 sleep_sem->wait();
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285 mday 1.12
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286 mike 1.2 // when we awaken we reside on the running queue, not the pool queue
287 if(pool->_dying > 0)
288 break;
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289 chip 1.11
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290 mike 1.5 PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *_work)(void *) = 0;
291 void *parm = 0;
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292 mike 1.2
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293 chip 1.11 try
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294 mike 1.2 {
295 _work = (PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *)) \
296 myself->reference_tsd("work func");
297 myself->dereference_tsd();
298 parm = myself->reference_tsd("work parm");
299 myself->dereference_tsd();
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300 mday 1.13 blocking_sem = (Semaphore *)myself->reference_tsd("blocking sem");
301 myself->dereference_tsd();
302
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303 mike 1.2 }
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304 mike 1.6 catch(IPCException &)
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305 mike 1.2 {
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306 kumpf 1.14 PEG_METHOD_EXIT();
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307 mike 1.2 myself->exit_self(0);
308 }
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309 chip 1.11
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310 mike 1.2 if(_work == 0)
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311 kumpf 1.14 {
312 PEG_METHOD_EXIT();
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313 mike 1.2 throw NullPointer();
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314 kumpf 1.14 }
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315 kumpf 1.24
316 if(_work ==
317 (PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *)) &_undertaker)
318 {
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319 mday 1.23 _work(parm);
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320 kumpf 1.24 }
321
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322 mike 1.2 gettimeofday(deadlock_timer, NULL);
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323 mday 1.20 try
324 {
325 _work(parm);
326 }
327 catch(...)
328 {
329 gettimeofday(deadlock_timer, NULL);
330 }
331 gettimeofday(deadlock_timer, NULL);
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332 mday 1.13 if( blocking_sem != 0 )
333 blocking_sem->signal();
334
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335 chip 1.11 // put myself back onto the available list
336 try
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337 mike 1.2 {
338 pool->_running.remove((void *)myself);
339 pool->_link_pool(myself);
340 }
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341 mike 1.6 catch(IPCException &)
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342 mike 1.2 {
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343 kumpf 1.14 PEG_METHOD_EXIT();
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344 mike 1.2 myself->exit_self(0);
345 }
346 }
347 // wait to be awakend by the thread pool destructor
348 sleep_sem->wait();
349 myself->test_cancel();
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350 kumpf 1.14
351 PEG_METHOD_EXIT();
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352 mike 1.2 myself->exit_self(0);
353 return((PEGASUS_THREAD_RETURN)0);
354 }
355
356 void ThreadPool::allocate_and_awaken(void *parm,
357 PEGASUS_THREAD_RETURN \
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358 mday 1.13 (PEGASUS_THREAD_CDECL *work)(void *),
359 Semaphore *blocking)
360
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361 mike 1.2 throw(IPCException)
362 {
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363 kumpf 1.14 PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::allocate_and_awaken");
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364 mike 1.2 struct timeval start;
365 gettimeofday(&start, NULL);
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366 chip 1.11
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367 mike 1.2 Thread *th = _pool.remove_first();
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368 mday 1.12
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369 mday 1.7 // wait for the right interval and try again
370 while(th == 0 && _dying < 1)
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371 mike 1.2 {
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372 mday 1.12 _check_deadlock(&start) ;
373
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374 mday 1.21 if(_max_threads == 0 || _current_threads < _max_threads)
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375 mike 1.2 {
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376 mday 1.12 th = _init_thread();
377 continue;
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378 mike 1.2 }
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379 mday 1.12 pegasus_yield();
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380 mday 1.7 th = _pool.remove_first();
381 }
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382 chip 1.11
383
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384 mike 1.2 if(_dying < 1)
385 {
386 // initialize the thread data with the work function and parameters
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387 kumpf 1.14 Tracer::trace(TRC_THREAD, Tracer::LEVEL4,
388 "Initializing thread with work function and parameters: parm = %p",
389 parm);
390
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391 kumpf 1.15 th->delete_tsd("work func");
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392 chip 1.11 th->put_tsd("work func", NULL,
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393 mike 1.2 sizeof( PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *)),
394 (void *)work);
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395 kumpf 1.15 th->delete_tsd("work parm");
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396 mike 1.2 th->put_tsd("work parm", NULL, sizeof(void *), parm);
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397 kumpf 1.15 th->delete_tsd("blocking sem");
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398 mday 1.13 if(blocking != 0 )
399 th->put_tsd("blocking sem", NULL, sizeof(Semaphore *), blocking);
400
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401 chip 1.11 // put the thread on the running list
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402 mike 1.2 _running.insert_first(th);
403
404 // signal the thread's sleep semaphore to awaken it
405 Semaphore *sleep_sem = (Semaphore *)th->reference_tsd("sleep sem");
406
407 if(sleep_sem == 0)
408 {
409 th->dereference_tsd();
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410 kumpf 1.14 PEG_METHOD_EXIT();
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411 mike 1.2 throw NullPointer();
412 }
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413 kumpf 1.14 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, "Signal thread to awaken");
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414 mike 1.2 sleep_sem->signal();
415 th->dereference_tsd();
416 }
417 else
418 _pool.insert_first(th);
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419 kumpf 1.14
420 PEG_METHOD_EXIT();
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421 mike 1.2 }
422
423 // caller is responsible for only calling this routine during slack periods
424 // but should call it at least once per _deadlock_detect with the running q
425 // and at least once per _deallocate_wait for the pool q
426
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427 mday 1.12 Uint32 ThreadPool::kill_dead_threads(void)
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428 mike 1.2 throw(IPCException)
429 {
430 struct timeval now;
431 gettimeofday(&now, NULL);
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432 mday 1.12 Uint32 bodies = 0;
433
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434 mike 1.2 // first go thread the dead q and clean it up as much as possible
435 while(_dead.count() > 0)
436 {
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437 mday 1.30 PEGASUS_STD(cout) << "ThreadPool:: removing and joining dead thread" << PEGASUS_STD(endl);
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438 mike 1.2 Thread *dead = _dead.remove_first();
439 if(dead == 0)
440 throw NullPointer();
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441 mday 1.30 dead->join();
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442 mike 1.2 delete dead;
443 }
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444 chip 1.11
445 DQueue<Thread> * map[2] =
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446 mike 1.2 {
447 &_pool, &_running
448 };
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449 chip 1.11
450
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451 mike 1.2 DQueue<Thread> *q = 0;
452 int i = 0;
453 AtomicInt needed(0);
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454 chip 1.11
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455 mday 1.26
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456 mday 1.30 for( ; i < 2; i++)
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457 mday 1.21 {
458 q = map[i];
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459 mike 1.2 if(q->count() > 0 )
460 {
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461 chip 1.11 try
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462 mike 1.2 {
463 q->try_lock();
464 }
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465 mday 1.18 catch(...)
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466 mike 1.2 {
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467 mday 1.18 return bodies;
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468 mike 1.2 }
469
470 struct timeval dt = { 0, 0 };
471 struct timeval *dtp;
472 Thread *th = 0;
473 th = q->next(th);
474 while (th != 0 )
475 {
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476 chip 1.11 try
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477 mike 1.2 {
478 dtp = (struct timeval *)th->try_reference_tsd("deadlock timer");
479 }
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480 mday 1.18 catch(...)
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481 mike 1.2 {
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482 kumpf 1.25 q->unlock();
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483 mday 1.18 return bodies;
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484 mike 1.2 }
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485 chip 1.11
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486 mike 1.2 if(dtp != 0)
487 {
488 memcpy(&dt, dtp, sizeof(struct timeval));
489 }
490 th->dereference_tsd();
491 struct timeval deadlock_timeout;
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492 mday 1.18 Boolean too_long;
493 if( i == 0)
494 {
495 too_long = check_time(&dt, get_deallocate_wait(&deadlock_timeout));
496 }
497 else
498 {
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499 mday 1.22 too_long = check_time(&dt, get_deadlock_detect(&deadlock_timeout));
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500 mday 1.18 }
501
502 if( true == too_long)
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503 mike 1.2 {
504 // if we are deallocating from the pool, escape if we are
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505 chip 1.11 // down to the minimum thread count
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506 mday 1.13 _current_threads--;
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507 mday 1.18 if( _current_threads.value() < (Uint32)_min_threads )
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508 mike 1.2 {
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509 mday 1.13 if( i == 0)
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510 mike 1.2 {
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511 mday 1.13 _current_threads++;
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512 mike 1.2 th = q->next(th);
513 continue;
514 }
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515 chip 1.11 else
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516 mike 1.2 {
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517 chip 1.11 // we are killing a hung thread and we will drop below the
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518 mike 1.2 // minimum. create another thread to make up for the one
519 // we are about to kill
520 needed++;
521 }
522 }
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523 chip 1.11
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524 mike 1.2 th = q->remove_no_lock((void *)th);
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525 chip 1.11
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526 mike 1.2 if(th != 0)
527 {
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528 mday 1.30 if( i == 0 )
|
529 mike 1.2 {
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530 mday 1.30 th->delete_tsd("work func");
531 th->put_tsd("work func", NULL,
532 sizeof( PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *)),
533 (void *)&_undertaker);
534 th->delete_tsd("work parm");
535 th->put_tsd("work parm", NULL, sizeof(void *), th);
536
537 // signal the thread's sleep semaphore to awaken it
538 Semaphore *sleep_sem = (Semaphore *)th->reference_tsd("sleep sem");
539
540 if(sleep_sem == 0)
541 {
542 q->unlock();
543 th->dereference_tsd();
544 throw NullPointer();
545 }
546
547 bodies++;
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548 mike 1.2 th->dereference_tsd();
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549 mday 1.30 _dead.insert_first(th);
550 sleep_sem->signal();
551 th = 0;
552 }
553 else
554 {
555 // deadlocked threads
556 PEGASUS_STD(cout) << "Killing a deadlocked thread" << PEGASUS_STD(endl);
557 th->cancel();
558 delete th;
|
559 mike 1.2 }
560 }
561 }
562 th = q->next(th);
|
563 mday 1.20 pegasus_sleep(1);
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564 mike 1.2 }
565 q->unlock();
566 while (needed.value() > 0)
567 {
568 _link_pool(_init_thread());
569 needed--;
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570 mday 1.20 pegasus_sleep(0);
|
571 mike 1.2 }
572 }
573 }
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574 mday 1.18 return bodies;
|
575 mike 1.2 }
576
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577 mday 1.12
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578 mike 1.2 Boolean ThreadPool::check_time(struct timeval *start, struct timeval *interval)
579 {
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580 mday 1.22 // never time out if the interval is zero
581 if(interval && interval->tv_sec == 0 && interval->tv_usec == 0)
582 return false;
583
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584 mday 1.13 struct timeval now, finish, remaining;
585 Uint32 usec;
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586 mike 1.2 gettimeofday(&now, NULL);
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587 mday 1.13
588 finish.tv_sec = start->tv_sec + interval->tv_sec;
589 usec = start->tv_usec + interval->tv_usec;
590 finish.tv_sec += (usec / 1000000);
591 usec %= 1000000;
592 finish.tv_usec = usec;
593
594 if ( timeval_subtract(&remaining, &finish, &now) )
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595 mike 1.2 return true;
596 else
597 return false;
598 }
599
600 PEGASUS_THREAD_RETURN ThreadPool::_undertaker( void *parm )
601 {
|
602 mday 1.30 exit_thread((PEGASUS_THREAD_RETURN)1);
603 return (PEGASUS_THREAD_RETURN)1;
|
604 mike 1.2 }
|
605 mday 1.19
606
607 void ThreadPool::_sleep_sem_del(void *p)
608 {
609 if(p != 0)
610 {
611 delete (Semaphore *)p;
612 }
613 }
614
615 void ThreadPool::_check_deadlock(struct timeval *start) throw(Deadlock)
616 {
617 if (true == check_time(start, &_deadlock_detect))
618 throw Deadlock(pegasus_thread_self());
619 return;
620 }
621
622
623 Boolean ThreadPool::_check_deadlock_no_throw(struct timeval *start)
624 {
625 return(check_time(start, &_deadlock_detect));
626 mday 1.19 }
627
628 Boolean ThreadPool::_check_dealloc(struct timeval *start)
629 {
630 return(check_time(start, &_deallocate_wait));
631 }
632
633 Thread *ThreadPool::_init_thread(void) throw(IPCException)
634 {
635 Thread *th = (Thread *) new Thread(_loop, this, false);
636 // allocate a sleep semaphore and pass it in the thread context
637 // initial count is zero, loop function will sleep until
638 // we signal the semaphore
639 Semaphore *sleep_sem = (Semaphore *) new Semaphore(0);
640 th->put_tsd("sleep sem", &_sleep_sem_del, sizeof(Semaphore), (void *)sleep_sem);
641
642 struct timeval *dldt = (struct timeval *) ::operator new(sizeof(struct timeval));
643 th->put_tsd("deadlock timer", thread_data::default_delete, sizeof(struct timeval), (void *)dldt);
644 // thread will enter _loop(void *) and sleep on sleep_sem until we signal it
645 th->run();
646 _current_threads++;
647 mday 1.19 pegasus_yield();
648
649 return th;
650 }
651
652 void ThreadPool::_link_pool(Thread *th) throw(IPCException)
653 {
654 if(th == 0)
655 throw NullPointer();
656 _pool.insert_first(th);
657 }
658
|
659 mike 1.2
660
661 PEGASUS_NAMESPACE_END
662
|
Return to
Thread.cpp
CVS log
Up to [Pegasus] / pegasus / src / Pegasus / Common