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 }
270 if(sleep_sem == 0 || deadlock_timer == 0)
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271 kumpf 1.14 {
272 PEG_METHOD_EXIT();
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273 mike 1.2 throw NullPointer();
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274 kumpf 1.14 }
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275 mike 1.2
276 while(pool->_dying < 1)
277 {
278 sleep_sem->wait();
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279 mday 1.12
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280 mike 1.2 // when we awaken we reside on the running queue, not the pool queue
281 if(pool->_dying > 0)
282 break;
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283 chip 1.11
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284 mike 1.5 PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *_work)(void *) = 0;
285 void *parm = 0;
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286 mike 1.2
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287 chip 1.11 try
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288 mike 1.2 {
289 _work = (PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *)) \
290 myself->reference_tsd("work func");
291 myself->dereference_tsd();
292 parm = myself->reference_tsd("work parm");
293 myself->dereference_tsd();
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294 mday 1.13 blocking_sem = (Semaphore *)myself->reference_tsd("blocking sem");
295 myself->dereference_tsd();
296
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297 mike 1.2 }
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298 mike 1.6 catch(IPCException &)
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299 mike 1.2 {
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300 kumpf 1.14 PEG_METHOD_EXIT();
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301 mike 1.2 myself->exit_self(0);
302 }
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303 chip 1.11
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304 mike 1.2 if(_work == 0)
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305 kumpf 1.14 {
306 PEG_METHOD_EXIT();
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307 mike 1.2 throw NullPointer();
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308 kumpf 1.14 }
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309 mike 1.2 gettimeofday(deadlock_timer, NULL);
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310 mday 1.20 try
311 {
312 _work(parm);
313 }
314 catch(...)
315 {
316 gettimeofday(deadlock_timer, NULL);
317 }
318 gettimeofday(deadlock_timer, NULL);
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319 mday 1.13 if( blocking_sem != 0 )
320 blocking_sem->signal();
321
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322 chip 1.11 // put myself back onto the available list
323 try
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324 mike 1.2 {
325 pool->_running.remove((void *)myself);
326 pool->_link_pool(myself);
327 }
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328 mike 1.6 catch(IPCException &)
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329 mike 1.2 {
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330 kumpf 1.14 PEG_METHOD_EXIT();
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331 mike 1.2 myself->exit_self(0);
332 }
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333 mday 1.29.2.1
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334 mike 1.2 }
335 // wait to be awakend by the thread pool destructor
336 sleep_sem->wait();
337 myself->test_cancel();
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338 kumpf 1.14
339 PEG_METHOD_EXIT();
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340 mike 1.2 myself->exit_self(0);
341 return((PEGASUS_THREAD_RETURN)0);
342 }
343
344 void ThreadPool::allocate_and_awaken(void *parm,
345 PEGASUS_THREAD_RETURN \
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346 mday 1.13 (PEGASUS_THREAD_CDECL *work)(void *),
347 Semaphore *blocking)
348
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349 mike 1.2 throw(IPCException)
350 {
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351 kumpf 1.14 PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::allocate_and_awaken");
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352 mike 1.2 struct timeval start;
353 gettimeofday(&start, NULL);
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354 chip 1.11
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355 mike 1.2 Thread *th = _pool.remove_first();
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356 mday 1.12
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357 mday 1.7 // wait for the right interval and try again
358 while(th == 0 && _dying < 1)
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359 mike 1.2 {
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360 mday 1.12 _check_deadlock(&start) ;
361
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362 mday 1.21 if(_max_threads == 0 || _current_threads < _max_threads)
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363 mike 1.2 {
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364 mday 1.12 th = _init_thread();
365 continue;
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366 mike 1.2 }
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367 mday 1.12 pegasus_yield();
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368 mday 1.7 th = _pool.remove_first();
369 }
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370 chip 1.11
371
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372 mike 1.2 if(_dying < 1)
373 {
374 // initialize the thread data with the work function and parameters
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375 kumpf 1.14 Tracer::trace(TRC_THREAD, Tracer::LEVEL4,
376 "Initializing thread with work function and parameters: parm = %p",
377 parm);
378
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379 kumpf 1.15 th->delete_tsd("work func");
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380 chip 1.11 th->put_tsd("work func", NULL,
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381 mike 1.2 sizeof( PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *)),
382 (void *)work);
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383 kumpf 1.15 th->delete_tsd("work parm");
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384 mike 1.2 th->put_tsd("work parm", NULL, sizeof(void *), parm);
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385 kumpf 1.15 th->delete_tsd("blocking sem");
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386 mday 1.13 if(blocking != 0 )
387 th->put_tsd("blocking sem", NULL, sizeof(Semaphore *), blocking);
388
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389 chip 1.11 // put the thread on the running list
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390 mike 1.2 _running.insert_first(th);
391
392 // signal the thread's sleep semaphore to awaken it
393 Semaphore *sleep_sem = (Semaphore *)th->reference_tsd("sleep sem");
394
395 if(sleep_sem == 0)
396 {
397 th->dereference_tsd();
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398 kumpf 1.14 PEG_METHOD_EXIT();
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399 mike 1.2 throw NullPointer();
400 }
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401 kumpf 1.14 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, "Signal thread to awaken");
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402 mike 1.2 sleep_sem->signal();
403 th->dereference_tsd();
404 }
405 else
406 _pool.insert_first(th);
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407 kumpf 1.14
408 PEG_METHOD_EXIT();
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409 mike 1.2 }
410
411 // caller is responsible for only calling this routine during slack periods
412 // but should call it at least once per _deadlock_detect with the running q
413 // and at least once per _deallocate_wait for the pool q
414
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415 mday 1.12 Uint32 ThreadPool::kill_dead_threads(void)
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416 mike 1.2 throw(IPCException)
417 {
418 struct timeval now;
419 gettimeofday(&now, NULL);
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420 mday 1.12 Uint32 bodies = 0;
421
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422 mike 1.2 // first go thread the dead q and clean it up as much as possible
423 while(_dead.count() > 0)
424 {
425 Thread *dead = _dead.remove_first();
426 if(dead == 0)
427 throw NullPointer();
428 if(dead->_handle.thid != 0)
429 {
430 dead->detach();
431 destroy_thread(dead->_handle.thid, 0);
432 dead->_handle.thid = 0;
433 while(dead->_cleanup.count() )
434 {
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435 chip 1.11 // this may throw a permission exception,
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436 mike 1.2 // which I will remove from the code prior to stabilizing
437 dead->cleanup_pop(true);
438 }
439 }
440 delete dead;
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441 mday 1.20 pegasus_sleep(1);
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442 mike 1.2 }
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443 chip 1.11
444 DQueue<Thread> * map[2] =
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445 mike 1.2 {
446 &_pool, &_running
447 };
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448 chip 1.11
449
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450 mike 1.2 DQueue<Thread> *q = 0;
451 int i = 0;
452 AtomicInt needed(0);
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453 chip 1.11
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454 mday 1.29.2.1 for( ; i < 2; i++)
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455 mday 1.21 {
456 q = map[i];
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457 mike 1.2 if(q->count() > 0 )
458 {
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459 chip 1.11 try
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460 mike 1.2 {
461 q->try_lock();
462 }
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463 mday 1.18 catch(...)
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464 mike 1.2 {
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465 mday 1.18 return bodies;
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466 mike 1.2 }
467
468 struct timeval dt = { 0, 0 };
469 struct timeval *dtp;
470 Thread *th = 0;
471 th = q->next(th);
472 while (th != 0 )
473 {
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474 chip 1.11 try
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475 mike 1.2 {
476 dtp = (struct timeval *)th->try_reference_tsd("deadlock timer");
477 }
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478 mday 1.18 catch(...)
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479 mike 1.2 {
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480 mday 1.18 return bodies;
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481 mike 1.2 }
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482 chip 1.11
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483 mike 1.2 if(dtp != 0)
484 {
485 memcpy(&dt, dtp, sizeof(struct timeval));
486 }
487 th->dereference_tsd();
488 struct timeval deadlock_timeout;
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489 mday 1.18 Boolean too_long;
490 if( i == 0)
491 {
492 too_long = check_time(&dt, get_deallocate_wait(&deadlock_timeout));
493 }
494 else
495 {
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496 mday 1.22 too_long = check_time(&dt, get_deadlock_detect(&deadlock_timeout));
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497 mday 1.18 }
498
499 if( true == too_long)
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500 mike 1.2 {
501 // if we are deallocating from the pool, escape if we are
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502 chip 1.11 // down to the minimum thread count
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503 mday 1.13 _current_threads--;
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504 mday 1.18 if( _current_threads.value() < (Uint32)_min_threads )
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505 mike 1.2 {
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506 mday 1.13 if( i == 0)
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507 mike 1.2 {
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508 mday 1.13 _current_threads++;
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509 mike 1.2 th = q->next(th);
510 continue;
511 }
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512 chip 1.11 else
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513 mike 1.2 {
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514 chip 1.11 // we are killing a hung thread and we will drop below the
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515 mike 1.2 // minimum. create another thread to make up for the one
516 // we are about to kill
517 needed++;
518 }
519 }
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520 chip 1.11
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521 mike 1.2 th = q->remove_no_lock((void *)th);
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522 chip 1.11
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523 mike 1.2 if(th != 0)
524 {
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525 mday 1.18
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526 kumpf 1.15 th->delete_tsd("work func");
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527 chip 1.11 th->put_tsd("work func", NULL,
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528 mike 1.2 sizeof( PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *)),
529 (void *)&_undertaker);
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530 kumpf 1.15 th->delete_tsd("work parm");
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531 mike 1.2 th->put_tsd("work parm", NULL, sizeof(void *), th);
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532 chip 1.11
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533 mike 1.2 // signal the thread's sleep semaphore to awaken it
534 Semaphore *sleep_sem = (Semaphore *)th->reference_tsd("sleep sem");
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535 chip 1.11
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536 mike 1.2 if(sleep_sem == 0)
537 {
538 th->dereference_tsd();
539 throw NullPointer();
540 }
|
541 mday 1.18
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542 chip 1.11 // put the thread on the dead list
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543 kumpf 1.28 _dead.insert_first(th);
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544 mday 1.12 bodies++;
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545 chip 1.11 sleep_sem->signal();
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546 mday 1.13
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547 mike 1.2 th->dereference_tsd();
548 th = 0;
549 }
550 }
551 th = q->next(th);
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552 mday 1.20 pegasus_sleep(1);
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553 mike 1.2 }
554 q->unlock();
555 while (needed.value() > 0)
556 {
557 _link_pool(_init_thread());
558 needed--;
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559 mday 1.20 pegasus_sleep(0);
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560 mike 1.2 }
561 }
562 }
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563 mday 1.18 return bodies;
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564 mike 1.2 }
565
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566 mday 1.12
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567 mike 1.2 Boolean ThreadPool::check_time(struct timeval *start, struct timeval *interval)
568 {
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569 mday 1.22 // never time out if the interval is zero
570 if(interval && interval->tv_sec == 0 && interval->tv_usec == 0)
571 return false;
572
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573 mday 1.13 struct timeval now, finish, remaining;
574 Uint32 usec;
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575 mike 1.2 gettimeofday(&now, NULL);
|
576 mday 1.13
577 finish.tv_sec = start->tv_sec + interval->tv_sec;
578 usec = start->tv_usec + interval->tv_usec;
579 finish.tv_sec += (usec / 1000000);
580 usec %= 1000000;
581 finish.tv_usec = usec;
582
583 if ( timeval_subtract(&remaining, &finish, &now) )
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584 mike 1.2 return true;
585 else
586 return false;
587 }
588
589
590 PEGASUS_THREAD_RETURN ThreadPool::_undertaker( void *parm )
591 {
592 Thread *myself = reinterpret_cast<Thread *>(parm);
593 if(myself != 0)
594 {
595 myself->detach();
596 myself->_handle.thid = 0;
597 myself->cancel();
|
598 kumpf 1.28 myself->test_cancel();
599 myself->exit_self(0);
|
600 mike 1.2 }
601 return((PEGASUS_THREAD_RETURN)0);
602 }
|
603 mday 1.19
604
605 void ThreadPool::_sleep_sem_del(void *p)
606 {
607 if(p != 0)
608 {
609 delete (Semaphore *)p;
610 }
611 }
612
613 void ThreadPool::_check_deadlock(struct timeval *start) throw(Deadlock)
614 {
615 if (true == check_time(start, &_deadlock_detect))
616 throw Deadlock(pegasus_thread_self());
617 return;
618 }
619
620
621 Boolean ThreadPool::_check_deadlock_no_throw(struct timeval *start)
622 {
623 return(check_time(start, &_deadlock_detect));
624 mday 1.19 }
625
626 Boolean ThreadPool::_check_dealloc(struct timeval *start)
627 {
628 return(check_time(start, &_deallocate_wait));
629 }
630
631 Thread *ThreadPool::_init_thread(void) throw(IPCException)
632 {
633 Thread *th = (Thread *) new Thread(_loop, this, false);
634 // allocate a sleep semaphore and pass it in the thread context
635 // initial count is zero, loop function will sleep until
636 // we signal the semaphore
637 Semaphore *sleep_sem = (Semaphore *) new Semaphore(0);
638 th->put_tsd("sleep sem", &_sleep_sem_del, sizeof(Semaphore), (void *)sleep_sem);
639
640 struct timeval *dldt = (struct timeval *) ::operator new(sizeof(struct timeval));
641 th->put_tsd("deadlock timer", thread_data::default_delete, sizeof(struct timeval), (void *)dldt);
642 // thread will enter _loop(void *) and sleep on sleep_sem until we signal it
643 th->run();
644 _current_threads++;
645 mday 1.19 pegasus_yield();
646
647 return th;
648 }
649
650 void ThreadPool::_link_pool(Thread *th) throw(IPCException)
651 {
652 if(th == 0)
653 throw NullPointer();
654 _pool.insert_first(th);
655 }
656
|
657 mike 1.2
658
659 PEGASUS_NAMESPACE_END
660
|
Return to
Thread.cpp
CVS log
Up to [Pegasus] / pegasus / src / Pegasus / Common