1 // Copyright (C) 2004 OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
2 // CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
4 // This library is free software; you can redistribute it and/or
5 // modify it under the terms of the GNU Lesser General Public
6 // License as published by the Free Software Foundation; either
7 // version 2.1 of the License.
9 // This library is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 // Lesser General Public License for more details.
14 // You should have received a copy of the GNU Lesser General Public
15 // License along with this library; if not, write to the Free Software
16 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
20 // Author : Paul RASCLE (EDF)
24 // Cf. C++ Users Journal, June 2004, Tracing Application Execution, Tomer Abramson
38 #include "LocalTraceBufferPool.hxx"
39 #include "BaseTraceCollector.hxx"
40 #include "LocalTraceCollector.hxx"
41 #include "FileTraceCollector.hxx"
42 #include "BasicsGenericDestructor.hxx"
43 #include "utilities.h"
47 // In case of truncated message, end of trace contains "...\n\0"
49 #define TRUNCATED_MESSAGE "...\n"
50 #define MAXMESS_LENGTH MAX_TRACE_LENGTH-5
52 // Class static attributes initialisation
54 LocalTraceBufferPool* LocalTraceBufferPool::_singleton = 0;
56 //pthread_mutex_t LocalTraceBufferPool::_singletonMutex;
58 pthread_mutex_t LocalTraceBufferPool::_singletonMutex =
59 PTHREAD_MUTEX_INITIALIZER;
61 BaseTraceCollector *LocalTraceBufferPool::_myThreadTrace = 0;
63 // ============================================================================
65 * Guarantees a unique object instance of the class (singleton thread safe).
66 * When the LocalTraceBufferPool instance is created, the trace collector is
67 * also created (singleton). Type of trace collector to create depends on
68 * environment variable "SALOME_trace":
69 * - "local" implies standard err trace, LocalTraceCollector is launched.
70 * - "file" implies trace in /tmp/tracetest.log
71 * - "file:pathname" implies trace in file pathname
72 * - anything else like "other" : try to load dynamically a library named
73 * otherTraceCollector, and invoque C method instance() to start a singleton
74 * instance of the trace collector. Example: with_loggerTraceCollector, for
77 // ============================================================================
79 LocalTraceBufferPool* LocalTraceBufferPool::instance()
81 if (_singleton == 0) // no need of lock when singleton already exists
84 ret = pthread_mutex_lock(&_singletonMutex); // acquire lock to be alone
85 if (_singleton == 0) // another thread may have got
86 { // the lock after the first test
87 DEVTRACE("New buffer pool");
88 LocalTraceBufferPool* myInstance = new LocalTraceBufferPool();
90 DESTRUCTOR_OF<LocalTraceBufferPool> *ptrDestroy =
91 new DESTRUCTOR_OF<LocalTraceBufferPool> (*myInstance);
92 _singleton = myInstance;
94 // --- start a trace Collector
97 bool isNotDefined = false;
98 if ( getenv("SALOME_trace") )
99 traceKind = getenv("SALOME_trace");
101 isNotDefined = true; // mkr : 27.11.2006 : PAL13967 - Distributed supervision graphs - Problem with "SALOME_trace"
104 //cerr<<"SALOME_trace="<<traceKind<<endl;
106 if ( isNotDefined || strcmp(traceKind,"local")==0 )
108 _myThreadTrace = LocalTraceCollector::instance();
110 else if (strncmp(traceKind,"file",strlen("file"))==0)
113 if (strlen(traceKind) > strlen("file"))
114 fileName = &traceKind[strlen("file")+1];
116 fileName = "/tmp/tracetest.log";
118 _myThreadTrace = FileTraceCollector::instance(fileName);
120 else // --- try a dynamic library
124 string impl_name = string ("lib") + traceKind
125 + string("TraceCollector.so");
126 handle = dlopen( impl_name.c_str() , RTLD_LAZY ) ;
129 string impl_name = string ("lib") + traceKind + string(".dll");
130 handle = LoadLibrary( impl_name.c_str() );
134 typedef BaseTraceCollector * (*FACTORY_FUNCTION) (void);
136 FACTORY_FUNCTION TraceCollectorFactory =
137 (FACTORY_FUNCTION) dlsym(handle, "SingletonInstance");
139 FACTORY_FUNCTION TraceCollectorFactory =
140 (FACTORY_FUNCTION)GetProcAddress(handle, "SingletonInstance");
142 if ( !TraceCollectorFactory )
144 cerr << "Can't resolve symbol: SingletonInstance" <<endl;
146 cerr << "dlerror: " << dlerror() << endl;
150 _myThreadTrace = (TraceCollectorFactory) ();
154 cerr << "library: " << impl_name << " not found !" << endl;
155 assert(handle); // to give file and line
156 exit(1); // in case assert is deactivated
159 DEVTRACE("New buffer pool: end");
161 ret = pthread_mutex_unlock(&_singletonMutex); // release lock
166 // ============================================================================
168 * Called by trace producers within their threads. The trace message is copied
169 * in specific buffer from a circular pool of buffers.
170 * Waits until there is a free buffer in the pool, gets the first available
171 * buffer, fills it with the message.
172 * Messages are printed in a separate thread (see retrieve method)
174 // ============================================================================
176 int LocalTraceBufferPool::insert(int traceType, const char* msg)
179 // get immediately a message number to control sequence (mutex protected)
181 unsigned long myMessageNumber = lockedIncrement(_position);
183 // wait until there is a free buffer in the pool
188 ret = sem_wait(&_freeBufferSemaphore);
189 if (ret) perror(" LocalTraceBufferPool::insert, sem_wait");
192 // get the next free buffer available (mutex protected)
194 unsigned long myInsertPos = lockedIncrement(_insertPos);
196 // fill the buffer with message, thread id and type (normal or abort)
198 strncpy(_myBuffer[myInsertPos%TRACE_BUFFER_SIZE].trace,
200 MAXMESS_LENGTH); // last chars always "...\n\0" if msg too long
201 _myBuffer[myInsertPos%TRACE_BUFFER_SIZE].threadId =pthread_self();//thread id
202 _myBuffer[myInsertPos%TRACE_BUFFER_SIZE].traceType = traceType;
203 _myBuffer[myInsertPos%TRACE_BUFFER_SIZE].position = myMessageNumber;
206 // increment the full buffer semaphore
207 // (if previously 0, awake thread in charge of trace)
209 ret = sem_post(&_fullBufferSemaphore);
211 // returns the number of free buffers
213 sem_getvalue(&_freeBufferSemaphore, &ret);
217 // ============================================================================
219 * Called by the thread in charge of printing trace messages.
220 * Waits until there is a buffer with a message to print.
221 * Gets the first buffer to print, copies it int the provided buffer
223 // ============================================================================
225 int LocalTraceBufferPool::retrieve(LocalTrace_TraceInfo& aTrace)
228 // wait until there is a buffer in the pool, with a message to print
233 ret = sem_wait(&_fullBufferSemaphore);
234 if (ret) perror(" LocalTraceBufferPool::retrieve, sem_wait");
237 // get the next buffer to print
239 unsigned long myRetrievePos = lockedIncrement(_retrievePos);
241 // copy the buffer from the pool to the provided buffer
243 memcpy((void*)&aTrace,
244 (void*)&_myBuffer[myRetrievePos%TRACE_BUFFER_SIZE],
247 // increment the free buffer semaphore
248 // (if previously 0, awake one of the threads waiting to put a trace, if any)
249 // there is no way to preserve the order of waiting threads if several
250 // threads are waiting to put a trace: the waken up thread is not
251 // necessarily the first thread to wait.
253 ret = sem_post(&_freeBufferSemaphore);
255 // returns the number of full buffers
257 sem_getvalue(&_fullBufferSemaphore, &ret);
261 // ============================================================================
263 * Gives the number of buffers to print.
264 * Usage : when the thread in charge of messages print id to be stopped,
265 * check if there is still something to print, before stop.
266 * There is no need of mutex here, provided there is only one thread to
267 * retrieve and print the buffers.
269 // ============================================================================
271 unsigned long LocalTraceBufferPool::toCollect()
273 return _insertPos - _retrievePos;
276 // ============================================================================
278 * Constructor : initialize pool of buffers, semaphores and mutex.
280 // ============================================================================
282 LocalTraceBufferPool::LocalTraceBufferPool()
284 //cerr << "LocalTraceBufferPool::LocalTraceBufferPool()" << endl;
286 _insertPos = ULONG_MAX; // first increment will give 0
287 _retrievePos = ULONG_MAX;
288 _position=0; // first message will have number = 1
290 memset(_myBuffer, 0, sizeof(_myBuffer)); // to guarantee end of strings = 0
291 for (int i=0; i<TRACE_BUFFER_SIZE; i++)
292 strcpy(&(_myBuffer[i].trace[MAXMESS_LENGTH]),TRUNCATED_MESSAGE);
294 ret=sem_init(&_freeBufferSemaphore, 0, TRACE_BUFFER_SIZE); // all buffer free
295 if (ret!=0) IMMEDIATE_ABORT(ret);
296 ret=sem_init(&_fullBufferSemaphore, 0, 0); // 0 buffer full
297 if (ret!=0) IMMEDIATE_ABORT(ret);
298 ret=pthread_mutex_init(&_incrementMutex,NULL); // default = fast mutex
299 if (ret!=0) IMMEDIATE_ABORT(ret);
301 //cerr << "LocalTraceBufferPool::LocalTraceBufferPool()-end" << endl;
304 // ============================================================================
306 * Destructor : release memory associated with semaphores and mutex
308 // ============================================================================
310 LocalTraceBufferPool::~LocalTraceBufferPool()
312 int ret = pthread_mutex_lock(&_singletonMutex); // acquire lock to be alone
315 DEVTRACE("LocalTraceBufferPool::~LocalTraceBufferPool()");
316 delete (_myThreadTrace);
319 ret=sem_destroy(&_freeBufferSemaphore);
320 ret=sem_destroy(&_fullBufferSemaphore);
321 ret=pthread_mutex_destroy(&_incrementMutex);
322 DEVTRACE("LocalTraceBufferPool::~LocalTraceBufferPool()-end");
325 ret = pthread_mutex_unlock(&_singletonMutex); // release lock
328 // ============================================================================
330 * pool counters are incremented under a mutex protection
332 // ============================================================================
334 unsigned long LocalTraceBufferPool::lockedIncrement(unsigned long& pos)
337 ret = pthread_mutex_lock(&_incrementMutex); // lock access to counters
338 unsigned long mypos = ++pos;
339 ret = pthread_mutex_unlock(&_incrementMutex); // release lock