// ------------------------------- // // -------- Start of File -------- // // ------------------------------- // // ----------------------------------------------------------- // // C++ Source Code File Name: testprog.cpp // Compiler Used: MSVC, BCC32, GCC, HPUX aCC, SOLARIS CC // Produced By: Doug Gaer // File Creation Date: 03/25/2000 // Date Last Modified: 08/10/2000 // Copyright (c) 2000 Douglas M. Gaer // ----------------------------------------------------------- // // ------------- Program Description and Details ------------- // // ----------------------------------------------------------- // /* This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Test program demonstrating how to change thread priorities. */ // ----------------------------------------------------------- // #include <iostream.h> #include <stdlib.h> #include "vbthread.h" #include "vbcond.h" // For safe condition variable usage, must use a boolean predicate and // a mutex with the condition. int conditionMet = 0; vbCondition cond; vbMutex mutex; void PrintThreadStatus(vbThread_t *thread) { cout << "Thread OID: " << (int)thread->GetObjectID() << ", " << thread->ThreadPriorityMessage() << ", " << thread->ThreadPriorityClassMessage() << '\n'; } void HandleThreadError(vbThread_t *thread) { cout << "Error setting thread " << thread->GetObjectID() << " priority" << endl; cout << thread->ThreadExceptionMessage() << endl; cout << "Setting priority back to normal" << endl; thread->SetThreadPriority(vbTHREAD_PRIORITY_NORMAL); thread->SetThreadPriorityClass(vbTHREAD_PRIORITY_CLASS_OTHER); } class SimpleThread : public vbThread { private: // Base class interface void *ThreadEntryRoutine(vbThread_t *thread); }; void *SimpleThread::ThreadEntryRoutine(vbThread_t *thread) { mutex.MutexLock(); // Block the thread initially while (!conditionMet) cond.ConditionWait(&mutex); PrintThreadStatus(thread); mutex.MutexUnlock(); return 0; } // Main thread of execution int main() { SimpleThread t; const int NUM_THREADS = 10; vbThread_t *thread[NUM_THREADS]; int i, rv; // Create the threads in a blocked state for(i = 0; i < NUM_THREADS; i++) { thread[i] = t.CreateThread(); thread[i]->SetObjectID(i); // Assign an arbitary object ID // Check for any errors created during thread creataion if(thread[i]->GetThreadError() != vbTHREAD_NO_ERROR) cout << thread[i]->ThreadExceptionMessage() << endl; } // Change some of the thread priorities and policies before executing them rv = t.SetThreadPriority(thread[NUM_THREADS-1], vbTHREAD_PRIORITY_HIGH); if(rv != 0) HandleThreadError(thread[NUM_THREADS-1]); rv = t.SetThreadPriority(thread[NUM_THREADS-2], vbTHREAD_PRIORITY_HIGH, vbTHREAD_PRIORITY_CLASS_FIFO); if(rv != 0) HandleThreadError(thread[NUM_THREADS-2]); rv = t.SetThreadPriority(thread[NUM_THREADS-3], vbTHREAD_PRIORITY_HIGH, vbTHREAD_PRIORITY_CLASS_RR); if(rv != 0) HandleThreadError(thread[NUM_THREADS-3]); rv = t.SetThreadPriority(thread[0], vbTHREAD_PRIORITY_LOW); if(rv != 0) HandleThreadError(thread[0]); rv = t.SetThreadPriority(thread[1], vbTHREAD_PRIORITY_LOW, vbTHREAD_PRIORITY_CLASS_FIFO); if(rv != 0) HandleThreadError(thread[1]); rv = t.SetThreadPriority(thread[2], vbTHREAD_PRIORITY_LOW, vbTHREAD_PRIORITY_CLASS_RR); if(rv != 0) HandleThreadError(thread[2]); mutex.MutexLock(); // Set the flag and wake up all the waiters conditionMet = 1; cond.ConditionBroadcast(); mutex.MutexUnlock(); // Wait for all the threads to finish before exiting for(i = 0; i < NUM_THREADS; i++) t.JoinThread(thread[i]); // Cleanup all the vbThread_t pointers for(i = 0; i < NUM_THREADS; i++) { rv = t.DestroyThread(thread[i]); if(rv != 0) { cout << "Error destroying thread!" << endl; } } return 0; // Exit the process } // ----------------------------------------------------------- // // ------------------------------- // // --------- End of File --------- // // ------------------------------- //