// ------------------------------- // // -------- 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 the basic operation of the vbThread class using semaphores. */ // ----------------------------------------------------------- // #include <iostream.h> #include <stdlib.h> #include "vbthread.h" #include "vbsema.h" // Constants const int NUM_THREADS = 3; // Global semaphore object vbSemaphore sema; // Shared data int sharedData1 = 0; int sharedData2 = 0; // Class derived from the abstract vbThread base class class SimpleThread : public vbThread { public: SimpleThread() { } ~SimpleThread() { } private: // Base class interface void *ThreadEntryRoutine(vbThread_t *thread); }; void *SimpleThread::ThreadEntryRoutine(vbThread_t *thread) { cout << "Entering thread" << endl; if(sema.SemaphoreWait() != 0) { cout << sema.SemaphoreExceptionMessage() << endl; return ExitThread(thread, 1); } // ********** Critical Section ******************* // cout << "Start critical section, holding semaphore" << endl; // Access to shared data goes here ++sharedData1; --sharedData2; cout << "sharedData1 = " << sharedData1 << ", sharedData2 = " << sharedData2 << endl; cout << "End critical section, release semaphore" << endl; // ********** Critical Section ******************* // if(sema.SemaphorePost() != 0) { cout << sema.SemaphoreExceptionMessage() << endl; return ExitThread(thread, 1); } return 0; } int main(int argc, char **argv) { SimpleThread t; vbThread_t *thread[NUM_THREADS]; int i; cout << "Wait on semaphore to prevent access to shared data" << endl; cout << "sharedData1 = " << sharedData1 << ", sharedData2 = " << sharedData2 << endl; if(sema.SemaphoreWait() != 0) { cout << sema.SemaphoreExceptionMessage() << endl; return 0; } cout << "Creating " << NUM_THREADS << " threads" << endl; for(i = 0; i < NUM_THREADS; ++i) thread[i] = t.CreateThread(); cout << "Wait a bit until we are done with the shared data" << endl; t.sSleep(3); cout << "Unlock shared data" << endl; if(sema.SemaphorePost() != 0) { cout << sema.SemaphoreExceptionMessage() << endl; return 0; } cout << "Wait for the threads to complete, and release their resources" << endl; for(i = 0; i < NUM_THREADS; ++i) t.JoinThread(thread[i]); return 0; } // ----------------------------------------------------------- // // ------------------------------- // // --------- End of File --------- // // ------------------------------- //