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C语言多线程小球碰撞源代码

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    标    签:C语言多线程

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    C语言多线程示例代码

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    // sample_multithread_c_program.c // compile with: /c // // Bounce - Creates a new thread each time the letter 'a' is typed. // Each thread bounces a happy face of a different color around // the screen. All threads are terminated when the letter 'Q' is // entered. // #include #include #include #include #include #include #define MAX_THREADS 32 // The function getrandom returns a random number between // min and max, which must be in integer range. #define getrandom( min, max ) (SHORT)((rand() % (int)(((max) + 1) - \ (min))) + (min)) int main( void ); // Thread 1: main void KbdFunc( void ); // Keyboard input, thread dispatch void BounceProc( void * MyID ); // Threads 2 to n: display void ClearScreen( void ); // Screen clear void ShutDown( void ); // Program shutdown void WriteTitle( int ThreadNum ); // Display title bar information HANDLE hConsoleOut; // Handle to the console HANDLE hRunMutex; // "Keep Running" mutex HANDLE hScreenMutex; // "Screen update" mutex int ThreadNr; // Number of threads started CONSOLE_SCREEN_BUFFER_INFO csbiInfo; // Console information int main() // Thread One { // Get display screen information & clear the screen. hConsoleOut = GetStdHandle( STD_OUTPUT_HANDLE ); GetConsoleScreenBufferInfo( hConsoleOut, &csbiInfo ); ClearScreen(); WriteTitle( 0 ); // Create the mutexes and reset thread count. hScreenMutex = CreateMutex( NULL, FALSE, NULL ); // Cleared hRunMutex = CreateMutex( NULL, TRUE, NULL ); // Set ThreadNr = 0; // Start waiting for keyboard input to dispatch threads or exit. KbdFunc(); // All threads done. Clean up handles. CloseHandle( hScreenMutex ); CloseHandle( hRunMutex ); CloseHandle( hConsoleOut ); } void ShutDown( void ) // Shut down threads { while ( ThreadNr > 0 ) { // Tell thread to die and record its death. ReleaseMutex( hRunMutex ); ThreadNr--; } // Clean up display when done WaitForSingleObject( hScreenMutex, INFINITE ); ClearScreen(); } void KbdFunc( void ) // Dispatch and count threads. { int KeyInfo; do { KeyInfo = _getch(); if ( tolower( KeyInfo ) == 'a' && ThreadNr < MAX_THREADS ) { ThreadNr++; _beginthread( BounceProc, 0, &ThreadNr ); WriteTitle( ThreadNr ); } } while( tolower( KeyInfo ) != 'q' ); ShutDown(); } void BounceProc( void *pMyID ) { char MyCell, OldCell; WORD MyAttrib, OldAttrib; char BlankCell = 0x20; COORD Coords, Delta; COORD Old = {0,0}; DWORD Dummy; char *MyID = (char*)pMyID; // Generate update increments and initial // display coordinates. srand( (unsigned int) *MyID * 3 ); Coords.X = getrandom( 0, csbiInfo.dwSize.X - 1 ); Coords.Y = getrandom( 0, csbiInfo.dwSize.Y - 1 ); Delta.X = getrandom( -3, 3 ); Delta.Y = getrandom( -3, 3 ); // Set up "happy face" & generate color // attribute from thread number. if( *MyID > 16) MyCell = 0x01; // outline face else MyCell = 0x02; // solid face MyAttrib = *MyID & 0x0F; // force black background do { // Wait for display to be available, then lock it. WaitForSingleObject( hScreenMutex, INFINITE ); // If we still occupy the old screen position, blank it out. ReadConsoleOutputCharacter( hConsoleOut, &OldCell, 1, Old, &Dummy ); ReadConsoleOutputAttribute( hConsoleOut, &OldAttrib, 1, Old, &Dummy ); if (( OldCell == MyCell ) && (OldAttrib == MyAttrib)) WriteConsoleOutputCharacter( hConsoleOut, &BlankCell, 1, Old, &Dummy ); // Draw new face, then clear screen lock WriteConsoleOutputCharacter( hConsoleOut, &MyCell, 1, Coords, &Dummy ); WriteConsoleOutputAttribute( hConsoleOut, &MyAttrib, 1, Coords, &Dummy ); ReleaseMutex( hScreenMutex ); // Increment the coordinates for next placement of the block. Old.X = Coords.X; Old.Y = Coords.Y; Coords.X += Delta.X; Coords.Y += Delta.Y; // If we are about to go off the screen, reverse direction if( Coords.X < 0 || Coords.X >= csbiInfo.dwSize.X ) { Delta.X = -Delta.X; Beep( 400, 50 ); } if( Coords.Y < 0 || Coords.Y > csbiInfo.dwSize.Y ) { Delta.Y = -Delta.Y; Beep( 600, 50 ); } } // Repeat while RunMutex is still taken. while ( WaitForSingleObject( hRunMutex, 75L ) == WAIT_TIMEOUT ); } void WriteTitle( int ThreadNum ) { enum { sizeOfNThreadMsg = 80 }; char NThreadMsg[sizeOfNThreadMsg]; sprintf_s( NThreadMsg, sizeOfNThreadMsg, "Threads running: %02d. Press 'A' " "to start a thread,'Q' to quit.", ThreadNum ); SetConsoleTitle( NThreadMsg ); } void ClearScreen( void ) { DWORD dummy; COORD Home = { 0, 0 }; FillConsoleOutputCharacter( hConsoleOut, ' ', csbiInfo.dwSize.X * csbiInfo.dwSize.Y, Home, &dummy ); }

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