the winning total should be read from the keyboard before the game starts and be

Question

the winning total should be read from the keyboard before the game starts and before any fork(for example 50 or 500).

Your program should ignore CTR-C and CTR-Z signals

The referee should be the one to check the scores and to declare the winner. A com- mon file should be used between processes for communicating their current score to the referee.

Explanation / Answer

#include #include #include #include #include #include #include // defaults #define PROB_TREE 0.55 #define PROB_F 0.00001 #define PROB_P 0.001 #define TIMERFREQ 100 #ifndef WIDTH # define WIDTH 640 #endif #ifndef HEIGHT # define HEIGHT 480 #endif #ifndef BPP # define BPP 32 #endif #if BPP != 32 #warning This program could not work with BPP different from 32 #endif uint8_t *field[2], swapu; double prob_f = PROB_F, prob_p = PROB_P, prob_tree = PROB_TREE; enum cell_state { VOID, TREE, BURNING }; // simplistic random func to give [0, 1) double prand() { return (double)rand() / (RAND_MAX + 1.0); } // initialize the field void init_field(void) { int i, j; swapu = 0; for(i = 0; i pixels; uint32_t color; SDL_PixelFormat *f = s->format; pthread_mutex_lock(&synclock); for(i = 0; i >3)) = color; } } pthread_mutex_unlock(&synclock); } int main(int argc, char **argv) { SDL_Surface *scr = NULL; SDL_Event event[1]; bool quit = false, running = false; SDL_TimerID tid; // add variability to the simulation srand(time(NULL)); // we can change prob_f and prob_p // prob_f prob of spontaneous ignition // prob_p prob of birth of a tree double *p; for(argv++, argc--; argc > 0; argc--, argv++) { if ( strcmp(*argv, "prob_f") == 0 && argc > 1 ) { p = &prob_f; } else if ( strcmp(*argv, "prob_p") == 0 && argc > 1 ) { p = &prob_p; } else if ( strcmp(*argv, "prob_tree") == 0 && argc > 1 ) { p = &prob_tree; } else continue; argv++; argc--; char *s = NULL; double t = strtod(*argv, &s); if (s != *argv) *p = t; } printf("prob_f %lf prob_p %lf ratio %lf prob_tree %lf ", prob_f, prob_p, prob_p/prob_f, prob_tree); if ( SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER) != 0 ) return EXIT_FAILURE; atexit(SDL_Quit); field[0] = malloc(WIDTH*HEIGHT); if (field[0] == NULL) exit(EXIT_FAILURE); field[1] = malloc(WIDTH*HEIGHT); if (field[1] == NULL) { free(field[0]); exit(EXIT_FAILURE); } scr = SDL_SetVideoMode(WIDTH, HEIGHT, BPP, SDL_HWSURFACE|SDL_DOUBLEBUF); if (scr == NULL) { fprintf(stderr, "SDL_SetVideoMode: %s ", SDL_GetError()); free(field[0]); free(field[1]); exit(EXIT_FAILURE); } init_field(); tid = SDL_AddTimer(TIMERFREQ, simulate, NULL); // suppose success running = true; event->type = SDL_VIDEOEXPOSE; SDL_PushEvent(event); while(SDL_WaitEvent(event) && !quit) { switch(event->type) { case SDL_VIDEOEXPOSE: while(SDL_LockSurface(scr) != 0) SDL_Delay(1); show(scr); SDL_UnlockSurface(scr); SDL_Flip(scr); event->type = SDL_VIDEOEXPOSE; SDL_PushEvent(event); break; case SDL_KEYDOWN: switch(event->key.keysym.sym) { case SDLK_q: quit = true; break; case SDLK_p: if (running) { running = false; pthread_mutex_lock(&synclock); SDL_RemoveTimer(tid); // ignore failure... pthread_mutex_unlock(&synclock); } else { running = true; tid = SDL_AddTimer(TIMERFREQ, simulate, NULL); // suppose success... } break; } case SDL_QUIT: quit = true; break; } } if (running) { pthread_mutex_lock(&synclock); SDL_RemoveTimer(tid); pthread_mutex_unlock(&synclock); } free(field[0]); free(field[1]); exit(EXIT_SUCCESS); }

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