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Совет: |
Пример: #include "SDL_thread.h"
int global_data = 0;
int thread_func(void *unused) { int last_value = 0;
while ( global_data != -1 ) { if ( global_data != last_value ) { printf("Data value changed to %d\n", global_data); last_value = global_data; } SDL_Delay(100); } printf("Thread quitting\n"); return(0); }
{ SDL_Thread *thread; int i;
thread = SDL_CreateThread(thread_func, NULL); if ( thread == NULL ) { fprintf(stderr, "Unable to create thread: %s\n", SDL_GetError()); return; }
for ( i=0; i<5; ++i ) { printf("Changing value to %d\n", i); global_data = i; SDL_Delay(1000); }
printf("Signaling thread to quit\n"); global_data = -1; SDL_WaitThread(thread, NULL); } |
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Совет: |
Пример: #include "SDL_thread.h" #include "SDL_mutex.h"
int potty = 0; int gotta_go;
int thread_func(void *data) { SDL_mutex *lock = (SDL_mutex *)data; int times_went;
times_went = 0; while ( gotta_go ) { SDL_mutexP(lock); /* Lock the potty */ ++potty; printf("Thread %d using the potty\n", SDL_ThreadID()); if ( potty > 1 ) { printf("Uh oh, somebody else is using the potty!\n"); } --potty; SDL_mutexV(lock); ++times_went; } printf("Yep\n"); return(times_went); }
{ const int progeny = 5; SDL_Thread *kids[progeny]; SDL_mutex *lock; int i, lots;
/* Create the synchronization lock */ lock = SDL_CreateMutex();
gotta_go = 1; for ( i=0; i<progeny; ++i ) { kids[i] = SDL_CreateThread(thread_func, lock); }
SDL_Delay(5*1000); SDL_mutexP(lock); printf("Everybody done?\n"); gotta_go = 0; SDL_mutexV(lock);
for ( i=0; i<progeny; ++i ) { SDL_WaitThread(kids[i], &lots); printf("Thread %d used the potty %d times\n", i+1, lots); } SDL_DestroyMutex(lock); } |
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