#include #include #include #include #include #include void *thread_worker1(void *args); void *thread_worker2(void *args); typedef struct worker_ctx_s { int shared_var; pthread_mutex_t lock; } worker_ctx_t; int main(int argc, char **argv) { worker_ctx_t worker_ctx; pthread_t tid; pthread_attr_t thread_attr; worker_ctx.shared_var = 1000; pthread_mutex_init(&worker_ctx.lock, NULL); if( pthread_attr_init(&thread_attr) ) { printf("pthread_attr_init() failure: %s\n", strerror(errno)); return -1; } if( pthread_attr_setstacksize(&thread_attr, 120*1024) ) { printf("pthread_attr_setstacksize() failure: %s\n", strerror(errno)); return -1; } if( pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_DETACHED) ) { printf("pthread_attr_setdetachstate() failure: %s\n", strerror(errno)); return -1; } pthread_create(&tid, &thread_attr, thread_worker1, &worker_ctx); printf("Thread worker1 tid[%ld] created ok\n", tid); pthread_create(&tid, &thread_attr, thread_worker2, &worker_ctx); printf("Thread worker2 tid[%ld] created ok\n", tid); while(1) { printf("Main/Control thread shared_var: %d\n", worker_ctx.shared_var); sleep(10); } pthread_mutex_destroy(&worker_ctx.lock); } void *thread_worker1(void *args) { worker_ctx_t *ctx = (worker_ctx_t *)args; if( !args ) { printf("%s() get invalid arguments\n", __FUNCTION__); pthread_exit(NULL); } printf("Thread workder 1 [%ld] start running...\n", pthread_self()); while(1) { pthread_mutex_lock(&ctx->lock); printf("+++: %s before shared_var++: %d\n", __FUNCTION__, ctx->shared_var); ctx->shared_var ++; sleep(2); printf("+++: %s after sleep shared_var: %d\n", __FUNCTION__, ctx->shared_var); pthread_mutex_unlock(&ctx->lock); sleep(1); } printf("Thread workder 1 exit...\n"); return NULL; } void *thread_worker2(void *args) { worker_ctx_t *ctx = (worker_ctx_t *)args; if( !args ) { printf("%s() get invalid arguments\n", __FUNCTION__); pthread_exit(NULL); } printf("Thread workder 2 [%ld] start running...\n", pthread_self()); while(1) { if(0 != pthread_mutex_trylock(&ctx->lock) ) { continue; } printf("---: %s before shared_var++: %d\n", __FUNCTION__, ctx->shared_var); ctx->shared_var ++; sleep(2); printf("---: %s after sleep shared_var: %d\n", __FUNCTION__, ctx->shared_var); pthread_mutex_unlock(&ctx->lock); sleep(1); } printf("Thread workder 2 exit...\n"); return NULL; }