Linux C 工程中有很多线程之间的数据需要共享时，怎么保证数据的同步？

互斥锁（mutex）
int pthread_mutex_init(pthread_mutex_t *mutex,const pthread_mutex_attr_t *mutexattr);
int pthread_mutex_lock(pthread_mutex *mutex);
int pthread_mutex_destroy(pthread_mutex *mutex);
int pthread_mutex_unlock(pthread_mutex *)

条件变量（cond）
int pthread_cond_init(pthread_cond_t *cond,pthread_condattr_t *cond_attr);
int pthread_cond_wait(pthread_cond_t *cond,pthread_mutex_t *mutex);
int pthread_cond_timewait(pthread_cond_t *cond,pthread_mutex *mutex,const timespec *abstime);
int pthread_cond_destroy(pthread_cond_t *cond);
int pthread_cond_signal(pthread_cond_t *cond);
int pthread_cond_broadcast(pthread_cond_t *cond);

信号量
int sem_init (sem_t *sem , int pshared, unsigned int value);
int sem_wait(sem_t *sem);
int sem_post(sem_t *sem);
int sem_destroy(sem_t *sem);