[pull] master from XMuli:master #15
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函数: //发射信号给指定进程、或者同组的信号。 - int kill(pid_t pid, int sig); //自己给自己发射信号。在单线程程序中，它相当于 kill(getpid(), sig)； //在一个多线程程序中，它等同于 pthread_kill(pthread_self(), sig)。 - int raise(int sig); //给自己发送异常终止的信号。该函数没有参数和返回值，也永远不会调用失败。 - void abort(void); //设置定时器（每一个进程只有一个定时器） - unsigned int alarm(unsigned int seconds); //定时器，并且实现 周期性 定时。 - int setitimer(int which, const struct itimerval *new_value, struct itimerval *old_value);
- 自定义信号集： - sigaddset() //将指定信号置为 1，添加到自定义集中 - sigdelset() //将指定信号置为 0，添加到自定义集中 - sigemptyset() //将所有信号置为 0，清空 - sigfillset() //将所有信号置为 1，填充 - sigismember() //判断指定信号是否存在，是否为 1 - 系统信号集： - sigprocmask() //将自定义信号集设置给阻塞信号集。 - sigprocmask() //读取当前信号的未决信号集。参数为输出参数，内核将未决信号集写入 set - 信号捕捉： - signal() //实现信号捕捉的功能；最简单使用一个函数。 - sigaction() //同上，多一个额外功能，运行期间能够**临时** 屏蔽指定信号
使用读写锁的一个标准大概流程（所有线程都要加锁）： - pthread_rwlock_init() - pthread_rwlock_rdlock() / pthread_rwlock_tryrdlock() / pthread_rwlock_wrlock() / pthread_rwlock_trywrlock() - 、、、代码 片 - pthread_rwlock_unlock() - pthread_rwlock_destroy()
pthread_cond_t g_cond; //条件变量--阻塞线程，等待条件满足 pthread_cond_wait() //阻塞线程，且该函数会对互斥锁解锁；且接解除阻塞之后，对互斥锁进行加锁操作 pthread_cond_signal() //通知阻塞的消费者线程，解除阻塞
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