multi-thread and signal

Here are the summary between signal and threads.


In a multi-threaded application, there is always the question of which thread the signal will actually be delivered to. Or does it get delivered to all the threads?

To answer the last question first, no. If one signal is generated, one signal is delivered, so any single signal will only be delivered to a single thread.

So which thread will get the signal? If it is a synchronous signal, the signal is delivered to the thread that generated it. Synchronous signals are commonly managed by having an appropriate signal handler set up in each thread to handle any that aren't masked. If it is an asynchronous signal, it could go to any of the threads that haven't masked out that signal using sigprocmask().

By the way, the signal is asynchronous signal in our case.

http://www.linuxjournal.com/article/2121