问题
In unix, If a multi-threaded process was sent a signal, which thread will be the one to execute the handling function?
if it is a multi-cpu machine, more than 1 thread is running at the same time. which thread will be the on to run the signal handling function?
回答1:
According to man 7 signal, all threads in the process share the same signal handler, and if a signal is delivered to a process with multiple threads that have not blocked the signal, one of them is arbitrarily chosen to receive it.
Having a multi-CPU machine will not change these semantics.
来源：https://stackoverflow.com/questions/5502011/multi-threaded-signal-handling