多线程信号处理
在unix中，如果向多线程进程发送信号，哪个线程将执行处理函数？
如果是多CPU机器，则同时运行的线程数超过1个。哪个线程将运行信号处理函数？
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?
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根据man 7 signal，进程中的所有线程共享同一个信号处理程序，并且如果信号被传递到具有多个未阻塞该信号的线程的进程，任意选择其中一个线程来接收该信号。
拥有多 CPU 机器不会改变这些语义。
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.