Книга: Programming with POSIX® Threads

6.6.2 Signal masks

6.6.2 Signal masks

int pthread_sigmask (int how, const sigset_t *set, sigset_t *oset);

Each thread has its own private signal mask, which is modified by calling pthread_sigmask. Pthreads does not specify what sigprocmask does within a threaded process — it may do nothing. Portable threaded code does not call sigprocmask. A thread can block or unblock signals without affecting the ability of other threads to handle the signal. This is particularly important for synchronous signals. It would be awkward if thread A were unable to process a SIGFPE because thread B was currently processing its own SIGFPE or. even worse, because thread C had blocked SIGFPE. When a thread is created, it inherits the signal mask of the thread that created it — if you want a signal to be masked everywhere, mask it first thing in main.

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