pthread_t data type) • signal mask ( pthread_sigmask (3)) • the errno variable • alternate signal stack ... pthread_setcanceltype (3), pthread_setspecific (3), pthread_sigmask (3),…manipulate its signal mask using pthread_sigmask (3). In a traditional single-threaded application, sigprocmaskthese calls. • The sigprocmask (2) and pthread_sigmask (3) interfaces silently ignore attempts to blockself (3) Added in POSIX.1-2008 TC1 pthread_sigmask (3) Added in POSIX.1-2008 TC1 raise