Linux多執行緒中使用訊號-1
阿新 • • 發佈：2019-02-05
- pthread_sigmask - examine and change mask of blocked signals
- #include <signal.h>
- int pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset);
- Compile and link with -pthread.
- DESCRIPTION
- The pthread_sigmask() function is just like sigprocmask(2), with the difference that its use
- in multithreaded programsis explicitly specified by POSIX.1-2001.
- Other differences are noted in this page.
- For a description of the arguments and operation of this function, see sigprocmask(2).
- RETURN VALUE
- On success, pthread_sigmask() returns 0; on error, it returns an error number.
- NOTES
- A new thread inherits a copy of its creator's signal mask.
- (from man sigprocmask: )
- The behavior of the call is dependent on the value of how, as follows.
- SIG_BLOCK
- The set of blocked signals is the union of the current set and the set argument.
- SIG_UNBLOCK
- The signals in set are removed from the current set of blocked signals. It is permissible
- to attempt to unblocka signal which is not blocked.
- SIG_SETMASK
- The set of blocked signals is set to the argument set.
- If oldset is non-NULL, the previous value of the signal mask is stored in oldset.
- If set is NULL, then the signal mask is unchanged (i.e., how is ignored), but the current
- value of the signal mask is nevertheless returned in oldset (if it is not NULL).