|alarm||Causes a signal to be sent to the calling process after a specified timeout.|
|kill or killpg||Sends a signal to a process or a group of processes.|
|pthread_atfork||Registers fork cleanup handlers.|
|pthread_kill||Sends a signal to the specified thread.|
|raise||Sends a signal to the executing program.|
|sigaction, sigvec, or signal||Specifies the action to take upon delivery of a signal.|
|sigsuspend or sigpause||Atomically changes the set of blocked signals and waits for a signal.|
|sigthreadmask||Sets the signal mask of a thread.|
|sigwait||Blocks the calling thread until a specified signal is received.|
Threads-Processes Interactions Overview.
Threads Library Quick Reference.