Manual Pages  — THR_SUSPEND

The thr_suspend() system call puts the calling thread in a suspended state, where it is not eligible for CPU time. This state is exited by another thread calling thr_wake(2), when the time interval specified by timeout has elapsed, or by the delivery of a signal to the suspended thread.

If the timeout argument is NULL, the suspended state can be only terminated by explicit thr_wake() or signal.

If a wake from thr_wake(2) was delivered before the thr_suspend call, the thread is not put into a suspended state. Instead, the call returns immediately without an error.

If a thread previously called thr_wake(2) with its own thread identifier, which resulted in setting the internal kernel flag to immediately abort interruptible sleeps with an EINTR error ( see thr_wake(2) ), the flag is cleared. As with thr_wake(2) called from another thread, the next thr_suspend call does not result in suspension.