pthread_cond_signal_int_np - Wakes one thread that is waiting on the specified condition variable (called from interrupt level only).
DECthreads POSIX 1003.1c Library (libpthread.so)
Condition variable to be signaled.
This routine wakes one thread waiting on the specified condition variable. It can only be called from a software interrupt handler routine (that is, from a Tru64 UNIX signal handler or OpenVMS AST). Calling this routine implies that it might be possible for a single waiting thread to proceed.
The scheduling policies of the waiting threads determine which thread is awakened. For policies SCHED_FIFO and SCHED_RR, a blocked thread is chosen in priority order, using first-in/first-out (FIFO) within priorities.
This routine does not cause a thread blocked on a condition variable to resume execution immediately. A thread resumes execution at some time after the interrupt handler routine returns.
You can call this routine regardless of whether the associated mutex is locked (by some other thread). Never lock a mutex from an interrupt handler routine.
This routine allows you to signal a thread from a software interrupt handler. Do not call this routine from noninterrupt code. To signal a thread from the normal noninterrupt level, use pthread_cond_signal(3).
If an error condition occurs, this routine returns an integer value indicating the type of error. Possible return values are as follows: Successful completion. The value specified by cond is invalid.
Functions: pthread_cond_broadcast(3), pthread_cond_signal(3), pthread_cond_timedwait(3), pthread_cond_wait(3)
Manuals: Guide to DECthreads and Programmer's Guide