Function ProcWaitForSignal

src/backend/storage/lmgr/proc.c:2182–2189

* ProcWaitForSignal - wait for a signal from another backend. * * As this uses the generic process latch the caller has to be robust against * unrelated wakeups: Always check that the desired state has occurred, and * wait again if not. */

 * wait again if not.
 */
void
ProcWaitForSignal(uint32 wait_event_info)
{
	(void) WaitLatch(MyLatch, WL_LATCH_SET | WL_EXIT_ON_PM_DEATH, 0,
					 wait_event_info);
	ResetLatch(MyLatch);
	CHECK_FOR_INTERRUPTS();
}

/*
 * ProcSendSignal - send a signal to a backend identified by PID