signal_condition — Signal a condition synchronization object.
signal_condition( : : ConditionHandle : )
signal_condition restarts one of the threads that are waiting on the
ConditionHandle. If no threads are waiting on
ConditionHandle, nothing happens. If several threads are waiting on
ConditionHandle, exactly one is restarted, but it is not specified
Condition synchronization object.
If the condition handle is valid, the operator
returns 2 (H_MSG_TRUE).
If necessary, an exception is raised.