par_join — Wait for subthreads that were started with the par_start
qualifier.
par_join( : : ThreadID : )
The par_join operator is used to wait in the calling procedure
for all procedures or operators that have been started in separate
subthreads by adding the par_start qualifier to the according
program line.
The subthreads to wait for are identified by their thread ids that are
passed to the parameter ThreadID.
Attention: par_start is not an operator but a qualifier that is
added at the begin of the program line that has to be executed in parallel
to the calling procedure. The syntax is
par_start <ThreadID> : followed by the actual procedure or
operator call.
ThreadID (input_control) thread_id(-array) → (integer)
Ids of all subthreads to wait for.
* start two procedures in separate sub threads par_start <ThreadID1> : producer_proc() par_start <ThreadID2> : consumer_proc() * wait until both procedures have finished par_join ([ThreadID1, ThreadID2])
If the values of the specified parameters are correct,
par_join returns 2 (H_MSG_TRUE). Otherwise, an
exception is raised and an error code returned.
Foundation