par_joinpar_joinParJoinParJoin (Operator)

Name

par_joinpar_joinParJoinParJoin — Wait for subthreads that were started with the par_start qualifier.

The par_joinpar_joinParJoinParJoinParJoin 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 ThreadIDThreadIDThreadIDThreadIDthreadID.

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.

Parameters

ThreadIDThreadIDThreadIDThreadIDthreadID (input_control) thread_id(-array) → (integer)

Ids of all subthreads to wait for.

Example (HDevelop)

* 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])

Result

If the values of the specified parameters are correct, par_joinpar_joinParJoinParJoinParJoin returns 2 (H_MSG_TRUE). Otherwise an exception is raised and an error code returned.

Module

Foundation