ParallelTaskExecuteAfter (Function)

ONLINE HELP
WINDEV, WEBDEV AND WINDEV MOBILE

Version:

Home | Sign in | English

This content has been translated automatically. Click here to view the French version.

WINDEV

WEBDEV

WINDEV Mobile

Others

See also

ParallelTaskExecuteAfter (Function)

In french: TâcheParallèleExécuteAprès

Indicates a continuation parallel task that will be run when the specified parallel task is ended.

Versions 21 and later

This function is now available in Apple Watch mode.

This function is now available in Universal Windows 10 App mode.

New in version 21

This function is now available in Apple Watch mode.

This function is now available in Universal Windows 10 App mode.

This function is now available in Apple Watch mode.

This function is now available in Universal Windows 10 App mode.

Versions 23 and later

This function is now available in Android widget mode.

This function is now available for Android applications.

New in version 23

This function is now available in Android widget mode.

This function is now available for Android applications.

This function is now available in Android widget mode.

This function is now available for Android applications.

Example

// Lance une tâche
t1 is ParallelTask = ParallelTaskExecute(Proc1)
// Lorsque la tâche sera terminée, la procédure ProcContinuation sera exécutée
ParallelTaskExecuteAfter(t1, ProcContinuation)

Syntax

Indicating a procedure that will be run after a previous task Hide the details

<Result> = ParallelTaskExecuteAfter(<Previous task> , <Continuation procedure> [, <Parameters> [, <Options>]])

<Result>: ParallelTask variable

ParallelTask variable corresponding to the continuation task.

<Previous task>: ParallelTask variable

Name of ParallelTask variable corresponding to the previous task.

<Continuation procedure>: Character string or Procedure variable

Procedure to run after the specified previous task. This parameter can correspond to:
the name of the WLanguage procedure to run.
to the name of the variable Procedure corresponding to the continuation procedure to be executed.

<Parameters>: List of values enclosed in brackets and separated by commas

Parameters of procedure to run. This list of parameters has the following format:

(<Paramètre 1>, ..., <Paramètre N>)

where:
<Parameter 1>: First procedure parameter.
...
<Parameter N>: Nth procedure parameter.
Remark: The ReturnedValuePreviousTask keyword is used to pass the return values of the previous task as parameter of continuation procedure.

<Options>: Optional Integer constant (or combination of constants)

Options of task to run:
ptoFullCopyHFSQLContext Triggers the immediate copy of the current HFSQL context.
Recommended, for example, if the parallel task must take into account the current positions in the files and queries of the context of the caller.
ptoDelayedCopyHFSQLContext
(Default value) Triggers a light copy of HFSQL context during the first access to the HFSQL data.
ptoLightCopyHFSQLContext Triggers the immediate copy of a part of the current HFSQL context.
Only the directories containing the data files in HFSQL Classic mode and/or the connections in HFSQL Client/Server mode are stored.
ptoMainThread Runs the task in the main thread.
This constant can be combined with one of the other constants.

Indicating a described task that will be run after a previous task Hide the details

<Result> = ParallelTaskExecuteAfter(<Previous task> , <Continuation task>)

<Result>: ParallelTask variable

ParallelTask variable corresponding to the continuation task.

<Previous task>: ParallelTask variable

Name of ParallelTask variable corresponding to the previous task.

<Continuation task>: ParallelTask variable

Name of ParallelTask variable corresponding to the task that will be run after.

Describing a task that will be run after a previous task Hide the details

<Result> = ParallelTaskExecuteAfter(<Previous task> , <Description of continuation task>)

<Result>: ParallelTask variable

ParallelTask variable corresponding to the continuation task.

<Previous task>: ParallelTask variable

Name of ParallelTask variable corresponding to the previous task.

<Description of continuation task>: Description of ParallelTask variable

Name of Description of ParallelTask variable describing the task that will be run after.

Remarks

ParallelTaskExecuteAfter is a non-blocking function.
If the function is called while the task is already ended, the continuation will be run as soon as possible.
If the function is called while the task is already canceled, the continuation will not be run.
If the previous task is canceled while a continuation was created, the continuation will not be run.
In the code of the continuation task, the MyPreviousParallelTask keyword is used to handle the previous ended task.

Related Examples:

Unit examples (WINDEV): Using parallel tasks

[ + ] The parallel tasks are used to speed up the process times and to improve the reactivity of an application.
This example presents the functions and types of variables required to use the parallel tasks:
- running parallel tasks,
- interaction with the controls,
- continuation tasks.

Business / UI classification: Neutral code

Component: wd270vm.dll