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TaskWait[task]

waits for the specified task to be completely finished.

Details and Options
Details and Options Details and Options
Examples  
Basic Examples  
Options  
TimeConstraint  
See Also
Related Guides
History
Cite this Page

TaskWait

TaskWait[task]

waits for the specified task to be completely finished.

Details and Options

  • task can be either a TaskObject or task identifier string for a specific task.
  • TaskWait[task] blocks until task is completely finished, then returns the TaskObject[…] representing task.
  • For a scheduled task, TaskWait[task] waits until all instances of the task specified in the schedule have been executed.
  • The following option can be given:
  • TimeConstraint Infinitymaximum time to wait before returning
  • TaskWait has attribute Listable.

Examples

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Basic Examples  (4)

Start a task in the current session and wait until it finishes:

Wolfram Language code: TaskWait[ SessionSubmit[Integrate[x ^ 2 Log[x] ^ 5 / Sqrt[1 - x ^ 2], {x, 0, 1}], HandlerFunctions -> <|"TaskFinished" -> MessageDialog|>, HandlerFunctionsKeys -> {"EvaluationExpression", "EvaluationResult"}] ]

Wait for a task specified by its UUID:

Wolfram Language code: obj = LocalSubmit[Pause[20]];uuid = obj["TaskUUID"]
Wolfram Language code: TaskWait[uuid]

Start a task in a separate local kernel and wait until it finishes:

Wolfram Language code: TaskWait[LocalSubmit[Integrate[x ^ 2 Log[x] ^ 5 / Sqrt[1 - x ^ 2], {x, 0, 1}], HandlerFunctions -> <|"TaskFinished" -> MessageDialog|>, HandlerFunctionsKeys -> {"EvaluationExpression", "EvaluationResult"}]]

Starting an asynchronous task and waiting until it completes is equivalent to running the task synchronously:

Wolfram Language code: TaskWait[URLSubmit["http://www.wolfram.com", HandlerFunctions -> <|"TaskFinished" -> MessageDialog|>]]

Options  (1)

TimeConstraint  (1)

Wait for an asynchronous task to complete and then continue, even if it is not done:

Wolfram Language code: done = False; Print["Starting download at ", DateString[]]; task = URLSubmit["http://exampledata.wolfram.com/20mb.dat", HandlerFunctions -> <| "BodyReceived" -> ((done = True;MessageDialog["Download complete."])&), "BodyChunkReceived" -> (None&)|>]; TaskWait[task, TimeConstraint -> 1.5]
Wolfram Research (2017), TaskWait, Wolfram Language function, https://reference.wolfram.com/language/ref/TaskWait.html.

Text

Wolfram Research (2017), TaskWait, Wolfram Language function, https://reference.wolfram.com/language/ref/TaskWait.html.

CMS

Wolfram Language. 2017. "TaskWait." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/TaskWait.html.

APA

Wolfram Language. (2017). TaskWait. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/TaskWait.html

BibTeX

@misc{reference.wolfram_2026_taskwait, author="Wolfram Research", title="{TaskWait}", year="2017", howpublished="\url{https://reference.wolfram.com/language/ref/TaskWait.html}", note=[Accessed: 15-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_taskwait, organization={Wolfram Research}, title={TaskWait}, year={2017}, url={https://reference.wolfram.com/language/ref/TaskWait.html}, note=[Accessed: 15-June-2026]}