EventWait (Function)

ONLINE HELP
WINDEV, WEBDEV AND WINDEV MOBILE

Version:

Home | Sign in | English

Help

WLanguage

WLanguage functions

Standard functions

Process management functions

Threads, semaphores, signals and mutex

WLanguage functions

EventWait

Presentation

Example

See also

EventWait (Function)

In french: SignalAttend

Locks the current thread while waiting for the specified event to be opened.

Example

// Create an event
EventCreate("Let's go", eventAutomatic, eventClose)
// Run a first thread
ThreadExecute("Thread1", threadNormal, "Thread_First")
// Locks the current thread until the event is obtained
ThreadWaitSignal()

// Run a second thread
ThreadExecute("Thread2", threadNormal, "Thread_Second")
// Locks the current thread until the event is obtained
ThreadWaitSignal()

// Modifies the event to run the threads
EventChange("Let's go", eventOpen)

PROCEDURE Thread_First()
Trace(dbgInfo(dbgProcess) + " - ThreadSendSignal(threadMain)")
ThreadSendSignal(threadMain)
EventWait("Let's go")
Trace(dbgInfo(dbgProcess) + " - Event received")

PROCEDURE Thread_Second()
Trace(dbgInfo(dbgProcess) + " - ThreadSendSignal(threadMain)")
ThreadSendSignal(threadMain)
EventWait("Let's go")
Trace(dbgInfo(dbgProcess) + " - Event received")

Syntax

<Result> = EventWait(<Event> [, <Maximum duration>])

<Result>: Integer

1 if the event was received by the thread,
0 otherwise (maximum duration exceeded).

<Event>: Character string, or AutomaticEvent or ManualEvent variable

Name of the event to wait for. If this event does not exist, it is automatically created with the default options (automatic mode) and closed.
Name of the AutomaticEvent variable that corresponds to the event to wait for.
Name of the ManualEvent variable that corresponds to the event to wait for.

<Maximum duration>: Optional integer or optional Duration

Maximum timeout in hundredths of a second.
If no signal was received by the thread before the end of specified duration, <Result> is equal to False.
The timeout is endless if this parameter is not specified.
If this parameter is set to 0, <Result> corresponds to the status of the event, without waiting.
This parameter can correspond to:
an integer corresponding to the number of hundredths of a second,
a Duration variable,
the duration in a readable format (e.g., 1 s or 10 ms).

Remarks

You can end the execution of a thread even if it is locked in an endless wait for an event. Simply use ThreadStop.

Component: wd280vm.dll