WaitableEvent Class Reference

Allows threads to wait for events triggered by other threads. More...

#include <juce_WaitableEvent.h>

Collaboration diagram for WaitableEvent:

Public Member Functions
	WaitableEvent (bool manualReset=false) noexcept
	Creates a WaitableEvent object. More...
	~WaitableEvent () noexcept
	Destructor. More...
void	reset () const noexcept
	Resets the event to an unsignalled state. More...
void	signal () const noexcept
	Wakes up any threads that are currently waiting on this object. More...
bool	wait (int timeOutMilliseconds=-1) const noexcept
	Suspends the calling thread until the event has been signalled. More...

Private Attributes
void *	handle

Detailed Description

Allows threads to wait for events triggered by other threads.

A thread can call wait() on a WaitableObject, and this will suspend the calling thread until another thread wakes it up by calling the signal() method.

Constructor & Destructor Documentation

WaitableEvent()

WaitableEvent::WaitableEvent ( bool  manualReset = false )

explicitnoexcept

Creates a WaitableEvent object.

The object is initially in an unsignalled state.

Parameters

manualReset

If this is false, the event will be reset automatically when the wait() method is called. If manualReset is true, then once the event is signalled, the only way to reset it will be by calling the reset() method.

~WaitableEvent()

WaitableEvent::~WaitableEvent ( )

noexcept

Destructor.

If other threads are waiting on this object when it gets deleted, this can cause nasty errors, so be careful!

Member Function Documentation

reset()

void WaitableEvent::reset ( ) const

noexcept

Resets the event to an unsignalled state.

If it's not already signalled, this does nothing.

signal()

void WaitableEvent::signal ( ) const

noexcept

Wakes up any threads that are currently waiting on this object.

If signal() is called when nothing is waiting, the next thread to call wait() will return immediately and reset the signal.

If the WaitableEvent is manual reset, all current and future threads that wait upon this object will be woken, until reset() is explicitly called.

If the WaitableEvent is automatic reset, and one or more threads is waiting upon the object, then one of them will be woken up. If no threads are currently waiting, then the next thread to call wait() will be woken up. As soon as a thread is woken, the signal is automatically reset.

See also

wait, reset

wait()

bool WaitableEvent::wait ( int  timeOutMilliseconds = -1 ) const

noexcept

Suspends the calling thread until the event has been signalled.

This will wait until the object's signal() method is called by another thread, or until the timeout expires.

After the event has been signalled, this method will return true and if manualReset was set to false in the WaitableEvent's constructor, then the event will be reset.

Parameters

timeOutMilliseconds

the maximum time to wait, in milliseconds. A negative value will cause it to wait forever.

Returns

true if the object has been signalled, false if the timeout expires first.

See also

signal, reset

Member Data Documentation

handle

void* WaitableEvent::handle

private

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The documentation for this class was generated from the following files:

• juce_WaitableEvent.h
• juce_posix_SharedCode.h