PTLib
Version 2.10.4
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This class defines a thread synchronisation object. More...
#include <syncthrd.h>
Public Member Functions | |
virtual void | Signal () |
If there are waiting (blocked) threads then unblock the first one that was blocked. | |
void | Signal (const PTimeInterval &waitTime) |
void | Acknowledge () |
This indicates that the thread that was blocked in a Wait() on this synchronisation object has completed the operation the signal was intended to initiate. | |
Protected Attributes | |
PSyncPoint | ack |
This class defines a thread synchronisation object.
This may be used to send signals to a thread and await an acknowldegement that the signal was processed. This can be be used to initiate an action in another thread and wait for the action to be completed.
... thread one
while (condition) {
sync.Wait();
do_something();
sync.Acknowledge();
}
... thread 2
do_something_else();
sync.Signal(); // At this point thread 1 wake up and does something.
do_yet_more(); // However, this does not get done until Acknowledge()
is called in the other thread.
void PSyncPointAck::Acknowledge | ( | ) |
virtual void PSyncPointAck::Signal | ( | ) | [virtual] |
If there are waiting (blocked) threads then unblock the first one that was blocked.
If no waiting threads and the count is less than the maximum then increment the semaphore.
Unlike the PSyncPoint::Signal() this function will block until the target thread that was blocked by the Wait() function has resumed execution and called the Acknowledge() function.
The waitTime
parameter is used as a maximum amount of time to wait for the achnowledgement to be returned from the other thread.
Reimplemented from PSemaphore.
void PSyncPointAck::Signal | ( | const PTimeInterval & | waitTime | ) |
PSyncPoint PSyncPointAck::ack [protected] |