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POwhen is it safe to release an NSThread?
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  1. POwhen is it safe to release an NSThread?
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    copied!<p>Below is the runloop for my secondary NSThread* processThread</p> <p>To close the thread I call</p> <pre><code>//cancel secondary thread [processThread cancel] //signal condition [processCondition broadcast]; </code></pre> <p><strong>Is it then safe to then call:</strong></p> <pre><code>[processCondition release]; [processThread release]; </code></pre> <p><strong>or do i need to be sure that the thread has finished?</strong> <br> <br> Perhaps like this?</p> <pre><code>NSTimeInterval timeout = [NSDate timeIntervalSinceReferenceDate] + (1.0/15.0); while ([processThread isExecuting] &amp;&amp; [NSDate timeIntervalSinceReferenceDate] &lt; timeout) { [NSThread sleepForTimeInterval: 1.0/1000.0 ]; } [processCondition release]; [processThread release]; </code></pre> <p><br> <br> <br> <i>detailed code and explanation:</p> <pre><code>- (void)processLoop { NSAutoreleasePool * outerPool = [[NSAutoreleasePool alloc] init]; [processCondition lock]; //outer loop //this loop runs until my application exits while (![[NSThread currentThread] isCancelled]) { NSAutoreleasePool *middlePool = [[NSAutoreleasePool alloc]; if(processGo) { //inner loop //this loop runs typically for a few seconds while (processGo &amp;&amp; ![[NSThread currentThread] isCancelled]) { NSAutoreleasePool *innerPool = [[NSAutoreleasePool alloc]; init]; //within inner loop //this takes a fraction of a second [self doSomething]; [innerPool release]; } [self tidyThingsUp]; } else { [processCondition wait]; } [middlePool release]; } [processCondition unlock]; [outerPool release]; } </code></pre> <p>the combination of:</p> <ul> <li>an inner while loop</li> <li>NSCondition *processCondition</li> <li>toggling <code>processGo</code> between <code>YES</code> and <code>NO</code></li> </ul> <p>allows me to stop and start the inner while loop without cancelling the thread. </p> <pre><code>if (processGo == YES) </code></pre> <p><br> execution enters the inner while loop.<br></p> <p>When the main thread sets</p> <pre><code>processGo = NO </code></pre> <p>execution leaves the inner while loop and tidys up <br> on the next pass of the outer loop, execution hits</p> <pre><code>[processCondition wait] </code></pre> <p>and waits</p> <p>if the the main thread resets</p> <pre><code>processGo == YES </code></pre> <p>and calls</p> <pre><code>[processCondition wait] </code></pre> <p>execution re-enters the inner loop </i></p>
 

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