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Lets say I have allocated some memory in my background thread, that is, a thread stack is holding a pointer to that memory. Now I want do terminate background thread execution by calling pthread_cancel on it. Will that memory be released or not? (My platform is iOS, compiler is gcc 4.2)
Each thread by necessity requires its own stack; however there is typically only one heap per process. When a thread is destroyed, there is no automatic mechanism to free the memory allocated on the heap. All you end up with is a memory leak.
As a general rule, avoid using
pthread_cancelsince it is hard to ensure thatpthread_cancelwill run safely. Rather build in some mechanism where you can pass a message to the thread to destroy itself (after freeing any resources that it owns).