11.2.1 Thread Cancellation

Thread cancellation through a call to pthread_cancel(3T) results in the destruction of automatic (local nonstatic) objects on the stack except when you specify -noex or -features=no%except.

pthread_cancel(3T)uses the same mechanism as exceptions. When a thread is cancelled, the execution of local destructors is interleaved with the execution of cleanup routines that the user has registered with pthread_cleanup_push(). The local objects for functions called after a particular cleanup routine is registered are destroyed before that routine is executed.