In Apple's implement for CFRunloop,in function __CFRunLoopRun they define a local var named pool:
Boolean poll = sourceHandledThisLoop || (0ULL == timeout_context->termTSR);
And then they used this value like this:
if (!poll && (rlm->_observerMask & kCFRunLoopBeforeWaiting))
__CFRunLoopDoObservers(rl, rlm, kCFRunLoopBeforeWaiting);
if (!poll && (rlm->_observerMask & kCFRunLoopAfterWaiting))
__CFRunLoopDoObservers(rl, rlm, kCFRunLoopAfterWaiting);
What does poll means in this context?Why poll is a special case in the runloop flow?
