static int32_t __CFRunLoopRun(CFRunLoopRef rl, CFRunLoopModeRef rlm, CFTimeInterval seconds, Boolean stopAfterHandle, CFRunLoopModeRef previousMode) { int64_t startTSR = (int64_t)mach_absolute_time(); if (__CFRunLoopIsStopped(rl)) { __CFRunLoopUnsetStopped(rl); return kCFRunLoopRunStopped; } else if (rlm->_stopped) { rlm->_stopped = false; return kCFRunLoopRunStopped; } mach_port_name_t dispatchPort = MACH_PORT_NULL; Boolean libdispatchQSafe = pthread_main_np() && ((HANDLE_DISPATCH_ON_BASE_INVOCATION_ONLY && NULL == previousMode) || (!HANDLE_DISPATCH_ON_BASE_INVOCATION_ONLY && 0 == _CFGetTSD(__CFTSDKeyIsInGCDMainQ))); if (libdispatchQSafe && (CFRunLoopGetMain() == rl) && CFSetContainsValue(rl->_commonModes, rlm->_name)) dispatchPort = _dispatch_get_main_queue_port_4CF(); dispatch_source_t timeout_timer = NULL; struct __timeout_context *timeout_context = (struct __timeout_context *)malloc(sizeof(*timeout_context)); if (seconds <= 0.0) { // instant timeout seconds = 0.0; timeout_context->termTSR = 0LL; } else if (seconds <= TIMER_INTERVAL_LIMIT) { dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, DISPATCH_QUEUE_OVERCOMMIT); timeout_timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue); dispatch_retain(timeout_timer); timeout_context->ds = timeout_timer; timeout_context->rl = (CFRunLoopRef)CFRetain(rl); timeout_context->termTSR = startTSR + __CFTimeIntervalToTSR(seconds); dispatch_set_context(timeout_timer, timeout_context); // source gets ownership of context dispatch_source_set_event_handler_f(timeout_timer, __CFRunLoopTimeout); dispatch_source_set_cancel_handler_f(timeout_timer, __CFRunLoopTimeoutCancel); uint64_t nanos = (uint64_t)(seconds * 1000 * 1000 + 1) * 1000; dispatch_source_set_timer(timeout_timer, dispatch_time(DISPATCH_TIME_NOW, nanos), DISPATCH_TIME_FOREVER, 0); dispatch_resume(timeout_timer); } else { // infinite timeout seconds = 9999999999.0; timeout_context->termTSR = INT64_MAX; } Boolean didDispatchPortLastTime = true; int32_t retVal = 0; do { uint8_t msg_buffer[3 * 1024]; #if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED mach_msg_header_t *msg = NULL; #elif DEPLOYMENT_TARGET_WINDOWS HANDLE livePort = NULL; Boolean windowsMessageReceived = false; #endif __CFPortSet waitSet = rlm->_portSet; rl->_ignoreWakeUps = false; if (rlm->_observerMask & kCFRunLoopBeforeTimers) __CFRunLoopDoObservers(rl, rlm, kCFRunLoopBeforeTimers); if (rlm->_observerMask & kCFRunLoopBeforeSources) __CFRunLoopDoObservers(rl, rlm, kCFRunLoopBeforeSources); __CFRunLoopDoBlocks(rl, rlm); Boolean sourceHandledThisLoop = __CFRunLoopDoSources0(rl, rlm, stopAfterHandle); if (sourceHandledThisLoop) { __CFRunLoopDoBlocks(rl, rlm); } Boolean poll = sourceHandledThisLoop || (0LL == timeout_context->termTSR); if (MACH_PORT_NULL != dispatchPort && ! didDispatchPortLastTime) { #if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED msg = (mach_msg_header_t *)msg_buffer; if (__CFRunLoopServiceMachPort(dispatchPort, &msg, sizeof(msg_buffer), 0)) { goto handle_msg; } #elif DEPLOYMENT_TARGET_WINDOWS if (__CFRunLoopWaitForMultipleObjects(NULL, &dispatchPort, 0, 0, &livePort, NULL)) { goto handle_msg; } #endif } didDispatchPortLastTime = false; if (!poll && (rlm->_observerMask & kCFRunLoopBeforeWaiting)) __CFRunLoopDoObservers(rl, rlm, kCFRunLoopBeforeWaiting); __CFRunLoopSetSleeping(rl); // do not do any user callouts after this point (after notifying of sleeping) // Must push the local-to-this-activation ports in on every loop // iteration, as this mode could be run re- entrantly and we don't // want these ports to get serviced. __CFPortSetInsert(dispatchPort, waitSet); __CFRunLoopModeUnlock(rlm); __CFRunLoopUnlock(rl); #if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED if (kCFUseCollectableAllocator) { objc_clear_stack(0); memset(msg_buffer, 0, sizeof(msg_buffer)); } msg = (mach_msg_header_t *)msg_buffer; __CFRunLoopServiceMachPort(waitSet, &msg, sizeof(msg_buffer), poll ? 0 : TIMEOUT_INFINITY); #elif DEPLOYMENT_TARGET_WINDOWS // Here, use the app-supplied message queue mask. They will set this if they are interested in having this run loop receive windows messages. // Note: don't pass 0 for polling, or this thread will never yield the CPU. __CFRunLoopWaitForMultipleObjects(waitSet, NULL, poll ? 0 : TIMEOUT_INFINITY, rlm->_msgQMask, &livePort, &windowsMessageReceived); #endif __CFRunLoopLock(rl); __CFRunLoopModeLock(rlm); // Must remove the local-to-this-activation ports in on every loop // iteration, as this mode could be run re- entrantly and we don't // want these ports to get serviced. Also, we don't want them left // in there if this function returns. __CFPortSetRemove(dispatchPort, waitSet); rl->_ignoreWakeUps = true; // user callouts now OK again __CFRunLoopUnsetSleeping(rl); if (!poll && (rlm->_observerMask & kCFRunLoopAfterWaiting)) __CFRunLoopDoObservers(rl, rlm, kCFRunLoopAfterWaiting); handle_msg:; rl->_ignoreWakeUps = true; #if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED mach_port_t livePort = msg ? msg->msgh_local_port : MACH_PORT_NULL; #endif #if DEPLOYMENT_TARGET_WINDOWS if (windowsMessageReceived) { // These Win32 APIs cause a callout, so make sure we're unlocked first and relocked after __CFRunLoopModeUnlock(rlm); __CFRunLoopUnlock(rl); if (rlm->_msgPump) { rlm->_msgPump(); } else { MSG msg; if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE | PM_NOYIELD)) { TranslateMessage(&msg); DispatchMessage(&msg); } } __CFRunLoopLock(rl); __CFRunLoopModeLock(rlm); sourceHandledThisLoop = true; } else #endif if (MACH_PORT_NULL == livePort) { // handle nothing } else if (livePort == rl->_wakeUpPort) { // do nothing on Mac OS #if DEPLOYMENT_TARGET_WINDOWS // Always reset the wake up port, or risk spinning forever ResetEvent(rl->_wakeUpPort); #endif } else if (livePort == rlm->_timerPort) { #if DEPLOYMENT_TARGET_WINDOWS // We use a manual reset timer to ensure that we don't miss timers firing because the run loop did the wakeUpPort this time // The only way to reset a timer is to reset the timer using SetWaitableTimer. We don't want it to fire again though, so we set the timeout to a large negative value. The timer may be reset again inside the timer handling code. LARGE_INTEGER dueTime; dueTime.QuadPart = LONG_MIN; SetWaitableTimer(rlm->_timerPort, &dueTime, 0, NULL, NULL, FALSE); #endif __CFRunLoopDoTimers(rl, rlm, mach_absolute_time()); } else if (livePort == dispatchPort) { __CFRunLoopModeUnlock(rlm); __CFRunLoopUnlock(rl); _CFSetTSD(__CFTSDKeyIsInGCDMainQ, (void *)6, NULL); #if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED _dispatch_main_queue_callback_4CF(msg); #elif DEPLOYMENT_TARGET_WINDOWS _dispatch_main_queue_callback_4CF(); #endif _CFSetTSD(__CFTSDKeyIsInGCDMainQ, (void *)0, NULL); __CFRunLoopLock(rl); __CFRunLoopModeLock(rlm); sourceHandledThisLoop = true; didDispatchPortLastTime = true; } else { // Despite the name, this works for windows handles as well CFRunLoopSourceRef rls = __CFRunLoopModeFindSourceForMachPort(rl, rlm, livePort); if (rls) { #if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED mach_msg_header_t *reply = NULL; sourceHandledThisLoop = __CFRunLoopDoSource1(rl, rlm, rls, msg, msg->msgh_size, &reply) || sourceHandledThisLoop; if (NULL != reply) { (void)mach_msg(reply, MACH_SEND_MSG, reply->msgh_size, 0, MACH_PORT_NULL, 0, MACH_PORT_NULL); CFAllocatorDeallocate(kCFAllocatorSystemDefault, reply); } #elif DEPLOYMENT_TARGET_WINDOWS sourceHandledThisLoop = __CFRunLoopDoSource1(rl, rlm, rls) || sourceHandledThisLoop; #endif } } #if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED if (msg && msg != (mach_msg_header_t *)msg_buffer) free(msg); #endif __CFRunLoopDoBlocks(rl, rlm); if (sourceHandledThisLoop && stopAfterHandle) { retVal = kCFRunLoopRunHandledSource; } else if (timeout_context->termTSR < (int64_t)mach_absolute_time()) { retVal = kCFRunLoopRunTimedOut; } else if (__CFRunLoopIsStopped(rl)) { __CFRunLoopUnsetStopped(rl); retVal = kCFRunLoopRunStopped; } else if (rlm->_stopped) { rlm->_stopped = false; retVal = kCFRunLoopRunStopped; } else if (__CFRunLoopModeIsEmpty(rl, rlm, previousMode)) { retVal = kCFRunLoopRunFinished; } } while (0 == retVal); if (timeout_timer) { dispatch_source_cancel(timeout_timer); dispatch_release(timeout_timer); } else { free(timeout_context); } return retVal; }
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