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| * 获取 runloop 方法 * * @param t 线程参数 * * @return 返回获得的 runloop */ CF_EXPORT CFRunLoopRef _CFRunLoopGet0(pthread_t t) {
if (pthread_equal(t, kNilPthreadT)) { t = pthread_main_thread_np(); }
__CFSpinLock(&loopsLock);
if (!__CFRunLoops) {
__CFSpinUnlock(&loopsLock);
CFMutableDictionaryRef dict = CFDictionaryCreateMutable(kCFAllocatorSystemDefault, 0, NULL, &kCFTypeDictionaryValueCallBacks);
CFRunLoopRef mainLoop = __CFRunLoopCreate(pthread_main_thread_np());
CFDictionarySetValue(dict, pthreadPointer(pthread_main_thread_np()), mainLoop);
if (!OSAtomicCompareAndSwapPtrBarrier(NULL, dict, (void * volatile *)&__CFRunLoops)) {
CFRelease(dict); }
CFRelease(mainLoop);
__CFSpinLock(&loopsLock); }
CFRunLoopRef loop = (CFRunLoopRef)CFDictionaryGetValue(__CFRunLoops, pthreadPointer(t));
__CFSpinUnlock(&loopsLock);
if (!loop) {
CFRunLoopRef newLoop = __CFRunLoopCreate(t);
__CFSpinLock(&loopsLock);
loop = (CFRunLoopRef)CFDictionaryGetValue(__CFRunLoops, pthreadPointer(t));
if (!loop) {
CFDictionarySetValue(__CFRunLoops, pthreadPointer(t), newLoop); loop = newLoop; }
__CFSpinUnlock(&loopsLock);
CFRelease(newLoop); }
if (pthread_equal(t, pthread_self())) {
_CFSetTSD(__CFTSDKeyRunLoop, (void *)loop, NULL); if (0 == _CFGetTSD(__CFTSDKeyRunLoopCntr)) { _CFSetTSD(__CFTSDKeyRunLoopCntr, (void *)(PTHREAD_DESTRUCTOR_ITERATIONS-1), (void (*)(void *))__CFFinalizeRunLoop); } } return loop; }
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