帮你理解多线程

2023-11-30 09:23:52

static BOOL flag=NO;


dispatch_queue_t myQueue=dispatch_queue_create("identifier", NULL);

dispatch_async(myQueue, ^{

for (int i=0; i<10; i++) {
NSLog(@"%d",i);
}
flag=YES;
});





NSLog(@"before");

while (!flag){
NSLog(@"after");

}
NSLog(@"after2");

return;