| 1 | #import <dispatch/dispatch.h> |
|---|---|
| 2 | #include <stdio.h> |
| 3 | |
| 4 | void one() { |
| 5 | printf(format: "one...\n"); // breakpoint 1 |
| 6 | } |
| 7 | |
| 8 | void two() { |
| 9 | printf(format: "two...\n"); |
| 10 | one(); |
| 11 | } |
| 12 | |
| 13 | void three() { |
| 14 | printf(format: "three...\n"); |
| 15 | two(); |
| 16 | } |
| 17 | |
| 18 | int main(int argc, char *argv[]) { |
| 19 | printf(format: "main...\n"); |
| 20 | // Nest from main queue > global queue > main queue. |
| 21 | dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), |
| 22 | ^{ |
| 23 | dispatch_async(dispatch_get_main_queue(), ^{ |
| 24 | three(); |
| 25 | }); |
| 26 | }); |
| 27 | dispatch_main(); |
| 28 | } |
| 29 |