1 char g_watch_me_read;
2 char g_watch_me_write;
3 char g_temp;
4 
watch_read()5 void watch_read() {
6     g_temp = g_watch_me_read;
7 }
8 
watch_write()9 void watch_write() {
10     g_watch_me_write = g_temp;
11 }
12 
main()13 int main() {
14     watch_read();
15     g_temp = g_watch_me_read;
16     watch_write();
17     g_watch_me_write = g_temp;
18     return 0;
19 }
20