《操作系统》的实验代码。
 
 
 
 
 

28 lines
530 B

#include <stdio.h>
#include <ulib.h>
void
sleepy(int pid) {
int i, time = 100;
for (i = 0; i < 10; i ++) {
sleep(time);
cprintf("sleep %d x %d slices.\n", i + 1, time);
}
exit(0);
}
int
main(void) {
unsigned int time = gettime_msec();
int pid1, exit_code;
if ((pid1 = fork()) == 0) {
sleepy(pid1);
}
assert(waitpid(pid1, &exit_code) == 0 && exit_code == 0);
cprintf("use %04d msecs.\n", gettime_msec() - time);
cprintf("sleep pass.\n");
return 0;
}