testing/dispatch_after.c

   1 #include <dispatch/dispatch.h>
   2 #include <stdio.h>
   3 #include <unistd.h>
   4 #include <stdlib.h>
   5 #include <assert.h>
   6 #include <libkern/OSAtomic.h>
   7
   8 #include "dispatch_test.h"
   9 #include <Block.h>
  10
  11 void done(void *arg __unused) {
  12     sleep(1);
  13     test_stop();
  14 }
  15
  16 int
  17 main(void)
  18 {
  19     __block dispatch_time_t time_a_min, time_a, time_a_max;
  20     __block dispatch_time_t time_b_min, time_b, time_b_max;
  21     __block dispatch_time_t time_c_min, time_c, time_c_max;
  22
  23
  24         test_start("Dispatch After");
  25
  26     dispatch_async(dispatch_get_main_queue(), ^{
  27             time_a_min = dispatch_time(0,  5.5*NSEC_PER_SEC);
  28             time_a     = dispatch_time(0,   6*NSEC_PER_SEC);
  29             time_a_max = dispatch_time(0,  6.5*NSEC_PER_SEC);
  30             dispatch_after(time_a, dispatch_get_current_queue(), ^{
  31                     dispatch_time_t now_a = dispatch_time(0, 0);
  32                     test_long_less_than("can't finish faster than 5.5s", 0, now_a - time_a_min);
  33                     test_long_less_than("must finish faster than  6.5s", 0, time_a_max - now_a);
  34
  35                     time_b_min = dispatch_time(0,  1.5*NSEC_PER_SEC);
  36                     time_b     = dispatch_time(0,    2*NSEC_PER_SEC);
  37                     time_b_max = dispatch_time(0,  2.5*NSEC_PER_SEC);
  38                     dispatch_after(time_b, dispatch_get_current_queue(), ^{
  39                             dispatch_time_t now_b = dispatch_time(0, 0);
  40                             test_long_less_than("can't finish faster than 1.5s", 0, now_b - time_b_min);
  41                             test_long_less_than("must finish faster than  2.5s", 0, time_b_max - now_b);
  42
  43                             time_c_min = dispatch_time(0,  0*NSEC_PER_SEC);
  44                             time_c     = dispatch_time(0,  0*NSEC_PER_SEC);
  45                             time_c_max = dispatch_time(0,  .5*NSEC_PER_SEC);
  46                             dispatch_after(time_c, dispatch_get_current_queue(), ^{
  47                                     dispatch_time_t now_c = dispatch_time(0, 0);
  48                                     test_long_less_than("can't finish faster than 0s", 0, now_c - time_c_min);
  49                                     test_long_less_than("must finish faster than .5s", 0, time_c_max - now_c);
  50
  51                                     dispatch_async_f(dispatch_get_current_queue(), NULL, done);
  52                                 });
  53                         });
  54                 });
  55         });
  56
  57     dispatch_main();
  58     return 0;
  59 }