test/BlocksRuntime/dispatch_async.c

   1 //
   2 //                     The LLVM Compiler Infrastructure
   3 //
   4 // This file is distributed under the University of Illinois Open Source
   5 // License. See LICENSE.TXT for details.
   6
   7 #include <CoreFoundation/CoreFoundation.h>
   8
   9 #include <dispatch/dispatch.h>
  10 #include <unistd.h>
  11 //#import <Foundation/Foundation.h>
  12 #include <Block.h>
  13
  14 // CONFIG rdar://problem/6371811
  15
  16 const char *whoami = "nobody";
  17
  18 void EnqueueStuff(dispatch_queue_t q)
  19 {
  20     __block CFIndex counter;
  21
  22     // above call has a side effect: it works around:
  23     // <rdar://problem/6225809> __block variables not implicitly imported into intermediate scopes
  24     dispatch_async(q, ^{
  25         counter = 0;
  26     });
  27
  28
  29     dispatch_async(q, ^{
  30         //printf("outer block.\n");
  31         counter++;
  32         dispatch_async(q, ^{
  33             //printf("inner block.\n");
  34             counter--;
  35             if(counter == 0) {
  36                 printf("%s: success\n", whoami);
  37                 exit(0);
  38             }
  39         });
  40         if(counter == 0) {
  41             printf("already done? inconceivable!\n");
  42             exit(1);
  43         }
  44     });
  45 }
  46
  47 int main (int argc, const char * argv[]) {
  48     dispatch_queue_t q = dispatch_queue_create("queue", NULL);
  49
  50     whoami = argv[0];
  51
  52     EnqueueStuff(q);
  53
  54     dispatch_main();
  55     printf("shouldn't get here\n");
  56     return 1;
  57 }