compiler-rt/test/BlocksRuntime/dispatch_async.c

   1 //
   2 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   3 // See https://llvm.org/LICENSE.txt for license information.
   4 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   5
   6 #include <CoreFoundation/CoreFoundation.h>
   7
   8 #include <dispatch/dispatch.h>
   9 #include <unistd.h>
  10 //#import <Foundation/Foundation.h>
  11 #include <Block.h>
  12
  13 // CONFIG rdar://problem/6371811
  14
  15 const char *whoami = "nobody";
  16
  17 void EnqueueStuff(dispatch_queue_t q)
  18 {
  19     __block CFIndex counter;
  20
  21     // above call has a side effect: it works around:
  22     // <rdar://problem/6225809> __block variables not implicitly imported into intermediate scopes
  23     dispatch_async(q, ^{
  24         counter = 0;
  25     });
  26
  27
  28     dispatch_async(q, ^{
  29         //printf("outer block.\n");
  30         counter++;
  31         dispatch_async(q, ^{
  32             //printf("inner block.\n");
  33             counter--;
  34             if(counter == 0) {
  35                 printf("%s: success\n", whoami);
  36                 exit(0);
  37             }
  38         });
  39         if(counter == 0) {
  40             printf("already done? inconceivable!\n");
  41             exit(1);
  42         }
  43     });
  44 }
  45
  46 int main (int argc, const char * argv[]) {
  47     dispatch_queue_t q = dispatch_queue_create("queue", NULL);
  48
  49     whoami = argv[0];
  50
  51     EnqueueStuff(q);
  52
  53     dispatch_main();
  54     printf("shouldn't get here\n");
  55     return 1;
  56 }