llvm-project

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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include <CoreFoundation/CoreFoundation.h>
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#include <dispatch/dispatch.h>
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#include <unistd.h>
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//#import <Foundation/Foundation.h>
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#include <Block.h>
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// CONFIG rdar://problem/6371811
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const char *whoami = "nobody";
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void EnqueueStuff(dispatch_queue_t q)
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{
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    __block CFIndex counter;
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    // above call has a side effect: it works around:
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    // <rdar://problem/6225809> __block variables not implicitly imported into intermediate scopes
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    dispatch_async(q, ^{
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        counter = 0;
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    });
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    dispatch_async(q, ^{
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        //printf("outer block.\n");
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        counter++;
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        dispatch_async(q, ^{
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            //printf("inner block.\n");
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            counter--;
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            if(counter == 0) {
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                printf("%s: success\n", whoami);
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                exit(0);
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            }
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        });
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        if(counter == 0) {
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            printf("already done? inconceivable!\n");
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            exit(1);
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        }
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    });        
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}
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int main (int argc, const char * argv[]) {
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    dispatch_queue_t q = dispatch_queue_create("queue", NULL);
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    whoami = argv[0];
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    EnqueueStuff(q);
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    dispatch_main();
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    printf("shouldn't get here\n");
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    return 1;
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}
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