llvm-project/compiler-rt/test/BlocksRuntime/rdar6405500.c

//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

// CONFIG rdar://6405500

#include <stdio.h>
#include <stdlib.h>
#import <dispatch/dispatch.h>
#import <objc/objc-auto.h>

int main (int argc, const char * argv[]) {
    __block void (^blockFu)(size_t t);
    blockFu = ^(size_t t){
        if (t == 20) {
            printf("%s: success\n", argv[0]);
            exit(0);
        } else
            dispatch_async(dispatch_get_main_queue(), ^{ blockFu(20); });
    };
    
    dispatch_apply(10, dispatch_get_concurrent_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT), blockFu);

    dispatch_main();
    printf("shouldn't get here\n");
    return 1;
}