1// RUN: %clangxx_tsan %s -o %t -framework Foundation
2// RUN: %deflake %run %t 2>&1 | FileCheck %s
3
4// UNSUPPORTED: ios
5
6#import <Foundation/Foundation.h>
7#import <xpc/xpc.h>
8#import <stdatomic.h>
9
10#import "../test.h"
11
12long global;
13
14_Atomic(long) msg_counter;
15_Atomic(long) processed_msgs;
16xpc_connection_t server_conn;
17xpc_connection_t client_conns[2];
18
19int main(int argc, const char *argv[]) {
20 @autoreleasepool {
21 fprintf(stderr, format: "Hello world.\n");
22 // CHECK: Hello world.
23
24 barrier_init(barrier: &barrier, count: 2);
25
26 dispatch_queue_t server_q = dispatch_queue_create("server.queue", DISPATCH_QUEUE_CONCURRENT);
27
28 server_conn = xpc_connection_create(NULL, server_q);
29
30 xpc_connection_set_event_handler(server_conn, ^(xpc_object_t client) {
31 fprintf(stderr, "server event handler, client = %p\n", client);
32
33 if (client == XPC_ERROR_CONNECTION_INTERRUPTED || client == XPC_ERROR_CONNECTION_INVALID) {
34 return;
35 }
36 xpc_connection_set_event_handler(client, ^(xpc_object_t object) {
37 fprintf(stderr, "received message: %p\n", object);
38
39 long msg_number = atomic_fetch_add_explicit(&msg_counter, 1, memory_order_relaxed);
40
41 if (msg_number == 0)
42 barrier_wait(barrier: &barrier);
43
44 global++;
45 // CHECK: WARNING: ThreadSanitizer: data race
46 // CHECK: Write of size 8
47 // CHECK: #0 {{.*}}xpc-race.mm:[[@LINE-3]]
48 // CHECK: Previous write of size 8
49 // CHECK: #0 {{.*}}xpc-race.mm:[[@LINE-5]]
50 // CHECK: Location is global 'global'
51
52 if (msg_number == 1)
53 barrier_wait(barrier: &barrier);
54
55 atomic_fetch_add(&processed_msgs, 1);
56
57 dispatch_sync(dispatch_get_main_queue(), ^{
58 if (processed_msgs >= 2) {
59 xpc_connection_cancel(client_conns[0]);
60 xpc_connection_cancel(client_conns[1]);
61 xpc_connection_cancel(server_conn);
62 CFRunLoopStop(CFRunLoopGetCurrent());
63 }
64 });
65 });
66
67 xpc_connection_resume(client);
68 });
69 xpc_connection_resume(server_conn);
70 xpc_endpoint_t endpoint = xpc_endpoint_create(server_conn);
71
72 for (int i = 0; i < 2; i++) {
73 client_conns[i] = xpc_connection_create_from_endpoint(endpoint);
74 xpc_connection_set_event_handler(client_conns[i], ^(xpc_object_t event) {
75 fprintf(stderr, "client event handler, event = %p\n", event);
76 });
77
78 xpc_object_t msg = xpc_dictionary_create(NULL, NULL, 0);
79 xpc_dictionary_set_string(msg, "hello", "world");
80 fprintf(stderr, "sending message: %p\n", msg);
81
82 xpc_connection_send_message(client_conns[i], msg);
83 xpc_connection_resume(client_conns[i]);
84 }
85
86 CFRunLoopRun();
87
88 fprintf(stderr, format: "Done.\n");
89 // CHECK: Done.
90 }
91 return 0;
92}
93

source code of compiler-rt/test/tsan/Darwin/xpc-race.mm