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55 lines
1.5 KiB
55 lines
1.5 KiB
4 months ago
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// RUN: %clang_tsan %s -o %t
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// RUN: %deflake %run %t 2>&1 | FileCheck %s
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#include <dispatch/dispatch.h>
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#import "../test.h"
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dispatch_queue_t queue;
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dispatch_data_t data;
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dispatch_semaphore_t sem;
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const char *path;
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long my_global = 0;
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int main(int argc, const char *argv[]) {
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fprintf(stderr, "Hello world.\n");
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print_address("addr=", 1, &my_global);
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barrier_init(&barrier, 2);
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queue = dispatch_queue_create("my.queue", DISPATCH_QUEUE_CONCURRENT);
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sem = dispatch_semaphore_create(0);
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path = tempnam(NULL, "libdispatch-io-barrier-race-");
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char buf[1000];
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data = dispatch_data_create(buf, sizeof(buf), NULL, DISPATCH_DATA_DESTRUCTOR_DEFAULT);
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dispatch_io_t channel = dispatch_io_create_with_path(DISPATCH_IO_STREAM, path, O_CREAT | O_WRONLY, 0666, queue, ^(int error) { });
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if (! channel) abort();
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dispatch_io_set_high_water(channel, 1);
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dispatch_io_write(channel, 0, data, queue, ^(bool done, dispatch_data_t remainingData, int error) {
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if (error) abort();
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my_global = 42;
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barrier_wait(&barrier);
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});
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dispatch_io_barrier(channel, ^{
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barrier_wait(&barrier);
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my_global = 43;
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dispatch_semaphore_signal(sem);
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});
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dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
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dispatch_io_close(channel, 0);
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fprintf(stderr, "Done.\n");
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return 0;
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}
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// CHECK: Hello world.
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// CHECK: addr=[[ADDR:0x[0-9,a-f]+]]
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// CHECK: WARNING: ThreadSanitizer: data race
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// CHECK: Location is global 'my_global' {{(of size 8 )?}}at [[ADDR]] (io-barrier-race.c.tmp+0x{{[0-9,a-f]+}})
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// CHECK: Done.
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