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3ab6b2347e
Even sleep(1) lead to episodical flakes on some machines. Use an invisible by tsan barrier to enforce required execution order instead. This makes the tests deterministic and faster. llvm-svn: 226659
42 lines
810 B
C++
42 lines
810 B
C++
// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
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#include "test.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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int X;
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void *Thread1(void *x) {
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barrier_wait(&barrier);
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int f = open("/dev/random", O_RDONLY);
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char buf;
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read(f, &buf, 1);
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close(f);
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X = 42;
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return NULL;
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}
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void *Thread2(void *x) {
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X = 43;
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write(STDOUT_FILENO, "a", 1);
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barrier_wait(&barrier);
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return NULL;
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}
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int main() {
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barrier_init(&barrier, 2);
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pthread_t t[2];
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pthread_create(&t[0], NULL, Thread1, NULL);
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pthread_create(&t[1], NULL, Thread2, NULL);
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pthread_join(t[0], NULL);
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pthread_join(t[1], NULL);
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}
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// CHECK: WARNING: ThreadSanitizer: data race
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// CHECK: Write of size 4
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// CHECK: #0 Thread1
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// CHECK: Previous write of size 4
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// CHECK: #0 Thread2
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