forked from OSchip/llvm-project
43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
// RUN: %clang_tsan -O1 %s -o %t && %t 2>&1 | FileCheck %s
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#include <pthread.h>
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#include <stdio.h>
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#include <stddef.h>
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#include <unistd.h>
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pthread_mutex_t Mtx;
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int Global;
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void *Thread1(void *x) {
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pthread_mutex_init(&Mtx, 0);
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pthread_mutex_lock(&Mtx);
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Global = 42;
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pthread_mutex_unlock(&Mtx);
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return NULL;
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}
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void *Thread2(void *x) {
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sleep(1);
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pthread_mutex_lock(&Mtx);
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Global = 43;
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pthread_mutex_unlock(&Mtx);
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return NULL;
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}
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int main() {
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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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pthread_mutex_destroy(&Mtx);
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return 0;
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}
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// CHECK: WARNING: ThreadSanitizer: data race
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// CHECK-NEXT: Read of size 1 at {{.*}} by thread T2:
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// CHECK-NEXT: #0 pthread_mutex_lock
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// CHECK-NEXT: #1 Thread2{{.*}} {{.*}}race_on_mutex.c:20{{(:3)?}} ({{.*}})
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// CHECK: Previous write of size 1 at {{.*}} by thread T1:
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// CHECK-NEXT: #0 pthread_mutex_init {{.*}} ({{.*}})
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// CHECK-NEXT: #1 Thread1{{.*}} {{.*}}race_on_mutex.c:11{{(:3)?}} ({{.*}})
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