1 files changed, 38 insertions, 0 deletions
diff --git a/compiler-rt/lib/tsan/lit_tests/mutexset1.cc b/compiler-rt/lib/tsan/lit_tests/mutexset1.cc
new file mode 100644
index 00000000000..1140e545db2
--- /dev/null
+++ b/compiler-rt/lib/tsan/lit_tests/mutexset1.cc
@@ -0,0 +1,38 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %t 2>&1 | FileCheck %s
+#include <pthread.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int Global;
+pthread_mutex_t mtx;
+
+void *Thread1(void *x) {
+  usleep(100*1000);
+  pthread_mutex_lock(&mtx);
+  Global++;
+  pthread_mutex_unlock(&mtx);
+  return NULL;
+}
+
+void *Thread2(void *x) {
+  Global--;
+  return NULL;
+}
+
+int main() {
+  pthread_mutex_init(&mtx, 0);
+  pthread_t t[2];
+  pthread_create(&t[0], NULL, Thread1, NULL);
+  pthread_create(&t[1], NULL, Thread2, NULL);
+  pthread_join(t[0], NULL);
+  pthread_join(t[1], NULL);
+  pthread_mutex_destroy(&mtx);
+}
+
+// CHECK: WARNING: ThreadSanitizer: data race
+// CHECK:   Write of size 4 at {{.*}} by thread T1 (mutexes: write M1):
+// CHECK:   Previous write of size 4 at {{.*}} by thread T2:
+// CHECK:   Mutex M1 created at:
+// CHECK:     #0 pthread_mutex_init
+// CHECK:     #1 main {{.*}}/mutexset1.cc:23
+