Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/tsan/race_on_mutex.c

@@ -0,0 +1,40 @@
+// RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
+#include "test.h"
+
+pthread_mutex_t Mtx;
+int Global;
+
+void *Thread2(void *x) {
+  barrier_wait(&barrier);
+// CHECK:      WARNING: ThreadSanitizer: data race
+// CHECK-NEXT:   Atomic read of size 1 at {{.*}} by thread T2:
+// CHECK-NEXT:     #0 pthread_mutex_lock
+// CHECK-NEXT:     #1 Thread2{{.*}} {{.*}}race_on_mutex.c:[[@LINE+1]]{{(:3)?}} ({{.*}})
+  pthread_mutex_lock(&Mtx);
+  Global = 43;
+  pthread_mutex_unlock(&Mtx);
+  return NULL;
+}
+
+void *Thread1(void *x) {
+// CHECK:        Previous write of size {{[0-9]+}} at {{.*}} by thread T1:
+// CHECK:          #{{[0-9]+}} {{.*}}pthread_mutex_init {{.*}} ({{.*}})
+// CHECK-NEXT:     #{{[0-9]+}} Thread1{{.*}} {{.*}}race_on_mutex.c:[[@LINE+1]]{{(:3)?}} ({{.*}})
+  pthread_mutex_init(&Mtx, 0);
+  pthread_mutex_lock(&Mtx);
+  Global = 42;
+  pthread_mutex_unlock(&Mtx);
+  barrier_wait(&barrier);
+  return NULL;
+}
+
+int main() {
+  barrier_init(&barrier, 2);
+  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);
+  return 0;
+}