tsan: add mutexsets to reports

With this change reports say what mutexes the threads hold around the racy memory accesses.

llvm-svn: 169493

1 files changed, 54 insertions, 0 deletions

diff --git a/compiler-rt/lib/tsan/lit_tests/mutexset6.cc b/compiler-rt/lib/tsan/lit_tests/mutexset6.cc
new file mode 100644
index 00000000000..e25088c2ab5
--- /dev/null
+++ b/compiler-rt/lib/tsan/lit_tests/mutexset6.cc
@@ -0,0 +1,54 @@
+// 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 mtx1;
+pthread_spinlock_t mtx2;
+pthread_rwlock_t mtx3;
+
+void *Thread1(void *x) {
+  usleep(100*1000);
+  pthread_mutex_lock(&mtx1);
+  Global++;
+  pthread_mutex_unlock(&mtx1);
+  return NULL;
+}
+
+void *Thread2(void *x) {
+  pthread_mutex_lock(&mtx1);
+  pthread_mutex_unlock(&mtx1);
+  pthread_spin_lock(&mtx2);
+  pthread_rwlock_rdlock(&mtx3);
+  Global--;
+  pthread_spin_unlock(&mtx2);
+  pthread_rwlock_unlock(&mtx3);
+  return NULL;
+}
+
+int main() {
+  pthread_mutex_init(&mtx1, 0);
+  pthread_spin_init(&mtx2, 0);
+  pthread_rwlock_init(&mtx3, 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(&mtx1);
+  pthread_spin_destroy(&mtx2);
+  pthread_rwlock_destroy(&mtx3);
+}
+
+// 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:                                          (mutexes: write M2, read M3):
+// CHECK:   Mutex M1 created at:
+// CHECK:     #1 main {{.*}}/mutexset6.cc:31
+// CHECK:   Mutex M2 created at:
+// CHECK:     #1 main {{.*}}/mutexset6.cc:32
+// CHECK:   Mutex M3 created at:
+// CHECK:     #1 main {{.*}}/mutexset6.cc:33
+