[tsan] rudimentary support for deadlock detector in tsan (nothing really works yet except for a single tiny test). Also rename tsan's DeadlockDetector to InternalDeadlockDetector

llvm-svn: 201407

1 files changed, 25 insertions, 0 deletions

diff --git a/compiler-rt/lib/tsan/lit_tests/mutex_cycle2.c b/compiler-rt/lib/tsan/lit_tests/mutex_cycle2.c
new file mode 100644
index 00000000000..cd1006d4760
--- /dev/null
+++ b/compiler-rt/lib/tsan/lit_tests/mutex_cycle2.c
@@ -0,0 +1,25 @@
+// RUN: %clangxx_tsan %s -o %t
+// RUN: TSAN_OPTIONS=detect_deadlocks=1 %t 2>&1 | FileCheck %s
+#include <pthread.h>
+
+int main() {
+  pthread_mutex_t mu1, mu2;
+  pthread_mutex_init(&mu1, NULL);
+  pthread_mutex_init(&mu2, NULL);
+
+  // mu1 => mu2
+  pthread_mutex_lock(&mu1);
+  pthread_mutex_lock(&mu2);
+  pthread_mutex_unlock(&mu2);
+  pthread_mutex_unlock(&mu1);
+
+  // mu2 => mu1
+  pthread_mutex_lock(&mu2);
+  pthread_mutex_lock(&mu1);
+  // CHECK: ThreadSanitizer: lock-order-inversion (potential deadlock)
+  pthread_mutex_unlock(&mu1);
+  pthread_mutex_unlock(&mu2);
+
+  pthread_mutex_destroy(&mu1);
+  pthread_mutex_destroy(&mu2);
+}