1 files changed, 62 insertions, 0 deletions
diff --git a/libartbase/base/scoped_flock_test.cc b/libartbase/base/scoped_flock_test.cc
new file mode 100644
index 0000000000..1b6caaf747
--- /dev/null
+++ b/libartbase/base/scoped_flock_test.cc
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "scoped_flock.h"
+
+#include "common_runtime_test.h"
+
+namespace art {
+
+class ScopedFlockTest : public CommonRuntimeTest {};
+
+TEST_F(ScopedFlockTest, TestLocking) {
+  ScratchFile scratch_file;
+  std::string error_msg;
+
+  // NOTE: Locks applied using flock(2) and fcntl(2) are oblivious
+  // to each other, so attempting to query locks set by flock using
+  // using fcntl(,F_GETLK,) will not work. see kernel doc at
+  // Documentation/filesystems/locks.txt.
+  {
+    ScopedFlock file_lock = LockedFile::Open(scratch_file.GetFilename().c_str(),
+                                             &error_msg);
+    ASSERT_TRUE(file_lock.get() != nullptr);
+
+    // Attempt to acquire a second lock on the same file. This must fail.
+    ScopedFlock second_lock = LockedFile::Open(scratch_file.GetFilename().c_str(),
+                                               O_RDONLY,
+                                               /* block */ false,
+                                               &error_msg);
+    ASSERT_TRUE(second_lock.get() == nullptr);
+    ASSERT_TRUE(!error_msg.empty());
+  }
+
+  {
+    // Attempt to reacquire the lock once the first lock has been released, this
+    // must succeed.
+    ScopedFlock file_lock = LockedFile::Open(scratch_file.GetFilename().c_str(),
+                                             &error_msg);
+    ASSERT_TRUE(file_lock.get() != nullptr);
+  }
+
+  {
+    ScopedFlock file_lock = LockedFile::Open("/will/not/exist",
+                                             &error_msg);
+    ASSERT_TRUE(file_lock.get() == nullptr);
+  }
+}
+
+}  // namespace art