Fix boolean logic in LockFileManager and test it

This fixes a bug from r187826.

Reviewers: hans

Differential Revision: http://llvm-reviews.chandlerc.com/D1304

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187846 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 49 insertions, 0 deletions

diff --git a/unittests/Support/CMakeLists.txt b/unittests/Support/CMakeLists.txt
index 5f26d5d745..197561ebaa 100644
--- a/unittests/Support/CMakeLists.txt
+++ b/unittests/Support/CMakeLists.txt
@@ -20,6 +20,7 @@ add_llvm_unittest(SupportTests
   IntegersSubsetTest.cpp
   LeakDetectorTest.cpp
   LocaleTest.cpp
+  LockFileManagerTest.cpp
   ManagedStatic.cpp
   MathExtrasTest.cpp
   MD5Test.cpp
diff --git a/unittests/Support/LockFileManagerTest.cpp b/unittests/Support/LockFileManagerTest.cpp
new file mode 100644
index 0000000000..5c73b9f5e2
--- /dev/null
+++ b/unittests/Support/LockFileManagerTest.cpp
@@ -0,0 +1,48 @@
+//===- unittests/LockFileManagerTest.cpp - LockFileManager tests ----------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/LockFileManager.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
+
+#include "gtest/gtest.h"
+
+#include <memory>
+
+using namespace llvm;
+
+namespace {
+
+TEST(LockFileManagerTest, Basic) {
+  SmallString<64> TmpDir;
+  error_code EC;
+  EC = sys::fs::createUniqueDirectory("LockFileManagerTestDir", TmpDir);
+  ASSERT_FALSE(EC);
+
+  SmallString<64> LockedFile(TmpDir);
+  sys::path::append(LockedFile, "file.lock");
+
+  {
+    // The lock file should not exist, so we should successfully acquire it.
+    LockFileManager Locked1(LockedFile);
+    EXPECT_EQ(LockFileManager::LFS_Owned, Locked1.getState());
+
+    // Attempting to reacquire the lock should fail.  Waiting on it would cause
+    // deadlock, so don't try that.
+    LockFileManager Locked2(LockedFile);
+    EXPECT_NE(LockFileManager::LFS_Owned, Locked2.getState());
+  }
+
+  // Now that the lock is out of scope, the file should be gone.
+  EXPECT_FALSE(sys::fs::exists(StringRef(LockedFile)));
+
+  sys::fs::remove_all(StringRef(TmpDir));
+}
+
+} // end anonymous namespace