1 files changed, 101 insertions, 0 deletions
diff --git a/src/lib/log/tests/logger_lock_test.cc b/src/lib/log/tests/logger_lock_test.cc
new file mode 100644
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+++ b/src/lib/log/tests/logger_lock_test.cc
@@ -0,0 +1,101 @@
+// Copyright (C) 2012-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <log/macros.h>
+#include <log/logger_support.h>
+#include <log/logger_manager.h>
+#include <log/log_messages.h>
+#include <log/interprocess/interprocess_sync.h>
+#include <log/tests/log_test_messages.h>
+
+#include <mutex>
+#include <iostream>
+
+#include <boost/noncopyable.hpp>
+
+using namespace std;
+using namespace isc::log;
+
+/// \brief RAII safe mutex checker.
+class CheckMutex : boost::noncopyable {
+public:
+    /// \brief Exception thrown when the mutex is already locked.
+    struct AlreadyLocked : public isc::InvalidParameter {
+        AlreadyLocked(const char* file, size_t line, const char* what) :
+            isc::InvalidParameter(file, line, what)
+        {}
+    };
+
+    /// \brief Constructor.
+    ///
+    /// \throw AlreadyLocked if the mutex is already locked.
+    CheckMutex(mutex& mutex) : mutex_(mutex) {
+        if (!mutex.try_lock()) {
+            isc_throw(AlreadyLocked, "The mutex is already locked");
+        }
+    }
+
+    /// \brief Destructor.
+    ///
+    /// Unlocks the mutex.
+    ~CheckMutex() {
+        mutex_.unlock();
+    }
+
+private:
+    mutex& mutex_;
+};
+
+class MockLoggingSync : public isc::log::interprocess::InterprocessSync {
+public:
+    /// \brief Constructor
+    MockLoggingSync(const std::string& component_name) :
+        InterprocessSync(component_name)
+    {}
+
+protected:
+    virtual bool lock() {
+        // We first check if the logger acquired a lock on the
+        // LoggerManager mutex.
+        try {
+            CheckMutex check(LoggerManager::getMutex());
+        } catch (const CheckMutex::AlreadyLocked&) {
+            cout << "FIELD1 FIELD2 LOGGER_LOCK_TEST: MUTEXLOCK\n";
+        }
+
+        cout << "FIELD1 FIELD2 LOGGER_LOCK_TEST: LOCK\n";
+        return (true);
+    }
+
+    virtual bool tryLock() {
+        cout << "FIELD1 FIELD2 LOGGER_LOCK_TEST: TRYLOCK\n";
+        return (true);
+    }
+
+    virtual bool unlock() {
+        cout << "FIELD1 FIELD2 LOGGER_LOCK_TEST: UNLOCK\n";
+        return (true);
+    }
+};
+
+/// \brief Test logger lock sequence
+///
+/// A program used in testing the logger. It verifies that (1) an
+/// interprocess sync lock is first acquired by the logger, (2) the
+/// message is logged by the logger, and (3) the lock is released in
+/// that sequence.
+int
+main(int, char**) {
+    initLogger();
+    Logger logger("log");
+    logger.setInterprocessSync(new MockLoggingSync("log"));
+
+    LOG_INFO(logger, LOG_LOCK_TEST_MESSAGE);
+
+    return (0);
+}