simple lock wrapper

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>

include/qtaround/os.hpp

@@ -17,6 +17,10 @@
 #include <QString>
 #include <QVariant>
 #include <QDateTime>
+#include <QLockFile>
+
+#include <memory>
+
 
 namespace qtaround { namespace os {
 
@@ -235,6 +239,35 @@ static inline QString getTemp(A &&...args)
     return os::path::join(getTemp(), std::forward<A>(args)...);
 }
 
+typedef std::unique_ptr<QLockFile> LockFileHandle;
+class FileLock
+{
+public:
+    FileLock(LockFileHandle &&from) : lock_(std::move(from)) {}
+    //lock_ is movable only
+private:
+    LockFileHandle lock_;
+};
+
+template <typename OnLocked>
+LockFileHandle tryLock(LockFileHandle &&locker, OnLocked fn)
+{
+    if (locker) {
+        if (locker->tryLock()) {
+            fn(FileLock(std::move(locker)));
+            return nullptr;
+        }
+    }
+    return std::move(locker);
+}
+
+template <typename OnLocked>
+LockFileHandle tryLock(QString const &fileName, OnLocked fn)
+{
+    LockFileHandle h{new QLockFile(fileName)};
+    return tryLock(std::move(h), fn);
+}
+
 }}
 
 #endif // _CUTES_OS_HPP_

src/os.cpp

@@ -11,6 +11,11 @@
 #include <qtaround/debug.hpp>
 #include <QDebug>
 
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <cor/util.hpp>
+#include <tuple>
+
 namespace qtaround { namespace os {
 
 namespace path {
@@ -384,4 +389,5 @@ QString mkTemp(QVariantMap &&options)
     return res.trimmed();
 }
 
+
 }} // os