Reduce file descriptor pressure on Unix platforms

When opening cached compilation units, we can close the file descriptor
after mmap'ing the contents, on Unix platforms.

Change-Id: Ifb797a69743ebdc5e55db0b2e52b5cd66d071ca3
Reviewed-by: Lars Knoll <[email protected]>

1 files changed, 8 insertions, 1 deletions

diff --git a/src/qml/compiler/qv4compilationunitmapper_p.h b/src/qml/compiler/qv4compilationunitmapper_p.h
index 06ca3d0e02..119111ccd6 100644
--- a/src/qml/compiler/qv4compilationunitmapper_p.h
+++ b/src/qml/compiler/qv4compilationunitmapper_p.h
@@ -66,13 +66,20 @@ class CompilationUnitMapper
 {
 public:
     CompilationUnitMapper();
+    ~CompilationUnitMapper();
 
     CompiledData::Unit *open(const QString &sourcePath, QString *errorString);
     void close();
 
 private:
+    static bool verifyHeader(const QV4::CompiledData::Unit *header, const QString &sourcePath, QString *errorString);
+
+#if defined(Q_OS_UNIX)
+    size_t length;
+#else
     QFile f;
-    uchar *dataPtr;
+#endif
+    void *dataPtr;
 };
 
 }