KConfig sync speedup patch rev 1

[Simon Hausmann]

On Tue, Sep 09, 2003 at 09:09:38AM -0400, Ian Reinhart Geiser wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Hi,
> 	At n7y I worked out this patch with the help of david.  It seems to speed up 
> some apps when i measure them with calltree.  The issue was that before this 
> patch every time you call sync the config file is reparsed.  This patch 
> causes the config file not to be reparsed unless it has changed on disk since 
> the last write.

Excellent idea :)

Two things I spotted:

> class QFile;
>@@ -280,6 +281,7 @@
>   virtual void virtual_hook( int id, void* data );
> private:
>   KConfigINIBackEndPrivate *d;
>+  QDateTime bModTime;
> };

I think you need to re-use the d pointer here, as the class is part
of the public API.

>+#include <execinfo.h>
>+#include <stdlib.h>
>+
>+static QString qBacktrace( int levels = -1 )
>+{
>+    QString s;
>+    void* trace[256];
>+    int n = backtrace(trace, 256);
>+    char** strings = backtrace_symbols (trace, n);
>+
>+    if ( levels != -1 )
>+        n = QMIN( n, levels );
>+    s = "[\n";
>+
>+    for (int i = 0; i < n; ++i)
>+        s += QString::number(i) +
>+             QString::fromLatin1(": ") +
>+             QString::fromLatin1(strings[i]) + QString::fromLatin1("\n");
>+    s += "]\n";
>+    free (strings);
>+    return s;
>+}
>+

I guess this isn't meant to be part of the patch :)

Simon