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| author | Shane Kearns <ext-shane.2.kearns@nokia.com> | 2012-03-08 11:45:05 (GMT) |
|---|---|---|
| committer | Qt by Nokia <qt-info@nokia.com> | 2012-03-13 14:40:50 (GMT) |
| commit | a3a2ff59284840f1980197e3f6d06d99fcc0f512 (patch) | |
| tree | 95226afc1dfb521840e1c7f093ab149aaac85ff4 /src/corelib/io/qfile.cpp | |
| parent | 5bce44ef030a18d7ed3f6e3abf824d42ab84bf70 (diff) | |
| download | Qt-a3a2ff59284840f1980197e3f6d06d99fcc0f512.zip Qt-a3a2ff59284840f1980197e3f6d06d99fcc0f512.tar.gz Qt-a3a2ff59284840f1980197e3f6d06d99fcc0f512.tar.bz2 | |
Optimise QFile::seek that doesn't move the file pointer
If the seek position matches the current file position, then
avoid doing an implicit flush that could be expensive.
Change-Id: I019858ffb36fe832b9aee8da0a7803cafc8f7f75
Reviewed-by: Jaakko Helanti <ext-jaakko.helanti@nokia.com>
Reviewed-by: João Abecasis <joao.abecasis@nokia.com>
Diffstat (limited to 'src/corelib/io/qfile.cpp')
| -rw-r--r-- | src/corelib/io/qfile.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/corelib/io/qfile.cpp b/src/corelib/io/qfile.cpp index cfe0700..c8b349a 100644 --- a/src/corelib/io/qfile.cpp +++ b/src/corelib/io/qfile.cpp @@ -1692,6 +1692,9 @@ bool QFile::seek(qint64 off) return false; } + if (off == d->pos && off == d->devicePos) + return true; //avoid expensive flush for NOP seek to current position + if (!d->ensureFlushed()) return false; |