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author | Olivier Goffart <ogoffart@trolltech.com> | 2009-05-07 19:42:02 (GMT) |
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committer | Olivier Goffart <ogoffart@trolltech.com> | 2009-05-08 11:03:46 (GMT) |
commit | 3e7fc907e5cc1937fb98bf4581cee960fe3d4e7a (patch) | |
tree | 00bbcf6ba84b93546c136f6664e6081cd5679907 /src/corelib/io | |
parent | a2d584df2b72ed5bcd4886dcccafd7a54308f36b (diff) | |
download | Qt-3e7fc907e5cc1937fb98bf4581cee960fe3d4e7a.zip Qt-3e7fc907e5cc1937fb98bf4581cee960fe3d4e7a.tar.gz Qt-3e7fc907e5cc1937fb98bf4581cee960fe3d4e7a.tar.bz2 |
Fixes QDir not reentrant
qt_cmp_si_sort_flags could be read and written from different threads.
Use qStableSort with functor instead of libc's quicksort.
Found with helgrind on kdevelop
Reviewed-by: Marius Storm-Olsen
Diffstat (limited to 'src/corelib/io')
-rw-r--r-- | src/corelib/io/qdir.cpp | 47 |
1 files changed, 18 insertions, 29 deletions
diff --git a/src/corelib/io/qdir.cpp b/src/corelib/io/qdir.cpp index 6d75c59..b7861ba 100644 --- a/src/corelib/io/qdir.cpp +++ b/src/corelib/io/qdir.cpp @@ -50,6 +50,7 @@ #include "qstring.h" #include "qregexp.h" #include "qvector.h" +#include "qalgorithms.h" #ifdef QT_BUILD_CORE_LIB # include "qresource.h" #endif @@ -190,32 +191,28 @@ QDirPrivate::~QDirPrivate() /* For sorting */ struct QDirSortItem { - QString filename_cache; - QString suffix_cache; + mutable QString filename_cache; + mutable QString suffix_cache; QFileInfo item; }; -static int qt_cmp_si_sort_flags; -#if defined(Q_C_CALLBACKS) -extern "C" { -#endif -#ifdef Q_OS_WINCE -static int __cdecl qt_cmp_si(const void *n1, const void *n2) -#else -static int qt_cmp_si(const void *n1, const void *n2) -#endif -{ - if (!n1 || !n2) - return 0; +class QDirSortItemComparator { + int qt_cmp_si_sort_flags; +public: + QDirSortItemComparator(int flags) : qt_cmp_si_sort_flags(flags) {} + bool operator()(const QDirSortItem &, const QDirSortItem &); +}; - QDirSortItem* f1 = (QDirSortItem*)n1; - QDirSortItem* f2 = (QDirSortItem*)n2; +bool QDirSortItemComparator::operator()(const QDirSortItem &n1, const QDirSortItem &n2) +{ + const QDirSortItem* f1 = &n1; + const QDirSortItem* f2 = &n2; if ((qt_cmp_si_sort_flags & QDir::DirsFirst) && (f1->item.isDir() != f2->item.isDir())) - return f1->item.isDir() ? -1 : 1; + return f1->item.isDir(); if ((qt_cmp_si_sort_flags & QDir::DirsLast) && (f1->item.isDir() != f2->item.isDir())) - return f1->item.isDir() ? 1 : -1; + return !f1->item.isDir(); int r = 0; int sortBy = (qt_cmp_si_sort_flags & QDir::SortByMask) @@ -264,18 +261,11 @@ static int qt_cmp_si(const void *n1, const void *n2) : f1->filename_cache.compare(f2->filename_cache); } - if (r == 0) // Enforce an order - the order the items appear in the array - r = (char*)n1 - (char*)n2; - if (qt_cmp_si_sort_flags & QDir::Reversed) - return -r; - return r; + return r > 0; + return r < 0; } -#if defined(Q_C_CALLBACKS) -} -#endif - inline void QDirPrivate::sortFileList(QDir::SortFlags sort, QStringList &l, QStringList *names, QFileInfoList *infos) const { @@ -292,9 +282,8 @@ inline void QDirPrivate::sortFileList(QDir::SortFlags sort, QStringList &l, path += QLatin1Char('/'); si[i].item = QFileInfo(path + l.at(i)); } - qt_cmp_si_sort_flags = sort; if ((sort & QDir::SortByMask) != QDir::Unsorted) - qsort(si, i, sizeof(si[0]), qt_cmp_si); + qStableSort(si, si+i, QDirSortItemComparator(sort)); // put them back in the list(s) for (int j = 0; j<i; j++) { if(infos) |