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Fix Hunspell crashes when using multiple Hunspell dictionaries simultaneously.

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Evidently Hunspell is not reentrant, so we serialize all Hunspell calls using a single mutex.
This commit is contained in:
Konstantin Isakov 2011-03-03 22:24:13 -08:00
parent bfed454649
commit d1672af670
1 changed files with 17 additions and 4 deletions
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21
hunspell.cc
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@ -29,7 +29,6 @@ namespace {
class HunspellDictionary: public Dictionary::Class
{
string name;
Mutex hunspellMutex;
Hunspell hunspell;
public:
@ -69,6 +68,20 @@ public:
vector< wstring > const & alts,
wstring const & )
throw( std::exception );
private:
// We used to have a separate mutex for each Hunspell instance, assuming
// that its code was reentrant (though probably not thread-safe). However,
// crashes were discovered later when using several Hunspell dictionaries
// simultaneously, and we've switched to have a single mutex for all hunspell
// calls - evidently it's not really reentrant.
static Mutex & getHunspellMutex()
{
static Mutex mutex;
return mutex;
}
// Mutex hunspellMutex;
};
/// Encodes the given string to be passed to the hunspell object. May throw
@ -259,7 +272,7 @@ sptr< DataRequest > HunspellDictionary::getArticle( wstring const & word,
wstring const & )
throw( std::exception )
{
return new HunspellArticleRequest( word, hunspellMutex, hunspell );
return new HunspellArticleRequest( word, getHunspellMutex(), hunspell );
}
/// HunspellDictionary::findHeadwordsForSynonym()
@ -478,7 +491,7 @@ QVector< wstring > HunspellHeadwordsRequest::suggest( wstring & word )
sptr< WordSearchRequest > HunspellDictionary::findHeadwordsForSynonym( wstring const & word )
throw( std::exception )
{
return new HunspellHeadwordsRequest( word, hunspellMutex, hunspell );
return new HunspellHeadwordsRequest( word, getHunspellMutex(), hunspell );
}
@ -593,7 +606,7 @@ sptr< WordSearchRequest > HunspellDictionary::prefixMatch( wstring const & word,
unsigned long /*maxResults*/ )
throw( std::exception )
{
return new HunspellPrefixMatchRequest( word, hunspellMutex, hunspell );
return new HunspellPrefixMatchRequest( word, getHunspellMutex(), hunspell );
}