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GUI: lock handler cache against multiple thread access

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This commit is contained in:
Jean-Francois Dockes 2011-04-24 08:47:27 +02:00
parent c192e2fd3e
commit 52fda2a075
1 changed files with 27 additions and 4 deletions
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31
src/internfile/mimehandler.cpp
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@ -1,7 +1,6 @@
#ifndef lint
static char rcsid[] = "@(#$Id: mimehandler.cpp,v 1.25 2008-10-09 09:19:37 dockes Exp $ (C) 2004 J.F.Dockes";
#endif
/*
* Copyright 2004 J.F.Dockes
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
@ -29,6 +28,7 @@ using namespace std;
#include "debuglog.h"
#include "rclconfig.h"
#include "smallut.h"
#include "pthread.h"
#include "mh_exec.h"
#include "mh_execm.h"
@ -45,9 +45,29 @@ using namespace std;
//
// FIXME: this is not compatible with multiple threads and a potential
// problem in the recoll gui (indexing thread + preview request). A
// simple lock would be enough as handlers are removed from the cache
// simple lock should be enough as handlers are removed from the cache
// while in use and multiple copies are allowed
static multimap<string, Dijon::Filter*> o_handlers;
pthread_mutex_t o_handlers_mutex;
class HandlersLocker {
public:
HandlersLocker()
{
pthread_mutex_lock(&o_handlers_mutex);
}
~HandlersLocker()
{
pthread_mutex_unlock(&o_handlers_mutex);
}
};
class HandlersLockerInit {
public:
HandlersLockerInit()
{
pthread_mutex_init(&o_handlers_mutex, 0);
}
};
static HandlersLockerInit o_hli;
/** For mime types set as "internal" in mimeconf:
* create appropriate handler object. */
@ -143,6 +163,7 @@ void returnMimeHandler(Dijon::Filter *handler)
typedef multimap<string, Dijon::Filter*>::value_type value_type;
if (handler) {
handler->clear();
HandlersLocker locker;
o_handlers.insert(value_type(handler->get_mime_type(), handler));
}
}
@ -151,6 +172,7 @@ void clearMimeHandlerCache()
{
typedef multimap<string, Dijon::Filter*>::value_type value_type;
map<string, Dijon::Filter *>::iterator it;
HandlersLocker locker;
for (it = o_handlers.begin(); it != o_handlers.end(); it++) {
delete it->second;
}
@ -165,6 +187,7 @@ Dijon::Filter *getMimeHandler(const string &mtype, RclConfig *cfg,
LOGDEB2(("getMimeHandler: mtype [%s] filtertypes %d\n",
mtype.c_str(), filtertypes));
Dijon::Filter *h = 0;
HandlersLocker locker;
// Get handler definition for mime type. We do this even if an
// appropriate handler object may be in the cache (indexed by mime