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improve stability for Cache Manager and avoid race conditions.

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preparation step 2 for making dcraw multithread safe.
This commit is contained in:
Steve Herrell
2010-10-28 17:33:11 +02:00
parent d22d77c507
commit 3c747f1d77
5 changed files with 102 additions and 35 deletions
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98
rtgui/cachemanager.cc
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@@ -24,10 +24,26 @@
#include <procparamchangers.h>
#include <safegtk.h>
CacheManager cacheMgr;
CacheManager*
CacheManager::getInstance(void)
{
static CacheManager* instance_ = 0;
if ( instance_ == 0 )
{
static Glib::Mutex smutex_;
Glib::Mutex::Lock lock(smutex_);
if ( instance_ == 0 )
{
instance_ = new CacheManager();
}
}
return instance_;
}
void CacheManager::init () {
Glib::Mutex::Lock lock(mutex_);
openEntries.clear ();
baseDir = options.cacheBaseDir;
@@ -49,12 +65,18 @@ Thumbnail* CacheManager::getEntry (const Glib::ustring& fname) {
Thumbnail* res = NULL;
std::map<std::string, Thumbnail*>::iterator r = openEntries.find (fname);
// if it is open, return it
if (r!=openEntries.end()) {
r->second->increaseRef ();
return r->second;
}
// take manager lock and search for entry, if found return it else release
// lock and create it
{
Glib::Mutex::Lock lock(mutex_);
string_thumb_map::iterator r = openEntries.find (fname);
// if it is open, return it
if (r!=openEntries.end()) {
r->second->increaseRef ();
return r->second;
}
}
// compute the md5
std::string md5 = getMD5 (fname);
@@ -78,6 +100,7 @@ Thumbnail* CacheManager::getEntry (const Glib::ustring& fname) {
}
// if not, create a new one
if (!res) {
res = new Thumbnail (this, fname, md5);
if (!res->isSupported ()) {
delete res;
@@ -85,20 +108,45 @@ Thumbnail* CacheManager::getEntry (const Glib::ustring& fname) {
}
}
// retake the lock and see if it was added while we we're unlocked, if it
// was use it over our version. if not added we create the cache entry
if (res)
openEntries[fname] = res;
{
Glib::Mutex::Lock lock(mutex_);
string_thumb_map::iterator r = openEntries.find (fname);
if (r!=openEntries.end()) {
delete res;
r->second->increaseRef ();
return r->second;
}
// it wasn't, create a new entry
openEntries[fname] = res;
}
return res;
}
void CacheManager::deleteEntry (const Glib::ustring& fname) {
Glib::Mutex::Lock lock(mutex_);
// check if it is opened
std::map<std::string, Thumbnail*>::iterator r = openEntries.find (fname);
string_thumb_map::iterator r = openEntries.find (fname);
// if it is open, dont delete it
if (r!=openEntries.end()) {
std::string md5 = r->second->getMD5 ();
r->second->decreaseRef ();
// decrease reference count; this will call back into CacheManager so
// we release the lock for it.
{
lock.release();
r->second->decreaseRef ();
lock.acquire();
}
// if in the editor, the thumbnail still exists. If not, delete it:
r = openEntries.find (fname);
if (r==openEntries.end() && md5!="") {
@@ -126,6 +174,8 @@ void CacheManager::deleteEntry (const Glib::ustring& fname) {
void CacheManager::renameEntry (const std::string& oldfilename, const std::string& oldmd5, const std::string& newfilename) {
Glib::Mutex::Lock lock(mutex_);
std::string newmd5 = getMD5 (newfilename);
::g_rename ((getCacheFileName ("profiles", oldfilename, oldmd5) + paramFileExtension).c_str(), (getCacheFileName ("profiles", newfilename, newmd5) + paramFileExtension).c_str());
@@ -136,7 +186,7 @@ void CacheManager::renameEntry (const std::string& oldfilename, const std::strin
::g_rename ((getCacheFileName ("data", oldfilename, oldmd5) + ".txt").c_str(), (getCacheFileName ("data", newfilename, newmd5) + ".txt").c_str());
// check if it is opened
std::map<std::string, Thumbnail*>::iterator r = openEntries.find (oldfilename);
string_thumb_map::iterator r = openEntries.find (oldfilename);
// if it is open, update md5
if (r!=openEntries.end()) {
Thumbnail* t = r->second;
@@ -150,8 +200,10 @@ void CacheManager::renameEntry (const std::string& oldfilename, const std::strin
void CacheManager::closeThumbnail (Thumbnail* t) {
Glib::Mutex::Lock lock(mutex_);
t->updateCache ();
std::map<std::string, Thumbnail*>::iterator r = openEntries.find (t->getFileName());
string_thumb_map::iterator r = openEntries.find (t->getFileName());
if (r!=openEntries.end())
openEntries.erase (r);
delete t;
@@ -159,11 +211,15 @@ void CacheManager::closeThumbnail (Thumbnail* t) {
void CacheManager::closeCache () {
Glib::Mutex::Lock lock(mutex_);
applyCacheSizeLimitation ();
}
void CacheManager::clearAll () {
Glib::Mutex::Lock lock(mutex_);
deleteDir ("images");
deleteDir ("aehistograms");
deleteDir ("embprofiles");
@@ -171,7 +227,7 @@ void CacheManager::clearAll () {
deleteDir ("data");
// re-generate thumbnail images and clear profiles of open thumbnails
std::map<std::string, Thumbnail*>::iterator i;
string_thumb_map::iterator i;
for (i=openEntries.begin(); i!=openEntries.end(); i++) {
i->second->clearProcParams (CACHEMGR);
i->second->generateThumbnailImage ();
@@ -180,21 +236,25 @@ void CacheManager::clearAll () {
}
void CacheManager::clearThumbImages () {
Glib::Mutex::Lock lock(mutex_);
deleteDir ("images");
deleteDir ("aehistograms");
deleteDir ("embprofiles");
// re-generate thumbnail images of open thumbnails
std::map<std::string, Thumbnail*>::iterator i;
string_thumb_map::iterator i;
for (i=openEntries.begin(); i!=openEntries.end(); i++)
i->second->generateThumbnailImage ();
}
void CacheManager::clearProfiles () {
Glib::Mutex::Lock lock(mutex_);
deleteDir ("profiles");
// clear profiles of open thumbnails
std::map<std::string, Thumbnail*>::iterator i;
string_thumb_map::iterator i;
for (i=openEntries.begin(); i!=openEntries.end(); i++)
i->second->clearProcParams (CACHEMGR);
}
@@ -234,9 +294,9 @@ void CacheManager::applyCacheSizeLimitation () {
std::vector<FileMTimeInfo> flist;
Glib::ustring dataDir = Glib::build_filename (baseDir, "data");
Glib::RefPtr<Gio::File> dir = Gio::File::create_for_path (dataDir);
safe_build_file_list (dir, flist);
safe_build_file_list (dir, flist);
if (flist.size() > options.maxCacheEntries) {
std::sort (flist.begin(), flist.end());
while (flist.size() > options.maxCacheEntries) {
@@ -245,7 +305,7 @@ void CacheManager::applyCacheSizeLimitation () {
::g_remove ((Glib::build_filename (Glib::build_filename (baseDir, "images"), flist.front().fname) + ".jpg").c_str());
::g_remove ((Glib::build_filename (Glib::build_filename (baseDir, "aehistograms"), flist.front().fname)).c_str());
::g_remove ((Glib::build_filename (Glib::build_filename (baseDir, "embprofiles"), flist.front().fname) + ".icc").c_str());
// ::g_remove ((Glib::build_filename (Glib::build_filename (baseDir, "profiles"), flist.front().fname) + paramFileExtension).c_str());
// ::g_remove ((Glib::build_filename (Glib::build_filename (baseDir, "profiles"), flist.front().fname) + paramFileExtension).c_str());
flist.erase (flist.begin());
}
}