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When handing off a picture to a worker thread, copy it first

Browse source 
as otherwise we crash when the picture is freed before the
worker thread (to load from the net or to compute hashes)
is finished

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Robert C. Helling 2016-03-15 21:31:59 +01:00 • committed by Dirk Hohndel
parent 3c7e14a18f
commit 8a59d78faa
5 changed files with 30 additions and 6 deletions
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14
subsurface-core/dive.c
View file

@ -3374,7 +3374,7 @@ void dive_set_geodata_from_picture(struct dive *dive, struct picture *picture)
}
}
static void picture_free(struct picture *picture)
void picture_free(struct picture *picture)
{
if (!picture)
return;
@ -3383,6 +3383,18 @@ static void picture_free(struct picture *picture)
free(picture);
}
// When handling pictures in different threads, we need to copy them so we don't
// run into problems when the main thread frees the picture.
struct picture *clone_picture(struct picture *src)
{
struct picture *dst;
dst = alloc_picture();
copy_pl(src, dst);
return dst;
}
void dive_remove_picture(char *filename)
{
struct picture **picture = &current_dive->picture_list;

2
subsurface-core/dive.h
View file

@ -376,6 +376,7 @@ struct picture {
for (struct picture *picture = (_divestruct).picture_list; picture; picture = picture->next)
extern struct picture *alloc_picture();
extern struct picture *clone_picture(struct picture *src);
extern bool dive_check_picture_time(struct dive *d, int shift_time, timestamp_t timestamp);
extern void dive_create_picture(struct dive *d, char *filename, int shift_time, bool match_all);
extern void dive_add_picture(struct dive *d, struct picture *newpic);
@ -385,6 +386,7 @@ extern bool picture_check_valid(char *filename, int shift_time);
extern void picture_load_exif_data(struct picture *p);
extern timestamp_t picture_get_timestamp(char *filename);
extern void dive_set_geodata_from_picture(struct dive *d, struct picture *pic);
extern void picture_free(struct picture *picture);
extern int explicit_first_cylinder(struct dive *dive, struct divecomputer *dc);
extern int get_depth_at_time(struct divecomputer *dc, unsigned int time);

13
subsurface-core/imagedownloader.cpp
View file

@ -17,6 +17,11 @@ ImageDownloader::ImageDownloader(struct picture *pic)
picture = pic;
}
ImageDownloader::~ImageDownloader()
{
picture_free(picture);
}
void ImageDownloader::load(bool fromHash){
QUrl url;
if(fromHash)
@ -79,21 +84,21 @@ SHashedImage::SHashedImage(struct picture *picture) : QImage()
if (filename.isNull()) {
// That didn't produce a local filename.
// Try the cloud server
QtConcurrent::run(loadPicture, picture, true);
QtConcurrent::run(loadPicture, clone_picture(picture), true);
} else {
// Load locally from translated file name
load(filename);
if (!isNull()) {
// Make sure the hash still matches the image file
QtConcurrent::run(updateHash, picture);
QtConcurrent::run(updateHash, clone_picture(picture));
} else {
// Interpret filename as URL
QtConcurrent::run(loadPicture, picture, false);
QtConcurrent::run(loadPicture, clone_picture(picture), false);
}
}
} else {
// We loaded successfully. Now, make sure hash is up to date.
QtConcurrent::run(hashPicture, picture);
QtConcurrent::run(hashPicture, clone_picture(picture));
}
}

1
subsurface-core/imagedownloader.h
View file

@ -14,6 +14,7 @@ class ImageDownloader : public QObject {
Q_OBJECT;
public:
ImageDownloader(struct picture *picture);
~ImageDownloader();
void load(bool fromHash);
private:

6
subsurface-core/qthelper.cpp
View file

@ -1108,11 +1108,14 @@ QString fileFromHash(char *hash)
return localFilenameOf[QByteArray::fromHex(hash)];
}
// This needs to operate on a copy of picture as it frees it after finishing!
void updateHash(struct picture *picture) {
QByteArray hash = hashFile(fileFromHash(picture->hash));
learnHash(picture, hash);
picture_free(picture);
}
// This needs to operate on a copy of picture as it frees it after finishing!
void hashPicture(struct picture *picture)
{
char *oldHash = copy_string(picture->hash);
@ -1120,13 +1123,14 @@ void hashPicture(struct picture *picture)
if (!same_string(picture->hash, "") && !same_string(picture->hash, oldHash))
mark_divelist_changed((true));
free(oldHash);
picture_free(picture);
}
extern "C" void cache_picture(struct picture *picture)
{
QString filename = picture->filename;
if (!hashOf.contains(filename))
QtConcurrent::run(hashPicture, picture);
QtConcurrent::run(hashPicture, clone_picture(picture));
}
void learnImages(const QDir dir, int max_recursions)