walkero
/
fontconfig
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Make cache hash threadsafe 

This concludes my first pass at making fontconfig threadsafe.  Now to
testing and actually fixing it!
This commit is contained in:
Behdad Esfahbod 2012-10-10 15:24:31 -04:00
parent adb03b730d
commit 68b8ae9af8
1 changed files with 30 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
src/fccache.c
View File

@ -248,6 +248,7 @@ struct _FcCacheSkip {
#define FC_CACHE_MAX_LEVEL 16
/* Protected by cache_lock below */
static FcCacheSkip *fcCacheChains[FC_CACHE_MAX_LEVEL];
static int fcCacheMaxLevel;
@ -383,6 +384,8 @@ FcCacheInsert (FcCache *cache, struct stat *cache_stat)
FcCacheSkip *s, **next;
int i, level;
lock_cache ();
/*
* Find links along each chain
*/
@ -434,11 +437,13 @@ FcCacheInsert (FcCache *cache, struct stat *cache_stat)
s->next[i] = *update[i];
*update[i] = s;
}
unlock_cache ();
return FcTrue;
}
static FcCacheSkip *
FcCacheFindByAddr (void *object)
FcCacheFindByAddrUnlocked (void *object)
{
int i;
FcCacheSkip **next = fcCacheChains;
@ -459,6 +464,16 @@ FcCacheFindByAddr (void *object)
return NULL;
}
static FcCacheSkip *
FcCacheFindByAddr (void *object)
{
FcCacheSkip *ret;
lock_cache ();
ret = FcCacheFindByAddrUnlocked (object);
unlock_cache ();
return ret;
}
static void
FcCacheRemove (FcCache *cache)
{
@ -469,6 +484,7 @@ FcCacheRemove (FcCache *cache)
/*
* Find links along each chain
*/
lock_cache ();
next = fcCacheChains;
for (i = fcCacheMaxLevel; --i >= 0; )
{
@ -482,6 +498,7 @@ FcCacheRemove (FcCache *cache)
*update[i] = s->next[i];
while (fcCacheMaxLevel > 0 && fcCacheChains[fcCacheMaxLevel - 1] == NULL)
fcCacheMaxLevel--;
unlock_cache ();
free (s);
}
@ -490,14 +507,17 @@ FcCacheFindByStat (struct stat *cache_stat)
{
FcCacheSkip *s;
lock_cache ();
for (s = fcCacheChains[0]; s; s = s->next[0])
if (s->cache_dev == cache_stat->st_dev &&
s->cache_ino == cache_stat->st_ino &&
s->cache_mtime == cache_stat->st_mtime)
{
FcRefInc (&s->ref);
unlock_cache ();
return s->cache;
}
unlock_cache ();
return NULL;
}
@ -987,14 +1007,17 @@ FcDirCacheWrite (FcCache *cache, FcConfig *config)
* new cache file is not read again. If it's large, we don't do that
* such that we reload it, using mmap, which is shared across processes.
*/
if (cache->size < FC_CACHE_MIN_MMAP &&
(skip = FcCacheFindByAddr (cache)) &&
FcStat (cache_hashed, &cache_stat))
if (cache->size < FC_CACHE_MIN_MMAP && FcStat (cache_hashed, &cache_stat))
{
lock_cache ();
if ((skip = FcCacheFindByAddrUnlocked (cache)))
{
skip->cache_dev = cache_stat.st_dev;
skip->cache_ino = cache_stat.st_ino;
skip->cache_mtime = cache_stat.st_mtime;
}
unlock_cache ();
}
FcStrFree (cache_hashed);
FcAtomicUnlock (atomic);