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threaded delta search: proper locking for cache accounting

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Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nicolas Pitre 2007-09-10 11:10:11 -04:00 committed by Junio C Hamano
parent 693b86fffb
commit 3c70183918
1 changed files with 20 additions and 4 deletions
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24
builtin-pack-objects.c
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@ -1301,6 +1301,10 @@ static pthread_mutex_t read_mutex = PTHREAD_MUTEX_INITIALIZER;
#define read_lock() pthread_mutex_lock(&read_mutex)
#define read_unlock() pthread_mutex_unlock(&read_mutex)
static pthread_mutex_t cache_mutex = PTHREAD_MUTEX_INITIALIZER;
#define cache_lock() pthread_mutex_lock(&cache_mutex)
#define cache_unlock() pthread_mutex_unlock(&cache_mutex)
static pthread_mutex_t progress_mutex = PTHREAD_MUTEX_INITIALIZER;
#define progress_lock() pthread_mutex_lock(&progress_mutex)
#define progress_unlock() pthread_mutex_unlock(&progress_mutex)
@ -1309,6 +1313,8 @@ static pthread_mutex_t progress_mutex = PTHREAD_MUTEX_INITIALIZER;
#define read_lock() 0
#define read_unlock() 0
#define cache_lock() 0
#define cache_unlock() 0
#define progress_lock() 0
#define progress_unlock() 0
@ -1423,17 +1429,27 @@ static int try_delta(struct unpacked *trg, struct unpacked *src,
trg_entry->delta_size = delta_size;
trg->depth = src->depth + 1;
/*
* Handle memory allocation outside of the cache
* accounting lock. Compiler will optimize the strangeness
* away when THREADED_DELTA_SEARCH is not defined.
*/
if (trg_entry->delta_data)
free(trg_entry->delta_data);
cache_lock();
if (trg_entry->delta_data) {
delta_cache_size -= trg_entry->delta_size;
free(trg_entry->delta_data);
trg_entry->delta_data = NULL;
}
if (delta_cacheable(src_size, trg_size, delta_size)) {
trg_entry->delta_data = xrealloc(delta_buf, delta_size);
delta_cache_size += trg_entry->delta_size;
} else
cache_unlock();
trg_entry->delta_data = xrealloc(delta_buf, delta_size);
} else {
cache_unlock();
free(delta_buf);
}
return 1;
}