threaded delta search: proper locking for cache accounting
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin-pack-objects.c b/builtin-pack-objects.c
index e091bcb..b126fc8 100644
--- a/builtin-pack-objects.c
+++ b/builtin-pack-objects.c
@@ -1301,6 +1301,10 @@
#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 @@
#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 @@
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;
}
