diff options
Diffstat (limited to 'ncache.c')
| -rw-r--r-- | ncache.c | 35 |
1 files changed, 21 insertions, 14 deletions
@@ -36,7 +36,11 @@ ncache_t ncache; /*----------------------------------------------------------------------------*/ /*Cache size (may be overwritten by the user)*/ -int ncache_size = NCACHE_SIZE; +/*int ncache_size = NCACHE_SIZE;*/ +/*Our cache is not really a cache now (actually, it has never been one). Its + main task now will be to maintain additional references to shadow nodes, + which are still in use by some clients and which could possibly go away if + nobody maintained references to them explicitly.*/ /*----------------------------------------------------------------------------*/ /*----------------------------------------------------------------------------*/ @@ -45,14 +49,15 @@ int ncache_size = NCACHE_SIZE; void ncache_init ( - int size_max + /*int size_max*/ + void ) { /*Reset the LRU and MRU ends of the list*/ ncache.mru = ncache.lru = NULL; /*Set the maximal size according to the parameter*/ - ncache.size_max = size_max; + /*ncache.size_max = size_max;*/ /*The cache is empty so far; remark that*/ ncache.size_current = 0; @@ -101,8 +106,9 @@ ncache_node_lookup return err; }/*ncache_node_lookup*/ /*----------------------------------------------------------------------------*/ -/*Removes the given node from the cache*/ -static +/*Removes the given node from the cache. Does not release the reference held + by the cache (for some further finalization actions on the node)*/ +/*Nodes will NOT be removed from the cache automatically*/ void ncache_node_remove ( @@ -139,16 +145,17 @@ ncache_node_remove }/*ncache_node_remove*/ /*----------------------------------------------------------------------------*/ /*Resets the node cache*/ +/*No references to nodes are released*/ void ncache_reset(void) { - /*The node being currently deleted*/ + /*The node being currently removed from the cache*/ node_t * node; /*Acquire a lock on the cache*/ mutex_lock(&ncache.lock); - /*Remove the whole cache chain*/ + /*Release the whole cache chain*/ for(node = ncache.mru; node != NULL; ncache_node_remove(node), node = ncache.mru); /*Release the lock*/ @@ -165,8 +172,8 @@ ncache_node_add /*Acquire a lock on the cache*/ mutex_lock(&ncache.lock); - /*If there already are some nodes in the cache and it is enabled*/ - if((ncache.size_max > 0) || (ncache.size_current > 0)) + /*If there already are some nodes in the cache already*/ + if(ncache.size_current > 0) { /*If the node to be added is not at the MRU end already*/ if(ncache.mru != node) @@ -200,20 +207,20 @@ ncache_node_add } /*While the size of the cache is exceeding the maximal size*/ - node_t * old_lru; +/* node_t * old_lru; for ( old_lru = ncache.lru; ncache.size_current > ncache.size_max; old_lru = ncache.lru ) - { + {*/ /*remove the current LRU end of the list from the cache*/ - ncache_node_remove(old_lru); + /*ncache_node_remove(old_lru);*/ /*release the reference to the node owned by this thread*/ - netfs_nrele(old_lru); - } + /*netfs_nrele(old_lru); + }*/ /*Release the lock on the cache*/ mutex_unlock(&ncache.lock); |