MINOR: pools: export the pools variable

We want it to be accessible from debuggers for inspection and it's
currently unavailable. Let's start by exporting it as a first step.

Author: wtarreau

include/haproxy/pool.h

@@ -106,6 +106,9 @@ extern int pool_trim_in_progress;
 /* set of POOL_DBG_* flags */
 extern uint pool_debugging;
 
+/* pools are listed here */
+extern struct list pools;
+
 int malloc_trim(size_t pad);
 void trim_all_pools(void);
 

src/pool.c

@@ -36,7 +36,7 @@
 THREAD_LOCAL size_t pool_cache_bytes = 0;                /* total cache size */
 THREAD_LOCAL size_t pool_cache_count = 0;                /* #cache objects   */
 
-static struct list pools __read_mostly = LIST_HEAD_INIT(pools);
+struct list pools __read_mostly = LIST_HEAD_INIT(pools);
 int mem_poison_byte __read_mostly = 'P';
 int pool_trim_in_progress = 0;
 uint pool_debugging __read_mostly =               /* set of POOL_DBG_* flags */