Fix a deadlock when GCing during a linda operation.

See issue #73.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/keeper.c b/src/keeper.c
index 9affbdf..418b5fb 100644
--- a/src/keeper.c
+++ b/src/keeper.c
@@ -599,7 +599,9 @@ char const* init_keepers( lua_State* L)
                 lua_rawset( K, LUA_REGISTRYINDEX);
 
                 STACK_END( K, 0);
-                MUTEX_INIT( &GKeepers[i].lock_);
+                // we can trigger a GC from inside keeper_call(), where a keeper is acquired
+                // from there, GC can collect a linda, which would acquire the keeper again, and deadlock the thread.
+                MUTEX_RECURSIVE_INIT( &GKeepers[i].lock_);
                 GKeepers[i].L = K;
         }
 #if HAVE_KEEPER_ATEXIT_DESINIT