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Use new atomic_fetchadd() primitive instead of looping atomic_cmpset().

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This commit is contained in:
Alexander Motin 2008-03-30 00:27:48 +00:00
parent 5634d48667
commit 018fe3d10e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=177728
1 changed files with 5 additions and 8 deletions
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13
sys/netgraph/ng_base.c
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@ -770,11 +770,9 @@ ng_unref_node(node_p node)
return (0);
}
do {
v = node->nd_refs - 1;
} while (! atomic_cmpset_int(&node->nd_refs, v + 1, v));
v = atomic_fetchadd_int(&node->nd_refs, -1);
if (v == 0) { /* we were the last */
if (v == 1) { /* we were the last */
mtx_lock(&ng_namehash_mtx);
node->nd_type->refs--; /* XXX maybe should get types lock? */
@ -788,7 +786,7 @@ ng_unref_node(node_p node)
mtx_destroy(&node->nd_input_queue.q_mtx);
NG_FREE_NODE(node);
}
return (v);
return (v - 1);
}
/************************************************************************
@ -959,9 +957,8 @@ ng_unref_hook(hook_p hook)
if (hook == &ng_deadhook) {
return;
}
do {
v = hook->hk_refs;
} while (! atomic_cmpset_int(&hook->hk_refs, v, v - 1));
v = atomic_fetchadd_int(&hook->hk_refs, -1);
if (v == 1) { /* we were the last */
if (_NG_HOOK_NODE(hook)) /* it'll probably be ng_deadnode */