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Found a better solution for implementing ieee80211_node_dectestref().

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Now the reference count get accessed only once, leading to true atomarity.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34823 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Colin Günther
2009-12-30 01:00:51 +00:00
parent 210124c810
commit 485da29cbc
1 changed files with 2 additions and 5 deletions
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src/libs/compat/freebsd_wlan/net80211/ieee80211_haiku.c
+2 -5
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@@ -397,8 +397,6 @@ ieee80211_getmgtframe(uint8_t** frm, int headroom, int pktlen)
/* /*
* Decrements the reference-counter and * Decrements the reference-counter and
* tests whether it became zero. * tests whether it became zero.
* NB: The negation of atomic_add is not atomar. Must work until sth. better is
* found.
* *
* @return 1 reference-counter became zero * @return 1 reference-counter became zero
* @return 0 reference-counter didn't became zero * @return 0 reference-counter didn't became zero
@@ -406,9 +404,8 @@ ieee80211_getmgtframe(uint8_t** frm, int headroom, int pktlen)
int int
ieee80211_node_dectestref(struct ieee80211_node* ni) ieee80211_node_dectestref(struct ieee80211_node* ni)
{ {
// XXX need equivalent of atomic_dec_and_test // atomic_add returns old value
atomic_add((vint32*)&ni->ni_refcnt, -1); return 1 == atomic_add((vint32*)&ni->ni_refcnt, -1);
return !atomic_add((vint32*)&ni->ni_refcnt, 0);
} }