bug in 5.0
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- Subject: bug in 5.0
- From: Roberto Ierusalimschy <roberto@...>
- Date: 2006年1月02日 16:52:10 -0200
There seems to be a stupid bug in the collection of weak tables in Lua
5.0.2. Once a weak table survives a garbage collection, it is never
collected. A simple example is like this:
a = {}
print(gcinfo())
for i = 1, 10000 do
a[i] = setmetatable({}, {__mode = "v"})
end
collectgarbage()
a = nil
collectgarbage()
print(gcinfo()) -- should be near the first value...
The patch is a single line in lgc.c:
@@ -366,7 +366,7 @@
GCObject *curr;
int count = 0; /* number of collected items */
while ((curr = *p) != NULL) {
- if (curr->gch.marked > limit) {
+ if ((curr->gch.marked & ~(KEYWEAK | VALUEWEAK)) > limit) {
unmark(curr);
p = &curr->gch.next;
}
(Bug reported by Chromix.)
As far as we checked, this bug is not present in Lua 5.1 beta.
-- Roberto