very deep recursion in 5.1 GC
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- Subject: very deep recursion in 5.1 GC
- From: "Jasmin Patry" <jpatry@...>
- Date: 2004年7月27日 19:44:58 -0700
We've encountered a situation in which we get extremely deep recursion
in the Lua 5.1 GC. The problem occurs when collection userdata objects
with __gc metamethods definied:
* singlestep calls GCTM
* GCTM calls luaD_call
* luaD_call calls luaC_checkGC
* luaC_checkGC calls singlestep
...ad infinitum (almost)
I've fixed this by disabling the garbage collector during the call to
GCTM, by applying this patch to singlestep() in lgc.c:
@@ -594,7 +594,10 @@
}
case GCSfinalize: {
if (g->tmudata) {
+ lu_mem thresh = g->GCthreshold;
+ g->GCthreshold = MAXLMEM;
GCTM(L);
+ g->GCthreshold = thresh;
lim -= GCFINALIZECOST;
}
This seems to fix the problem. If this is an incorrect fix, or if there
is a better fix, please let me know.
Thanks,
Jasmin