On Jun 25, 2014, at 11:26 PM, Daurnimator <quae@daurnimator.com> wrote:
Today I was reading the lua source, and came across this code in lmem.c ( http://www.lua.org/source/5.2/lmem.c.html#luaM_realloc_ )
if (g->gcrunning) {
luaC_fullgc(L, 1); /* try to free some memory... */
Is that conditional accidentally reversed?
Why run the gc again ONLY if the gc is mid-run?
Wouldn't it make sense to run the gc if it's NOT already running?
Sorry if this is a stupid question >.<
Daurn.
If the realloc routine fails to allocate memory, and the garbage collector is running, then it will attempt to do a full garbage collection cycle (in emergency mode) in the effort to free memory.
The allocation is then tried again, and if it fails a memory error is thrown. If the garbage collector is not active then this emergency collection will not occur.
Note that the `g->gcrunning` flag only indicates if the garbage collector is running, not if it is in the middle of a run or any other status other than active or inactive.
~pmd