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int lua_gc (lua_State *L, int what, int data);
Controls the garbage collector.
This function performs several tasks,
according to the value of the parameter what :
LUA_GCSTOP :
stops the garbage collector.
LUA_GCRESTART :
restarts the garbage collector.
LUA_GCCOLLECT :
performs a full garbage-collection cycle.
LUA_GCCOUNT :
returns the current amount of memory (in Kbytes) in use by Lua.
LUA_GCCOUNTB :
returns the remainder of dividing the current amount of bytes of
memory in use by Lua by 1024.
LUA_GCSTEP :
performs an incremental step of garbage collection.
The step "size" is controlled by data
(larger values mean more steps) in a non-specified way.
If you want to control the step size
you must experimentally tune the value of data .
The function returns 1 if the step finished a
garbage-collection cycle.
LUA_GCSETPAUSE :
sets data as the new value
for the pause of the collector (see §2.10).
The function returns the previous value of the pause.
LUA_GCSETSTEPMUL :
sets data as the new value for the step multiplier of
the collector (see §2.10).
The function returns the previous value of the step multiplier.
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