python read/write work flow

[NeonZhou]

Firstly thank you for your contributions!
I am wondering where can I find the work flow of python read/write the sharedMemory, like how python do changes to the version and nextVersion variables and so on.
/**/
while not c.rl.isFinish():
with c.rl as data:
if data == None:
break
data.act = c.do(data.env, data.act)
pass
//
where can i find the impliciting code under this segment?
Thanks a lot !