Hello, I have a question about the bottom of the goroutine

[王晚成]

hello ，

         I have a question about the bottom of the goroutine.

        What is the meaning of the mstartfn field inside the M structure under runtime2.go?

        Is this mstartfn the function that we write behind the go statement?

        Or what other functions?

        Thanks very much!

[Ian Lance Taylor]

mstartfn is used to start a few special purpose functions on a new M.
Specifically, in current master, the possible values are sysmon (the
system monitor thread), mhelpgc (a new thread ready to help the GC in
the future), and mspinning (starts the new thread in spinning state to
maintain some bookkeeping).

Ian