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runtime: improve mstart comments

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Some of the comments were unclear or outdated.

Change-Id: I02e01bf60def0074c1fa760e94aa992e9e4969b9
Reviewed-on: https://go-review.googlesource.com/c/go/+/172987
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
Austin Clements 2019-04-19 15:56:37 -04:00
parent fe1afe8d4c
commit 744fcfec4e
1 changed files with 5 additions and 3 deletions
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8
src/runtime/proc.go
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@ -1125,7 +1125,7 @@ func startTheWorldWithSema(emitTraceEvent bool) int64 {
return startTime return startTime
} }
// Called to start an M. // mstart is the entry-point for new Ms.
// //
// This must not split the stack because we may not even have stack // This must not split the stack because we may not even have stack
// bounds set up yet. // bounds set up yet.
@ -1150,9 +1150,11 @@ func mstart() {
_g_.stack.hi = uintptr(noescape(unsafe.Pointer(&size))) _g_.stack.hi = uintptr(noescape(unsafe.Pointer(&size)))
_g_.stack.lo = _g_.stack.hi - size + 1024 _g_.stack.lo = _g_.stack.hi - size + 1024
} }
// Initialize stack guards so that we can start calling // Initialize stack guard so that we can start calling regular
// both Go and C functions with stack growth prologues. // Go code.
_g_.stackguard0 = _g_.stack.lo + _StackGuard _g_.stackguard0 = _g_.stack.lo + _StackGuard
// This is the g0, so we can also call go:systemstack
// functions, which check stackguard1.
_g_.stackguard1 = _g_.stackguard0 _g_.stackguard1 = _g_.stackguard0
mstart1() mstart1()