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[dev.garbage] all: merge dev.cc (81884b89bd88) into dev.garbage

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TBR=rlh
CC=golang-codereviews
https://golang.org/cl/181100044
This commit is contained in:
Russ Cox 2014-12-05 11:40:41 -05:00
commit 444839014b
30 changed files with 1450 additions and 153 deletions
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14
src/runtime/stack1.go
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@ -718,9 +718,7 @@ func newstack() {
gothrow("stack overflow")
}
oldstatus := readgstatus(gp)
oldstatus &^= _Gscan
casgstatus(gp, oldstatus, _Gcopystack) // oldstatus is Gwaiting or Grunnable
casgstatus(gp, _Gwaiting, _Gcopystack)
// The concurrent GC will not scan the stack while we are doing the copy since
// the gp is in a Gcopystack status.
@ -789,15 +787,7 @@ func shrinkstack(gp *g) {
print("shrinking stack ", oldsize, "->", newsize, "\n")
}
// This is being done in a Gscan state and was initiated by the GC so no need to move to
// the Gcopystate.
// The world is stopped, so the goroutine must be Gwaiting or Grunnable,
// and what it is is not changing underfoot.
oldstatus := readgstatus(gp) &^ _Gscan
if oldstatus != _Gwaiting && oldstatus != _Grunnable {
gothrow("status is not Gwaiting or Grunnable")
}
casgstatus(gp, oldstatus, _Gcopystack)
oldstatus := casgcopystack(gp)
copystack(gp, newsize)
casgstatus(gp, _Gcopystack, oldstatus)
}