[dev.garbage] all: merge dev.cc into dev.garbage

The garbage collector is now written in Go.
There is plenty to clean up (just like on dev.cc).

all.bash passes on darwin/amd64, darwin/386, linux/amd64, linux/386.

TBR=rlh
R=austin, rlh, bradfitz
CC=golang-codereviews
https://golang.org/cl/173250043

1 files changed, 2 insertions, 16 deletions

diff --git a/src/runtime/debug.go b/src/runtime/debug.go
index 4414dd55d2..105b79cfef 100644
--- a/src/runtime/debug.go
+++ b/src/runtime/debug.go
@@ -6,18 +6,6 @@ package runtime
 
 import "unsafe"
 
-// Breakpoint executes a breakpoint trap.
-func Breakpoint()
-
-// LockOSThread wires the calling goroutine to its current operating system thread.
-// Until the calling goroutine exits or calls UnlockOSThread, it will always
-// execute in that thread, and no other goroutine can.
-func LockOSThread()
-
-// UnlockOSThread unwires the calling goroutine from its fixed operating system thread.
-// If the calling goroutine has not called LockOSThread, UnlockOSThread is a no-op.
-func UnlockOSThread()
-
 // GOMAXPROCS sets the maximum number of CPUs that can be executing
 // simultaneously and returns the previous setting.  If n < 1, it does not
 // change the current setting.
@@ -37,14 +25,14 @@ func GOMAXPROCS(n int) int {
 	semacquire(&worldsema, false)
 	gp := getg()
 	gp.m.gcing = 1
-	onM(stoptheworld)
+	systemstack(stoptheworld)
 
 	// newprocs will be processed by starttheworld
 	newprocs = int32(n)
 
 	gp.m.gcing = 0
 	semrelease(&worldsema)
-	onM(starttheworld)
+	systemstack(starttheworld)
 	return ret
 }
 
@@ -66,5 +54,3 @@ func NumCgoCall() int64 {
 func NumGoroutine() int {
 	return int(gcount())
 }
-
-func gcount() int32