runtime: move mainExited boolean

This variable is only necessary on the cooperative scheduler. It is not
actually used on the "none" scheduler, so can be removed there.

Author: aykevl

src/runtime/scheduler.go

@@ -4,8 +4,6 @@ import "internal/task"
 
 const schedulerDebug = false
 
-var mainExited bool
-
 var timerQueue *timerNode
 
 // Simple logging, for debugging.

src/runtime/scheduler_cooperative.go

@@ -27,6 +27,8 @@ const hasScheduler = true
 // concurrency, it does not have parallelism.
 const hasParallelism = false
 
+var mainExited bool
+
 // Queues used by the scheduler.
 var (
 	runqueue           task.Queue

src/runtime/scheduler_none.go

@@ -16,7 +16,6 @@ func run() {
 	initRand()
 	initAll()
 	callMain()
-	mainExited = true
 }
 
 //go:linkname sleep time.Sleep