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Fix terminal state and key state data races #335

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merged 3 commits into from
May 10, 2022
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ernestrc
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@ernestrc ernestrc commented May 9, 2022

I am using darktile for an internal project and stumbled upon a few data races. In essence, we are processing input via io.Copy->Terminal.Write->handleInput concurrently without synchronizing with the main rendering loop (GUI.Update->...->g.terminal.GetActiveBuffer).

I haven't done any analysis on contention but at first glance we might be adding some, since we are blocking on internal calls to WriteToPty etc. This solution was enough for my purposes so feel free to close PR if you think a more sophisticated approach is required.

go run -race cmd/darktile/main.go

WARNING: DATA RACE
Write at 0x00c000864128 by goroutine 23:
	github.com/liamg/darktile/internal/app/darktile/termutil.(*Terminal).sgrSequenceHandler()
	/home/ernestrc/src/darktile/internal/app/darktile/termutil/csi.go:973 +0x12ca
	github.com/liamg/darktile/internal/app/darktile/termutil.(*Terminal).handleCSI()
	/home/ernestrc/src/darktile/internal/app/darktile/termutil/csi.go:62 +0x7e8
	github.com/liamg/darktile/internal/app/darktile/termutil.(*Terminal).handleANSI()
	/home/ernestrc/src/darktile/internal/app/darktile/termutil/ansi.go:11 +0xc86
	github.com/liamg/darktile/internal/app/darktile/termutil.(*Terminal).process()
	/home/ernestrc/src/darktile/internal/app/darktile/termutil/terminal.go:206 +0x126
	github.com/liamg/darktile/internal/app/darktile/termutil.(*Terminal).Run·dwrap·10()
	/home/ernestrc/src/darktile/internal/app/darktile/termutil/terminal.go:171 +0x39
Previous read at 0x00c000864128 by goroutine 22:
	[failed to restore the stack]
Goroutine 23 (running) created at:
	github.com/liamg/darktile/internal/app/darktile/termutil.(*Terminal).Run()
	/home/ernestrc/src/darktile/internal/app/darktile/termutil/terminal.go:171 +0x517
	github.com/liamg/darktile/internal/app/darktile/gui.(*GUI).Run.func1()
	/home/ernestrc/src/darktile/internal/app/darktile/gui/gui.go:80 +0xa
Goroutine 22 (running) created at:
	github.com/hajimehoshi/ebiten/v2/internal/uidriver/glfw.(*UserInterface).Run()
	/home/ernestrc/src/darktile/vendor/github.com/hajimehoshi/ebiten/v2/internal/uidriver/glfw/run_notsinglethread.go:37 +0x2c4
	github.com/hajimehoshi/ebiten/v2.RunGame()
	/home/ernestrc/src/darktile/vendor/github.com/hajimehoshi/ebiten/v2/run.go:158 +0x1d4
	github.com/liamg/darktile/internal/app/darktile/gui.(*GUI).Run()
	/home/ernestrc/src/darktile/internal/app/darktile/gui/gui.go:99 +0x2de
	github.com/liamg/darktile/internal/app/darktile/cmd.glob..func2()
	/home/ernestrc/src/darktile/internal/app/darktile/cmd/root.go:130 +0x13a9
	github.com/spf13/cobra.(*Command).execute()
	/home/ernestrc/src/darktile/vendor/github.com/spf13/cobra/command.go:852 +0xa7d
	github.com/spf13/cobra.(*Command).ExecuteC()
	/home/ernestrc/src/darktile/vendor/github.com/spf13/cobra/command.go:960 +0x5da
	github.com/spf13/cobra.(*Command).Execute()
	/home/ernestrc/src/darktile/vendor/github.com/spf13/cobra/command.go:897 +0x366
	github.com/liamg/darktile/internal/app/darktile/cmd.Execute()
	/home/ernestrc/src/darktile/internal/app/darktile/cmd/root.go:153 +0x34f
	main.main()
	/home/ernestrc/src/darktile/cmd/darktile/main.go:75 +0x24
==================
Found 26 data race(s)
go run -race cmd/darktile/main.go

WARNING: DATA RACE
Write at 0x00c00009fbc0 by goroutine 20:
	runtime.mapdelete_fast64()
	/usr/lib/go/src/runtime/map_fast64.go:272 +0x0
	github.com/liamg/darktile/internal/app/darktile/gui.(*keyState).RepeatPressed()
	/home/ernestrc/src/darktile/internal/app/darktile/gui/key_states.go:61 +0x428
	github.com/liamg/darktile/internal/app/darktile/gui.(*GUI).handleInput()
	/home/ernestrc/src/darktile/internal/app/darktile/gui/input.go:109 +0x224
	github.com/liamg/darktile/internal/app/darktile/gui.(*GUI).Update()
	/home/ernestrc/src/darktile/internal/app/darktile/gui/update.go:34 +0x2e
	github.com/hajimehoshi/ebiten/v2.(*imageDumper).update()
	/home/ernestrc/src/darktile/vendor/github.com/hajimehoshi/ebiten/v2/imagedumper_desktop.go:111 +0x85
	github.com/hajimehoshi/ebiten/v2.(*imageDumperGame).Update()
	/home/ernestrc/src/darktile/vendor/github.com/hajimehoshi/ebiten/v2/run.go:115 +0x172
	github.com/hajimehoshi/ebiten/v2.(*uiContext).updateImpl()
	/home/ernestrc/src/darktile/vendor/github.com/hajimehoshi/ebiten/v2/uicontext.go:194 +0x12c
	github.com/hajimehoshi/ebiten/v2.(*uiContext).update()
	/home/ernestrc/src/darktile/vendor/github.com/hajimehoshi/ebiten/v2/uicontext.go:166 +0x88
	github.com/hajimehoshi/ebiten/v2.(*uiContext).Update()
	/home/ernestrc/src/darktile/vendor/github.com/hajimehoshi/ebiten/v2/uicontext.go:147 +0x3b
	github.com/hajimehoshi/ebiten/v2/internal/uidriver/glfw.(*UserInterface).loop()
	/home/ernestrc/src/darktile/vendor/github.com/hajimehoshi/ebiten/v2/internal/uidriver/glfw/ui.go:1036 +0x401
	github.com/hajimehoshi/ebiten/v2/internal/uidriver/glfw.(*UserInterface).Run.func1()
	/home/ernestrc/src/darktile/vendor/github.com/hajimehoshi/ebiten/v2/internal/uidriver/glfw/run_notsinglethread.go:53 +0x1b1
Previous read at 0x00c00009fbc0 by goroutine 19:
	github.com/liamg/darktile/internal/app/darktile/gui.(*keyState).AnythingPressed()
	/home/ernestrc/src/darktile/internal/app/darktile/gui/key_states.go:33 +0xbc
	github.com/liamg/darktile/internal/app/darktile/gui.(*GUI).watchForUpdate()
	/home/ernestrc/src/darktile/internal/app/darktile/gui/gui.go:105 +0x77
	github.com/liamg/darktile/internal/app/darktile/gui.(*GUI).Run·dwrap·2()
	/home/ernestrc/src/darktile/internal/app/darktile/gui/gui.go:97 +0x39
Goroutine 20 (running) created at:
	github.com/hajimehoshi/ebiten/v2/internal/uidriver/glfw.(*UserInterface).Run()
	/home/ernestrc/src/darktile/vendor/github.com/hajimehoshi/ebiten/v2/internal/uidriver/glfw/run_notsinglethread.go:37 +0x2c4
	github.com/hajimehoshi/ebiten/v2.RunGame()
Goroutine 19 (running) created at:
	github.com/liamg/darktile/internal/app/darktile/gui.(*GUI).Run()
	/home/ernestrc/src/darktile/internal/app/darktile/gui/gui.go:97 +0x2ca
	github.com/liamg/darktile/internal/app/darktile/cmd.glob..func2()
	/home/ernestrc/src/darktile/internal/app/darktile/cmd/root.go:130 +0x13a9
	github.com/spf13/cobra.(*Command).execute()
	/home/ernestrc/src/darktile/vendor/github.com/spf13/cobra/command.go:852 +0xa7d
	github.com/spf13/cobra.(*Command).ExecuteC()
	/home/ernestrc/src/darktile/vendor/github.com/spf13/cobra/command.go:960 +0x5da
	github.com/spf13/cobra.(*Command).Execute()
	/home/ernestrc/src/darktile/vendor/github.com/spf13/cobra/command.go:897 +0x366
	github.com/liamg/darktile/internal/app/darktile/cmd.Execute()
	/home/ernestrc/src/darktile/internal/app/darktile/cmd/root.go:153 +0x34f
	main.main()
	/home/ernestrc/src/darktile/cmd/darktile/main.go:75 +0x24
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Looks great, thank you! 🚀

@liamg liamg merged commit 93392fc into liamg:main May 10, 2022
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