threading.nim

# MIT License
# 
# Copyright (c) 2023 Can Joshua Lehmann
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
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# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
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# 
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# SOFTWARE.

import std/os
import owlkettle

viewable App:
  count: int

when compileOption("threads"):
  var thread: Thread[AppState]

proc threadProc(app: AppState) {.thread.} =
  while true:
    app.count += 1
    app.redrawFromThread()
    sleep(1000)

method view(app: AppState): Widget =
  result = gui:
    Window:
      title = "Threading Example"
      defaultSize = (300, 100)
      
      Box:
        orient = OrientX
        margin = 12
        spacing = 6
        
        Button:
          text = "Start Thread"
          
          proc clicked() =
            when compileOption("threads"):
              createThread(thread, threadProc, app)
        
        Label:
          text = $app.count

when compileOption("threads") and (defined(gcOrc) or defined(gcArc)):
  brew(gui(App()))
else:
  quit "Compile with --threads:on and --gc:orc to enable threads"