停止/殺死連續線程

Question

我在繪制輸入數據時試圖連續運行同時控制步進電機的功能。 我可以運行該功能，但是當我嘗試通過鍵盤中斷將其停止時，線程無法識別它。

這是代碼：

              def forward():
               global delay
               while True:
                try:
                 cor = (-2.3*readadc(cor_adc)) + 1841
                 target = readadc(target_adc)
                 deltaP = target - cor
                 deltaP_list.append(deltaP)
                 if math.fabs((deltaP_list[-1] - deltaP_list[-2])) >= 10:
                  delay=(-.125628140704*math.fabs(deltaP)) + 30.1256281407
                 if delay < 5:
                  delay=5
                 print "delay", delay
                 print "diff", math.fabs((deltaP_list[-1] - deltaP_list[-2]))
                 print "Delta P", math.fabs(deltaP)
                 for i in range(0, int(50)):
                  setStep(1, 0, 0, 0)
                  time.sleep(int(delay) / 1000.0)
                  setStep(1, 1, 0, 0)
                  time.sleep(int(delay) / 1000.0)
                  setStep(0, 1, 0, 0)
                  time.sleep(int(delay) / 1000.0)
                  setStep(0, 1, 1, 0)
                  time.sleep(int(delay) / 1000.0)
                  setStep(0, 0, 1, 0)
                  time.sleep(int(delay) / 1000.0)
                  setStep(0, 0, 1, 1)
                  time.sleep(int(delay) / 1000.0)
                  setStep(0, 0, 0, 1)
                  time.sleep(int(delay) / 1000.0)
                  setStep(1, 0, 0, 1)
                  time.sleep(int(delay) / 1000.0)
                except KeyboardInterrupt:
                  print('end')
                  break
            Thread(target=forward).start()
            xAchse=pylab.arange(0,50,1)
            yAchse=pylab.array([0]*50)
            fig = pylab.figure(1)
            ax = fig.add_subplot(111)
            ax.grid(True)
            ax.set_title("Linear Algorithm")
            ax.set_xlabel("Time")
            ax.set_ylabel("mmHg")
            ax.axis([0,50,0,300])
            line1=ax.plot(xAchse,yAchse,'-')
            line2=ax.plot(xAchse,yAchse,'-')
            manager = pylab.get_current_fig_manager()

            def build_plot(arg):
              cor = (-2.3*readadc(cor_adc)) + 1841
              target = readadc(target_adc)
              cor_list.append(cor)
              target_list.append(target)
            def RealtimePloter(arg):
              CurrentXAxis=pylab.arange(0,50,1)
              line1[0].set_data(CurrentXAxis,pylab.array(cor_list[-50:]))
              line2[0].set_data(CurrentXAxis,pylab.array(target_list[-50:]))
              ax.axis([CurrentXAxis.min(),CurrentXAxis.max(),0, 300])
              manager.canvas.draw()
              #manager.show()
            timer = fig.canvas.new_timer(interval=1)
            timer.add_callback(RealtimePloter, ())
            timer2 = fig.canvas.new_timer(interval=1)
            timer2.add_callback(build_plot, ())               
            timer.start()
            timer2.start()
            pylab.show()

Answer 1

沒時間了！

我相信您的線程實例不監聽interrupt的原因是因為它非常忙於運行forward()方法！

嘗試查看是否追加：

import time #somewhere in your code
time.sleep(0)

在方法結束時，將使線程進行監聽！ “休眠”零秒等於檢查信號。

進一步了解