※ 引述《cckh ()》之铭言： : Hi everyone: : I got a question about interrupting a running program on server. : The following might be a little bit lengthy, I do appreciate your patience : reading this article and provide your ideas to help me resolve this problem. : Here is program description: : in a .html file I used ajax to launch a program on server : the url is like ajaxPath = "Run.jsp"; (appended with other parameters) : and in Run.jsp it contains something like : //=========================================== : String StopFileName = TogetRealPath + "/StopOpt.txt"; : File f1 = new File(application.getRealPath(StopFileName)); : boolean success = f1.delete(); : ... : ... : Optimizer optimizer = new Optimizer(); : String CurPath = application.getRealPath(TogetRealPath); : PageResults = optimizer.RunOpt(CurPath); : On top of Run.jsp it has <%@page import= "CppOptClass.Optimizer"%> : //======================================================== : This part works fine. : Here is how Stop.txt is generated: : in the same .html file I used another ajax function : with url as ajaxPath = "Stop.jsp"; (appended with other parameters) : What Stop.jsp does is the following: : BufferedWriter brw = null; : String CurUserName = request.getParameter("UserName"); : String TogetRealPath = "ProjectFolder/" + CurUserName; : String CurFileName = TogetRealPath + "/StopOpt.txt"; : brw = new BufferedWriter(new FileWriter(application.getRealPath(CurFileName))); : brw.write("Optimization is manually interrupted.\n"); : brw.close(); : Hence it generatea Stop.txt with single-line content. : and in RunOpt(String path) (member function of optimizer) : it will check periodically (every one second) if Stop.txt is there with : corresponding content. If yes, it will use "exit(-1)" to terminate. : (RunOpt(String path) is in fact implemented in C++ and hence connected by JNI) : Here is where the program is encountered: : What happened is that after launching Run.jsp, and I launched Stop.jsp. Stop.txt : is generated successfully, and RunOpt() can be : terminated successfully too. But this only works sometimes. : What happened is that sometimes I saw Stop.txt is generated, but then it got : deleted, and the RunOpt() continues to run!!!!!! In fact, based on the progress : trace, RunOpt() is not resumed, it is re-launched. That's why Stop.txt got ^^^^^^^^^^^ I guess "re-launched" is the most critical hint to solve the problem. Then, let's discover more information now. Are there any loop-structures outside of your program? Try to trace how your program is triggered and managed. To know that, the next question is: what's your server running this program? If it is open-source, please download it and trace the progress more widely again. : deleted. : But how could this possible?!?! : Again, I do appreciate your time and patience reading this article, and : I am looking forward to get response from you. Thank you very much. : C. H. Chen H45 --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 122.117.172.148