Why cant I WinUsb_ReadPipe data from multiple identical devices in parallel?












1















this is a continuation of a problem I posted before. Here is the link...



Is it possible to use winusb to communicate with multiple identical usb devices simultaneously?



In summary, I have multiple identical devices and I need to continuously read from them in parallel. Firstly, I wrote a code that has each device running on a separate thread. This did not work out. After looking at the time each readpipe was accomplished I saw that they happened one after another. As by the advice, I went and implemented Overlapped structure into my code. However, that did not work either. I came out having the same issue. ( I take time after each read is finished ) After everything I decided to run two separate instances of my program. I took the time from each instances and combined them. After examining I saw that this issue still existed. Hence, I am wondering is this a limitation of winusb.sys itself?



Here is my link to my code...



https://drive.google.com/drive/folders/1qvcGwNLxzJ0oRrFZbtyZ7g0zCU0XUG1n?usp=sharing



Thank you very much, if something is unclear please tell and I will provide more information.










share|improve this question



























    1















    this is a continuation of a problem I posted before. Here is the link...



    Is it possible to use winusb to communicate with multiple identical usb devices simultaneously?



    In summary, I have multiple identical devices and I need to continuously read from them in parallel. Firstly, I wrote a code that has each device running on a separate thread. This did not work out. After looking at the time each readpipe was accomplished I saw that they happened one after another. As by the advice, I went and implemented Overlapped structure into my code. However, that did not work either. I came out having the same issue. ( I take time after each read is finished ) After everything I decided to run two separate instances of my program. I took the time from each instances and combined them. After examining I saw that this issue still existed. Hence, I am wondering is this a limitation of winusb.sys itself?



    Here is my link to my code...



    https://drive.google.com/drive/folders/1qvcGwNLxzJ0oRrFZbtyZ7g0zCU0XUG1n?usp=sharing



    Thank you very much, if something is unclear please tell and I will provide more information.










    share|improve this question

























      1












      1








      1








      this is a continuation of a problem I posted before. Here is the link...



      Is it possible to use winusb to communicate with multiple identical usb devices simultaneously?



      In summary, I have multiple identical devices and I need to continuously read from them in parallel. Firstly, I wrote a code that has each device running on a separate thread. This did not work out. After looking at the time each readpipe was accomplished I saw that they happened one after another. As by the advice, I went and implemented Overlapped structure into my code. However, that did not work either. I came out having the same issue. ( I take time after each read is finished ) After everything I decided to run two separate instances of my program. I took the time from each instances and combined them. After examining I saw that this issue still existed. Hence, I am wondering is this a limitation of winusb.sys itself?



      Here is my link to my code...



      https://drive.google.com/drive/folders/1qvcGwNLxzJ0oRrFZbtyZ7g0zCU0XUG1n?usp=sharing



      Thank you very much, if something is unclear please tell and I will provide more information.










      share|improve this question














      this is a continuation of a problem I posted before. Here is the link...



      Is it possible to use winusb to communicate with multiple identical usb devices simultaneously?



      In summary, I have multiple identical devices and I need to continuously read from them in parallel. Firstly, I wrote a code that has each device running on a separate thread. This did not work out. After looking at the time each readpipe was accomplished I saw that they happened one after another. As by the advice, I went and implemented Overlapped structure into my code. However, that did not work either. I came out having the same issue. ( I take time after each read is finished ) After everything I decided to run two separate instances of my program. I took the time from each instances and combined them. After examining I saw that this issue still existed. Hence, I am wondering is this a limitation of winusb.sys itself?



      Here is my link to my code...



      https://drive.google.com/drive/folders/1qvcGwNLxzJ0oRrFZbtyZ7g0zCU0XUG1n?usp=sharing



      Thank you very much, if something is unclear please tell and I will provide more information.







      c++ winusb






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 13 '18 at 1:29









      aappaapp

      156




      156
























          0






          active

          oldest

          votes











          Your Answer






          StackExchange.ifUsing("editor", function () {
          StackExchange.using("externalEditor", function () {
          StackExchange.using("snippets", function () {
          StackExchange.snippets.init();
          });
          });
          }, "code-snippets");

          StackExchange.ready(function() {
          var channelOptions = {
          tags: "".split(" "),
          id: "1"
          };
          initTagRenderer("".split(" "), "".split(" "), channelOptions);

          StackExchange.using("externalEditor", function() {
          // Have to fire editor after snippets, if snippets enabled
          if (StackExchange.settings.snippets.snippetsEnabled) {
          StackExchange.using("snippets", function() {
          createEditor();
          });
          }
          else {
          createEditor();
          }
          });

          function createEditor() {
          StackExchange.prepareEditor({
          heartbeatType: 'answer',
          autoActivateHeartbeat: false,
          convertImagesToLinks: true,
          noModals: true,
          showLowRepImageUploadWarning: true,
          reputationToPostImages: 10,
          bindNavPrevention: true,
          postfix: "",
          imageUploader: {
          brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
          contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
          allowUrls: true
          },
          onDemand: true,
          discardSelector: ".discard-answer"
          ,immediatelyShowMarkdownHelp:true
          });


          }
          });














          draft saved

          draft discarded


















          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53272471%2fwhy-cant-i-winusb-readpipe-data-from-multiple-identical-devices-in-parallel%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown

























          0






          active

          oldest

          votes








          0






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes
















          draft saved

          draft discarded




















































          Thanks for contributing an answer to Stack Overflow!


          • Please be sure to answer the question. Provide details and share your research!

          But avoid



          • Asking for help, clarification, or responding to other answers.

          • Making statements based on opinion; back them up with references or personal experience.


          To learn more, see our tips on writing great answers.




          draft saved


          draft discarded














          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53272471%2fwhy-cant-i-winusb-readpipe-data-from-multiple-identical-devices-in-parallel%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown





















































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown

































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown







          Popular posts from this blog

          Florida Star v. B. J. F.

          Danny Elfman

          Retrieve a Users Dashboard in Tumblr with R and TumblR. Oauth Issues