visual c++ - Using static boolean vs. critical section for concurrency -


So I am preparing a new software interface for a USB HID device and I have a question about concurrency protection is. I think I have to add compatibility security to call ReadFile and WriteFile (Please make me wrong if it can be told from different threads of my design)

In the past, To apply the static booleans are used, until 1 boom adds a loop, as long as the bool did not indicate that the code was safe to enter. I have also used the Critical Section. Can anyone tell me that Critical Section is basically better with the use of Stable Bull, I know that I do not have a waiting loop code, but what is the polling for lock status? Rate Use in VC ++? Are they accustomed to the OS in some way so that they can be made better? Is using a boole not always safe to check a confluence? e.t.c.

I do not know much about C ++, but the association is usually not is implemented by voting, and generally the polling waste processor should not waste time and energy.

  • Blocking on one lock, probably from time to time.

  • Lock-free primitive, most likely or comparison-and-set or comparison-and-swap

    These approaches are supported by both specific modern hardware. They move towards very different "flavors" of interaction. Writing of a lockless data structure is best left to the experts (they are complex, and, more importantly, it is difficult to see if they are right and whether they guarantee the progress in the face of the dispute. ? Details usually accompany the pages of evidence) Fortunately, you can get library of them, and they should be behaved faster and better than blocking them in many people Received, but not in all cases.

    • Comments

    Post a Comment

    Popular posts from this blog

    Java - Error: no suitable method found for add(int, java.lang.String) -

    I'm in the middle of homework work and I'm stuck. At this point in my code, I think that I should have a GUI window that opens and allows me to type "inserted text number". Notice is not going anywhere but at this point, If I pass through the problem then it will be in a linked list. I am getting two of the same error for the lines. Add (index, element); And I can not seem to get past it, there is no suitable method for the error "add (int, java. string string)". Code is below, please advise. To clarify - this will not be a method error because it is a linked list. There should not be any way involved. import java.awt. *; Import java.awt.event. *; Import javax.swing. *; Import java.util. *; Import java.util.Scanner; Import java.util.LinkedList; Public class TopTenList JFrame {Private TopTenList tt; See the Private JTextArea list; Private JTextField cmdTextField; Private JTextField resultsTestfield; // This GUI window is the code for the public toptist...
    Read more

    c# - passing input text from view to contoller with FacebookContext using Facebook app -

    I'm trying to pass an input text from the viewer to the controller in the Facebook Birthday app: Link to app: In the Home Controller [FacebookAuthorize ("email", "user_photos")] Public async Tasks & lt; ActionResult & gt; Index (FacebookContext reference) {if (ModelState.IsValid) {var user = waiting for reference. Client.Gate CurrentUserAsync & lt; MyAppUser & gt; (); View return (user); } See Return ("Error"); } [Http post] [facebook authorized ("email", "user_photo")) public async task & lieutenant; Actionsclass & gt; Index (string textile, facebookcontonte context) {if (ModelState.IsValid) {var user = wait context.Client.GetCurrentUserAsync & lt; MyAppUser & gt; (); // See my code, see the use of txt here (user); } See Return ("Error"); } View: @using facebookpostc.models @ Microsoft.AspNet.Mvc.Facebook.models using @ Microsoft.AspNet.Mvc. Facebook @model MyAppUser @ {ViewB...
    Read more

    Calling a C++ function from C# by passing a string with variable size to it -

    I am calling a string with a C + code and calling from the C # code. The C ++ function is responsible for filling the string material. The following code is: C #party: var abc = new string builder (4096); // will have to change this var result = Basic methods. SignCrcFile (ABC); C ++: bool __cdecl SignCrcFile (char * abc) {... char * tempStr = "hello all"; // for example // copy it to ABC string strcpy (ABC, tempStr); Back true; } The problem is that tempStr's size in the C ++ function is dynamic (the above assignment for TempStr is only an example). In such a case, it is not a hard code that the size of ABC string is in the size of 4096 bytes on the C #. The first solution can be a solution to create 2 functions on the C ++ side to get the size of the string. Then allocate that size using StringBuilder in the C # side then use the next function to bring the entire string from C ++ to the C #. But no suggestion this may not be the most optimal way? ...
    Read more