Producer/Consumer : 1 producer, multiple consumers - 1 semaphore, 1 mutex, 1 conditional variable












-1















I'm implementing the Producer/Consumer problem in C with some specific criteria:




  1. 1 producer, multiple consumers

  2. using only one mutex, one semaphore, one conditional variable

  3. All consumers have to consume (like a broadcast), and then, when all that producer have produced is already consumed by consumers, producer will produce more.


I don't know how to implement it using only what I should according to criteria above.



Here is the pseudo code I've wrote using 3 mutexes only and I can't do it according to criteria.



Any help will be appreciated, I have no idea how to use here just one mutex, where to put semaphore and conditional variable.




Pseudo code:



WRITER:



glock();  //lock from reader



write_lock(); //wait till there is no readers



//write the data



write_unlock();



g_unlock();


READER:



g_lock();  //so reader can't read when writer locked g and writting

g_unlock();



read_lock();

reader++;

if (reader == 1)

    write_lock();   ///all consumers have consume 



//read the data



read_lock();

reader--;

if (reader == 0)

    write_unlock();

read_lock();






c producer-consumer







share|improve this question





























    -1















    I'm implementing the Producer/Consumer problem in C with some specific criteria:




    1. 1 producer, multiple consumers

    2. using only one mutex, one semaphore, one conditional variable

    3. All consumers have to consume (like a broadcast), and then, when all that producer have produced is already consumed by consumers, producer will produce more.


    I don't know how to implement it using only what I should according to criteria above.



    Here is the pseudo code I've wrote using 3 mutexes only and I can't do it according to criteria.



    Any help will be appreciated, I have no idea how to use here just one mutex, where to put semaphore and conditional variable.




    Pseudo code:



    WRITER:



    glock();  //lock from reader
    

    
write_lock(); //wait till there is no readers
    

    
//write the data
    

    
write_unlock();
    

    
g_unlock();


    READER:



    g_lock();  //so reader can't read when writer locked g and writting
    
g_unlock();
    

    
read_lock();
    
reader++;
    
if (reader == 1)
    
    write_lock();   ///all consumers have consume 
    

    
//read the data
    

    
read_lock();
    
reader--;
    
if (reader == 0)
    
    write_unlock();
    
read_lock();






    c producer-consumer







    share|improve this question



























      -1












      -1








      -1








      I'm implementing the Producer/Consumer problem in C with some specific criteria:




      1. 1 producer, multiple consumers

      2. using only one mutex, one semaphore, one conditional variable

      3. All consumers have to consume (like a broadcast), and then, when all that producer have produced is already consumed by consumers, producer will produce more.


      I don't know how to implement it using only what I should according to criteria above.



      Here is the pseudo code I've wrote using 3 mutexes only and I can't do it according to criteria.



      Any help will be appreciated, I have no idea how to use here just one mutex, where to put semaphore and conditional variable.




      Pseudo code:



      WRITER:



      glock();  //lock from reader
      

      
write_lock(); //wait till there is no readers
      

      
//write the data
      

      
write_unlock();
      

      
g_unlock();


      READER:



      g_lock();  //so reader can't read when writer locked g and writting
      
g_unlock();
      

      
read_lock();
      
reader++;
      
if (reader == 1)
      
    write_lock();   ///all consumers have consume 
      

      
//read the data
      

      
read_lock();
      
reader--;
      
if (reader == 0)
      
    write_unlock();
      
read_lock();






      c producer-consumer







      share|improve this question
















      I'm implementing the Producer/Consumer problem in C with some specific criteria:




      1. 1 producer, multiple consumers

      2. using only one mutex, one semaphore, one conditional variable

      3. All consumers have to consume (like a broadcast), and then, when all that producer have produced is already consumed by consumers, producer will produce more.


      I don't know how to implement it using only what I should according to criteria above.



      Here is the pseudo code I've wrote using 3 mutexes only and I can't do it according to criteria.



      Any help will be appreciated, I have no idea how to use here just one mutex, where to put semaphore and conditional variable.




      Pseudo code:



      WRITER:



      glock();  //lock from reader
      

      
write_lock(); //wait till there is no readers
      

      
//write the data
      

      
write_unlock();
      

      
g_unlock();


      READER:



      g_lock();  //so reader can't read when writer locked g and writting
      
g_unlock();
      

      
read_lock();
      
reader++;
      
if (reader == 1)
      
    write_lock();   ///all consumers have consume 
      

      
//read the data
      

      
read_lock();
      
reader--;
      
if (reader == 0)
      
    write_unlock();
      
read_lock();






      c producer-consumer




      c producer-consumer






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 22 '18 at 6:59









      Ruks

      1,091213




      1,091213










      asked Nov 22 '18 at 6:28









      AnnAnn

      177




      177
























          1 Answer
          1






          active

          oldest

          votes


















          0














          Here is solution which uses 1 mutex and two conditional variables which can support multiple producers-consumers. Pseudo code is in c++



          First read the thread safe buffer queue implementation here.



          Then check producer consumer solution https://codeistry.wordpress.com/2018/03/09/unordered-producer-consumer/.






          share|improve this answer























            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%2f53425039%2fproducer-consumer-1-producer-multiple-consumers-1-semaphore-1-mutex-1-con%23new-answer', 'question_page');
            }
            );

            Post as a guest















            Required, but never shown

























            1 Answer
            1






            active

            oldest

            votes








            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            0














            Here is solution which uses 1 mutex and two conditional variables which can support multiple producers-consumers. Pseudo code is in c++



            First read the thread safe buffer queue implementation here.



            Then check producer consumer solution https://codeistry.wordpress.com/2018/03/09/unordered-producer-consumer/.






            share|improve this answer




























              0














              Here is solution which uses 1 mutex and two conditional variables which can support multiple producers-consumers. Pseudo code is in c++



              First read the thread safe buffer queue implementation here.



              Then check producer consumer solution https://codeistry.wordpress.com/2018/03/09/unordered-producer-consumer/.






              share|improve this answer


























                0












                0








                0







                Here is solution which uses 1 mutex and two conditional variables which can support multiple producers-consumers. Pseudo code is in c++



                First read the thread safe buffer queue implementation here.



                Then check producer consumer solution https://codeistry.wordpress.com/2018/03/09/unordered-producer-consumer/.






                share|improve this answer













                Here is solution which uses 1 mutex and two conditional variables which can support multiple producers-consumers. Pseudo code is in c++



                First read the thread safe buffer queue implementation here.



                Then check producer consumer solution https://codeistry.wordpress.com/2018/03/09/unordered-producer-consumer/.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Dec 13 '18 at 8:52









                Ashish KhurangeAshish Khurange

                5616




                5616
































                    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%2f53425039%2fproducer-consumer-1-producer-multiple-consumers-1-semaphore-1-mutex-1-con%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







                    -

                    這個網誌中的熱門文章

                    Tangent Lines Diagram Along Smooth Curve

                    圖片
                    7 1 I am trying to replicate a diagram and have a minimal example. I don't know how to add additional tangents between the specified points and preserve smoothness. documentclass{article} usepackage{tikz} usetikzlibrary{calc,intersections} begin{document} begin{tikzpicture} % Axes draw [->, name path=x] (-1,0) -- (11,0) node [right] {$x$}; draw [->] (0,-1) -- (0,6) node [above] {$y$}; % Origin node at (0,0) [below left] {$0$}; % Points coordinate (start) at (1,-0.8); coordinate (c1) at (3,3); coordinate (c2) at (5.5,1.5); coordinate (c3) at (8,4); coordinate (end) at (10.5,-0.8); % show the points foreach n in {start,c1,c2,c3,end} fill [black] (n) circle (2pt) node [below] {}; % join the coordinates draw [thick,name path=curve] (start) to[out=70,in=180] (c1) to[out=0,in=180]
                    閱讀完整內容

                    Yusuf al-Mu'taman ibn Hud

                    圖片
                    Main article: Taifa of Zaragoza Al-Mu'taman Ruler of Zaragoza Reign 1081–1085 Predecessor Ahmad al-Muqtadir Successor Al-Mustain II Born Zaragoza Died 1085 Full name Yusuf ibn Ahmad al-Mu'taman ibn Hūd House Banu Hud Yusuf ibn Ahmad al-Mu'taman ibn Hūd (Arabic: المؤتمن بالله يوسف إبن أحمد إبن هود ‎, al-Mutaman bi l-Lah , died c. 1085) was the third king of the Banu Hud dynasty who ruled over the Taifa of Zaragoza from 1081 to 1085. Yusuf al-Mutaman reigned during the height of power of Muslim Zaragoza , following the thriving period of his father Ahmad al-Muqtadir. He continued his father's efforts and created around him a court of intellectuals, living in the beautiful palace of Aljafería, nicknamed as "the palace of joy". Al-Mu'taman was also a scholarly king and a patron of science, philosophy and arts. As an example of a wise king, he knew astrology, philosophy, and especially mathematics, a discipline in which
                    閱讀完整內容

                    Zucchini

                    圖片
                    This article is about the vegetable. For other uses, see Zucchini (disambiguation). Zucchini (courgette) A striped and a uniform color zucchini Genus Cucurbita Species Cucurbita pepo Origin 19th century northern Italy The zucchini ( / z uː ˈ k iː n i / , American English) or courgette ( / k ʊər ˈ ʒ ɛ t / , British English) is a summer squash which can reach nearly 1 metre (100 cm; 39 in) in length, but is usually harvested when still immature at about 15 to 25 cm (6 to 10 in). [1] A zucchini is a thin-skinned cultivar of what in Britain and Ireland is referred to as a marrow. [2] [3] In South Africa, a zucchini is known as a baby marrow. Along with certain other squashes and pumpkins, the zucchini belongs to the species Cucurbita pepo . It can be dark or light green. A related hybrid, the golden zucchini, is a deep yellow or orange color. [4] In a culinary context, the zucchini is treated as a vegetable; it is usually cooked and presented as a savory dish o
                    閱讀完整內容