Databases
StackOverflow2013
Postsdbo
POThread calling enqueue function in C
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POThread calling enqueue function in C
    primarykey
    data
    text
    <p>I have:</p> <pre><code>struct elem { data d; struct elem *next; }; typedef struct elem elem; struct queue { int cnt; elem *front; elem *rear; }; void enqueue(data d, queue *q); void enqueue(data d, queue *q) { elem *p; p = malloc(sizeof(elem)); p -&gt; d = d; p -&gt; next = NULL; if (!empty(q)) { q -&gt; rear -&gt; next = p; q -&gt; rear = p; } else q -&gt; front = q -&gt; rear = p; q -&gt; cnt++; } </code></pre> <p>which would be call:</p> <pre><code>int main(){ struct queue Q; initialize(&amp;Q); //init the queue enqueue( 10000, &amp;Q); return 0; } </code></pre> <p>and some thread creation like: </p> <pre><code> #include &lt;pthread.h&gt; #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #define NUM_THREADS 5 /** * * */ pthread_t threads[NUM_THREADS]; long t; for(t=0;t&lt;NUM_THREADS;t++){ pthread_create(&amp;threads[t], NULL, enqueue, (void *)t); } </code></pre> <p>How should I modify the enqueue function so in the pthread_create each thread call </p> <pre><code>enqueue( variable, &amp;Q); </code></pre> <p>(I am doing a lock free queue, and already has the logic, but I am stuck in How would each thread call enqueue function...)</p> <p><strong>--EDIT--</strong></p> <p>I am doing the answer proposed and getting:</p> <pre><code> queue.c: In function ‘main’: queue.c:130: warning: passing argument 3 of ‘pthread_create’ from incompatible pointer type /usr/include/pthread.h:227: note: expected ‘void * (*)(void *)’ but argument is of type ‘void (*)(data, struct queue *)’ </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. UScMinor
    1. UScMinor
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload