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Type: Posts; User: hzmonte

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  1. Replies
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    2,836

    Conversion of pointers to functions

    References to section numbers are to the C99 standard as found at http://www.open-std.org/JTC1/SC22/WG14/www/docs/n1124.pdf.

    Item 3 of Sec 6.5.4 "Cast operators" says: "Conversion that involve...
  2. Thread: offsetof

    by hzmonte
    Replies
    10
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    2,018

    offsetof

    <<split from 40936>>

    If I call this offsetof() macro in a function:


    int func([type] struct_name, [type] member)
    {
    ...
    x = offsetof(struct_name, member);
    ...
  3. Using address of a parameter of a function

    I inherit this piece of code:


    struct LINK *link_id_search(int link_id)
    {
    struct LINK *link;
    link = (LINK *) splaySearch(daemon_body.links, &link_id);
    return link;
    }
  4. Replies
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    In that case, it would also achieve the same...

    In that case, it would also achieve the same purpose if I write
    #if (_XOPEN_SOURCE + 0 == 600)
    , right?
  5. Replies
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    Testing the value of an object-like macro

    I see in some header files, such as Sun's <sys/feature_tests.h>, the value of a macro is subtracted by zero before testing it against a value. Example:


    #if (_XOPEN_SOURCE - 0 == 600) ||...
  6. Replies
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    In most of the examples for callback functions I...

    In most of the examples for callback functions I saw on the Web, the callback function is passed as a parameter of the caller function. Now, in payEmployee(), the callback function is pre-stored in a...
  7. What do you mean by the representation of a...

    What do you mean by the representation of a pointer? Don't all pointers have the same size? And besides size, what are there in the representtaion?

    I do not like what brewbuck suggests because...
  8. pointer to pointer to void - dereferencing type-punned pointer, strict-aliasing rule

    int
    dequeue_shared_queue(struct shared_queue *q, void **elem)
    {
    pthread_mutex_lock(&(q->access));
    *elem = fifoQueueDequeue(q->queue);
    pthread_mutex_unlock(&(q->access));
    }

    struct...
  9. Replies
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    13,674

    What is a hook function?

    Can someone give an example? Is it the same as a callback function? Is a signal handler a hook function? Thx.
  10. Replies
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    5,018

    How about putting the solution(s) in the FAQ "How...

    How about putting the solution(s) in the FAQ "How to ...?"
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    5,018

    I know I am chewing up CPU resources, that's why...

    I know I am chewing up CPU resources, that's why the title is "How to WASTE CPU cycles in a program?" I do not mind that. I also know the speed of the computer will affect the amount of delay,...
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    How to waste CPU cycles in a program?

    I want the program to spend some time running but 'for ( ; ; )' is not suitable because I do not want it to run forever. I want something that I can kind of control how long it runs. That is, I want...
  13. I inherited a middleware that already used...

    I inherited a middleware that already used SIGUSR1 for signalling a 'thread injection' and SIGUSR2 for some fault tolerance/checkpointing purposes.
  14. What if I need more than SIGUSR1 and SIGUSR2?

    POSIX defines only 2 user-defined signals. What if I need more than that?
    I guess one way is use one of the less used signal, for example:
    #define SIGUSR3 SIGWINCH
    But which are the less...
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    It indeed does appear to have something to do...

    It indeed does appear to have something to do with whether the variable in question is an int or a float.


    #include <stdlib.h>
    int main(int argc, char *argv[])
    {
    int i,j,k;
    int T;
    int...
  16. Replies
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    2,352

    Why isn't this C program optimized?

    for (j=1; j<=3120; j++) {
    for (i=1; i<=j-1; i++) {
    T = 0.0;
    for (k=1; k<=i-1; k++)
    T += 0.0;
    }
    }
    printf("T=%f\n", T);

    I use gcc 3.4.1 (with -O3) on an AMD Opteron...
  17. So, the state of a variable includes who is...

    So, the state of a variable includes who is responsible for disposing it?
    Even so, the memory deallocation of the item may not be the responsibility of the queue ADT. I may call dequeue() to get...
  18. Assumed my_func() is called exclusively by...

    Assumed my_func() is called exclusively by pthread_create(). Which one of the following is better?


    int my_func1(struct my_struct *x) {
    // whole bunch of useful work
    return result;
    }
    ...
  19. What is proper depends on your viewpoint. Let's...

    What is proper depends on your viewpoint. Let's say my_func(), in addition to being passed as a parameter of pthread_create(), is also called by some other function, and in the latter case, it is...
  20. Consequence of const-ifying a function parameter

    Correct me if I am wrong, declaring formal parameters to functions as const, if they should not be/is not changed, has 2 benefits;
    1. It tells the program that calls this function that the parameter...
  21. "Two different things."

    1. int my_func(struct my_struct *x) { ... }
    ret = pthread_create(&tid, NULL, (void *(*)(void *))my_func, y);
    2. void *my_func(void *xx) { struct my_struct *x = (struct my_struct *)xx; ... }
    ...
  22. Thanks, quzah. The definition of my caller...

    Thanks, quzah. The definition of my caller should have been:
    void caller(void (*callee)(void *), void *arg) { ... }
    One more question:
    The prototype of pthread_create() is
    int...
  23. 1. I have this piece of test code: #include...

    1. I have this piece of test code:


    #include <stdio.h>

    void callee(void *msg)
    {
    char *m = (char *)msg;
    printf("%s\n", m);
    }
  24. How to understand the prototype of a function that is a parameter of another function

    On my Solaris 9 system, the prototype of the pthread_cleanup_push() function is, according to the man page:

    void pthread_cleanup_push(void (*handler, void *), void *arg);

    However, on my...
  25. That statement was first stated by King Mir. It...

    [/QUOTE]
    That statement was first stated by King Mir. It was refuted by me before anyone else. (Actually quzah agreed to it in his/her June 16 3:17PM post.)

    Maybe someone tried to explain that...
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