• State Not Answered
  • Locked Locked
  • Replies 9 replies
  • Subscribers 21 subscribers
  • Views 2937 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

reentrant RTX51 Tiny

Klaus Wang

This is a question about reentrant functions in RTX51 Tiny System.
AS follows articles I found in http://www.keil.com/support/man/docs/tr51/tr51_reentrant.htm:
" You should disable Round-Robin Task Switching if you wish to invoke reentrant or non-reentrant function from more than one task or interrupt. "

If I want to invoke either reentrant functions or non-reentrant functions in RTX51 Tiny system, and they will be called in one more tasks, I should DISABLE Round-Robin Task Switching in CONF_TNY.A51.

Is it right?

Another question is that: addition, subtraction, multiplication, division in C51 library, are they all reentrant functions? Any I should be careful when I use them in one more tasks of RTX51 Tiny system?

Parents
  • 0

    Thank you guys for the useful information.
    Right now I know that if I want to make sure functions can be called by one more tasks simultaneouslly, I should declare it with reentrant keyword.
    Another test is that I create 2 functions as follows:

    void test1(void) {
  unsigned char tmp1, tmp2;
  tmp1 = 10;
  tmp2 = 8;
}

void test2(void) {
  unsigned char tmp1, tmp2;
  tmp1 = 10;
  tmp2 = 8;
  tmp2 = tmp1/tmp2;
}


    I found that a WARNING message occur while building target with test1(), the message is MULTIPLE CALL TO SEGMENT. But I can build with test2() sucessfully.
    I know that whatever test1() or test2() all have overlay data group in *.M51. But I don't know what is the difference between test1() and test2().
    Could you explain why the warning message occur?

Reply
  • 0

    Thank you guys for the useful information.
    Right now I know that if I want to make sure functions can be called by one more tasks simultaneouslly, I should declare it with reentrant keyword.
    Another test is that I create 2 functions as follows:

    void test1(void) {
  unsigned char tmp1, tmp2;
  tmp1 = 10;
  tmp2 = 8;
}

void test2(void) {
  unsigned char tmp1, tmp2;
  tmp1 = 10;
  tmp2 = 8;
  tmp2 = tmp1/tmp2;
}


    I found that a WARNING message occur while building target with test1(), the message is MULTIPLE CALL TO SEGMENT. But I can build with test2() sucessfully.
    I know that whatever test1() or test2() all have overlay data group in *.M51. But I don't know what is the difference between test1() and test2().
    Could you explain why the warning message occur?

Children