Pelles C forum

C language => Work in progress => Topic started by: czerny on February 06, 2013, 06:32:25 pm

Title: lifofifo
Post by: czerny on February 06, 2013, 06:32:25 pm
I am a little bit in hurry!

I wrote code for a stack and a double linked list which I need for a actual project. It would be nice if anyone could test it. I don't have the time now to test it as I should.

czerny

::: old bugs removed, new bugs created :-)
::: more of them

Title: Re: lifofifo
Post by: czerny on May 16, 2013, 09:44:05 am
I see that there are 0 downloads. Was the last release sooo bad?
Title: Re: lifofifo
Post by: frankie on May 16, 2013, 10:18:53 am
I have already downloaded it time ago.
I had no time to test it, but formally they seems ok.
If you have uploaded a new version the download counter resets, and if you don't add a new post the update is not signaled as new post.
Title: Re: lifofifo
Post by: czerny on May 16, 2013, 07:20:37 pm
If you have uploaded a new version the download counter resets, and if you don't add a new post the update is not signaled as new post.
Ahhh! I didn't know that.
Title: Re: lifofifo
Post by: czerny on May 21, 2013, 11:41:34 pm
This is a new version with a circular buffer for strings (CRing). ;D
A wide char version (WRing) will follow.
Title: Re: lifofifo
Post by: czerny on May 22, 2013, 08:30:45 am
I would like to have some more challanging test examples.
Any ideas?
Title: Re: lifofifo
Post by: jj2007 on May 24, 2013, 12:35:52 am
A simple test case would be nice...

What is the difference between the Ring and the circular buffer?

You use CircBufWrite (but no CircBufRead), RingWrite and RingRead, each of them with a memcpy. In my implementation, there is something like CircBufferGetPointer, but the user has to decide how to write into the buffer. For example, GetCurrentDirectory(260, CircBufferGetPointer()). IMHO it avoids unnecessary copies...
Title: Re: lifofifo
Post by: czerny on May 24, 2013, 12:48:45 am
A simple test case would be nice...
Search for circbuf-tst.c
In my implementation, there is something like CircBufferGetPointer, but the user has to decide how to write into the buffer. For example, GetCurrentDirectory(260, CircBufferGetPointer()). IMHO it avoids unnecessary copies...
Code: [Select]
GetCurrentDirectory(260, CircBufWrite(Buffer, NULL, 260))
Title: Re: lifofifo
Post by: jj2007 on May 24, 2013, 11:19:07 am
GetCurrentDirectory(260, CircBufWrite(Buffer, NULL, 260))

   void *p = &R->buffer[R->pos];
   if (data)
      memcpy(p, data, len);
   else
      memset(p, 0, len);


OK, I see.
Title: Re: lifofifo
Post by: czerny on May 24, 2013, 03:24:51 pm
What is the difference between the Ring and the circular buffer?
Ring is a data structure which holds equal sized objects. They are written by a producer and read by a consumer who remove the objects. It is possible to detect, if the ring is full or empty. CircBuf is more a all purpose temporary memory, as discussed.
Title: Re: lifofifo
Post by: czerny on May 24, 2013, 03:37:37 pm
It would be interesting for me to discuss such a ring in a multithreaded environment with different threads, producing/consuming objects.
Per example: What is the overhead of using  the C11 _Atomic qualifier.