Hi I have made an app with 2 POSIX threads for my linux kernel(2.6 microtronix). When I establish my 2 pthread_t varibles the kernel simply reboots. The uClibC has built in support for POSIX threads, so I don&#39;t really understand why it has problems with establishing these varibles(I don&#39;t even create the threads). Regards GreateWhite.DK

Think that I might be having some problems with my memory control in the kernel. So it&#39;s not a POSIX thing. I have the same problem if I establish a array of 1000 int&#39;s. GreateWhite.DK

Hi GreateWhite.DK, I am not sure where you put the 4k array. If it is on the stack, you have to make sure your stack is big enough (you can use flthdr to check the size of the stack for an application). wentao

Hi wentao Thx for your answer. I have tried making my stack for my app 12K big. I used the "elf2flt -s 12000" command. I could not find the "flthdr" command that you mentioned in the elf tools. The kernel still reboots when I try to start my app. The stacksize I changed was the APP&#39;s and not the kernel&#39;s. Should it be the kernels(if yes how can this be done)??? <div class='quotetop'>QUOTE </div> --- Quote Start --- I am not sure where you put the 4k array[/b] --- Quote End --- Can/should I control this myself? Regards GreateWhite.DK

GreateWhite.DK, 12k is not actually big (depending how complex your application is). Can you try 32k? The size of the kernel stack is fixed (2 pages, around 8k), and I dont think it is the cause of your problem. flthdr is a utility to check the flat header information generated by elf2flt. Since you know how to set the stack size, you don&#39;t have to find it. <div class='quotetop'>QUOTE </div> --- Quote Start --- Can/should I control this myself?[/b] --- Quote End --- if you declare this array as a global or static variable, it is on the heap, not on the stack. but if you declare it as a automatic variable, it is on the stack. Regards, wentao

Hi wentao I have now tried with 32K. That did not do the trick sadly. <div class='quotetop'>QUOTE </div> --- Quote Start --- if you declare this array as a global or static variable, it is on the heap, not on the stack. but if you declare it as a automatic variable, it is on the stack.[/b] --- Quote End --- I declare it as a variable. Best regards GreateWhite.DK

Has anyone else had problems with POSIX threads?

23 Replies

Altera_Forum
Honored Contributor
21 years ago
Hi,

I thought your problem was not related to pthreads (the last example you passed to me had all pthread stuff commented out). If you want to use pthread, your previous Makefile is not enough. You need to tell the linker to link the pthread library, and it must appear before the C library, otherwise the dummies in C library will be linked in. Please add the following line to your Makefile:

LDLIBS:=-lpthread $(LDLIBS)

I tried your program several times, did not find any problems, and here is the output:
<div class='quotetop'>QUOTE </div>
--- Quote Start ---
##################################
Will now allocate 8096 bytes

**********************************
8096 bytes allocated
Will now create threads!!!
1!
Thread One created!!!
Thread 1
Thread 2
Thread 1 returns: 31916302
Thread 2 returns: 0[/b]
--- Quote End ---

wentao
Altera_Forum
Honored Contributor
21 years ago
Hi Wentao

I have finally gotten the threads running now. I just thought that the pthread support was automatically supported when the ulibc was used.
But many many thanks wentao you are a lifesaver. The champagne bottles are popping here http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/biggrin.gif

BEST REGARDS
GreateWhite.DK
Altera_Forum
Honored Contributor
21 years ago
Hi GreateWhite.DK,

You are welcome, I am happy to know that problem is gone.

Regards,
wentao

Forum Discussion

Has anyone else had problems with POSIX threads?

23 Replies

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