Don't know if setrlimit support the stack but you can set the max stack size with -N option of qcc.

-----Original Message-----
From: Liam Howlett [mailto:community-noreply@qnx.com] 
Sent: Wednesday, July 22, 2009 11:40 AM
To: ostech-core_os
Subject: limiting processes stack usage with setrlimit() issue

hey,

I'm still trying to reduce memory usage in our application load.  I noticed our watchdog process that writes to one area
 of memory every so often is using over 600KB.  The IDE says that thread 1 has 500K of unallocated stack memory.  There 
is only one thread, so I think that a direct setrlimit should work as per the definition of RLIMIT_STACK

I tried using the setrlimit call on RLIMIT_STACK to limit it to 50KB in main, but nothing changes.
Code snippit:
    getrlimit(RLIMIT_STACK, &rlim);
    rlim.rlim_cur=50*1024;
    rlim.rlim_cur_hi=50*1024;
    rlim.rlim_max=50*1024;
    rlim.rlim_max_hi=50*1024;
    int rc = setrlimit(RLIMIT_STACK, &rlim);
rc is zero, so setrlimit worked.. but the stack still has a huge chunk of memory unallocated (and reserved from what I 
understand).

Is this the correct method of limiting large stack allocations for a process that does not need that much?  What am I 
doing wrong?

Any ideas are appreciated.

Thank you,
Liam



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OSTech
http://community.qnx.com/sf/go/post34325