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POHow can I decide how much stack I can use after a call to pthread_attr_setstacksize?
 

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  1. POHow can I decide how much stack I can use after a call to pthread_attr_setstacksize?
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    <p>I am trying to debug some code regarding stack usage. I have made the following test program (just as an example to figure out how the pthread library works):</p> <pre><code>#include &lt;string.h&gt; #include &lt;pthread.h&gt; #include &lt;stdlib.h&gt; #include &lt;assert.h&gt; #include &lt;limits.h&gt; #include &lt;stdio.h&gt; static void *threadFunc1(void *arg) { char arr[5000]; printf("Hello fromt threadFunc1 address of arr:%p\n", &amp;arr); return; } static void *threadFunc2(void *arg) { char arr[10000]; printf("Hello fromt threadFunc2 adress of arr:%p\n", &amp;arr); return; } int main(int argc, char *argv[]) { pthread_t t1,t2; pthread_attr_t thread_attr; void *res; int s; size_t tmp_size=0; s=pthread_attr_init(&amp;thread_attr); assert(s==0); s=pthread_attr_setstacksize(&amp;thread_attr , PTHREAD_STACK_MIN ); assert(s==0); s=pthread_attr_getstacksize(&amp;thread_attr , &amp;tmp_size ); assert(s==0); printf("forced stack size of pthread is:%zd\n", tmp_size); printf("sizeof char is %zd\n", sizeof(char)); s = pthread_create(&amp;t1, &amp;thread_attr, threadFunc1, NULL); assert(s==0); sleep(1); s = pthread_create(&amp;t2, &amp;thread_attr, threadFunc2, NULL); assert(s==0); sleep(1); printf("Main done()\n"); exit(0); } </code></pre> <p>When I execute it I get the following output (on my x86_64 Ubuntu):</p> <pre><code>forced stack size of pthread is:16384 sizeof char is 1 Hello fromt threadFunc1 address of arr:0x7fef350d3b50 Segmentation fault (core dumped) </code></pre> <p>Is there a way to know how much is left of the requested PTHREAD_STACK_MIN when I enter my newly created thread? If I change the size of the char array when I enter the thread function it seems like the limit is somewhen between 7000 to 8000 which is not what I expected (somewhere in the near of 16384).</p>
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