title: valgrind memory leak errors when using pthread_create
body: <p>I'm writing a program using the pthread library. When I run my program with the command <code>valgrind --leak-check=full</code>, I get the following errors description:  </p>
  
  <pre><code>==11784==  
  ==11784== **HEAP SUMMARY:**  
  ==11784==     in use at exit: 4,952 bytes in 18 blocks  
  ==11784==   total heap usage: 1,059 allocs, 1,041 frees, 51,864 bytes allocated  
  ==11784==  
  ==11784== **288 bytes** in 1 blocks are possibly lost in loss record 2 of 3  
  ==11784==    at 0x4C2380C: calloc (vg_replace_malloc.c:467)  
  ==11784==    by 0x4010D2E: _dl_allocate_tls (dl-tls.c:300)  
  ==11784==    by 0x55DC218: **pthread_create**@@GLIBC_2.2.5 (allocatestack.c:570)  
  ==11784==    by 0x401BC0: initdevice(char*) (in /a/fr-01/vol/home/stud/lim/workspace  /Ex3/l)  
  ==11784==    by 0x406D05: main (in /a/fr-01/vol/home/stud/lim/workspace/Ex3/l)  
  ==11784==  
  ==11784== **4,608 bytes** in 16 blocks are possibly lost in loss record 3 of 3  
  ==11784==    at 0x4C2380C: calloc (vg_replace_malloc.c:467)  
  ==11784==    by 0x4010D2E: _dl_allocate_tls (dl-tls.c:300)  
  ==11784==    by 0x55DC218: **pthread_create**@@GLIBC_2.2.5 (allocatestack.c:570)    
  ==11784==    by 0x40268F: write2device(char*, int) (in /a/fr-01/vol/home/stud/lim/workspace/Ex3/l)  
  ==11784==    by 0x406D7B: main (in /a/fr-01/vol/home/stud/lim/workspace/Ex3/l)  
  ==11784==  
  ==11784== **LEAK SUMMARY:**  
  ==11784==    definitely lost: 0 bytes in 0 blocks  
  ==11784==    indirectly lost: 0 bytes in 0 blocks  
  ==11784==      possibly lost: 4,896 bytes in 17 blocks  
  ==11784==    still reachable: 56 bytes in 1 blocks  
  ==11784==         suppressed: 0 bytes in 0 blocks  
  ==11784== Reachable blocks (those to which a pointer was found) are not shown.  
  ==11784== To see them, rerun with: --leak-check=full --show-reachable=yes  
  ==11784==  
  ==11784== For counts of detected and suppressed errors, rerun with: -v  
  ==11784== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 4 from 4)  
  </code></pre>
  
  <hr>
  
  <p>Every time I call <code>pthread_create</code>, with a certain function - I call the function <code>pthread_exit</code> in the end of the function. So, after verifying this is not the problem, what could be the problem?</p>