Re: pthread memory leaks

Ian Collins <>
Tue, 31 May 2011 11:50:47 +1200
On 05/31/11 11:29 AM, jakash3 wrote:

I'm experimenting with signals and conditional variables to implement
thread suspension. The following appears to execute without any
problems but valgrind reports memory leaks.
What can I do to stop the memory leaks? Is there some type of pthread
related memory free function I'm forgetting?

You'd be better of on a Linux or Unix group for this kind of question.
However there are a few C++ specific issues:


pthread_mutex_t m;
pthread_cond_t c;

void freeze(int sig) {
void quit(int sig) { pthread_exit(0); }

void* tfunc(void* param) {
    while (1) {

As you have included the C++ versions of the C library headers, fictions
form them like puts should be written std::puts. Some compilers put
them in the namespace, while others (like gcc) declare them in and out
of the namespace, which is a pain.

    return NULL;

This are all assigned to C function pointers, so they should be declared
as extern "C" (gcc ignores this).

<snip code>

valgrind output:
==2993== HEAP SUMMARY:
==2993== in use at exit: 144 bytes in 1 blocks
==2993== total heap usage: 1 allocs, 0 frees, 144 bytes allocated
==2993== LEAK SUMMARY:
==2993== definitely lost: 0 bytes in 0 blocks
==2993== indirectly lost: 0 bytes in 0 blocks
==2993== possibly lost: 144 bytes in 1 blocks

Note this is an in use block, not an actual leak. Probably an internal
I/O buffer.

Ian Collins

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