多线程程序被“闹钟”中断

Question

All, my multithreaded program keeps getting interrupted and "Alarm clock" is being written to console.

After some googling, many people mention this is related to "sleep," but none of my threads are calling sleep. The current process is

1. Pass a function and parameters to a starter function
2. Starter function starts n threads and passes function from (1) and proper parameters to each thread
3. Each thread runs function with the parameters it was given, each function is independent only relying on parameters and local memory.
4. Starter function joins each created thread pthread_join(cur_thread[i], 0)

I've been trying to use strace and gdb to figure out whats throwing the signal. gdb just says "No stack" and strace doesn't stop at all... I'm thinking I'm about to over write the SIGALRM signal handler...

I'm out of ideas, could anyone offer any suggestions?

New information : This seems to be related to libcurl. I use it to get mjpegs from the network. If I do not use libcurl, the SIGALRM does not fire. My libcurl code is as follows:

static void * capture_function(void * cam)
{
    MyData * camera = (MyData *)cam;

    //Create the curl
    camera->m_curl = curl_easy_init();

    //Connect to the camera
    curl_easy_setopt(camera->m_curl, CURLOPT_URL, camera->m_ip);

    //Set up our callback functions
    curl_easy_setopt(camera->m_curl, CURLOPT_WRITEFUNCTION, CurlWriteCallback);
    curl_easy_setopt(camera->m_curl, CURLOPT_WRITEDATA, (void *)camera);
    curl_easy_perform(camera->m_curl);

    camera->m_state = camera->m_state & ~CAPTURING; //Remove the capturing flag;
    curl_easy_cleanup(camera->m_curl);

    return NULL;
}

Answer 1

This was related to libcurl . I had to use

 setopt(handle, CURLOPT_NOSIGNAL, 1);