title: timer_create() : -1 EAGAIN (Resource temporarily unavailable)
body: <p>I'm having trouble to create timer under my embedded Linux running ARM. I'm using a home made C++ library to manage timer. I didn't code it myself, I don't know deeply the implementation despite I have access to the source code... It works for a while and then I got the error "EAGAIN".</p>
  
  <p>Using strace I noticed that when it doesn't work the timer ID is quiet high!</p>
  
  <pre><code>timer_create(CLOCK_MONOTONIC, {0, SIGRT_3, SIGEV_SIGNAL, {...}}, 0xbed50af4) = -1 EAGAIN (Resource temporarily unavailable)
  </code></pre>
  
  <p>See the pretty low timer ID when it's working:</p>
  
  <pre><code>timer_create(CLOCK_MONOTONIC, {0x3, SIGRT_3, SIGEV_SIGNAL, {...}}, {0x3d}) = 0
  </code></pre>
  
  <p>I thought that the number of timers was unlimited! Actually not? Should we destroy the timer once we are done with it? I also used the "timer_stats" kernel utility but this didn't help me much ... Are there other debug utility for the timers inside the kernel or any other tool?</p>
  
  <p>Thanks for your help!</p>