timer_create（）： - 1 EAGAIN（资源暂时不可用）

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".I'm having trouble to create timer under my emb