By mswatcher
via jlouisramblings.blogspot.ru
Submitted: Dec 29 2012 / 13:08
In UNIX there is a specific error number which can be returned from system calls. This error, EAGAIN is used by the OS kernel whenever it has a complex state in which it is deemed too hard to resolve a proper answer to the userland application. The solution is almost a non-solution: you punt the context back to the user program and ask that it goes again and retries the operation. Then the kernel gets rid of the complex state and the next time the program enters the kernel, we can be in another state without the trouble.
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