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Andrew S. Tanenbaum (OS) Edition 4 Exercise 2 Question 22 (Page No. 175)

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Suppose that an operating system does not have anything like the select system call to see in advance if it is safe to read from a file, pipe, or device, but it does allow alarm clocks to be set that interrupt blocked system calls. Is it possible to implement a threads package in user space under these conditions? Discuss.
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