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School of Computer Science & Engineering
University of New South Wales
 Advanced Operating Systems 
  COMP9242 2002/S2 
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IPC Timeout Specifications

An IPC operation specifies 4 timeout values:

\(m_r, e_r\):
receive timeout is \(m_r 4^{15-e_r}\,\mu s\)
\(m_s, e_s\):
send timeout is \(m_s 4^{15-e_s}\,\mu s\)
\(p_r\):
receive page fault timeout is \(4^{15-p_r}\,\mu s\)
\(p_s\):
send page fault timeout is \(4^{15-p_s}\,\mu s\)
Zero values of \(e\) or \(p\) mean \(\infty\), i.e., no timeout
Zero values of \(m\) (with \(e>0\) mean 0, i.e., never block)
Max values of \(p\) (\(p=15\)) mean 0, i.e., fail on page fault

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Gernot Heiser 2002-08-07