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* Copyright (c) 2001-2004 Jakub Jermar
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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/** Request with no timeout. */
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#define SYNCH_NO_TIMEOUT 0
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/** No flags specified. */
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#define SYNCH_FLAGS_NONE 0
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/** Non-blocking operation request. */
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#define SYNCH_FLAGS_NON_BLOCKING (1 << 0)
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/** Interruptible operation. */
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#define SYNCH_FLAGS_INTERRUPTIBLE (1 << 1)
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/** Could not satisfy the request without going to sleep. */
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#define ESYNCH_WOULD_BLOCK 1
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/** Timeout occurred. */
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#define ESYNCH_TIMEOUT 2
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/** Sleep was interrupted. */
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#define ESYNCH_INTERRUPTED 4
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/** Operation succeeded without sleeping. */
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#define ESYNCH_OK_ATOMIC 8
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/** Operation succeeded and did sleep. */
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#define ESYNCH_OK_BLOCKED 16
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#define SYNCH_FAILED(rc) \
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((rc) & (ESYNCH_WOULD_BLOCK | ESYNCH_TIMEOUT | ESYNCH_INTERRUPTED))
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#define SYNCH_OK(rc) \
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((rc) & (ESYNCH_OK_ATOMIC | ESYNCH_OK_BLOCKED))