harvey/sys/include/atomic.h

/*
 * Copyright (c) 2013, The Regents of the University of California (Regents).
 * All Rights Reserved.
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 * modification, are permitted provided that the following conditions are met:
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 *    derived from this software without specific prior written permission.
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 * IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
 * SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING
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 * REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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#define atomic_set(ptr, val) (*(volatile typeof(*(ptr)) *)(ptr) = val)
#define atomic_read(ptr) (*(volatile __typeof__(*(ptr)) *)(ptr))