44 lines
1.6 KiB
C++
44 lines
1.6 KiB
C++
/*
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* Copyright (c) 2012, 2013 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* sortix/kernel/interlock.h
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* Functions that perform non-atomic operations in an atomic manner.
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*/
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#ifndef _INCLUDE_SORTIX_KERNEL_INTERLOCK_H
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#define _INCLUDE_SORTIX_KERNEL_INTERLOCK_H
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namespace Sortix {
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typedef unsigned long (*ilockfunc)(unsigned long, unsigned long);
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typedef struct
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{
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unsigned long o; // old value
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unsigned long n; // new value
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} ilret_t;
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// These atomically modifies a value and return the previous value.
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ilret_t InterlockedModify(unsigned long* ptr,
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ilockfunc f,
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unsigned long user = 0);
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ilret_t InterlockedIncrement(unsigned long* ptr);
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ilret_t InterlockedDecrement(unsigned long* ptr);
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ilret_t InterlockedAdd(unsigned long* ptr, unsigned long arg);
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ilret_t InterlockedSub(unsigned long* ptr, unsigned long arg);
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} // namespace Sortix
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#endif
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