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//
// atomic.h
//
// Atomic operations
//
// Copyright (C) 2002 Michael Ringgaard. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. Neither the name of the project nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
#if _MSC_VER > 1000
#pragma once
#endif
#ifndef ATOMIC_H
#define ATOMIC_H
#ifdef __cplusplus
extern "C" {
#endif
// On uniprocessors, the 'lock' prefixes are not necessary (and expensive).
// Since sanos does not (yet) support SMP the 'lock' prefix is disabled for now.
#pragma warning(disable: 4035) // Disables warnings reporting missing return statement
__inline int atomic_add(int *dest, int value) {
__asm {
mov edx, dest;
mov eax, value;
mov ecx, eax;
/*lock*/ xadd dword ptr [edx], eax;
add eax, ecx;
}
}
__inline int atomic_increment(int *dest) {
__asm {
mov edx, dest;
mov eax, 1;
/*lock*/ xadd dword ptr [edx], eax;
inc eax;
}
}
__inline int atomic_decrement(int *dest) {
__asm {
mov edx, dest;
mov eax, -1;
/*lock*/ xadd dword ptr [edx], eax;
dec eax;
}
}
__inline int atomic_exchange(int *dest, int value) {
__asm {
mov eax, value;
mov ecx, dest;
xchg eax, dword ptr [ecx];
}
}
__inline int atomic_compare_and_exchange(int *dest, int exchange, int comperand) {
__asm {
mov edx, dest
mov ecx, exchange
mov eax, comperand
/*lock*/ cmpxchg dword ptr [edx], ecx
}
}
#pragma warning(default: 4035)
#ifdef __cplusplus
}
#endif
#endif