reactos/posix/lib/psxdll/misc/interlock.c

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/* $Id: interlock.c,v 1.4 2002/10/29 04:45:33 rex Exp $
*/
/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS POSIX+ Subsystem
* FILE: subsys/psx/lib/psxdll/misc/interlock.c
* PURPOSE: inter-locked increments/decrements
* PROGRAMMER: KJK::Hyperion <noog@libero.it>
* UPDATE HISTORY:
* 20/01/2002: Adapted from lib/kernel32/synch/intrlck.c
*/
/*
* NOTE by KJK::Hyperion: I do not understand what's behind these functions.
* Don't ask me how they work, or to fix errors in them.
* Please refer to the authors referenced in the original
* file, lib/kernel32/synch/intrlck.c
*/
/* TODO? move these in some shared library */
#include <psx/interlock.h>
int __interlock_inc(int * addend)
{
int ret = 0;
__asm__
(
" lock\n" /* for SMP systems */
" incl (%1)\n"
" je 2f\n"
" jl 1f\n"
" incl %0\n"
" jmp 2f\n"
"1: dec %0\n"
"2:\n"
:"=r" (ret):"r" (addend), "0" (0): "memory"
);
return (ret);
}
int __interlock_dec(int * addend)
{
int ret = 0;
__asm__
(
" lock\n" /* for SMP systems */
" decl (%1)\n"
" je 2f\n"
" jl 1f\n"
" incl %0\n"
" jmp 2f\n"
"1: dec %0\n"
"2:\n"
:"=r" (ret):"r" (addend), "0" (0): "memory"
);
return (ret);
}
int __interlock_add(int * addend, int increment)
{
int ret = 0;
__asm__
(
" lock\n" /* for SMP systems */
" xaddl %0,(%1)"
:"=r" (ret)
:"r" (addend), "0" (increment)
:"memory"
);
return (ret);
}
/* EOF */