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84 lines
1.5 KiB
C
84 lines
1.5 KiB
C
/* $Id: interlock.c,v 1.2 2002/02/20 09:17:57 hyperion Exp $
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*/
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/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS POSIX+ Subsystem
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* FILE: subsys/psx/lib/psxdll/misc/interlock.c
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* PURPOSE: inter-locked increments/decrements
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* PROGRAMMER: KJK::Hyperion <noog@libero.it>
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* UPDATE HISTORY:
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* 20/01/2002: Adapted from lib/kernel32/synch/intrlck.c
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*/
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/*
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* NOTE by KJK::Hyperion: I do not understand what's behind these functions.
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* Don't ask me how they work, or to fix errors in them.
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* Please refer to the authors referenced in the original
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* file, lib/kernel32/synch/intrlck.c
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*/
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/* TODO? move these in some shared library */
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#include <psx/interlock.h>
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int __interlock_inc(int * addend)
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{
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int ret = 0;
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__asm__
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(
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" lock\n" /* for SMP systems */
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" incl (%1)\n"
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" je 2f\n"
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" jl 1f\n"
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" incl %0\n"
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" jmp 2f\n"
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"1: dec %0\n"
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"2:\n"
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:"=r" (ret):"r" (addend), "0" (0): "memory"
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);
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return (ret);
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}
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int __interlock_dec(int * addend)
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{
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int ret = 0;
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__asm__
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(
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" lock\n" /* for SMP systems */
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" decl (%1)\n"
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" je 2f\n"
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" jl 1f\n"
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" incl %0\n"
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" jmp 2f\n"
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"1: dec %0\n"
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"2:\n"
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:"=r" (ret):"r" (addend), "0" (0): "memory"
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);
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return (ret);
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}
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int __interlock_add(int * addend, int increment)
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{
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int ret = 0;
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__asm__
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(
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" lock\n" /* for SMP systems */
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" xaddl %0,(%1)"
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:"=r" (ret)
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:"r" (addend), "0" (increment)
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:"memory"
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);
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return (ret);
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}
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/* EOF */
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