mirror of
https://github.com/reactos/reactos.git
synced 2024-11-18 21:13:52 +00:00
83 lines
1.5 KiB
C
83 lines
1.5 KiB
C
/* $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 */
|
|
|