atomic.c File Reference

#include "config.h"
#include <atomic.h>

Include dependency graph for atomic.c:

Go to the source code of this file.

Functions

void atomic_inc (atomic_t *counter)
 increment atomic counter without interruption.
 __asm__ ("\n\ .text\n\ .globl _atomic_inc\n\ _atomic_inc:\n\ stc ccr, r1h ; save flags\n\ orc #0x80, ccr ; disable all but NMI\n\ mov.b @r0, r1l\n\ inc r1l\n\ mov.b r1l, @r0\n\ ldc r1h, ccr ; restore flags\n\ rts\n\ ")
void atomic_dec (atomic_t *counter)
 decrement atomic counter without interruption.
 __asm__ ("\n\ .text\n\ .globl _atomic_dec\n\ _atomic_dec:\n\ stc ccr, r1h\n\ orc #0x80, ccr\n\ mov.b @r0, r1l\n\ dec r1l\n\ mov.b r1l, @r0\n\ ldc r1h, ccr\n\ rts\n\ ")


Function Documentation

__asm__ ( "\n\.text\n\.globl _atomic_dec\n\ _atomic_dec:\n\ stc   ccr,
r1h\n\orc#  0x80,
ccr\n\mov.b @  r0,
r1l\n\dec r1l\n\mov.b  r1l,
@r0\n\ldc  r1h,
ccr\n\rts\n\"   
)

__asm__ ( "\n\.text\n\.globl _atomic_inc\n\ _atomic_inc:\n\ stc   ccr,
r1h;save flags\n\orc#  0x80,
ccr;disable all but NMI\n\mov.b @  r0,
r1l\n\inc r1l\n\mov.b  r1l,
@r0\n\ldc  r1h,
ccr;restore flags\n\rts\n\"   
)

void atomic_dec ( atomic_t counter  ) 

decrement atomic counter without interruption.

locks interrupts except NMI, decrements count then restores interrupts.

Parameters:
counter the counter resource to be decremented
See also:
atomic_inc

void atomic_inc ( atomic_t counter  ) 

increment atomic counter without interruption.

locks interrupts except NMI, increments count then restores interrupts.

Parameters:
counter the counter resource to be incremented
See also:
atomic_dec

Referenced by sem_post().


brickOS is released under the Mozilla Public License.
Original code copyright 1998-2005 by the authors.

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