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ringbuf: Add SMP support

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This commit is contained in:
Sebastian Huber
2013-08-26 15:25:58 +02:00
parent 4957272cb1
commit ef3640f7a7
1 changed files with 9 additions and 6 deletions
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15
cpukit/libcsupport/include/ringbuf.h
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@@ -10,6 +10,8 @@
#ifndef _RTEMS_RINGBUF_H
#define _RTEMS_RINGBUF_H
#include <rtems.h>
#ifndef RINGBUF_QUEUE_LENGTH
#define RINGBUF_QUEUE_LENGTH 128
#endif
@@ -18,6 +20,7 @@ typedef struct {
uint8_t buffer[RINGBUF_QUEUE_LENGTH];
volatile int head;
volatile int tail;
rtems_interrupt_lock lock;
} Ring_buffer_t;
#define Ring_buffer_Initialize( _buffer ) \
@@ -33,22 +36,22 @@ typedef struct {
#define Ring_buffer_Add_character( _buffer, _ch ) \
do { \
uint32_t isrlevel; \
rtems_interrupt_level isrlevel; \
\
rtems_interrupt_disable( isrlevel ); \
rtems_interrupt_lock_acquire( &(_buffer)->lock, isrlevel ); \
(_buffer)->tail = ((_buffer)->tail+1) % RINGBUF_QUEUE_LENGTH; \
(_buffer)->buffer[ (_buffer)->tail ] = (_ch); \
rtems_interrupt_enable( isrlevel ); \
rtems_interrupt_lock_release( &(_buffer)->lock, isrlevel ); \
} while ( 0 )
#define Ring_buffer_Remove_character( _buffer, _ch ) \
do { \
uint32_t isrlevel; \
rtems_interrupt_level isrlevel; \
\
rtems_interrupt_disable( isrlevel ); \
rtems_interrupt_lock_acquire( &(_buffer)->lock, isrlevel ); \
(_buffer)->head = ((_buffer)->head+1) % RINGBUF_QUEUE_LENGTH; \
(_ch) = (_buffer)->buffer[ (_buffer)->head ]; \
rtems_interrupt_enable( isrlevel ); \
rtems_interrupt_lock_release( &(_buffer)->lock, isrlevel ); \
} while ( 0 )
#endif