OpenModem/util/FIFO16.h
2019-01-08 20:56:58 +01:00

88 lines
1.7 KiB
C

#ifndef UTIL_FIFO16_H
#define UTIL_FIFO16_H
#include <stdio.h>
#include <stddef.h>
#include <stdbool.h>
#include <util/atomic.h>
typedef struct FIFOBuffer16
{
size_t *begin;
size_t *end;
size_t * volatile head;
size_t * volatile tail;
} FIFOBuffer16;
inline bool fifo16_isempty(const FIFOBuffer16 *f) {
return f->head == f->tail;
}
inline bool fifo16_isfull(const FIFOBuffer16 *f) {
return ((f->head == f->begin) && (f->tail == f->end)) || (f->tail == f->head - 1);
}
inline void fifo16_push(FIFOBuffer16 *f, size_t c) {
*(f->tail) = c;
if (f->tail == f->end) {
f->tail = f->begin;
} else {
f->tail++;
}
}
inline size_t fifo16_pop(FIFOBuffer16 *f) {
if(f->head == f->end) {
f->head = f->begin;
return *(f->end);
} else {
return *(f->head++);
}
}
inline void fifo16_flush(FIFOBuffer16 *f) {
f->head = f->tail;
}
static inline bool fifo16_isempty_locked(const FIFOBuffer16 *f) {
bool result;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
result = fifo16_isempty(f);
}
return result;
}
static inline bool fifo16_isfull_locked(const FIFOBuffer16 *f) {
bool result;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
result = fifo16_isfull(f);
}
return result;
}
static inline void fifo16_push_locked(FIFOBuffer16 *f, size_t c) {
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
fifo16_push(f, c);
}
}
static inline size_t fifo16_pop_locked(FIFOBuffer16 *f) {
size_t c;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
c = fifo16_pop(f);
}
return c;
}
inline void fifo16_init(FIFOBuffer16 *f, size_t *buffer, size_t size) {
f->head = f->tail = f->begin = buffer;
f->end = buffer + (size/sizeof(size_t)) - 2;
}
inline size_t fifo16_len(FIFOBuffer16 *f) {
return ((f->end - f->begin))/sizeof(size_t);
}
#endif