Simple IPC with pipes
This commit is contained in:
37
kernel/rbuf/rbuf.c
Normal file
37
kernel/rbuf/rbuf.c
Normal file
@ -0,0 +1,37 @@
|
||||
#include <stdint.h>
|
||||
#include <stddef.h>
|
||||
#include "rbuf.h"
|
||||
|
||||
int32_t rbuf_push(RBuf *rbuf, uint8_t data) {
|
||||
size_t next;
|
||||
|
||||
next = rbuf->head + 1;
|
||||
if (next >= rbuf->cap) {
|
||||
next = 0;
|
||||
}
|
||||
|
||||
if (next == rbuf->tail) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
rbuf->buffer[rbuf->head] = data;
|
||||
rbuf->head = next;
|
||||
return 0;
|
||||
}
|
||||
|
||||
int32_t rbuf_pop(RBuf *rbuf, uint8_t *data) {
|
||||
size_t next;
|
||||
|
||||
if (rbuf->head == rbuf->tail) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
next = rbuf->tail + 1;
|
||||
if (next >= rbuf->cap) {
|
||||
next = 0;
|
||||
}
|
||||
|
||||
*data = rbuf->buffer[rbuf->tail];
|
||||
rbuf->tail = next;
|
||||
return 0;
|
||||
}
|
Reference in New Issue
Block a user