Add locked ring buffer

This commit is contained in:
Mathieu Maret 2021-11-09 20:35:55 +01:00
parent c3b4d65a36
commit d1994d44a3
4 changed files with 181 additions and 15 deletions

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@ -1,6 +1,7 @@
#include "alloc.h"
#include "klibc.h"
#include "ringbuffer.h"
#include "synchro.h"
struct ringbuffer_instance_t {
int32_t wr_pos;
@ -12,12 +13,18 @@ struct ringbuffer_instance_t {
ringbuffer_t ringbufferCreate(uint32_t capacity)
{
ringbuffer_t inst = zalloc(1* sizeof(struct ringbuffer_instance_t));
inst->data = zalloc(capacity * sizeof(uint8_t));
inst->capacity = capacity;
inst->wr_pos = 0;
inst->rd_pos = 0;
inst->full = capacity == 0;
ringbuffer_t inst = zalloc(1 * sizeof(struct ringbuffer_instance_t));
if (inst == NULL)
return NULL;
inst->data = zalloc(capacity * sizeof(uint8_t));
if (inst->data == NULL) {
free(inst);
return NULL;
}
inst->capacity = capacity;
inst->wr_pos = 0;
inst->rd_pos = 0;
inst->full = capacity == 0;
return inst;
}
@ -35,19 +42,19 @@ uint32_t ringbufferUsed(ringbuffer_t instance)
return (instance->wr_pos - instance->rd_pos) % instance->capacity;
}
bool_t ringbufferEmpty(ringbuffer_t instance)
bool_t ringbufferIsEmpty(ringbuffer_t instance)
{
return (!instance->full && (instance->wr_pos == instance->rd_pos));
}
bool_t ringbufferFull(ringbuffer_t instance)
bool_t ringbufferIsFull(ringbuffer_t instance)
{
return instance->full;
}
bool_t ringbufferEnqueue(ringbuffer_t instance, uint8_t item)
{
if (ringbufferFull(instance))
if (ringbufferIsFull(instance))
return FALSE;
instance->data[instance->wr_pos] = item;
@ -60,7 +67,7 @@ bool_t ringbufferEnqueue(ringbuffer_t instance, uint8_t item)
bool_t ringbufferDequeue(ringbuffer_t instance, uint8_t *item)
{
if (ringbufferEmpty(instance))
if (ringbufferIsEmpty(instance))
return FALSE;
instance->full = FALSE;
@ -85,3 +92,93 @@ void ringbufferDebug(ringbuffer_t instance)
printf("%d/%d %d %d %s\n", ringbufferUsed(instance), ringbufferCapacity(instance),
instance->wr_pos, instance->rd_pos, instance->full ? "(full)" : "");
}
struct locked_ringbuffer_instance_t {
struct ringbuffer_instance_t *ring;
struct mutex mut;
};
locked_ringbuffer_t lringbufferCreate(uint32_t capacity)
{
locked_ringbuffer_t inst = zalloc(sizeof(locked_ringbuffer_t));
if (inst == NULL)
return NULL;
inst->ring = ringbufferCreate(capacity);
if (inst->ring == NULL) {
free(inst);
return NULL;
}
mutexInit(&inst->mut);
return inst;
}
uint32_t lringbufferCapacity(locked_ringbuffer_t instance)
{
return instance->ring->capacity;
}
uint32_t lringbufferUsed(locked_ringbuffer_t instance)
{
int used;
mutexLock(&instance->mut);
used = ringbufferUsed(instance->ring);
mutexUnlock(&instance->mut);
return used;
}
bool_t lringbufferEnqueue(locked_ringbuffer_t instance, uint8_t item)
{
int ret;
mutexLock(&instance->mut);
ret = ringbufferEnqueue(instance->ring, item);
mutexUnlock(&instance->mut);
return ret;
}
bool_t lringbufferDequeue(locked_ringbuffer_t instance, uint8_t *item)
{
int ret;
mutexLock(&instance->mut);
ret = ringbufferDequeue(instance->ring, item);
mutexUnlock(&instance->mut);
return ret;
}
void lringbufferDestroy(locked_ringbuffer_t instance){
mutexFree(&instance->mut);
ringbufferDestroy(instance->ring);
instance->ring = NULL;
free(instance);
}
void lringbufferDebug(locked_ringbuffer_t instance)
{
mutexLock(&instance->mut);
ringbufferDebug(instance->ring);
mutexUnlock(&instance->mut);
}
bool_t lringbufferIsEmpty(locked_ringbuffer_t instance)
{
bool_t ret;
mutexLock(&instance->mut);
ret = ringbufferIsEmpty(instance->ring);
mutexUnlock(&instance->mut);
return ret;
}
bool_t lringbufferIsFull(locked_ringbuffer_t instance)
{
bool_t ret;
mutexLock(&instance->mut);
ret = ringbufferIsFull(instance->ring);
mutexUnlock(&instance->mut);
return ret;
}

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@ -1,15 +1,27 @@
#pragma once
#include "stdarg.h"
#include "wait.h"
typedef struct ringbuffer_instance_t* ringbuffer_t;
typedef struct ringbuffer_instance_t *ringbuffer_t;
ringbuffer_t ringbufferCreate(uint32_t capacity);
uint32_t ringbufferCapacity(ringbuffer_t instance);
uint32_t ringbufferUsed(ringbuffer_t instance);
bool_t ringbufferEnqueue(ringbuffer_t instance, uint8_t item);
bool_t ringbufferDequeue(ringbuffer_t instance, uint8_t* item);
bool_t ringbufferDequeue(ringbuffer_t instance, uint8_t *item);
void ringbufferDestroy(ringbuffer_t instance);
void ringbufferDebug(ringbuffer_t instance);
bool_t ringbufferEmpty(ringbuffer_t instance);
bool_t ringbufferFull(ringbuffer_t instance);
bool_t ringbufferIsEmpty(ringbuffer_t instance);
bool_t ringbufferIsFull(ringbuffer_t instance);
typedef struct locked_ringbuffer_instance_t *locked_ringbuffer_t;
locked_ringbuffer_t lringbufferCreate(uint32_t capacity);
uint32_t lringbufferCapacity(locked_ringbuffer_t instance);
uint32_t lringbufferUsed(locked_ringbuffer_t instance);
bool_t lringbufferEnqueue(locked_ringbuffer_t instance, uint8_t item);
bool_t lringbufferDequeue(locked_ringbuffer_t instance, uint8_t *item);
void lringbufferDestroy(locked_ringbuffer_t instance);
void lringbufferDebug(locked_ringbuffer_t instance);
bool_t lringbufferIsEmpty(locked_ringbuffer_t instance);
bool_t lringbufferIsFull(locked_ringbuffer_t instance);

52
core/uaccess.c Normal file
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@ -0,0 +1,52 @@
#include "assert.h"
#include "mmuContext.h"
#include "paging.h"
#include "thread.h"
#include "uaccess.h"
static int bindtoUserContext()
{
struct thread *currentThread;
struct mmu_context *ctx;
currentThread = getCurrentThread();
assert(NULL != currentThread->process);
/* Switch to the user's address space */
ctx = processGetMMUContext(currentThread->process);
return threadChangeCurrentContext(ctx);
}
static int unbindUserContext()
{
return threadChangeCurrentContext(NULL);
}
static int memcpyUserMemNoCheck(vaddr_t dest, vaddr_t src, size_t size)
{
int ret;
ret = bindtoUserContext();
if (ret != 0)
return ret;
memcpy((void *)dest, (void *)src, size);
ret = unbindUserContext();
if (ret != 0)
return ret;
return size;
}
int memcpyFromUser(vaddr_t to, uaddr_t from, size_t size)
{
if ((uint)from < PAGING_BASE_USER_ADDRESS)
return -EPERM;
if ((uint)from > PAGING_TOP_USER_ADDRESS - size)
return -EPERM;
return memcpyUserMemNoCheck(to, from, size);
}

5
core/uaccess.h Normal file
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@ -0,0 +1,5 @@
#pragma once
#include "types.h"
#include "stdarg.h"
int memcpyFromUser(vaddr_t to, uaddr_t from, size_t size);