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kcall.h
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kcall.h
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/** ffsys: kernel call queue
2022, Simon Zolin */
/*
ffkcallq_process_sq
ffkcallq_process_cq
ffkcall_cancel
fffile_open_async
fffile_info_async
fffile_read_async fffile_write_async fffile_writeat_async
*/
#pragma once
#include <ffsys/file.h>
#include <ffsys/semaphore.h>
#include <ffsys/queue.h>
#include <ffsys/socket.h>
#include <ffsys/error.h>
#include <ffbase/ringqueue.h>
#include <assert.h>
#ifdef FF_WIN
#define FFKCALL_EINPROGRESS ERROR_IO_PENDING
#define FFKCALL_EBUSY ERROR_BUSY
#define FFKCALL_EAGAIN WSAEWOULDBLOCK
#else
#define FFKCALL_EINPROGRESS EINPROGRESS
#define FFKCALL_EBUSY EBUSY
#define FFKCALL_EAGAIN EAGAIN
#endif
struct ffkcallqueue {
ffringqueue *sq; // submission queue
ffsem sem; // triggerred on sq submit to wake sq reader thread (optional)
ffringqueue *cq; // completion queue
ffkq_postevent kqpost; // triggerred on cq submit to wake cq reader thread (optional)
void *kqpost_data;
};
typedef void (*kcall_func)(void *obj);
struct ffkcall {
struct ffkcallqueue *q;
kcall_func handler;
void *param;
ffushort op; // enum FFKCALL_OP
ffushort state; // 0, 1: in SQ, 2: in CQ
union {
struct {
ffuint error;
ffint64 result;
};
struct {
ffuint flags;
const char *name;
};
struct {
fffd fd_info;
fffileinfo *finfo;
};
struct {
fffd fd;
void* buf;
ffsize size;
ffuint64 offset;
};
};
};
enum FFKCALL_OP {
FFKCALL_FILE_OPEN = 1,
FFKCALL_FILE_INFO,
FFKCALL_FILE_READ,
FFKCALL_FILE_WRITE,
FFKCALL_FILE_WRITEAT,
FFKCALL_NET_RESOLVE,
};
static int _ffkcall_exec(struct ffkcall *kc)
{
switch (kc->op) {
case FFKCALL_FILE_OPEN:
kc->result = (ffssize)fffile_open(kc->name, kc->flags);
break;
case FFKCALL_FILE_INFO:
kc->result = fffile_info(kc->fd, kc->finfo);
break;
case FFKCALL_FILE_READ:
kc->result = fffile_read(kc->fd, kc->buf, kc->size);
break;
case FFKCALL_FILE_WRITE:
kc->result = fffile_write(kc->fd, kc->buf, kc->size);
break;
case FFKCALL_FILE_WRITEAT:
kc->result = fffile_writeat(kc->fd, kc->buf, kc->size, kc->offset);
break;
case FFKCALL_NET_RESOLVE:
kc->result = (ffsize)ffaddrinfo_resolve(kc->name, kc->flags);
break;
default:
return -1;
}
kc->error = fferr_last();
return 0;
}
/** Process the submission queue, perform operations, store result in completion queue */
static inline void ffkcallq_process_sq(ffringqueue *sq)
{
struct ffkcall *kc;
for (;;) {
if (0 != ffrq_fetch(sq, (void**)&kc, NULL))
break;
if (ff_unlikely(0 != _ffkcall_exec(kc))) {
kc->state = 0;
continue;
}
kc->state = 2;
ffuint used;
if (ff_unlikely(0 != ffrq_add(kc->q->cq, kc, &used))) {
assert(0);
continue;
}
if (used == 0 && kc->q->kqpost != FFKQ_NULL) {
if (ff_unlikely(0 != ffkq_post(kc->q->kqpost, kc->q->kqpost_data)))
assert(0);
}
}
}
/** Process the completion queue, call a result handling function */
static inline void ffkcallq_process_cq(ffringqueue *cq)
{
struct ffkcall *kc;
for (;;) {
if (0 != ffrq_fetch_sr(cq, (void**)&kc, NULL))
break;
kc->state = 0;
if (kc->op != 0)
kc->handler(kc->param);
}
}
static inline void ffkcall_cancel(struct ffkcall *kc)
{
kc->op = 0;
}
static inline void _ffkcall_add(struct ffkcall *kc, int op)
{
kc->op = op;
ffuint used;
if (0 != ffrq_add(kc->q->sq, kc, &used)) {
kc->op = 0;
fferr_set(FFKCALL_EAGAIN);
return;
}
if (kc->q->sem != FFSEM_NULL) {
ffsem_post(kc->q->sem);
}
fferr_set(FFKCALL_EINPROGRESS);
}
static int _ffkcall_busy(struct ffkcall *kc)
{
if (kc->state != 0) {
// the previous operation is still active in SQ or CQ
fferr_set(FFKCALL_EBUSY);
return 1;
}
return 0;
}
static int _ffkcall_complete(struct ffkcall *kc)
{
if (kc->op != 0) {
kc->op = 0;
fferr_set(kc->error);
return 1;
}
return 0;
}
static inline fffd fffile_open_async(const char *name, ffuint flags, struct ffkcall *kc)
{
if (kc->q == NULL)
return fffile_open(name, flags);
if (_ffkcall_busy(kc))
return FFFILE_NULL;
if (_ffkcall_complete(kc))
return (fffd)(ffssize)kc->result;
kc->name = name;
kc->flags = flags;
_ffkcall_add(kc, FFKCALL_FILE_OPEN);
return FFFILE_NULL;
}
static inline int fffile_info_async(fffd fd, fffileinfo *fi, struct ffkcall *kc)
{
if (kc->q == NULL)
return fffile_info(fd, fi);
if (_ffkcall_busy(kc))
return -1;
if (_ffkcall_complete(kc))
return kc->result;
kc->fd = fd;
kc->finfo = fi;
_ffkcall_add(kc, FFKCALL_FILE_INFO);
return -1;
}
static inline ffssize fffile_read_async(fffd fd, void *buf, ffsize size, struct ffkcall *kc)
{
if (kc->q == NULL)
return fffile_read(fd, buf, size);
if (_ffkcall_busy(kc))
return -1;
if (_ffkcall_complete(kc))
return kc->result;
kc->fd = fd;
kc->buf = buf;
kc->size = size;
_ffkcall_add(kc, FFKCALL_FILE_READ);
return -1;
}
static inline ffssize fffile_write_async(fffd fd, const void *buf, ffsize size, struct ffkcall *kc)
{
if (kc->q == NULL)
return fffile_write(fd, buf, size);
if (_ffkcall_busy(kc))
return -1;
if (_ffkcall_complete(kc))
return kc->result;
kc->fd = fd;
kc->buf = (void*)buf;
kc->size = size;
_ffkcall_add(kc, FFKCALL_FILE_WRITE);
return -1;
}
static inline ffssize fffile_writeat_async(fffd fd, const void *buf, ffsize size, ffuint64 offset, struct ffkcall *kc)
{
if (kc->q == NULL)
return fffile_writeat(fd, buf, size, offset);
if (_ffkcall_busy(kc))
return -1;
if (_ffkcall_complete(kc))
return kc->result;
kc->fd = fd;
kc->buf = (void*)buf;
kc->size = size;
kc->offset = offset;
_ffkcall_add(kc, FFKCALL_FILE_WRITEAT);
return -1;
}
static inline ffaddrinfo* ffaddrinfo_resolve_async(const char *name, int flags, struct ffkcall *kc)
{
if (kc->q == NULL)
return ffaddrinfo_resolve(name, flags);
if (_ffkcall_busy(kc))
return NULL;
if (_ffkcall_complete(kc))
return (ffaddrinfo*)kc->result;
kc->name = name;
kc->flags = flags;
_ffkcall_add(kc, FFKCALL_NET_RESOLVE);
return NULL;
}