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rt-thread/components/lwp/lwp_ipc.c

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/*
* Copyright (c) 2006-2020, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2019-10-12 Jesven first version
*/
#include <rtthread.h>
#include <rthw.h>
#include <lwp.h>
#include "lwp_ipc.h"
#include "lwp_ipc_internal.h"
#include <dfs_file.h>
#include <poll.h>
/**
* the IPC channel states
*/
enum
{
RT_IPC_STAT_IDLE, /* no suspended threads */
RT_IPC_STAT_WAIT, /* suspended receivers exist */
RT_IPC_STAT_ACTIVE, /* suspended senders exist */
};
/**
* IPC message structure.
*
* They are allocated and released in the similar way like 'rt_chfd'.
*/
struct rt_ipc_msg
{
struct rt_channel_msg msg; /**< the payload of msg */
rt_list_t mlist; /**< the msg list */
rt_uint8_t need_reply; /**< whether msg wait reply*/
};
typedef struct rt_ipc_msg *rt_ipc_msg_t;
static rt_ipc_msg_t _ipc_msg_free_list = (rt_ipc_msg_t)RT_NULL; /* released chain */
static int rt_ipc_msg_used = 0; /* first unallocated entry */
static struct rt_ipc_msg ipc_msg_pool[RT_CH_MSG_MAX_NR]; /* initial message array */
/**
* Allocate an IPC message from the statically-allocated array.
*/
static rt_ipc_msg_t _ipc_msg_alloc(void)
{
rt_ipc_msg_t p = (rt_ipc_msg_t)RT_NULL;
if (_ipc_msg_free_list) /* use the released chain first */
{
p = _ipc_msg_free_list;
_ipc_msg_free_list = (rt_ipc_msg_t)p->msg.sender; /* emtry payload as a pointer */
}
else if (rt_ipc_msg_used < RT_CH_MSG_MAX_NR)
{
p = &ipc_msg_pool[rt_ipc_msg_used];
rt_ipc_msg_used++;
}
return p;
}
/**
* Put a released IPC message back to the released chain.
*/
static void _ipc_msg_free(rt_ipc_msg_t p_msg)
{
p_msg->msg.sender = (void*)_ipc_msg_free_list;
_ipc_msg_free_list = p_msg;
}
/**
* Initialized the IPC message.
*/
static void rt_ipc_msg_init(rt_ipc_msg_t msg, struct rt_channel_msg *data, rt_uint8_t need_reply)
{
RT_ASSERT(msg != RT_NULL);
msg->need_reply = need_reply;
msg->msg = *data;
msg->msg.sender = (void*)rt_thread_self();
rt_list_init(&msg->mlist);
}
/**
* Initialized the list of the waiting receivers on the IPC channel.
*/
rt_inline rt_err_t rt_channel_object_init(struct rt_ipc_object *ipc)
{
rt_list_init(&(ipc->suspend_thread)); /* receiver list */
return RT_EOK;
}
/**
* Wakeup the first suspened thread in the list.
*/
rt_inline rt_err_t rt_channel_list_resume(rt_list_t *list)
{
struct rt_thread *thread;
/* get the first thread entry waiting for sending */
thread = rt_list_entry(list->next, struct rt_thread, tlist);
rt_thread_resume(thread);
return RT_EOK;
}
/**
* Wakeup all the suspended threads in the list.
*/
rt_inline rt_err_t rt_channel_list_resume_all(rt_list_t *list)
{
struct rt_thread *thread;
register rt_ubase_t temp;
/* wakeup all suspended threads for sending */
while (!rt_list_isempty(list))
{
temp = rt_hw_interrupt_disable();
thread = rt_list_entry(list->next, struct rt_thread, tlist);
thread->error = -RT_ERROR;
rt_thread_resume(thread);
rt_hw_interrupt_enable(temp);
}
return RT_EOK;
}
/**
* Suspend the thread and chain it into the end of the list.
*/
rt_inline rt_err_t rt_channel_list_suspend(rt_list_t *list, struct rt_thread *thread)
{
/* suspend thread */
rt_err_t ret = rt_thread_suspend_with_flag(thread, RT_INTERRUPTIBLE);
if (ret == RT_EOK)
{
rt_list_insert_before(list, &(thread->tlist)); /* list end */
}
return ret;
}
static void _rt_channel_check_wq_wakup(rt_channel_t ch)
{
rt_base_t level;
level = rt_hw_interrupt_disable();
if (rt_list_isempty(&ch->wait_msg))
{
rt_hw_interrupt_enable(level);
return;
}
rt_wqueue_wakeup(&ch->reader_queue, 0);
rt_hw_interrupt_enable(level);
}
/**
* Create a new or open an existing IPC channel.
*/
rt_channel_t rt_raw_channel_open(const char *name, int flags)
{
register rt_ubase_t temp = 0;
rt_channel_t ch = RT_NULL;
struct rt_object *object;
struct rt_list_node *node;
struct rt_object_information *information;
temp = rt_hw_interrupt_disable();
information = rt_object_get_information(RT_Object_Class_Channel);
RT_ASSERT(information != RT_NULL);
/* retrieve the existing IPC channels */
for (node = information->object_list.next;
node != &(information->object_list);
node = node->next)
{
object = rt_list_entry(node, struct rt_object, list);
if (rt_strncmp(object->name, name, RT_NAME_MAX) == 0)
{
if ((flags & O_CREAT) && (flags & O_EXCL))
{
goto quit;
}
/* find the IPC channel with the specific name */
ch = (rt_channel_t)object;
ch->ref++; /* increase the reference count */
break;
}
}
if (!ch) /* create a new IPC channel */
{
if (flags & O_CREAT)
{
RT_DEBUG_NOT_IN_INTERRUPT;
/* allocate a real IPC channel structure */
ch = (rt_channel_t)rt_object_allocate(RT_Object_Class_Channel, name);
}
if (!ch)
{
goto quit;
}
rt_channel_object_init(&ch->parent); /* suspended receivers */
rt_list_init(&ch->wait_msg); /* unhandled messages */
rt_list_init(&ch->wait_thread); /* suspended senders */
rt_wqueue_init(&ch->reader_queue); /* reader poll queue */
ch->reply = RT_NULL;
ch->stat = RT_IPC_STAT_IDLE; /* no suspended threads */
ch->ref = 1;
}
quit:
rt_hw_interrupt_enable(temp);
return ch;
}
/**
* Close an existiong IPC channel, release the resources.
*/
rt_err_t rt_raw_channel_close(rt_channel_t ch)
{
register rt_ubase_t temp;
RT_DEBUG_NOT_IN_INTERRUPT;
if (ch == RT_NULL)
{
return -RT_EIO;
}
temp = rt_hw_interrupt_disable();
if (rt_object_get_type(&ch->parent.parent) != RT_Object_Class_Channel)
{
rt_hw_interrupt_enable(temp);
return -RT_EIO;
}
if (rt_object_is_systemobject(&ch->parent.parent) != RT_FALSE)
{
rt_hw_interrupt_enable(temp);
return -RT_EIO;
}
if (ch->ref == 0)
{
rt_hw_interrupt_enable(temp);
return -RT_EIO;
}
ch->ref--;
if (ch->ref == 0)
{
/* wakeup all the suspended receivers and senders */
rt_channel_list_resume_all(&ch->parent.suspend_thread);
rt_channel_list_resume_all(&ch->wait_thread);
/* all ipc msg will lost */
rt_list_init(&ch->wait_msg);
rt_object_delete(&ch->parent.parent); /* release the IPC channel structure */
}
rt_hw_interrupt_enable(temp);
return RT_EOK;
}
static rt_err_t wakeup_sender_wait_recv(void *object, struct rt_thread *thread)
{
rt_channel_t ch;
ch = (rt_channel_t)object;
if (ch->stat == RT_IPC_STAT_ACTIVE && ch->reply == thread)
{
ch->stat = RT_IPC_STAT_IDLE;
ch->reply = RT_NULL;
}
else
{
rt_ipc_msg_t msg;
rt_list_t *l;
l = ch->wait_msg.next;
while (l != &ch->wait_msg)
{
msg = rt_list_entry(l, struct rt_ipc_msg, mlist);
if (msg->need_reply && msg->msg.sender == thread)
{
rt_list_remove(&msg->mlist); /* remove the msg from the channel */
_ipc_msg_free(msg);
break;
}
l = l->next;
}
}
thread->error = -RT_EINTR;
return rt_thread_resume(thread); /* wake up the sender */
}
static rt_err_t wakeup_sender_wait_reply(void *object, struct rt_thread *thread)
{
rt_channel_t ch;
ch = (rt_channel_t)object;
RT_ASSERT(ch->stat == RT_IPC_STAT_ACTIVE && ch->reply == thread);
ch->stat = RT_IPC_STAT_IDLE;
ch->reply = RT_NULL;
thread->error = -RT_EINTR;
return rt_thread_resume(thread); /* wake up the sender */
}
static void sender_timeout(void *parameter)
{
struct rt_thread *thread = (struct rt_thread*)parameter;
rt_channel_t ch;
ch = (rt_channel_t)(thread->wakeup.user_data);
if (ch->stat == RT_IPC_STAT_ACTIVE && ch->reply == thread)
{
ch->stat = RT_IPC_STAT_IDLE;
ch->reply = RT_NULL;
}
else
{
rt_ipc_msg_t msg;
rt_list_t *l;
l = ch->wait_msg.next;
while (l != &ch->wait_msg)
{
msg = rt_list_entry(l, struct rt_ipc_msg, mlist);
if (msg->need_reply && msg->msg.sender == thread)
{
rt_list_remove(&msg->mlist); /* remove the msg from the channel */
_ipc_msg_free(msg);
break;
}
l = l->next;
}
}
thread->error = -RT_ETIMEOUT;
thread->wakeup.func = RT_NULL;
rt_list_remove(&(thread->tlist));
/* insert to schedule ready list */
rt_schedule_insert_thread(thread);
/* do schedule */
rt_schedule();
}
/**
* Get file vnode from fd.
*/
static void *_ipc_msg_get_file(int fd)
{
struct dfs_file *d;
d = fd_get(fd);
if (d == RT_NULL)
return RT_NULL;
if (!d->vnode)
return RT_NULL;
d->vnode->ref_count++;
return (void *)d->vnode;
}
/**
* Get fd from file vnode.
*/
static int _ipc_msg_fd_new(void *file)
{
int fd;
struct dfs_file *d;
fd = fd_new();
if (fd < 0)
{
return -1;
}
d = fd_get(fd);
if (!d)
{
fd_release(fd);
return -1;
}
d->vnode = (struct dfs_vnode *)file;
d->flags = O_RDWR; /* set flags as read and write */
return fd;
}
/**
* Send data through an IPC channel, wait for the reply or not.
*/
static rt_err_t _rt_raw_channel_send_recv_timeout(rt_channel_t ch, rt_channel_msg_t data, int need_reply, rt_channel_msg_t data_ret, rt_int32_t time)
{
rt_ipc_msg_t msg;
struct rt_thread *thread_recv, *thread_send = 0;
register rt_base_t temp;
rt_err_t ret;
void (*old_timeout_func)(void *) = 0;
if (need_reply)
{
RT_DEBUG_NOT_IN_INTERRUPT;
}
if (ch == RT_NULL)
{
return -RT_EIO;
}
temp = rt_hw_interrupt_disable();
if (rt_object_get_type(&ch->parent.parent) != RT_Object_Class_Channel)
{
rt_hw_interrupt_enable(temp);
return -RT_EIO;
}
if (need_reply && time == 0)
{
rt_hw_interrupt_enable(temp);
return -RT_ETIMEOUT;
}
/* allocate an IPC message */
msg = _ipc_msg_alloc();
if (!msg)
{
rt_hw_interrupt_enable(temp);
return -RT_ENOMEM;
}
/* IPC message : file descriptor */
if (data->type == RT_CHANNEL_FD)
{
data->u.fd.file = _ipc_msg_get_file(data->u.fd.fd);
}
rt_ipc_msg_init(msg, data, need_reply);
if (need_reply)
{
thread_send = rt_thread_self();
thread_send->error = RT_EOK;
}
switch (ch->stat)
{
case RT_IPC_STAT_IDLE:
case RT_IPC_STAT_ACTIVE:
if (need_reply)
{
ret = rt_channel_list_suspend(&ch->wait_thread, thread_send);
if (ret != RT_EOK)
{
_ipc_msg_free(msg);
rt_hw_interrupt_enable(temp);
return ret;
}
rt_thread_wakeup_set(thread_send, wakeup_sender_wait_recv, (void*)ch);
if (time > 0)
{
rt_timer_control(&(thread_send->thread_timer),
RT_TIMER_CTRL_GET_FUNC,
&old_timeout_func);
rt_timer_control(&(thread_send->thread_timer),
RT_TIMER_CTRL_SET_FUNC,
sender_timeout);
/* reset the timeout of thread timer and start it */
rt_timer_control(&(thread_send->thread_timer),
RT_TIMER_CTRL_SET_TIME,
&time);
rt_timer_start(&(thread_send->thread_timer));
}
}
/*
* If there is no thread waiting for messages, chain the message
* into the list.
*/
rt_list_insert_before(&ch->wait_msg, &msg->mlist);
break;
case RT_IPC_STAT_WAIT:
/*
* If there are suspended receivers on the IPC channel, transfer the
* pointer of the message to the first receiver directly and wake it
* up.
*/
RT_ASSERT(ch->parent.suspend_thread.next != &ch->parent.suspend_thread);
if (need_reply)
{
ret = rt_channel_list_suspend(&ch->wait_thread, thread_send);
if (ret != RT_EOK)
{
_ipc_msg_free(msg);
rt_hw_interrupt_enable(temp);
return ret;
}
ch->reply = thread_send; /* record the current waiting sender */
ch->stat = RT_IPC_STAT_ACTIVE;
rt_thread_wakeup_set(thread_send, wakeup_sender_wait_reply, (void*)ch);
if (time > 0)
{
rt_timer_control(&(thread_send->thread_timer),
RT_TIMER_CTRL_GET_FUNC,
&old_timeout_func);
rt_timer_control(&(thread_send->thread_timer),
RT_TIMER_CTRL_SET_FUNC,
sender_timeout);
/* reset the timeout of thread timer and start it */
rt_timer_control(&(thread_send->thread_timer),
RT_TIMER_CTRL_SET_TIME,
&time);
rt_timer_start(&(thread_send->thread_timer));
}
}
else
{
ch->stat = RT_IPC_STAT_IDLE;
}
thread_recv = rt_list_entry(ch->parent.suspend_thread.next, struct rt_thread, tlist);
thread_recv->msg_ret = msg; /* to the first suspended receiver */
thread_recv->error = RT_EOK;
rt_channel_list_resume(&ch->parent.suspend_thread);
break;
default:
break;
}
if ( ch->stat == RT_IPC_STAT_IDLE)
{
_rt_channel_check_wq_wakup(ch);
}
rt_hw_interrupt_enable(temp);
/* reschedule in order to let the potential receivers run */
rt_schedule();
if (need_reply)
{
temp = rt_hw_interrupt_disable();
if (old_timeout_func)
{
rt_timer_control(&(thread_send->thread_timer),
RT_TIMER_CTRL_SET_FUNC,
old_timeout_func);
}
ret = thread_send->error;
rt_hw_interrupt_enable(temp);
if (ret != RT_EOK)
{
return ret;
}
/* If the sender gets the chance to run, the requested reply must be valid. */
RT_ASSERT(data_ret != RT_NULL);
*data_ret = ((rt_ipc_msg_t)(thread_send->msg_ret))->msg; /* extract data */
temp = rt_hw_interrupt_disable();
_ipc_msg_free(thread_send->msg_ret); /* put back the message to kernel */
rt_hw_interrupt_enable(temp);
thread_send->msg_ret = RT_NULL;
}
return RT_EOK;
}
/**
* Send data through an IPC channel with no reply.
*/
rt_err_t rt_raw_channel_send(rt_channel_t ch, rt_channel_msg_t data)
{
return _rt_raw_channel_send_recv_timeout(ch, data, 0, 0, RT_WAITING_FOREVER);
}
/**
* Send data through an IPC channel and wait for the relpy.
*/
rt_err_t rt_raw_channel_send_recv(rt_channel_t ch, rt_channel_msg_t data, rt_channel_msg_t data_ret)
{
return _rt_raw_channel_send_recv_timeout(ch, data, 1, data_ret, RT_WAITING_FOREVER);
}
/**
* Send data through an IPC channel and wait for the relpy.
*/
rt_err_t rt_raw_channel_send_recv_timeout(rt_channel_t ch, rt_channel_msg_t data, rt_channel_msg_t data_ret, rt_int32_t time)
{
return _rt_raw_channel_send_recv_timeout(ch, data, 1, data_ret, time);
}
/**
* Reply to the waiting sender and wake it up.
*/
rt_err_t rt_raw_channel_reply(rt_channel_t ch, rt_channel_msg_t data)
{
rt_ipc_msg_t msg;
struct rt_thread *thread;
register rt_base_t temp;
if (ch == RT_NULL)
{
return -RT_EIO;
}
temp = rt_hw_interrupt_disable();
if (rt_object_get_type(&ch->parent.parent) != RT_Object_Class_Channel)
{
rt_hw_interrupt_enable(temp);
return -RT_EIO;
}
if (ch->stat != RT_IPC_STAT_ACTIVE)
{
rt_hw_interrupt_enable(temp);
return -RT_ERROR;
}
if (ch->reply == RT_NULL)
{
rt_hw_interrupt_enable(temp);
return -RT_ERROR;
}
/* allocate an IPC message */
msg = _ipc_msg_alloc();
if (!msg)
{
rt_hw_interrupt_enable(temp);
return -RT_ENOMEM;
}
rt_ipc_msg_init(msg, data, 0);
thread = ch->reply;
thread->msg_ret = msg; /* transfer the reply to the sender */
rt_thread_resume(thread); /* wake up the sender */
ch->stat = RT_IPC_STAT_IDLE;
ch->reply = RT_NULL;
_rt_channel_check_wq_wakup(ch);
rt_hw_interrupt_enable(temp);
rt_schedule();
return RT_EOK;
}
static rt_err_t wakeup_receiver(void *object, struct rt_thread *thread)
{
rt_channel_t ch;
rt_err_t ret;
ch = (rt_channel_t)object;
ch->stat = RT_IPC_STAT_IDLE;
thread->error = -RT_EINTR;
ret = rt_channel_list_resume(&ch->parent.suspend_thread);
_rt_channel_check_wq_wakup(ch);
return ret;
}
static void receiver_timeout(void *parameter)
{
struct rt_thread *thread = (struct rt_thread*)parameter;
rt_channel_t ch;
ch = (rt_channel_t)(thread->wakeup.user_data);
ch->stat = RT_IPC_STAT_IDLE;
thread->error = -RT_ETIMEOUT;
thread->wakeup.func = RT_NULL;
rt_list_remove(&(thread->tlist));
/* insert to schedule ready list */
rt_schedule_insert_thread(thread);
_rt_channel_check_wq_wakup(ch);
/* do schedule */
rt_schedule();
}
/**
* Fetch a message from the specified IPC channel.
*/
static rt_err_t _rt_raw_channel_recv_timeout(rt_channel_t ch, rt_channel_msg_t data, rt_int32_t time)
{
struct rt_thread *thread;
rt_ipc_msg_t msg_ret;
register rt_base_t temp;
rt_err_t ret;
void (*old_timeout_func)(void *) = 0;
RT_DEBUG_NOT_IN_INTERRUPT;
if (ch == RT_NULL)
{
return -RT_EIO;
}
temp = rt_hw_interrupt_disable();
if (rt_object_get_type(&ch->parent.parent) != RT_Object_Class_Channel)
{
rt_hw_interrupt_enable(temp);
return -RT_EIO;
}
if (ch->stat != RT_IPC_STAT_IDLE)
{
rt_hw_interrupt_enable(temp);
return -RT_ERROR;
}
if (ch->wait_msg.next != &ch->wait_msg) /* there exist unhandled messages */
{
msg_ret = rt_list_entry(ch->wait_msg.next, struct rt_ipc_msg, mlist);
rt_list_remove(ch->wait_msg.next); /* remove the message from the channel */
if (msg_ret->need_reply)
{
RT_ASSERT(ch->wait_thread.next != &ch->wait_thread);
thread = rt_list_entry(ch->wait_thread.next, struct rt_thread, tlist);
rt_list_remove(ch->wait_thread.next);
ch->reply = thread; /* record the waiting sender */
ch->stat = RT_IPC_STAT_ACTIVE; /* no valid suspened receivers */
}
*data = msg_ret->msg; /* extract the transferred data */
if (data->type == RT_CHANNEL_FD)
{
data->u.fd.fd = _ipc_msg_fd_new(data->u.fd.file);
}
_ipc_msg_free(msg_ret); /* put back the message to kernel */
}
else
{
if (time == 0)
{
rt_hw_interrupt_enable(temp);
return -RT_ETIMEOUT;
}
/* no valid message, we must wait */
thread = rt_thread_self();
ret = rt_channel_list_suspend(&ch->parent.suspend_thread, thread);
if (ret != RT_EOK)
{
rt_hw_interrupt_enable(temp);
return ret;
}
rt_thread_wakeup_set(thread, wakeup_receiver, (void*)ch);
ch->stat = RT_IPC_STAT_WAIT;/* no valid suspended senders */
thread->error = RT_EOK;
if (time > 0)
{
rt_timer_control(&(thread->thread_timer),
RT_TIMER_CTRL_GET_FUNC,
&old_timeout_func);
rt_timer_control(&(thread->thread_timer),
RT_TIMER_CTRL_SET_FUNC,
receiver_timeout);
/* reset the timeout of thread timer and start it */
rt_timer_control(&(thread->thread_timer),
RT_TIMER_CTRL_SET_TIME,
&time);
rt_timer_start(&(thread->thread_timer));
}
rt_hw_interrupt_enable(temp);
rt_schedule(); /* let the senders run */
temp = rt_hw_interrupt_disable();
if (old_timeout_func)
{
rt_timer_control(&(thread->thread_timer),
RT_TIMER_CTRL_SET_FUNC,
old_timeout_func);
}
ret = thread->error;
if ( ret != RT_EOK)
{
rt_hw_interrupt_enable(temp);
return ret;
}
/* If waked up, the received message has been store into the thread. */
*data = ((rt_ipc_msg_t)(thread->msg_ret))->msg; /* extract data */
if (data->type == RT_CHANNEL_FD)
{
data->u.fd.fd = _ipc_msg_fd_new(data->u.fd.file);
}
_ipc_msg_free(thread->msg_ret); /* put back the message to kernel */
thread->msg_ret = RT_NULL;
}
rt_hw_interrupt_enable(temp);
return RT_EOK;
}
rt_err_t rt_raw_channel_recv(rt_channel_t ch, rt_channel_msg_t data)
{
return _rt_raw_channel_recv_timeout(ch, data, RT_WAITING_FOREVER);
}
rt_err_t rt_raw_channel_recv_timeout(rt_channel_t ch, rt_channel_msg_t data, rt_int32_t time)
{
return _rt_raw_channel_recv_timeout(ch, data, time);
}
/**
* Peek a message from the specified IPC channel.
*/
rt_err_t rt_raw_channel_peek(rt_channel_t ch, rt_channel_msg_t data)
{
return _rt_raw_channel_recv_timeout(ch, data, 0);
}
/* for API */
static int lwp_fd_new(int fdt_type)
{
struct dfs_fdtable *fdt;
if (fdt_type)
{
fdt = dfs_fdtable_get_global();
}
else
{
fdt = dfs_fdtable_get();
}
return fdt_fd_new(fdt);
}
static struct dfs_file *lwp_fd_get(int fdt_type, int fd)
{
struct dfs_fdtable *fdt;
if (fdt_type)
{
fdt = dfs_fdtable_get_global();
}
else
{
fdt = dfs_fdtable_get();
}
return fdt_fd_get(fdt, fd);
}
static void lwp_fd_release(int fdt_type, int fd)
{
struct dfs_fdtable *fdt;
if (fdt_type)
{
fdt = dfs_fdtable_get_global();
}
else
{
fdt = dfs_fdtable_get();
}
fdt_fd_release(fdt, fd);
}
static int _chfd_alloc(int fdt_type)
{
/* create a BSD socket */
int fd;
/* allocate a fd */
fd = lwp_fd_new(fdt_type);
if (fd < 0)
{
return -1;
}
return fd;
}
static void _chfd_free(int fd, int fdt_type)
{
struct dfs_file *d;
d = lwp_fd_get(fdt_type, fd);
if (d == RT_NULL)
{
return;
}
lwp_fd_release(fdt_type, fd);
}
/* for fops */
static int channel_fops_poll(struct dfs_file *file, struct rt_pollreq *req)
{
int mask = POLLOUT;
rt_channel_t ch;
ch = (rt_channel_t)file->vnode->data;
rt_poll_add(&(ch->reader_queue), req);
if (ch->stat != RT_IPC_STAT_IDLE)
{
return mask;
}
if (!rt_list_isempty(&ch->wait_msg))
{
mask |= POLLIN;
}
return mask;
}
static int channel_fops_close(struct dfs_file *file)
{
rt_channel_t ch;
rt_base_t level;
level = rt_hw_interrupt_disable();
ch = (rt_channel_t)file->vnode->data;
if (file->vnode->ref_count == 1)
{
ch->ref--;
if (ch->ref == 0)
{
/* wakeup all the suspended receivers and senders */
rt_channel_list_resume_all(&ch->parent.suspend_thread);
rt_channel_list_resume_all(&ch->wait_thread);
/* all ipc msg will lost */
rt_list_init(&ch->wait_msg);
rt_object_delete(&ch->parent.parent); /* release the IPC channel structure */
}
}
rt_hw_interrupt_enable(level);
return 0;
}
static const struct dfs_file_ops channel_fops =
{
NULL, /* open */
channel_fops_close,
NULL,
NULL,
NULL,
NULL,
NULL, /* lseek */
NULL, /* getdents */
channel_fops_poll,
};
int lwp_channel_open(int fdt_type, const char *name, int flags)
{
int fd;
rt_channel_t ch = RT_NULL;
struct dfs_file *d;
fd = _chfd_alloc(fdt_type); /* allocate an IPC channel descriptor */
if (fd == -1)
{
goto quit;
}
d = lwp_fd_get(fdt_type, fd);
d->vnode = (struct dfs_vnode *)rt_malloc(sizeof(struct dfs_vnode));
if (!d->vnode)
{
_chfd_free(fd, fdt_type);
fd = -1;
goto quit;
}
ch = rt_raw_channel_open(name, flags);
if (ch)
{
rt_memset(d->vnode, 0, sizeof(struct dfs_vnode));
rt_list_init(&d->vnode->list);
d->vnode->type = FT_USER;
d->vnode->path = NULL;
d->vnode->fullpath = NULL;
d->vnode->fops = &channel_fops;
d->flags = O_RDWR; /* set flags as read and write */
d->vnode->size = 0;
d->pos = 0;
d->vnode->ref_count = 1;
/* set socket to the data of dfs_file */
d->vnode->data = (void *)ch;
}
else
{
rt_free(d->vnode);
d->vnode = RT_NULL;
_chfd_free(fd, fdt_type);
fd = -1;
}
quit:
return fd;
}
static rt_channel_t fd_2_channel(int fdt_type, int fd)
{
struct dfs_file *d;
d = lwp_fd_get(fdt_type, fd);
if (d)
{
rt_channel_t ch;
ch = (rt_channel_t)d->vnode->data;
if (ch)
{
return ch;
}
}
return RT_NULL;
}
rt_err_t lwp_channel_close(int fdt_type, int fd)
{
rt_channel_t ch;
struct dfs_file *d;
struct dfs_vnode *vnode;
d = lwp_fd_get(fdt_type, fd);
if (!d)
{
return -RT_EIO;
}
vnode = d->vnode;
if (!vnode)
{
return -RT_EIO;
}
ch = fd_2_channel(fdt_type, fd);
if (!ch)
{
return -RT_EIO;
}
_chfd_free(fd, fdt_type);
if (vnode->ref_count == 1)
{
rt_free(vnode);
return rt_raw_channel_close(ch);
}
return 0;
}
rt_err_t lwp_channel_send(int fdt_type, int fd, rt_channel_msg_t data)
{
rt_channel_t ch;
ch = fd_2_channel(fdt_type, fd);
if (ch)
{
return rt_raw_channel_send(ch, data);
}
return -RT_EIO;
}
rt_err_t lwp_channel_send_recv_timeout(int fdt_type, int fd, rt_channel_msg_t data, rt_channel_msg_t data_ret, rt_int32_t time)
{
rt_channel_t ch;
ch = fd_2_channel(fdt_type, fd);
if (ch)
{
return rt_raw_channel_send_recv_timeout(ch, data, data_ret, time);
}
return -RT_EIO;
}
rt_err_t lwp_channel_reply(int fdt_type, int fd, rt_channel_msg_t data)
{
rt_channel_t ch;
ch = fd_2_channel(fdt_type, fd);
if (ch)
{
return rt_raw_channel_reply(ch, data);
}
return -RT_EIO;
}
rt_err_t lwp_channel_recv_timeout(int fdt_type, int fd, rt_channel_msg_t data, rt_int32_t time)
{
rt_channel_t ch;
ch = fd_2_channel(fdt_type, fd);
if (ch)
{
return rt_raw_channel_recv_timeout(ch, data, time);
}
return -RT_EIO;
}
int rt_channel_open(const char *name, int flags)
{
return lwp_channel_open(FDT_TYPE_KERNEL, name, flags);
}
rt_err_t rt_channel_close(int fd)
{
return lwp_channel_close(FDT_TYPE_KERNEL, fd);
}
rt_err_t rt_channel_send(int fd, rt_channel_msg_t data)
{
return lwp_channel_send(FDT_TYPE_KERNEL, fd, data);
}
rt_err_t rt_channel_send_recv_timeout(int fd, rt_channel_msg_t data, rt_channel_msg_t data_ret, rt_int32_t time)
{
return lwp_channel_send_recv_timeout(FDT_TYPE_KERNEL, fd, data, data_ret, time);
}
rt_err_t rt_channel_send_recv(int fd, rt_channel_msg_t data, rt_channel_msg_t data_ret)
{
return lwp_channel_send_recv_timeout(FDT_TYPE_KERNEL, fd, data, data_ret, RT_WAITING_FOREVER);
}
rt_err_t rt_channel_reply(int fd, rt_channel_msg_t data)
{
return lwp_channel_reply(FDT_TYPE_KERNEL, fd, data);
}
rt_err_t rt_channel_recv_timeout(int fd, rt_channel_msg_t data, rt_int32_t time)
{
return lwp_channel_recv_timeout(FDT_TYPE_KERNEL, fd, data, time);
}
rt_err_t rt_channel_recv(int fd, rt_channel_msg_t data)
{
return lwp_channel_recv_timeout(FDT_TYPE_KERNEL, fd, data, RT_WAITING_FOREVER);
}
rt_err_t rt_channel_peek(int fd, rt_channel_msg_t data)
{
return lwp_channel_recv_timeout(FDT_TYPE_KERNEL, fd, data, 0);
}
#ifdef RT_USING_FINSH
static int list_channel(void)
{
rt_base_t level;
rt_channel_t *channels;
rt_ubase_t index, count;
struct rt_object *object;
struct rt_list_node *node;
struct rt_object_information *information;
const char* stat_strs[] = {"idle", "wait", "active"};
information = rt_object_get_information(RT_Object_Class_Channel);
RT_ASSERT(information != RT_NULL);
count = 0;
level = rt_hw_interrupt_disable();
/* get the count of IPC channels */
for (node = information->object_list.next;
node != &(information->object_list);
node = node->next)
{
count ++;
}
rt_hw_interrupt_enable(level);
if (count == 0) return 0;
channels = (rt_channel_t *) rt_calloc(count, sizeof(rt_channel_t));
if (channels == RT_NULL) return 0; /* out of memory */
index = 0;
level = rt_hw_interrupt_disable();
/* retrieve pointer of IPC channels */
for (node = information->object_list.next;
node != &(information->object_list);
node = node->next)
{
object = rt_list_entry(node, struct rt_object, list);
channels[index] = (rt_channel_t)object;
index ++;
}
rt_hw_interrupt_enable(level);
rt_kprintf(" channel state\n");
rt_kprintf("-------- -------\n");
for (index = 0; index < count; index ++)
{
if (channels[index] != RT_NULL)
{
rt_kprintf("%-*.s", RT_NAME_MAX, channels[index]->parent.parent.name);
if (channels[index]->stat < 3)
rt_kprintf(" %s\n", stat_strs[channels[index]->stat]);
}
}
rt_free(channels);
return 0;
}
MSH_CMD_EXPORT(list_channel, list IPC channel information);
#endif
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