157 lines
4.3 KiB
C
157 lines
4.3 KiB
C
/* microkernel/pipe.h */
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/*
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* Copyright (c) 1997-2014 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef PIPE_H
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#define PIPE_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Microkernel Pipes
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* @defgroup microkernel_pipe Microkernel Pipes
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* @ingroup microkernel_services
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* @{
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*/
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#include <sections.h>
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/**
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* @cond internal
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*/
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/**
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* @internal
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* @brief Initialize a pipe struct.
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*
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* @param size Size of pipe buffer.
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* @param buffer Pointer to the buffer.
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* @endinternal
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*/
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#define __K_PIPE_INITIALIZER(size, buffer) \
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{ \
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.buffer_size = size, \
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.Buffer = buffer, \
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}
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/**
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* @endcond
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*/
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/**
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* @brief Pipe write request
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*
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* Attempt to write data from a memory buffer area to the
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* specified pipe with a timeout option.
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*
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* @param id Pipe ID
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* @param buffer Buffer
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* @param bytes_to_write Number of bytes to write
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* @param bytes_written Pointer to number of bytes written
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* @param options Pipe options
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* @param timeout Affects the action taken should the pipe be full. If
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* TICKS_NONE, then return immediately. If TICKS_UNLIMITED, then wait as long
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* as necessary. Otherwise wait up to the specified number of ticks before
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* timing out.
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*
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* @retval RC_OK Successfully wrote data to pipe
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* @retval RC_ALIGNMENT Data is improperly aligned
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* @retval RC_INCOMPLETE Only some of the data was written to the pipe when
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* @a options = _ALL_N
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* @retval RC_TIME Timed out waiting to write to pipe
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* @retval RC_FAIL Failed to immediately write to pipe when
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* @a timeout = TICKS_NONE
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*/
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extern int task_pipe_put(kpipe_t id, void *buffer, int bytes_to_write,
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int *bytes_written, K_PIPE_OPTION options, int32_t timeout);
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/**
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* @brief Pipe read request
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*
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* Attempt to read data into a memory buffer area from the
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* specified pipe with a timeout option.
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*
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* @param id Pipe ID
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* @param buffer Buffer
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* @param bytes_to_read Number of bytes to read
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* @param bytes_read Pointer to number of bytes read
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* @param options Pipe options
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* @param timeout Affects the action taken should the pipe be empty. If
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* TICKS_NONE, then return immediately. If TICKS_UNLIMITED, then wait as long
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* as necessary. Otherwise wait up to the specified number of ticks before
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* timing out.
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*
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* @retval RC_OK Successfully read data from pipe
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* @retval RC_ALIGNMENT Data is improperly aligned
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* @retval RC_INCOMPLETE Only some of the data was read from the pipe when
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* @a options = _ALL_N
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* @retval RC_TIME Timed out waiting to read from pipe
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* @retval RC_FAIL Failed to immediately read from pipe when
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* @a timeout = TICKS_NONE
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*/
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extern int task_pipe_get(kpipe_t id, void *buffer, int bytes_to_read,
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int *bytes_read, K_PIPE_OPTION options, int32_t timeout);
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extern int _task_pipe_block_put(kpipe_t id,
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struct k_block block,
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int size,
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ksem_t sema);
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/**
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* @brief Asynchronous pipe write request
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*
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* This routine attempts to write data from a memory pool block to the
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* specified pipe. (Note that partial transfers and timeouts are not
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* supported, unlike the case for synchronous write requests.)
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*
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* @param id pipe ID
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* @param block Block
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* @param size Size of data to be transferred
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* @param sema Semphore ID
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*
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* @return RC_OK, RC_FAIL, or RC_ALIGNMENT
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*/
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#define task_pipe_block_put(id, block, size, sema) \
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_task_pipe_block_put(id, block, size, sema)
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/**
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* @brief Define a private microkernel pipe.
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*
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* @param name Name of the pipe.
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* @param size Size of the pipe buffer, in bytes.
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*/
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#define DEFINE_PIPE(name, size) \
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char __noinit __pipe_buffer_##name[size]; \
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struct _k_pipe_struct _k_pipe_obj_##name = \
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__K_PIPE_INITIALIZER(size, __pipe_buffer_##name); \
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const kpipe_t name \
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__in_section(_k_pipe_ptr, private, pipe) = \
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(kpipe_t)&_k_pipe_obj_##name;
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/**
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* @}
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* PIPE_H */
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