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git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3
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patacongo
2012-09-17 18:18:44 +00:00
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nuttx/sched/task_init.c
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/****************************************************************************
* sched/task_init.c
*
* Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <sched.h>
#include <nuttx/arch.h>
#include "os_internal.h"
#include "env_internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Type Declarations
****************************************************************************/
/****************************************************************************
* Global Variables
****************************************************************************/
/****************************************************************************
* Private Variables
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: task_init
*
* Description:
* This function initializes a Task Control Block (TCB) in preparation for
* starting a new thread. It performs a subset of the functionality of
* task_create()
*
* Unlike task_create():
* 1. Allocate the TCB. The pre-allocated TCB is passed in the arguments.
* 2. Allocate the stack. The pre-allocated stack is passed in the arguments.
* 3. Activate the task. This must be done by calling task_activate().
*
* Input Parameters:
* tcb - Address of the new task's TCB
* name - Name of the new task (not used)
* priority - Priority of the new task
* stack - Start of the pre-allocated stack
* stack_size - Size (in bytes) of the stack allocated
* entry - Application start point of the new task
* arg - A pointer to an array of input parameters. Up to
* CONFIG_MAX_TASK_ARG parameters may be provided. If fewer
* than CONFIG_MAX_TASK_ARG parameters are passed, the list
* should be terminated with a NULL argv[] value. If no
* parameters are required, argv may be NULL.
*
* Return Value:
* OK on success; ERROR on failure. (See task_schedsetup() for possible
* failure conditions). On failure, the caller is responsible for freeing
* the stack memory and for calling sched_releasetcb() to free the TCB
* (which could be in most any state).
*
****************************************************************************/
#ifndef CONFIG_CUSTOM_STACK
int task_init(FAR _TCB *tcb, const char *name, int priority,
FAR uint32_t *stack, uint32_t stack_size,
main_t entry, const char *argv[])
#else
int task_init(FAR _TCB *tcb, const char *name, int priority,
main_t entry, const char *argv[])
#endif
{
int ret;
/* Associate file descriptors with the new task */
#if CONFIG_NFILE_DESCRIPTORS > 0 || CONFIG_NSOCKET_DESCRIPTORS > 0
if (sched_setuptaskfiles(tcb) != OK)
{
return ERROR;
}
#endif
/* Clone the parent's task environment */
(void)env_dup(tcb);
/* Configure the user provided stack region */
#ifndef CONFIG_CUSTOM_STACK
up_use_stack(tcb, stack, stack_size);
#endif
/* Initialize the task control block */
ret = task_schedsetup(tcb, priority, task_start, entry);
if (ret == OK)
{
/* Setup to pass parameters to the new task */
(void)task_argsetup(tcb, name, argv);
}
return ret;
}