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- /****************************************************************************
- * sched/task/task_init.c
- *
- * Copyright (C) 2007, 2009, 2013-2014 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 <errno.h>
- #include <nuttx/arch.h>
- #include "sched/sched.h"
- #include "group/group.h"
- #include "task/task.h"
- /****************************************************************************
- * 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. The array
- * should be terminated with a NULL argv[] value. If no
- * parameters are required, argv may be NULL.
- *
- * Returned Value:
- * OK on success; ERROR on failure with errno set appropriately. (See
- * nxtask_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).
- *
- ****************************************************************************/
- int task_init(FAR struct tcb_s *tcb, const char *name, int priority,
- FAR uint32_t *stack, uint32_t stack_size,
- main_t entry, FAR char * const argv[])
- {
- FAR struct task_tcb_s *ttcb = (FAR struct task_tcb_s *)tcb;
- int errcode;
- int ret;
- /* Only tasks and kernel threads can be initialized in this way */
- #ifndef CONFIG_DISABLE_PTHREAD
- DEBUGASSERT(tcb &&
- (tcb->flags & TCB_FLAG_TTYPE_MASK) != TCB_FLAG_TTYPE_PTHREAD);
- #endif
- /* Create a new task group */
- ret = group_allocate(ttcb, tcb->flags);
- if (ret < 0)
- {
- errcode = -ret;
- goto errout;
- }
- /* Associate file descriptors with the new task */
- ret = group_setuptaskfiles(ttcb);
- if (ret < 0)
- {
- errcode = -ret;
- goto errout_with_group;
- }
- /* Configure the user provided stack region */
- up_use_stack(tcb, stack, stack_size);
- /* Initialize the task control block */
- ret = nxtask_schedsetup(ttcb, priority, nxtask_start, entry,
- TCB_FLAG_TTYPE_TASK);
- if (ret < OK)
- {
- errcode = -ret;
- goto errout_with_group;
- }
- /* Setup to pass parameters to the new task */
- (void)nxtask_argsetup(ttcb, name, argv);
- /* Now we have enough in place that we can join the group */
- ret = group_initialize(ttcb);
- if (ret < 0)
- {
- errcode = -ret;
- goto errout_with_group;
- }
- return OK;
- errout_with_group:
- group_leave(tcb);
- errout:
- set_errno(errcode);
- return ERROR;
- }
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