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Diffstat (limited to 'nuttx/sched/task/task_init.c')
| -rw-r--r-- | nuttx/sched/task/task_init.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/nuttx/sched/task/task_init.c b/nuttx/sched/task/task_init.c new file mode 100644 index 000000000..a0ff9e750 --- /dev/null +++ b/nuttx/sched/task/task_init.c @@ -0,0 +1,198 @@ +/**************************************************************************** + * sched/task/task_init.c + * + * Copyright (C) 2007, 2009, 2013 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 "os_internal.h" +#include "group/group.h" +#include "task/task.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 with errno set appropriately. (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 struct tcb_s *tcb, const char *name, int priority, + FAR uint32_t *stack, uint32_t stack_size, + main_t entry, FAR char * const argv[]) +#else +int task_init(FAR struct tcb_s *tcb, const char *name, int priority, + main_t entry, FAR char * const argv[]) +#endif +{ + 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 */ + +#ifdef HAVE_TASK_GROUP + ret = group_allocate(ttcb); + if (ret < 0) + { + errcode = -ret; + goto errout; + } +#endif + + /* Associate file descriptors with the new task */ + +#if CONFIG_NFILE_DESCRIPTORS > 0 || CONFIG_NSOCKET_DESCRIPTORS > 0 + ret = group_setuptaskfiles(ttcb); + if (ret < 0) + { + errcode = -ret; + goto errout_with_group; + } +#endif + + /* 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(ttcb, priority, task_start, entry, + TCB_FLAG_TTYPE_TASK); + if (ret < OK) + { + errcode = -ret; + goto errout_with_group; + } + + /* Setup to pass parameters to the new task */ + + (void)task_argsetup(ttcb, name, argv); + + /* Now we have enough in place that we can join the group */ + +#ifdef HAVE_TASK_GROUP + ret = group_initialize(ttcb); + if (ret < 0) + { + errcode = -ret; + goto errout_with_group; + } +#endif + return OK; + +errout_with_group: +#ifdef HAVE_TASK_GROUP + group_leave(tcb); + +errout: +#endif + set_errno(errcode); + return ERROR; +} + |