diff options
Diffstat (limited to 'nuttx/sched/task/task_restart.c')
| -rw-r--r-- | nuttx/sched/task/task_restart.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/nuttx/sched/task/task_restart.c b/nuttx/sched/task/task_restart.c new file mode 100644 index 000000000..dd3a78547 --- /dev/null +++ b/nuttx/sched/task/task_restart.c @@ -0,0 +1,209 @@ +/**************************************************************************** + * sched/task/task_restart.c + * + * Copyright (C) 2007, 2009, 2012-2013 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 <sched.h> +#include <errno.h> + +#include <nuttx/arch.h> + +#include "os_internal.h" +#include "group/group.h" +#include "signal/signal.h" +#include "task/task.h" + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Type Declarations + ****************************************************************************/ + +/**************************************************************************** + * Global Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: task_restart + * + * Description: + * This function "restarts" a task. The task is first terminated and then + * reinitialized with same ID, priority, original entry point, stack size, + * and parameters it had when it was first started. + * + * Inputs: + * pid - The task ID of the task to delete. An ID of zero signifies the + * calling task. + * + * Return Value: + * OK on sucess; ERROR on failure. + * + * This function can fail if: + * (1) A pid of zero or the pid of the calling task is provided + * (functionality not implemented) + * (2) The pid is not associated with any task known to the system. + * + ****************************************************************************/ + +int task_restart(pid_t pid) +{ + FAR struct tcb_s *rtcb; + FAR struct task_tcb_s *tcb; + irqstate_t state; + int status; + + /* Make sure this task does not become ready-to-run while + * we are futzing with its TCB + */ + + sched_lock(); + + /* Check if the task to restart is the calling task */ + + rtcb = (FAR struct tcb_s *)g_readytorun.head; + if ((pid == 0) || (pid == rtcb->pid)) + { + /* Not implemented */ + + set_errno(ENOSYS); + return ERROR; + } + + /* We are restarting some other task than ourselves */ + + else + { + /* Find for the TCB associated with matching pid */ + + tcb = (FAR struct task_tcb_s *)sched_gettcb(pid); +#ifndef CONFIG_DISABLE_PTHREAD + if (!tcb || (tcb->cmn.flags & TCB_FLAG_TTYPE_MASK) == TCB_FLAG_TTYPE_PTHREAD) +#else + if (!tcb) +#endif + { + /* There is no TCB with this pid or, if there is, it is not a + * task. + */ + + set_errno(ESRCH); + return ERROR; + } + + /* Try to recover from any bad states */ + + task_recover((FAR struct tcb_s *)tcb); + + /* Kill any children of this thread */ + +#if HAVE_GROUP_MEMBERS + (void)group_killchildren(tcb); +#endif + + /* Remove the TCB from whatever list it is in. At this point, the + * TCB should no longer be accessible to the system + */ + + state = irqsave(); + dq_rem((FAR dq_entry_t*)tcb, + (dq_queue_t*)g_tasklisttable[tcb->cmn.task_state].list); + tcb->cmn.task_state = TSTATE_TASK_INVALID; + irqrestore(state); + + /* Deallocate anything left in the TCB's queues */ + + sig_cleanup((FAR struct tcb_s *)tcb); /* Deallocate Signal lists */ + + /* Reset the current task priority */ + + tcb->cmn.sched_priority = tcb->init_priority; + + /* Reset the base task priority and the number of pending reprioritizations */ + +#ifdef CONFIG_PRIORITY_INHERITANCE + tcb->cmn.base_priority = tcb->init_priority; +# if CONFIG_SEM_NNESTPRIO > 0 + tcb->cmn.npend_reprio = 0; +# endif +#endif + + /* Re-initialize the processor-specific portion of the TCB + * This will reset the entry point and the start-up parameters + */ + + up_initial_state((FAR struct tcb_s *)tcb); + + /* Add the task to the inactive task list */ + + dq_addfirst((FAR dq_entry_t*)tcb, (dq_queue_t*)&g_inactivetasks); + tcb->cmn.task_state = TSTATE_TASK_INACTIVE; + + /* Activate the task */ + + status = task_activate((FAR struct tcb_s *)tcb); + if (status != OK) + { + (void)task_delete(pid); + set_errno(-status); + return ERROR; + } + } + + sched_unlock(); + return OK; +} |