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Diffstat (limited to 'nuttx/sched/group_childstatus.c')
| -rw-r--r-- | nuttx/sched/group_childstatus.c | 441 |
1 files changed, 0 insertions, 441 deletions
diff --git a/nuttx/sched/group_childstatus.c b/nuttx/sched/group_childstatus.c deleted file mode 100644 index ef42b6c34..000000000 --- a/nuttx/sched/group_childstatus.c +++ /dev/null @@ -1,441 +0,0 @@ -/***************************************************************************** - * sched/group_childstatus.c - * - * Copyright (C) 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 <sched.h> -#include <errno.h> -#include <debug.h> - -#include "os_internal.h" -#include "group_internal.h" - -#if defined(CONFIG_SCHED_HAVE_PARENT) && defined(CONFIG_SCHED_CHILD_STATUS) - -/***************************************************************************** - * Pre-processor Definitions - *****************************************************************************/ -/* Note that there cannot be more that CONFIG_MAX_TASKS tasks in total. - * However, the number of child status structures may need to be significantly - * larger because this number includes the maximum number of tasks that are - * running PLUS the number of tasks that have exit'ed without having their - * exit status reaped (via wait(), waitid(), or waitpid()). - * - * Obviously, if tasks spawn children indefinitely and never have the exit - * status reaped, then you have a memory leak! - */ - -#if !defined(CONFIG_PREALLOC_CHILDSTATUS) || CONFIG_PREALLOC_CHILDSTATUS == 0 -# undef CONFIG_PREALLOC_CHILDSTATUS -# define CONFIG_PREALLOC_CHILDSTATUS (2*CONFIG_MAX_TASKS) -#endif - -#ifndef CONFIG_DEBUG -# undef CONFIG_DEBUG_CHILDSTATUS -#endif - -/***************************************************************************** - * Private Types - *****************************************************************************/ -/* Globals are maintained in a structure to minimize name collisions. */ - -struct child_pool_s -{ - struct child_status_s alloc[CONFIG_PREALLOC_CHILDSTATUS]; - FAR struct child_status_s *freelist; -}; - -/***************************************************************************** - * Private Data - *****************************************************************************/ - -static struct child_pool_s g_child_pool; - -/***************************************************************************** - * Private Functions - *****************************************************************************/ - -/***************************************************************************** - * Name: group_dumpchildren - * - * Description: - * Dump all of the children when the part TCB list is modified. - * - * Parameters: - * group - The task group containing the child status. - * - * Return Value: - * None. - * - * Assumptions: - * Called early in initialization. No special precautions are required. - * - *****************************************************************************/ - -#ifdef CONFIG_DEBUG_CHILDSTATUS -static void group_dumpchildren(FAR struct task_group_s *group, - FAR const char *msg) -{ - FAR struct child_status_s *child; - int i; - - dbg("Task group=%p: %s\n", group, msg); - for (i = 0, child = group->tg_children; child; i++, child = child->flink) - { - dbg(" %d. ch_flags=%02x ch_pid=%d ch_status=%d\n", - i, child->ch_flags, child->ch_pid, child->ch_status); - } -} -#else -# define group_dumpchildren(t,m) -#endif - -/***************************************************************************** - * Public Functions - *****************************************************************************/ - -/***************************************************************************** - * Name: task_initialize - * - * Description: - * Initialize task related status. At present, this includes only the - * initialize of the child status pool. - * - * Parameters: - * None. - * - * Return Value: - * None. - * - * Assumptions: - * Called early in initialization. No special precautions are required. - * - *****************************************************************************/ - -void task_initialize(void) -{ - FAR struct child_status_s *curr; - FAR struct child_status_s *prev; - int i; - - /* Save all of the child status structures in a free list */ - - prev = &g_child_pool.alloc[0]; - g_child_pool.freelist = prev; - for (i = 0; i < CONFIG_PREALLOC_CHILDSTATUS; i++) - { - curr = &g_child_pool.alloc[i]; - prev->flink = curr; - prev = curr; - } -} - -/***************************************************************************** - * Name: group_allocchild - * - * Description: - * Allocate a child status structure by removing the next entry from a - * free list. - * - * Parameters: - * None. - * - * Return Value: - * On success, a non-NULL pointer to a child status structure. NULL is - * returned if there are no remaining, pre-allocated child status structures. - * - * Assumptions: - * Called during task creation in a safe context. No special precautions - * are required here. - * - *****************************************************************************/ - -FAR struct child_status_s *group_allocchild(void) -{ - FAR struct child_status_s *ret; - - /* Return the status block at the head of the free list */ - - ret = g_child_pool.freelist; - if (ret) - { - g_child_pool.freelist = ret->flink; - ret->flink = NULL; - } - - return ret; -} - -/***************************************************************************** - * Name: group_freechild - * - * Description: - * Release a child status structure by returning it to a free list. - * - * Parameters: - * status - The child status structure to be freed. - * - * Return Value: - * None. - * - * Assumptions: - * Called during task creation in a safe context. No special precautions - * are required here. - * - *****************************************************************************/ - -void group_freechild(FAR struct child_status_s *child) -{ - /* Return the child status structure to the free list */ - - if (child) - { - child->flink = g_child_pool.freelist; - g_child_pool.freelist = child; - } -} - -/***************************************************************************** - * Name: group_addchild - * - * Description: - * Add a child status structure in the given TCB. - * - * Parameters: - * group - The task group for the child status. - * child - The structure to be added - * - * Return Value: - * N - * - * Assumptions: - * Called during task creation processing in a safe context. No special - * precautions are required here. - * - *****************************************************************************/ - -void group_addchild(FAR struct task_group_s *group, - FAR struct child_status_s *child) -{ - /* Add the entry into the TCB list of children */ - - child->flink = group->tg_children; - group->tg_children = child; - - group_dumpchildren(group, "group_addchild"); -} - -/***************************************************************************** - * Name: group_findchild - * - * Description: - * Find a child status structure in the given task group. A reference to - * the child structure is returned, but the child remains the the group's - * list of children. - * - * Parameters: - * group - The ID of the parent task group to containing the child status. - * pid - The ID of the child to find. - * - * Return Value: - * On success, a non-NULL pointer to a child status structure. NULL is - * returned if there is child status structure for that pid in the TCB. - * - * Assumptions: - * Called during SIGCHLD processing in a safe context. No special precautions - * are required here. - * - *****************************************************************************/ - -FAR struct child_status_s *group_findchild(FAR struct task_group_s *group, - pid_t pid) -{ - FAR struct child_status_s *child; - - DEBUGASSERT(group); - - /* Find the status structure with the matching PID */ - - for (child = group->tg_children; child; child = child->flink) - { - if (child->ch_pid == pid) - { - return child; - } - } - - return NULL; -} - -/***************************************************************************** - * Name: group_exitchild - * - * Description: - * Search for any child that has exitted. - * - * Parameters: - * tcb - The TCB of the parent task to containing the child status. - * - * Return Value: - * On success, a non-NULL pointer to a child status structure for the - * exited child. NULL is returned if not child has exited. - * - * Assumptions: - * Called during SIGCHLD processing in a safe context. No special precautions - * are required here. - * - *****************************************************************************/ - -FAR struct child_status_s *group_exitchild(FAR struct task_group_s *group) -{ - FAR struct child_status_s *child; - - /* Find the status structure of any child task that has exitted. */ - - for (child = group->tg_children; child; child = child->flink) - { - if ((child->ch_flags & CHILD_FLAG_EXITED) != 0) - { - return child; - } - } - - return NULL; -} - -/***************************************************************************** - * Name: group_removechild - * - * Description: - * Remove one child structure from a task group. The child is removed, but - * is not yet freed. group_freechild must be called in order to free the - * child status structure. - * - * Parameters: - * group - The task group containing the child status. - * pid - The ID of the child to find. - * - * Return Value: - * On success, a non-NULL pointer to a child status structure. NULL is - * returned if there is child status structure for that pid in the TCB. - * - * Assumptions: - * Called during SIGCHLD processing in a safe context. No special precautions - * are required here. - * - *****************************************************************************/ - -FAR struct child_status_s *group_removechild(FAR struct task_group_s *group, - pid_t pid) -{ - FAR struct child_status_s *curr; - FAR struct child_status_s *prev; - - DEBUGASSERT(group); - - /* Find the status structure with the matching PID */ - - for (prev = NULL, curr = group->tg_children; - curr; - prev = curr, curr = curr->flink) - { - if (curr->ch_pid == pid) - { - break; - } - } - - /* Did we find it? If so, remove it from the group. */ - - if (curr) - { - /* Do we remove it from mid-list? Or from the head of the list? */ - - if (prev) - { - prev->flink = curr->flink; - } - else - { - group->tg_children = curr->flink; - } - - curr->flink = NULL; - group_dumpchildren(group, "group_removechild"); - } - - return curr; -} - -/***************************************************************************** - * Name: group_removechildren - * - * Description: - * Remove and free all child structure from the task group. - * - * Parameters: - * group - The task group containing the child status. - * - * Return Value: - * None. - * - * Assumptions: - * Called during task exit processing in a safe context. No special - * precautions are required here. - * - *****************************************************************************/ - -void group_removechildren(FAR struct task_group_s *group) -{ - FAR struct child_status_s *curr; - FAR struct child_status_s *next; - - /* Remove all child structures for the TCB and return them to the freelist */ - - for (curr = group->tg_children; curr; curr = next) - { - next = curr->flink; - group_freechild(curr); - } - - group->tg_children = NULL; - group_dumpchildren(group, "group_removechildren"); -} - -#endif /* CONFIG_SCHED_HAVE_PARENT && CONFIG_SCHED_CHILD_STATUS */ |