126 lines
4.6 KiB
C
126 lines
4.6 KiB
C
/*****************************************************************************
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* sched/group_find.c
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*****************************************************************************/
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/*****************************************************************************
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* Included Files
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*****************************************************************************/
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#include <nuttx/config.h>
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#include <sched.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include "group_internal.h"
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#include "env_internal.h"
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#ifdef HAVE_TASK_GROUP
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/*****************************************************************************
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* Pre-processor Definitions
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*****************************************************************************/
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/*****************************************************************************
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* Private Types
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*****************************************************************************/
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/*****************************************************************************
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* Private Data
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*****************************************************************************/
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/*****************************************************************************
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* Public Data
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*****************************************************************************/
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/*****************************************************************************
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* Private Functions
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*****************************************************************************/
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/*****************************************************************************
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* Public Functions
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*****************************************************************************/
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/*****************************************************************************
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* Name: group_find
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*
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* Description:
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* Given a group ID, find the group task structure with that ID. IDs are
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* used instead of pointers to group structures. This is done because a
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* group can disappear at any time leaving a stale pointer; an ID is cleaner
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* because if the group disappears, this function will fail gracefully.
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*
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* Parameters:
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* gid - The group ID to find.
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*
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* Return Value:
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* On success, a pointer to the group task structure is returned. This
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* function can fail only if there is no group that corresponds to the
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* groupd ID.
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*
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* Assumptions:
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* Called during when signally tasks in a safe context. No special
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* precautions should be required here. However, extra care is taken when
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* accessing the global g_grouphead list.
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*
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*****************************************************************************/
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#ifdef HAVE_GROUP_MEMBERS
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FAR struct task_group_s *group_find(gid_t gid)
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{
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FAR struct task_group_s *group;
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irqstate_t flags;
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/* Find the status structure with the matching PID */
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flags = irqsave();
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for (group = g_grouphead; group; group = group->flink)
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{
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if (group->tg_gid == gid)
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{
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irqrestore(flags);
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return group;
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}
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}
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irqrestore(flags);
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return NULL;
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}
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#endif
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#endif /* HAVE_TASK_GROUP */
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