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125 lines
4.6 KiB
125 lines
4.6 KiB
/***************************************************************************** |
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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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