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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2013-01-25 17:23:38 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2013-01-25 17:23:38 +0000 |
commit | f2933cc4b65836a712f1ab996512999959a8c48a (patch) | |
tree | dd7f8afd13defdb90a4a8ffaba352f90efc3ec3a /nuttx/sched/group_leave.c | |
parent | 1520663dd52c25496f285eb2e08077318c600759 (diff) | |
download | px4-nuttx-f2933cc4b65836a712f1ab996512999959a8c48a.tar.gz px4-nuttx-f2933cc4b65836a712f1ab996512999959a8c48a.tar.bz2 px4-nuttx-f2933cc4b65836a712f1ab996512999959a8c48a.zip |
Add framework to support task groups
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5562 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/sched/group_leave.c')
-rw-r--r-- | nuttx/sched/group_leave.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/nuttx/sched/group_leave.c b/nuttx/sched/group_leave.c new file mode 100644 index 000000000..69a6ea8b2 --- /dev/null +++ b/nuttx/sched/group_leave.c @@ -0,0 +1,127 @@ +/***************************************************************************** + * sched/group_leave.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 <assert.h> +#include <errno.h> +#include <debug.h> + +#include "os_internal.h" + +#ifdef HAVE_TASK_GROUP + +/***************************************************************************** + * Pre-processor Definitions + *****************************************************************************/ + +/***************************************************************************** + * Private Types + *****************************************************************************/ + +/***************************************************************************** + * Private Data + *****************************************************************************/ + +/***************************************************************************** + * Private Functions + *****************************************************************************/ + +/***************************************************************************** + * Public Functions + *****************************************************************************/ + +/***************************************************************************** + * Name: group_leave + * + * Description: + * Release a reference on a group. This function is called when a task or + * thread exits. It decrements the reference count on the group. If the + * reference count decrements to zero, then it frees the group and all of + * resources contained in the group. + * + * Parameters: + * tcb - The TCB of the task that is exiting. + * + * Return Value: + * None. + * + * Assumptions: + * Called during task deletion in a safe context. No special precautions + * are required here. + * + *****************************************************************************/ + +void group_leave(FAR _TCB *tcb) +{ + FAR struct task_group_s *group; + + DEBUGASSERT(tcb); + + /* Make sure that we have a group */ + + group = tcb->group; + if (group) + { + /* Would the reference count decrement to zero? */ + + if (group->tg_crefs > 1) + { + /* No.. just decrement the reference count and return */ + + group->tg_crefs--; + } + else + { + /* Yes.. Release all of the resource contained within the group */ + /* Free all un-reaped child exit status */ + + task_removechildren(tcb); + + /* Release the group container itself */ + + sched_free(group); + } + + tcb->group = NULL; + } +} + +#endif /* HAVE_TASK_GROUP */ |