aboutsummaryrefslogtreecommitdiff
path: root/nuttx/sched/task_reparent.c
diff options
context:
space:
mode:
Diffstat (limited to 'nuttx/sched/task_reparent.c')
-rw-r--r--nuttx/sched/task_reparent.c320
1 files changed, 0 insertions, 320 deletions
diff --git a/nuttx/sched/task_reparent.c b/nuttx/sched/task_reparent.c
deleted file mode 100644
index 5bb62893f..000000000
--- a/nuttx/sched/task_reparent.c
+++ /dev/null
@@ -1,320 +0,0 @@
-/*****************************************************************************
- * sched/task_reparent.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 <errno.h>
-
-#include "os_internal.h"
-#include "group_internal.h"
-
-#ifdef CONFIG_SCHED_HAVE_PARENT
-
-/*****************************************************************************
- * Private Functions
- *****************************************************************************/
-
-/*****************************************************************************
- * Public Functions
- *****************************************************************************/
-
-/*****************************************************************************
- * Name: task_reparent
- *
- * Description:
- * Change the parent of a task.
- *
- * Parameters:
- * ppid - PID of the new parent task (0 for grandparent, i.e. the parent
- * of the current parent task)
- * chpid - PID of the child to be reparented.
- *
- * Return Value:
- * 0 (OK) on success; A negated errno value on failure.
- *
- *****************************************************************************/
-
-#ifdef HAVE_GROUP_MEMBERS
-int task_reparent(pid_t ppid, pid_t chpid)
-{
-#ifdef CONFIG_SCHED_CHILD_STATUS
- FAR struct child_status_s *child;
-#endif
- FAR struct task_group_s *chgrp;
- FAR struct task_group_s *ogrp;
- FAR struct task_group_s *pgrp;
- _TCB *tcb;
- gid_t ogid;
- gid_t pgid;
- irqstate_t flags;
- int ret;
-
- /* Disable interrupts so that nothing can change in the relatinoship of
- * the three task: Child, current parent, and new parent.
- */
-
- flags = irqsave();
-
- /* Get the child tasks task group */
-
- tcb = sched_gettcb(chpid);
- if (!tcb)
- {
- ret = -ECHILD;
- goto errout_with_ints;
- }
-
- DEBUGASSERT(tcb->group);
- chgrp = tcb->group;
-
- /* Get the GID of the old parent task's task group (ogid) */
-
- ogid = chgrp->tg_pgid;
-
- /* Get the old parent task's task group (ogrp) */
-
- ogrp = group_find(ogid);
- if (!ogrp)
- {
- ret = -ESRCH;
- goto errout_with_ints;
- }
-
- /* If new parent task's PID (ppid) is zero, then new parent is the
- * grandparent will be the new parent, i.e., the parent of the current
- * parent task.
- */
-
- if (ppid == 0)
- {
- /* Get the grandparent task's task group (pgrp) */
-
- pgid = ogrp->tg_pgid;
- pgrp = group_find(pgid);
- }
- else
- {
- /* Get the new parent task's task group (pgrp) */
-
- tcb = sched_gettcb(ppid);
- if (!tcb)
- {
- ret = -ESRCH;
- goto errout_with_ints;
- }
-
- pgrp = tcb->group;
- pgid = pgrp->tg_gid;
- }
-
- if (!pgrp)
- {
- ret = -ESRCH;
- goto errout_with_ints;
- }
-
- /* Then reparent the child. Notice that we don't actually change the
- * parent of the task. Rather, we change the parent task group for
- * all members of the child's task group.
- */
-
- chgrp->tg_pgid = pgid;
-
-#ifdef CONFIG_SCHED_CHILD_STATUS
- /* Remove the child status entry from old parent task group */
-
- child = group_removechild(ogrp, chpid);
- if (child)
- {
- /* Has the new parent's task group supressed child exit status? */
-
- if ((pgrp->tg_flags && GROUP_FLAG_NOCLDWAIT) == 0)
- {
- /* No.. Add the child status entry to the new parent's task group */
-
- group_addchild(pgrp, child);
- }
- else
- {
- /* Yes.. Discard the child status entry */
-
- group_freechild(child);
- }
-
- /* Either case is a success */
-
- ret = OK;
- }
- else
- {
- /* This would not be an error if the original parent's task group has
- * suppressed child exit status.
- */
-
- ret = ((ogrp->tg_flags && GROUP_FLAG_NOCLDWAIT) == 0) ? -ENOENT : OK;
- }
-
-#else /* CONFIG_SCHED_CHILD_STATUS */
-
- DEBUGASSERT(otcb->nchildren > 0);
-
- otcb->nchildren--; /* The orignal parent now has one few children */
- ptcb->nchildren++; /* The new parent has one additional child */
- ret = OK;
-
-#endif /* CONFIG_SCHED_CHILD_STATUS */
-
-errout_with_ints:
- irqrestore(flags);
- return ret;
-}
-#else
-int task_reparent(pid_t ppid, pid_t chpid)
-{
-#ifdef CONFIG_SCHED_CHILD_STATUS
- FAR struct child_status_s *child;
-#endif
- _TCB *ptcb;
- _TCB *chtcb;
- _TCB *otcb;
- pid_t opid;
- irqstate_t flags;
- int ret;
-
- /* Disable interrupts so that nothing can change in the relatinoship of
- * the three task: Child, current parent, and new parent.
- */
-
- flags = irqsave();
-
- /* Get the child tasks TCB (chtcb) */
-
- chtcb = sched_gettcb(chpid);
- if (!chtcb)
- {
- ret = -ECHILD;
- goto errout_with_ints;
- }
-
- /* Get the PID of the child task's parent (opid) */
-
- opid = chtcb->ppid;
-
- /* Get the TCB of the child task's parent (otcb) */
-
- otcb = sched_gettcb(opid);
- if (!otcb)
- {
- ret = -ESRCH;
- goto errout_with_ints;
- }
-
- /* If new parent task's PID (ppid) is zero, then new parent is the
- * grandparent will be the new parent, i.e., the parent of the current
- * parent task.
- */
-
- if (ppid == 0)
- {
- ppid = otcb->ppid;
- }
-
- /* Get the new parent task's TCB (ptcb) */
-
- ptcb = sched_gettcb(ppid);
- if (!ptcb)
- {
- ret = -ESRCH;
- goto errout_with_ints;
- }
-
- /* Then reparent the child */
-
- chtcb->ppid = ppid; /* The task specified by ppid is the new parent */
-
-#ifdef CONFIG_SCHED_CHILD_STATUS
- /* Remove the child status entry from old parent TCB */
-
- child = group_removechild(otcb->group, chpid);
- if (child)
- {
- /* Has the new parent's task group supressed child exit status? */
-
- if ((ptcb->group->tg_flags && GROUP_FLAG_NOCLDWAIT) == 0)
- {
- /* No.. Add the child status entry to the new parent's task group */
-
- group_addchild(ptcb->group, child);
- }
- else
- {
- /* Yes.. Discard the child status entry */
-
- group_freechild(child);
- }
-
- /* Either case is a success */
-
- ret = OK;
- }
- else
- {
- /* This would not be an error if the original parent's task group has
- * suppressed child exit status.
- */
-
- ret = ((otcb->group->tg_flags && GROUP_FLAG_NOCLDWAIT) == 0) ? -ENOENT : OK;
- }
-
-#else /* CONFIG_SCHED_CHILD_STATUS */
-
- DEBUGASSERT(otcb->nchildren > 0);
-
- otcb->nchildren--; /* The orignal parent now has one few children */
- ptcb->nchildren++; /* The new parent has one additional child */
- ret = OK;
-
-#endif /* CONFIG_SCHED_CHILD_STATUS */
-
-errout_with_ints:
- irqrestore(flags);
- return ret;
-}
-#endif
-#endif /* CONFIG_SCHED_HAVE_PARENT */
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-11 06:20:34 +0000