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Beginnings of definitions for the LPC1788; convert olimex-lpc1766stk to use kconfig-frontends

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git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5533 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2013-01-18 16:37:37 +00:00
parent 55b9700d59
commit 3ff155d048
17 changed files with 1821 additions and 1033 deletions
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nuttx/sched/task_reparent.c
+43 -46
View File
@@ -60,8 +60,8 @@
* Change the parent of a task.
*
* Parameters:
* oldpid - PID of the old parent task (0 if this task)
* newpid - PID ot the new parent task (0 for the parent of this task)
* 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:
@@ -69,50 +69,22 @@
*
*****************************************************************************/
int task_reparent(pid_t oldpid, pid_t newpid, pid_t chpid)
int task_reparent(pid_t ppid, pid_t chpid)
{
_TCB *oldtcb;
_TCB *newtcb;
_TCB *ptcb;
_TCB *chtcb;
_TCB *otcb;
pid_t opid;
irqstate_t flags;
int ret;
/* If oldpid is zero, then we are parent task. */
if (oldpid == 0)
{
oldpid = getpid();
}
/* Get the current parent task's TCB */
oldtcb = sched_gettcb(oldpid);
if (!oldtcb)
{
return -ESRCH;
}
/* Disable interrupts so that nothing can change from this point */
/* Disable interrupts so that nothing can change in the relatinoship of
* the three task: Child, current parent, and new parent.
*/
flags = irqsave();
/* If newpid is zero, then new is the parent of oldpid. */
if (newpid == 0)
{
newpid = oldtcb->parent;
}
/* Get the new parent task's TCB */
newtcb = sched_gettcb(newpid);
if (!newtcb)
{
ret = -ESRCH;
goto errout_with_ints;
}
/* Get the child tasks TCB */
/* Get the child tasks TCB (chtcb) */
chtcb = sched_gettcb(chpid);
if (!chtcb)
@@ -121,20 +93,45 @@ int task_reparent(pid_t oldpid, pid_t newpid, pid_t chpid)
goto errout_with_ints;
}
/* Verify that oldpid is the parent of chpid */
/* Get the PID of the child task's parent (opid) */
if (chtcb->parent != oldpid)
opid = chtcb->parent;
/* Get the TCB of the child task's parent (otcb) */
otcb = sched_gettcb(opid);
if (!otcb)
{
ret = -ECHILD;
ret = -ESRCH;
goto errout_with_ints;
}
/* Okay, reparent the child */
/* 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.
*/
DEBUGASSERT(oldtcb->nchildren > 0);
chtcb->parent = newpid;
oldtcb->nchildren--;
newtcb->nchildren++;
if (ppid == 0)
{
ppid = otcb->parent;
}
/* Get the new parent task's TCB (ptcb) */
ptcb = sched_gettcb(ppid);
if (!ptcb)
{
ret = -ESRCH;
goto errout_with_ints;
}
/* Then reparent the child */
DEBUGASSERT(otcb->nchildren > 0);
chtcb->parent = ppid; /* The task specified by ppid is the new parent */
otcb->nchildren--; /* The orignal parent now has one few children */
ptcb->nchildren++; /* The new parent has one additional child */
ret = OK;
errout_with_ints: