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Add framework to support task groups
git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5562 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
+70
-40
@@ -197,39 +197,28 @@ static inline void task_onexit(FAR _TCB *tcb, int status)
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****************************************************************************/
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#ifdef CONFIG_SCHED_HAVE_PARENT
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static inline void task_sigchild(FAR _TCB *tcb, int status)
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static inline void task_sigchild(FAR _TCB *ptcb, FAR _TCB *ctcb, int status)
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{
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FAR _TCB *ptcb;
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siginfo_t info;
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/* Only exiting tasks should generate SIGCHLD. pthreads use other
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* mechansims.
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/* Only the final exiting thread in a task group should generate SIGCHLD.
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* If task groups are not supported then we will report SIGCHLD when the
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* task exits.
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*/
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if ((tcb->flags & TCB_FLAG_TTYPE_MASK) == TCB_FLAG_TTYPE_TASK)
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{
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/* Keep things stationary through the following */
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sched_lock();
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/* Get the TCB of the receiving task */
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ptcb = sched_gettcb(tcb->parent);
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if (!ptcb)
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{
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/* The parent no longer exists... bail */
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sched_unlock();
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return;
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}
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#ifdef CONFIG_SCHED_CHILD_STATUS
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/* Check if the parent task has suppressed retention of child exit
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if (ctcb->group->tg_crefs == 1)
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#else
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if ((ctcb->flags & TCB_FLAG_TTYPE_MASK) == TCB_FLAG_TTYPE_TASK)
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#endif
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{
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#ifdef CONFIG_SCHED_CHILD_STATUS
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/* Check if the parent task group has suppressed retention of child exit
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* status information. Only 'tasks' report exit status, not pthreads.
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* pthreads have a different mechanism.
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*/
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if ((ptcb->flags & TCB_FLAG_NOCLDWAIT) == 0)
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if ((ptcb->group->tg_flags & GROUP_FLAG_NOCLDWAIT) == 0)
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{
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FAR struct child_status_s *child;
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@@ -255,15 +244,6 @@ static inline void task_sigchild(FAR _TCB *tcb, int status)
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ptcb->nchildren--;
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#endif
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/* Set the parent to an impossible PID. We do this because under
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* certain conditions, task_exithook() can be called multiple times.
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* If this function is called again, sched_gettcb() will fail on the
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* invalid parent PID above, nchildren will be decremented once and
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* all will be well.
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*/
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tcb->parent = INVALID_PROCESS_ID;
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/* Create the siginfo structure. We don't actually know the cause.
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* That is a bug. Let's just say that the child task just exit-ted
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* for now.
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@@ -272,7 +252,7 @@ static inline void task_sigchild(FAR _TCB *tcb, int status)
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info.si_signo = SIGCHLD;
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info.si_code = CLD_EXITED;
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info.si_value.sival_ptr = NULL;
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info.si_pid = tcb->pid;
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info.si_pid = ctcb->pid;
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info.si_status = status;
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/* Send the signal. We need to use this internal interface so that we
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@@ -280,11 +260,59 @@ static inline void task_sigchild(FAR _TCB *tcb, int status)
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*/
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(void)sig_received(ptcb, &info);
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sched_unlock();
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}
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}
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#else
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# define task_sigchild(tcb,status)
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# define task_sigchild(ptct,ctcb,status)
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#endif
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/****************************************************************************
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* Name: task_leavegroup
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*
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* Description:
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* Send the SIGCHILD signal to the parent thread
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*
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****************************************************************************/
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#ifdef CONFIG_SCHED_HAVE_PARENT
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static inline void task_leavegroup(FAR _TCB *ctcb, int status)
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{
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FAR _TCB *ptcb;
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/* Keep things stationary throughout the following */
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sched_lock();
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/* Get the TCB of the receiving, parent task. We do this early to
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* handle multiple calls to task_leavegroup. ctcb->parent is set to an
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* invalid value below and the following call will fail if we are
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* called again.
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*/
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ptcb = sched_gettcb(ctcb->parent);
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if (!ptcb)
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{
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/* The parent no longer exists... bail */
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sched_unlock();
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return;
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}
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/* Send SIGCHLD to all members of the parent's task group */
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task_sigchild(ptcb, ctcb, status);
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/* Set the parent to an impossible PID. We do this because under certain
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* conditions, task_exithook() can be called multiple times. If this
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* function is called again, sched_gettcb() will fail on the invalid
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* parent PID above and all will be well.
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*/
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ctcb->parent = INVALID_PROCESS_ID;
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sched_unlock();
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}
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#else
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# define task_leavegroup(ctcb,status)
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#endif
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/****************************************************************************
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@@ -363,9 +391,9 @@ void task_exithook(FAR _TCB *tcb, int status)
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task_onexit(tcb, status);
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/* Send SIGCHLD to the parent of the exit-ing task */
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/* Leave the task group */
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task_sigchild(tcb, status);
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task_leavegroup(tcb, status);
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/* Wakeup any tasks waiting for this task to exit */
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@@ -379,10 +407,12 @@ void task_exithook(FAR _TCB *tcb, int status)
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(void)lib_flushall(tcb->streams);
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#endif
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/* Discard any un-reaped child status (no zombies here!) */
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/* Leave the task group. Perhaps discarding any un-reaped child
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* status (no zombies here!)
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*/
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#if defined(CONFIG_SCHED_HAVE_PARENT) && defined(CONFIG_SCHED_CHILD_STATUS)
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task_removechildren(tcb);
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#ifdef HAVE_TASK_GROUP
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group_leave(tcb);
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#endif
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/* Free all file-related resources now. This gets called again
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