Support task_wait / task_wait_tid syscalls:

    - Add task_end2 syscall to allow pthread_exit-like retval.
    - Add/maintain task states.
    - Create task parent/child tracking tree.
    - Add task_detach function.
    - Implement wait syscalls.

Make task_exec caller the parent of spawned task:

    Previously the task_exec call caused a message to the
    VFS task, which called task_create and returned the tid
    in response to the message.  This causes the parent of
    the spawned task to appear to be the VFS task.

    Modify task_exec / VFS handling to instead return the
    entry point address on the message and have task_exec call
    task_create directly itself.

Change-Id: I6b6796f45875de37b1ab01e7596639b073820b95
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/443
Tested-by: Jenkins Server
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
Reviewed-by: Andrew J. Geissler <andrewg@us.ibm.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/include/kernel/syscalls.H b/src/include/kernel/syscalls.H
index 70dd436be..553fbf158 100644
--- a/src/include/kernel/syscalls.H
+++ b/src/include/kernel/syscalls.H
@@ -49,6 +49,8 @@ namespace Systemcalls
         TASK_END = 2,
             /** task_affinity_migrate_to_master() */
         TASK_MIGRATE_TO_MASTER = 3,
+            /** task_wait() / task_wait_tid() */
+        TASK_WAIT,
 
             /** msgq_create() */
         MSGQ_CREATE,