task_delete() calls sched_unlock(); _exit must keep pre-emption disabled until...

task_delete() calls sched_unlock(); _exit must keep pre-emption disabled until pending queue emptied.


git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@167 42af7a65-404d-4744-a932-0658087f49c3