Implement user-mode work queues

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5712 42af7a65-404d-4744-a932-0658087f49c3

TODO

@@ -1,4 +1,4 @@
-NuttX TODO List (Last updated February 5, 2013)
+NuttX TODO List (Last updated March 5, 2013)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 This file summarizes known NuttX bugs, limitations, inconsistencies with 
@@ -6,7 +6,7 @@ standards, things that could be improved, and ideas for enhancements.
 
 nuttx/
 
- (11)  Task/Scheduler (sched/)
+ (10)  Task/Scheduler (sched/)
   (1)  Memory Managment (mm/)
   (3)  Signals (sched/, arch/)
   (2)  pthreads (sched/)
@@ -126,23 +126,6 @@ o Task/Scheduler (sched/)
   Status:      Open
   Priority:    Low -- There is no plan to implement this.
 
-  Title:       USER-SPACE WORK QUEUES
-  Description: There has been some use of work queues that has crept into some
-               user code.  I am thinking of NxWidgets::CNxTimer.  That timer
-               logic was originally implemented (correctly) using POSIX timers,
-               but was re-implemented using timed work.
-
-               The issue is that NxWidgets::CNxTimer is a user-space application
-               but the work queues are an OS internal feature.  This will be a
-               problem for KERNEL builds.  Hooks and definitions have been added
-               in include/nuttx/wqueue.h to support a user-space work queue, but
-               the corresponding logic has not been implemented.
-
-               The work queue logic will need to be moved from sched/ to libc/wqueue/
-  Status:      Open.  No work will probably be done until a functional KERNEL build
-               that includes NxWisges::CNxTimer is needed.
-  Priority:    Medium Low for now
-
   Title:       INCOMPATIBILITES WITH execv() AND execl()
   Description: Simplified 'execl()' and 'execv()' functions are provided by
                NuttX.  NuttX does not support processes and hence the concept