o Don't add a scope system thread's KSE to the list of available

  KSEs when it's thread exits; allow the GC handler to do that.

o Make spinlock/spinlock critical regions.

The following were submitted by davidxu

  o Alow thr_switch() to take a null mailbox argument.

  o Better protect cancellation checks.

  o Don't set KSE specific data when creating new KSEs; rely on the
    first upcall of the KSE to set it.

  o Add the ability to set the maximum concurrency level and do this
    automatically.  We should have a way to enable/disable this with
    some sort of tunable because some applications may not want this
    to be the default.

  o Hold the scheduling lock across thread switch calls.

  o If scheduling of a thread fails, make sure to remove it from the list
    of active threads.

  o Better protect accesses to a joining threads when the target thread is
    exited and detached.

  o Remove some macro definitions that are now provided by <sys/kse.h>.

  o Don't leave the library in threaded mode if creation of the initial
    KSE fails.

  o Wakeup idle KSEs when there are threads ready to run.

  o Maintain the number of threads active in the priority queue.

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/libpthread/thread/thr_yield.c b/lib/libpthread/thread/thr_yield.c
index acaa3c5..dfe7278 100644
--- a/lib/libpthread/thread/thr_yield.c
+++ b/lib/libpthread/thread/thr_yield.c
@@ -46,8 +46,9 @@ _sched_yield(void)
 	curthread->slice_usec = -1;
 
 	/* Schedule the next thread: */
+	THR_LOCK_SWITCH(curthread);
 	_thr_sched_switch(curthread);
-
+	THR_UNLOCK_SWITCH(curthread);
 	/* Always return no error. */
 	return(0);
 }
@@ -62,5 +63,7 @@ _pthread_yield(void)
 	curthread->slice_usec = -1;
 
 	/* Schedule the next thread: */
+	THR_LOCK_SWITCH(curthread);
 	_thr_sched_switch(curthread);
+	THR_UNLOCK_SWITCH(curthread);
 }