o Eliminate upcall for PTHREAD_SYSTEM_SCOPE thread, now it

  is system bound thread and when it is blocked, no upcall is generated.

o Add ability to libkse to allow it run in pure 1:1 threading mode,
  defining SYSTEM_SCOPE_ONLY in Makefile can turn on this option.

o Eliminate code for installing dummy signal handler for sigwait call.

o Add hash table to find thread.

Reviewed by: deischen

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/libpthread/thread/thr_yield.c b/lib/libpthread/thread/thr_yield.c
index b41072f..5c24113 100644
--- a/lib/libpthread/thread/thr_yield.c
+++ b/lib/libpthread/thread/thr_yield.c
@@ -42,6 +42,9 @@ _sched_yield(void)
 {
 	struct pthread	*curthread = _get_curthread();
 
+	if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM)
+		return (__sys_sched_yield());
+
 	/* Reset the accumulated time slice value for the current thread: */
 	curthread->slice_usec = -1;
 
@@ -57,6 +60,11 @@ _pthread_yield(void)
 {
 	struct pthread	*curthread = _get_curthread();
 
+	if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM) {
+		__sys_sched_yield();
+		return;
+	}
+
 	/* Reset the accumulated time slice value for the current thread: */
 	curthread->slice_usec = -1;