new file mode 100644
--- /dev/null
+++ b/packages/kernel/current/tests/sync3.cxx
@@ -0,0 +1,179 @@
+//==========================================================================
+//
+//        sync3.cxx
+//
+//        Sync test 3 -- tests priorities and priority inheritance
+//
+//==========================================================================
+//####COPYRIGHTBEGIN####
+//
+// -------------------------------------------
+// The contents of this file are subject to the Cygnus eCos Public License
+// Version 1.0 (the "License"); you may not use this file except in
+// compliance with the License.  You may obtain a copy of the License at
+// http://sourceware.cygnus.com/ecos
+// 
+// Software distributed under the License is distributed on an "AS IS"
+// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the
+// License for the specific language governing rights and limitations under
+// the License.
+// 
+// The Original Code is eCos - Embedded Cygnus Operating System, released
+// September 30, 1998.
+// 
+// The Initial Developer of the Original Code is Cygnus.  Portions created
+// by Cygnus are Copyright (C) 1998 Cygnus Solutions.  All Rights Reserved.
+// -------------------------------------------
+//
+//####COPYRIGHTEND####
+//==========================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):     dsm
+// Contributors:    dsm
+// Date:          1998-02-18
+// Description: 
+//     Creates mutexes and threads to set up starvation condition.
+//     Checks simple priority inheritance cures this.
+//     
+//     The starvation condition is caused by the highest priority
+//     thread, t0 waiting on a mutex which is never released because
+//     it is held by t2.  t2 never releases it because t1 will be
+//     running at a priority level higher than t2 (but lower than t0).
+//     
+//     With priority inheritance enabled, t2 will inherit its priority
+//     from t0 when t0 tries to grab the mutex.
+//     
+// Options:
+//     CYGIMP_THREAD_PRIORITY
+//     CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INHERITANCE
+//     CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INHERITANCE_SIMPLE
+//####DESCRIPTIONEND####
+
+#include <pkgconf/kernel.h>
+
+#include <cyg/kernel/thread.hxx>
+#include <cyg/kernel/thread.inl>
+#include <cyg/kernel/sched.hxx>
+#include <cyg/kernel/mutex.hxx>
+#include <cyg/kernel/sema.hxx>
+
+#include <cyg/infra/testcase.h>
+
+#include <cyg/kernel/sched.inl>
+
+#ifndef CYGIMP_THREAD_PRIORITY
+#error "Thread priorities disabled"
+#endif
+
+#define NTHREADS 3
+
+#include "testaux.hxx"
+
+static Cyg_Mutex m0;
+static Cyg_Binary_Semaphore s0, s1, s2;
+
+static cyg_ucount8 m0d = 9;
+
+static void check_priorities_normal()
+{
+    CHECK( 5 == thread[0]->get_priority());
+    CHECK( 6 == thread[1]->get_priority());
+    CHECK( 7 == thread[2]->get_priority());
+}
+
+static void check_priorities_inherited()
+{
+    CHECK( 5 == thread[0]->get_priority());
+    CHECK( 6 == thread[1]->get_priority());
+#ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INHERITANCE
+    CHECK( 5 == thread[2]->get_current_priority());
+#endif
+    CHECK( 7 == thread[2]->get_priority());
+
+}
+
+static void entry0( CYG_ADDRWORD data )
+{
+    s0.wait();			// wait until t2 has gained m0.lock
+    check_priorities_normal();
+    m0.lock(); {
+        check_priorities_normal();
+	CHECK( 2 == m0d );
+	m0d = 0;
+    } m0.unlock();
+    check_priorities_normal();
+#ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INHERITANCE
+    CYG_TEST_PASS_FINISH("Sync 3 OK -- priority inheritance worked");
+#else
+    CYG_TEST_FAIL_FINISH("Sync 3: thread not starved");
+#endif
+    // NOT REACHED
+}
+
+static void entry1( CYG_ADDRWORD data )
+{
+    s1.wait();
+    // The delay below will allow testing of the priority inheritance
+    // mechanism when scheduler does not guarantee to schedule threads
+    // in strict priority order.
+    for ( volatile cyg_ucount32 i=0; i < 100000; i++ )
+	; // math is hard
+
+#ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INHERITANCE
+    // thread0 should have stopped by this point
+    CYG_TEST_FAIL_FINISH("Sync 3: priority inheritance mechanism failed");
+#else
+    // With strict priority scheduling and no priority inheritance
+    // this is expected to happen.
+    CYG_TEST_PASS_FINISH("Sync 3 OK");
+#endif
+    CYG_TEST_FAIL_FINISH("Not reached");
+}
+
+void entry2( CYG_ADDRWORD data )
+{
+    m0.lock(); {
+	CHECK( 9 == m0d );
+        check_priorities_normal();
+	s0.post();		// Now I have lock on m0, wake t0 then t1 
+        check_priorities_inherited();
+	s1.post();
+        check_priorities_inherited();
+	m0d = 2;
+    } m0.unlock();
+    check_priorities_normal();
+    m0.lock(); {
+        check_priorities_normal();
+	CHECK( 0 == m0d );
+	m0d = 21;
+	s2.wait();		// never posted
+    } m0.unlock();
+}
+
+
+
+void sync3_main(void)
+{
+    CYG_TEST_INIT();
+
+    new_thread( entry0, 0);
+    new_thread( entry1, 1);
+    new_thread( entry2, 2);
+
+    thread[0]->set_priority(5);
+    thread[1]->set_priority(6);
+    thread[2]->set_priority(7);
+
+    Cyg_Scheduler::start();
+
+    CYG_TEST_FAIL_FINISH("Not reached");
+}
+
+externC void
+cyg_start( void )
+{
+    sync3_main();
+}
+   
+// EOF sync3.cxx