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+//==========================================================================
+//
+//        sync2.cxx
+//
+//        Sync test 2 -- test of different locking mechanisms
+//
+//==========================================================================
+//####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 some threads and tests the various synchronization
+//     mechanisms.  Four threads are created t0..t3.  t0 and t3 grab a
+//     mutex and check they have exclusive access to shared variable.
+//     t0,t1,t2 post each other in a loop with a semaphore so that
+//     only one is running at any time.  t1,t2,t3 do a similar thing
+//     with counting semaphores, except that there are two active
+//     threads.
+// Omissions:
+//     Doesn't test condition variables
+//                
+//####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>
+
+#define NTHREADS 4
+
+#include "testaux.hxx"
+
+static Cyg_Mutex m0;
+static Cyg_Binary_Semaphore s0, s1, s2(1);
+static Cyg_Counting_Semaphore cs0, cs1, cs2, cs3;
+
+static const cyg_ucount16 n = 1000; 
+static cyg_ucount8 m0d=99, sd=2, cd0=99, cd1=99;
+
+static void entry0( CYG_ADDRWORD data )
+{
+    for(cyg_ucount16 i=0; i<n; i++) {
+	s2.wait();
+	CHECK( 2 == sd );
+	sd = 0;
+	m0.lock(); {
+	    m0d = 0;
+	    s0.post();
+	    CHECK( 0 == m0d );
+	} m0.unlock();
+    }
+    // wait for 3 explicit posts to indicate threads have stopped.
+    for(cyg_ucount8 i=0; i<3; i++)
+	cs3.wait();
+
+    CHECK( ! s0.posted() );
+    CHECK( ! s1.posted() );
+    CHECK(   s2.posted() );
+
+    CHECK( 0 == cs0.peek() );
+    CHECK( 0 == cs1.peek() );
+    CHECK( 0 == cs2.peek() );
+    CHECK( 0 == cs3.peek() );
+
+    CHECK( 0 == cd0 );
+    CHECK( 0 == cd1 );
+    CYG_TEST_PASS_FINISH("Sync 2 OK");
+    CYG_TEST_FAIL_FINISH("Not reached");
+}
+
+static void entry1( CYG_ADDRWORD data )
+{
+    for(cyg_ucount16 i=0; i<n; i++) {
+	s0.wait();
+	CHECK( 0 == sd );
+	sd = 1;
+	cd0 = 1;
+	cs1.post();
+	cd1 = 1;
+	cs1.post();
+	s1.post();
+	cs0.wait();
+	CHECK( 0 == cd0 );
+	cs0.wait();
+	CHECK( 0 == cd1 );
+    }
+    cs3.post();
+    s0.wait();
+    CYG_TEST_FAIL_FINISH("Not reached");
+}
+
+static void entry2( CYG_ADDRWORD data )
+{
+    for(cyg_ucount16 i=0; i<n; i++) {
+	s1.wait();
+	CHECK( 1 == sd );
+	sd = 2;
+	cs1.wait();
+	CHECK( 1 == cd0 );
+	cd0 = 2;
+	cs2.post();
+	s2.post();
+	cs1.wait();
+	CHECK( 1 == cd1 );
+	cd1 = 2;
+	cs2.post();
+    }
+    cs3.post();
+    s1.wait();
+    CYG_TEST_FAIL_FINISH("Not reached");
+}
+
+static void entry3( CYG_ADDRWORD data )
+{
+    for(cyg_ucount16 i=0; i < n*2; i++)  {
+	cs2.wait();
+	CHECK( 2 == cd0 || 2 == cd1 );
+	m0.lock(); {
+	    m0d = 3;
+	    if( 2 == cd0 ) 
+		cd0 = 0;
+	    else {
+		CHECK( 2 == cd1 );
+		cd1 = 0;
+	    }
+	    cs0.post();
+	    CHECK( 3 == m0d );
+	} m0.unlock();
+    }
+    cs3.post();
+    cs1.wait();
+    CYG_TEST_FAIL_FINISH("Not reached");
+}
+
+
+void sync2_main(void)
+{
+    CYG_TEST_INIT();
+
+    new_thread(entry0, 0);
+    new_thread(entry1, 1);
+    new_thread(entry2, 2);
+    new_thread(entry3, 3);
+
+    Cyg_Scheduler::start();
+
+    CYG_TEST_PASS_FINISH("Not reached");
+}
+
+externC void
+cyg_start( void )
+{
+    sync2_main();
+}
+
+// EOF sync2.cxx