From c4f6f3ee887c0fa89c4ed5c311410363f6d61cb4 Mon Sep 17 00:00:00 2001
From: Doug Gilbert <dgilbert@us.ibm.com>
Date: Thu, 12 Jan 2012 10:32:19 -0600
Subject: Conditional Variable support

Change-Id: Ib715b3a4e775ef183244e8769c6560a85ac19104
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/612
Tested-by: Jenkins Server
Reviewed-by: A. Patrick Williams III <iawillia@us.ibm.com>
---
 src/usr/testcore/lib/synctest.H | 139 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)

(limited to 'src/usr/testcore/lib/synctest.H')

diff --git a/src/usr/testcore/lib/synctest.H b/src/usr/testcore/lib/synctest.H
index e1de74843..a5d15b3f2 100644
--- a/src/usr/testcore/lib/synctest.H
+++ b/src/usr/testcore/lib/synctest.H
@@ -32,8 +32,10 @@
 #include <sys/sync.h>
 #include <sys/task.h>
 #include <sys/time.h>
+#include <utility>
 
 #include <kernel/timemgr.H>
+#include <kernel/console.H>
 
 class SyncTest: public CxxTest::TestSuite
 {
@@ -80,10 +82,79 @@ class SyncTest: public CxxTest::TestSuite
             barrier_destroy(&barrier);
         }
 
+        void testConditionVariable()
+        {
+
+            mutex_init(&mutex);
+            sync_cond_init(&cond_var);
+
+            counter = 0;
+
+            barrier_init(&barrier,4);
+
+            TASK_INFO t1(this,1);
+            TASK_INFO t2(this,2);
+            TASK_INFO t3(this,3); 
+
+            task_create(watch_counter, &t1);
+            task_create(increment, &t2);
+            task_create(increment, &t3);
+
+            barrier_wait(&barrier);
+            TS_TRACE("Conditional Variable test final count = %ld",counter);
+            barrier_destroy(&barrier);
+            sync_cond_destroy(&cond_var);
+            mutex_destroy(&mutex);
+            // test is success if it completes w/o hang
+        }
+
+        void testConditionVariableBroadcast()
+        {
+            mutex_init(&mutex);
+            sync_cond_init(&cond_var);
+
+            counter = 0;
+
+            barrier_init(&barrier,5);
+
+            TASK_INFO t1(this,4);
+            TASK_INFO t2(this,5);
+            TASK_INFO t3(this,6); 
+            TASK_INFO t4(this,7);
+
+            task_create(watch_counter, &t1);
+            task_create(watch_counter, &t2);
+            task_create(increment1, &t3);
+            task_create(increment1, &t4);
+
+            barrier_wait(&barrier);
+            TS_TRACE("Conditional Variable test final count = %ld",counter);
+            barrier_destroy(&barrier);
+            sync_cond_destroy(&cond_var);
+            mutex_destroy(&mutex);
+            // test is success if it completes w/o hang
+        }
+
+
+
+            
+
     private:
 
+        enum 
+        { 
+            TO_COUNT = 10,
+            COUNT_SIGNAL = 13
+        };
+
+        typedef std::pair<SyncTest*, size_t> TASK_INFO;
+
         mutex_t mutex;
         barrier_t barrier;
+        sync_cond_t cond_var;
+
+        size_t counter;
+
 
         static void func1(void * i_p)
         {
@@ -127,6 +198,74 @@ class SyncTest: public CxxTest::TestSuite
             task_end();
         }
 
+        static void watch_counter(void * i_p)
+        {
+            TASK_INFO * info = (TASK_INFO *) i_p;
+            SyncTest * my = info->first;
+            TS_TRACE("CONDVAR task %ld. Start watching counter",info->second);
+            mutex_lock(&(my->mutex));
+            while(my->counter < COUNT_SIGNAL)
+            {
+                sync_cond_wait(&(my->cond_var),&(my->mutex));
+                TS_TRACE("CONDVAR task %ld. Condition signal received",
+                         info->second);
+                my->counter += 100;
+                TS_TRACE("CONDVAR task %ld. Counter = %ld",
+                         info->second,my->counter);
+            }
+            mutex_unlock(&(my->mutex));
+            barrier_wait(&(my->barrier));
+        }
+
+
+        static void increment(void * i_p)
+        {
+            TASK_INFO * info = (TASK_INFO *) i_p;
+            SyncTest * my = info->first;
+            TS_TRACE("CONDVAR task %ld. start Increment counter",info->second);
+            for(size_t i = 0; i < TO_COUNT; ++i)
+            {
+                mutex_lock(&(my->mutex));
+                ++(my->counter);
+
+                if(my->counter == COUNT_SIGNAL)
+                {
+                    sync_cond_signal(&(my->cond_var));
+                    TS_TRACE("CONDVAR task %ld. INCR counter = %ld Threshold"
+                             " reached",info->second,my->counter);
+                }
+                TS_TRACE("CONDVAR task %ld INCR counter = %ld Unlocking mutex",
+                         info->second, my->counter);
+                mutex_unlock(&(my->mutex));
+                nanosleep(0,TEN_CTX_SWITCHES_NS);
+            }
+            barrier_wait(&(my->barrier));
+        }
+
+        static void increment1(void * i_p)
+        {
+            TASK_INFO * info = (TASK_INFO *) i_p;
+            SyncTest * my = info->first;
+            TS_TRACE("CONDVAR task %ld. start Increment counter",info->second);
+            for(size_t i = 0; i < TO_COUNT; ++i)
+            {
+                mutex_lock(&(my->mutex));
+                ++(my->counter);
+
+                if(my->counter == COUNT_SIGNAL)
+                {
+                    sync_cond_broadcast(&(my->cond_var));
+                    TS_TRACE("CONDVAR task %ld. INCR counter = %ld Threshold"
+                             " reached",info->second,my->counter);
+                }
+                TS_TRACE("CONDVAR task %ld INCR counter = %ld Unlocking mutex",
+                         info->second, my->counter);
+                mutex_unlock(&(my->mutex));
+                nanosleep(0,TEN_CTX_SWITCHES_NS);
+            }
+            barrier_wait(&(my->barrier));
+        }
+
 };
 #endif
 
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