Add taskYIELD_WITHIN_API macro (#782)

Add taskYIELD_WITHIN_API macro for readability improvement.
diff --git a/event_groups.c b/event_groups.c
index 6b68c08..556637b 100644
--- a/event_groups.c
+++ b/event_groups.c
@@ -253,15 +253,7 @@
     {
         if( xAlreadyYielded == pdFALSE )
         {
-            #if ( configNUMBER_OF_CORES == 1 )
-            {
-                portYIELD_WITHIN_API();
-            }
-            #else /* #if ( configNUMBER_OF_CORES == 1 ) */
-            {
-                vTaskYieldWithinAPI();
-            }
-            #endif /* #if ( configNUMBER_OF_CORES == 1 ) */
+            taskYIELD_WITHIN_API();
         }
         else
         {
@@ -417,15 +409,7 @@
     {
         if( xAlreadyYielded == pdFALSE )
         {
-            #if ( configNUMBER_OF_CORES == 1 )
-            {
-                portYIELD_WITHIN_API();
-            }
-            #else /* #if ( configNUMBER_OF_CORES == 1 ) */
-            {
-                vTaskYieldWithinAPI();
-            }
-            #endif /* #if ( configNUMBER_OF_CORES == 1 ) */
+            taskYIELD_WITHIN_API();
         }
         else
         {
diff --git a/include/task.h b/include/task.h
index 8d6742c..4483518 100644
--- a/include/task.h
+++ b/include/task.h
@@ -3330,6 +3330,12 @@
 * SCHEDULER INTERNALS AVAILABLE FOR PORTING PURPOSES
 *----------------------------------------------------------*/
 
+#if ( configNUMBER_OF_CORES == 1 )
+    #define taskYIELD_WITHIN_API()    portYIELD_WITHIN_API()
+#else /* #if ( configNUMBER_OF_CORES == 1 ) */
+    #define taskYIELD_WITHIN_API()    vTaskYieldWithinAPI()
+#endif /* #if ( configNUMBER_OF_CORES == 1 ) */
+
 /*
  * THIS FUNCTION MUST NOT BE USED FROM APPLICATION CODE.  IT IS ONLY
  * INTENDED FOR USE WHEN IMPLEMENTING A PORT OF THE SCHEDULER AND IS
diff --git a/queue.c b/queue.c
index 91b9a0d..3bc9597 100644
--- a/queue.c
+++ b/queue.c
@@ -1129,15 +1129,7 @@
                  * is also a higher priority task in the pending ready list. */
                 if( xTaskResumeAll() == pdFALSE )
                 {
-                    #if ( configNUMBER_OF_CORES == 1 )
-                    {
-                        portYIELD_WITHIN_API();
-                    }
-                    #else /* #if ( configNUMBER_OF_CORES == 1 ) */
-                    {
-                        vTaskYieldWithinAPI();
-                    }
-                    #endif /* #if ( configNUMBER_OF_CORES == 1 ) */
+                    taskYIELD_WITHIN_API();
                 }
             }
             else
@@ -1616,15 +1608,7 @@
 
                 if( xTaskResumeAll() == pdFALSE )
                 {
-                    #if ( configNUMBER_OF_CORES == 1 )
-                    {
-                        portYIELD_WITHIN_API();
-                    }
-                    #else /* #if ( configNUMBER_OF_CORES == 1 ) */
-                    {
-                        vTaskYieldWithinAPI();
-                    }
-                    #endif /* #if ( configNUMBER_OF_CORES == 1 ) */
+                    taskYIELD_WITHIN_API();
                 }
                 else
                 {
@@ -1817,15 +1801,7 @@
 
                 if( xTaskResumeAll() == pdFALSE )
                 {
-                    #if ( configNUMBER_OF_CORES == 1 )
-                    {
-                        portYIELD_WITHIN_API();
-                    }
-                    #else /* #if ( configNUMBER_OF_CORES == 1 ) */
-                    {
-                        vTaskYieldWithinAPI();
-                    }
-                    #endif /* #if ( configNUMBER_OF_CORES == 1 ) */
+                    taskYIELD_WITHIN_API();
                 }
                 else
                 {
@@ -2013,15 +1989,7 @@
 
                 if( xTaskResumeAll() == pdFALSE )
                 {
-                    #if ( configNUMBER_OF_CORES == 1 )
-                    {
-                        portYIELD_WITHIN_API();
-                    }
-                    #else /* #if ( configNUMBER_OF_CORES == 1 ) */
-                    {
-                        vTaskYieldWithinAPI();
-                    }
-                    #endif /* #if ( configNUMBER_OF_CORES == 1 ) */
+                    taskYIELD_WITHIN_API();
                 }
                 else
                 {
diff --git a/tasks.c b/tasks.c
index 84bc87b..000767b 100644
--- a/tasks.c
+++ b/tasks.c
@@ -2195,11 +2195,7 @@
          * have put ourselves to sleep. */
         if( xAlreadyYielded == pdFALSE )
         {
-            #if ( configNUMBER_OF_CORES == 1 )
-                portYIELD_WITHIN_API();
-            #else
-                vTaskYieldWithinAPI();
-            #endif
+            taskYIELD_WITHIN_API();
         }
         else
         {
@@ -2251,11 +2247,7 @@
          * have put ourselves to sleep. */
         if( xAlreadyYielded == pdFALSE )
         {
-            #if ( configNUMBER_OF_CORES == 1 )
-                portYIELD_WITHIN_API();
-            #else
-                vTaskYieldWithinAPI();
-            #endif
+            taskYIELD_WITHIN_API();
         }
         else
         {
@@ -7253,15 +7245,7 @@
                      * section (some will yield immediately, others wait until the
                      * critical section exits) - but it is not something that
                      * application code should ever do. */
-                    #if ( configNUMBER_OF_CORES == 1 )
-                    {
-                        portYIELD_WITHIN_API();
-                    }
-                    #else
-                    {
-                        vTaskYieldWithinAPI();
-                    }
-                    #endif
+                    taskYIELD_WITHIN_API();
                 }
                 else
                 {
@@ -7344,15 +7328,7 @@
                      * section (some will yield immediately, others wait until the
                      * critical section exits) - but it is not something that
                      * application code should ever do. */
-                    #if ( configNUMBER_OF_CORES == 1 )
-                    {
-                        portYIELD_WITHIN_API();
-                    }
-                    #else
-                    {
-                        vTaskYieldWithinAPI();
-                    }
-                    #endif
+                    taskYIELD_WITHIN_API();
                 }
                 else
                 {
diff --git a/timers.c b/timers.c
index 0d7a0c0..f27caba 100644
--- a/timers.c
+++ b/timers.c
@@ -771,15 +771,7 @@
                          * block time to expire.  If a command arrived between the
                          * critical section being exited and this yield then the yield
                          * will not cause the task to block. */
-                        #if ( configNUMBER_OF_CORES == 1 )
-                        {
-                            portYIELD_WITHIN_API();
-                        }
-                        #else /* #if ( configNUMBER_OF_CORES == 1 ) */
-                        {
-                            vTaskYieldWithinAPI();
-                        }
-                        #endif /* #if ( configNUMBER_OF_CORES == 1 ) */
+                        taskYIELD_WITHIN_API();
                     }
                     else
                     {