Kernel changes:

+ Support tickless idle when configUSE_PREEMPTION is 0 (previously tickless idle was only supported when the pre-emptive scheduler was being used).
+ If a stack was statically allocated, then don't try freeing it if the TCB cannot be allocated.
+ Remove use of INCLUDE_xEventGroupsSetBitsFromISR() pre-processor macro, as it was not tested anyway.

Demo app changes:

+ Updated SAM4L Atmel Studio project to use Atmel Studio 7.

FreeRTOS/Source/include/FreeRTOS.h

@@ -247,10 +247,6 @@ extern "C" {
 	#define INCLUDE_xTaskResumeFromISR 1
 #endif
 
-#ifndef INCLUDE_xEventGroupSetBitFromISR
-	#define INCLUDE_xEventGroupSetBitFromISR 0
-#endif
-
 #ifndef INCLUDE_xTimerPendFunctionCall
 	#define INCLUDE_xTimerPendFunctionCall 0
 #endif
@@ -405,6 +401,10 @@ extern "C" {
 	#define traceMOVED_TASK_TO_READY_STATE( pxTCB )
 #endif
 
+#ifndef tracePOST_MOVED_TASK_TO_READY_STATE
+	#define tracePOST_MOVED_TASK_TO_READY_STATE( pxTCB )
+#endif
+
 #ifndef traceQUEUE_CREATE
 	#define traceQUEUE_CREATE( pxNewQueue )
 #endif
@@ -821,7 +821,7 @@ V8 if desired. */
 
 /* Set configUSE_TASK_FPU_SUPPORT to 0 to omit floating point support even
 if floating point hardware is otherwise supported by the FreeRTOS port in use.
-This constant is not supported by all FreeRTOS ports that include floating 
+This constant is not supported by all FreeRTOS ports that include floating
 point support. */
 #ifndef configUSE_TASK_FPU_SUPPORT
 	#define configUSE_TASK_FPU_SUPPORT 1

FreeRTOS/Source/include/event_groups.h

@@ -376,7 +376,7 @@ EventBits_t xEventGroupClearBits( EventGroupHandle_t xEventGroup, const EventBit
 		}
   }
    </pre>
- * \defgroup xEventGroupSetBitsFromISR xEventGroupSetBitsFromISR
+ * \defgroup xEventGroupClearBitsFromISR xEventGroupClearBitsFromISR
  * \ingroup EventGroup
  */
 #if( configUSE_TRACE_FACILITY == 1 )
@@ -470,7 +470,7 @@ EventBits_t xEventGroupSetBits( EventGroupHandle_t xEventGroup, const EventBits_
  * Setting bits in an event group is not a deterministic operation because there
  * are an unknown number of tasks that may be waiting for the bit or bits being
  * set.  FreeRTOS does not allow nondeterministic operations to be performed in
- * interrupts or from critical sections.  Therefore xEventGroupSetBitFromISR()
+ * interrupts or from critical sections.  Therefore xEventGroupSetBitsFromISR()
  * sends a message to the timer task to have the set operation performed in the
  * context of the timer task - where a scheduler lock is used in place of a
  * critical section.

FreeRTOS/Source/include/projdefs.h

@@ -107,6 +107,7 @@ typedef void (*TaskFunction_t)( void * );
 itself. */
 #define pdFREERTOS_ERRNO_NONE			0	/* No errors */
 #define	pdFREERTOS_ERRNO_ENOENT			2	/* No such file or directory */
+#define	pdFREERTOS_ERRNO_EINTR			4	/* Interrupted system call */
 #define	pdFREERTOS_ERRNO_EIO			5	/* I/O error */
 #define	pdFREERTOS_ERRNO_ENXIO			6	/* No such device or address */
 #define	pdFREERTOS_ERRNO_EBADF			9	/* Bad file number */