Diff: Source/portable/MemMang/heap_1.c

Revision:

0:8e57f3e9cc89

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Source/portable/MemMang/heap_1.c	Fri Jan 24 14:56:04 2014 +0000
@@ -0,0 +1,170 @@
+/*
+    FreeRTOS V7.6.0 - Copyright (C) 2013 Real Time Engineers Ltd. 
+    All rights reserved
+
+    VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
+
+    ***************************************************************************
+     *                                                                       *
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+    ***************************************************************************
+
+    This file is part of the FreeRTOS distribution.
+
+    FreeRTOS is free software; you can redistribute it and/or modify it under
+    the terms of the GNU General Public License (version 2) as published by the
+    Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
+
+    >>! NOTE: The modification to the GPL is included to allow you to distribute
+    >>! a combined work that includes FreeRTOS without being obliged to provide
+    >>! the source code for proprietary components outside of the FreeRTOS
+    >>! kernel.
+
+    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+    FOR A PARTICULAR PURPOSE.  Full license text is available from the following
+    link: http://www.freertos.org/a00114.html
+
+    1 tab == 4 spaces!
+
+    ***************************************************************************
+     *                                                                       *
+     *    Having a problem?  Start by reading the FAQ "My application does   *
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+    ***************************************************************************
+
+    http://www.FreeRTOS.org - Documentation, books, training, latest versions,
+    license and Real Time Engineers Ltd. contact details.
+
+    http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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+    compatible FAT file system, and our tiny thread aware UDP/IP stack.
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+    engineered and independently SIL3 certified version for use in safety and
+    mission critical applications that require provable dependability.
+
+    1 tab == 4 spaces!
+*/
+
+
+/*
+ * The simplest possible implementation of pvPortMalloc().  Note that this
+ * implementation does NOT allow allocated memory to be freed again.
+ *
+ * See heap_2.c, heap_3.c and heap_4.c for alternative implementations, and the
+ * memory management pages of http://www.FreeRTOS.org for more information.
+ */
+#include <stdlib.h>
+
+/* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
+all the API functions to use the MPU wrappers.  That should only be done when
+task.h is included from an application file. */
+#define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
+
+#include "FreeRTOS.h"
+#include "task.h"
+
+#undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
+
+/* A few bytes might be lost to byte aligning the heap start address. */
+#define configADJUSTED_HEAP_SIZE	( configTOTAL_HEAP_SIZE - portBYTE_ALIGNMENT )
+
+/* Allocate the memory for the heap. */
+static unsigned char ucHeap[ configTOTAL_HEAP_SIZE ];
+static size_t xNextFreeByte = ( size_t ) 0;
+
+/*-----------------------------------------------------------*/
+
+void *pvPortMalloc( size_t xWantedSize )
+{
+void *pvReturn = NULL;
+static unsigned char *pucAlignedHeap = NULL;
+
+	/* Ensure that blocks are always aligned to the required number of bytes. */
+	#if portBYTE_ALIGNMENT != 1
+		if( xWantedSize & portBYTE_ALIGNMENT_MASK )
+		{
+			/* Byte alignment required. */
+			xWantedSize += ( portBYTE_ALIGNMENT - ( xWantedSize & portBYTE_ALIGNMENT_MASK ) );
+		}
+	#endif
+
+	vTaskSuspendAll();
+	{
+		if( pucAlignedHeap == NULL )
+		{
+			/* Ensure the heap starts on a correctly aligned boundary. */
+			pucAlignedHeap = ( unsigned char * ) ( ( ( portPOINTER_SIZE_TYPE ) &ucHeap[ portBYTE_ALIGNMENT ] ) & ( ( portPOINTER_SIZE_TYPE ) ~portBYTE_ALIGNMENT_MASK ) );
+		}
+
+		/* Check there is enough room left for the allocation. */
+		if( ( ( xNextFreeByte + xWantedSize ) < configADJUSTED_HEAP_SIZE ) &&
+			( ( xNextFreeByte + xWantedSize ) > xNextFreeByte )	)/* Check for overflow. */
+		{
+			/* Return the next free byte then increment the index past this
+			block. */
+			pvReturn = pucAlignedHeap + xNextFreeByte;
+			xNextFreeByte += xWantedSize;
+		}
+
+		traceMALLOC( pvReturn, xWantedSize );
+	}	
+	xTaskResumeAll();
+
+	#if( configUSE_MALLOC_FAILED_HOOK == 1 )
+	{
+		if( pvReturn == NULL )
+		{
+			extern void vApplicationMallocFailedHook( void );
+			vApplicationMallocFailedHook();
+		}
+	}
+	#endif
+
+	return pvReturn;
+}
+/*-----------------------------------------------------------*/
+
+void vPortFree( void *pv )
+{
+	/* Memory cannot be freed using this scheme.  See heap_2.c, heap_3.c and
+	heap_4.c for alternative implementations, and the memory management pages of
+	http://www.FreeRTOS.org for more information. */
+	( void ) pv;
+
+	/* Force an assert as it is invalid to call this function. */
+	configASSERT( pv == NULL );
+}
+/*-----------------------------------------------------------*/
+
+void vPortInitialiseBlocks( void )
+{
+	/* Only required when static memory is not cleared. */
+	xNextFreeByte = ( size_t ) 0;
+}
+/*-----------------------------------------------------------*/
+
+size_t xPortGetFreeHeapSize( void )
+{
+	return ( configADJUSTED_HEAP_SIZE - xNextFreeByte );
+}
+
+
+