NetworkBufferDescriptor_t *pxReturn = NULL;\r
size_t uxCount;\r
\r
- if( ( xRequestedSizeBytes != 0u ) && ( xRequestedSizeBytes < ( size_t ) baMINIMAL_BUFFER_SIZE ) )\r
+ if( xNetworkBufferSemaphore != NULL )\r
{\r
- /* ARP packets can replace application packets, so the storage must be\r
- at least large enough to hold an ARP. */\r
- xRequestedSizeBytes = baMINIMAL_BUFFER_SIZE;\r
- }\r
-\r
- /* Add 2 bytes to xRequestedSizeBytes and round up xRequestedSizeBytes\r
- to the nearest multiple of N bytes, where N equals 'sizeof( size_t )'. */\r
- xRequestedSizeBytes += 2u;\r
- if( ( xRequestedSizeBytes & ( sizeof( size_t ) - 1u ) ) != 0u )\r
- {\r
- xRequestedSizeBytes = ( xRequestedSizeBytes | ( sizeof( size_t ) - 1u ) ) + 1u;\r
- }\r
-\r
- /* If there is a semaphore available, there is a network buffer available. */\r
- if( xSemaphoreTake( xNetworkBufferSemaphore, xBlockTimeTicks ) == pdPASS )\r
- {\r
- /* Protect the structure as it is accessed from tasks and interrupts. */\r
- taskENTER_CRITICAL();\r
+ if( ( xRequestedSizeBytes != 0u ) && ( xRequestedSizeBytes < ( size_t ) baMINIMAL_BUFFER_SIZE ) )\r
{\r
- pxReturn = ( NetworkBufferDescriptor_t * ) listGET_OWNER_OF_HEAD_ENTRY( &xFreeBuffersList );\r
- uxListRemove( &( pxReturn->xBufferListItem ) );\r
+ /* ARP packets can replace application packets, so the storage must be\r
+ at least large enough to hold an ARP. */\r
+ xRequestedSizeBytes = baMINIMAL_BUFFER_SIZE;\r
}\r
- taskEXIT_CRITICAL();\r
-\r
- /* Reading UBaseType_t, no critical section needed. */\r
- uxCount = listCURRENT_LIST_LENGTH( &xFreeBuffersList );\r
\r
- if( uxMinimumFreeNetworkBuffers > uxCount )\r
+ /* Add 2 bytes to xRequestedSizeBytes and round up xRequestedSizeBytes\r
+ to the nearest multiple of N bytes, where N equals 'sizeof( size_t )'. */\r
+ xRequestedSizeBytes += 2u;\r
+ if( ( xRequestedSizeBytes & ( sizeof( size_t ) - 1u ) ) != 0u )\r
{\r
- uxMinimumFreeNetworkBuffers = uxCount;\r
+ xRequestedSizeBytes = ( xRequestedSizeBytes | ( sizeof( size_t ) - 1u ) ) + 1u;\r
}\r
\r
- /* Allocate storage of exactly the requested size to the buffer. */\r
- configASSERT( pxReturn->pucEthernetBuffer == NULL );\r
- if( xRequestedSizeBytes > 0 )\r
+ /* If there is a semaphore available, there is a network buffer available. */\r
+ if( xSemaphoreTake( xNetworkBufferSemaphore, xBlockTimeTicks ) == pdPASS )\r
{\r
- /* Extra space is obtained so a pointer to the network buffer can\r
- be stored at the beginning of the buffer. */\r
- pxReturn->pucEthernetBuffer = ( uint8_t * ) pvPortMalloc( xRequestedSizeBytes + ipBUFFER_PADDING );\r
+ /* Protect the structure as it is accessed from tasks and interrupts. */\r
+ taskENTER_CRITICAL();\r
+ {\r
+ pxReturn = ( NetworkBufferDescriptor_t * ) listGET_OWNER_OF_HEAD_ENTRY( &xFreeBuffersList );\r
+ uxListRemove( &( pxReturn->xBufferListItem ) );\r
+ }\r
+ taskEXIT_CRITICAL();\r
+\r
+ /* Reading UBaseType_t, no critical section needed. */\r
+ uxCount = listCURRENT_LIST_LENGTH( &xFreeBuffersList );\r
\r
- if( pxReturn->pucEthernetBuffer == NULL )\r
+ if( uxMinimumFreeNetworkBuffers > uxCount )\r
{\r
- /* The attempt to allocate storage for the buffer payload failed,\r
- so the network buffer structure cannot be used and must be\r
- released. */\r
- vReleaseNetworkBufferAndDescriptor( pxReturn );\r
- pxReturn = NULL;\r
+ uxMinimumFreeNetworkBuffers = uxCount;\r
}\r
- else\r
+\r
+ /* Allocate storage of exactly the requested size to the buffer. */\r
+ configASSERT( pxReturn->pucEthernetBuffer == NULL );\r
+ if( xRequestedSizeBytes > 0 )\r
{\r
- /* Store a pointer to the network buffer structure in the\r
- buffer storage area, then move the buffer pointer on past the\r
- stored pointer so the pointer value is not overwritten by the\r
- application when the buffer is used. */\r
- *( ( NetworkBufferDescriptor_t ** ) ( pxReturn->pucEthernetBuffer ) ) = pxReturn;\r
- pxReturn->pucEthernetBuffer += ipBUFFER_PADDING;\r
-\r
- /* Store the actual size of the allocated buffer, which may be\r
- greater than the original requested size. */\r
- pxReturn->xDataLength = xRequestedSizeBytes;\r
-\r
- #if( ipconfigUSE_LINKED_RX_MESSAGES != 0 )\r
+ /* Extra space is obtained so a pointer to the network buffer can\r
+ be stored at the beginning of the buffer. */\r
+ pxReturn->pucEthernetBuffer = ( uint8_t * ) pvPortMalloc( xRequestedSizeBytes + ipBUFFER_PADDING );\r
+\r
+ if( pxReturn->pucEthernetBuffer == NULL )\r
+ {\r
+ /* The attempt to allocate storage for the buffer payload failed,\r
+ so the network buffer structure cannot be used and must be\r
+ released. */\r
+ vReleaseNetworkBufferAndDescriptor( pxReturn );\r
+ pxReturn = NULL;\r
+ }\r
+ else\r
{\r
- /* make sure the buffer is not linked */\r
- pxReturn->pxNextBuffer = NULL;\r
+ /* Store a pointer to the network buffer structure in the\r
+ buffer storage area, then move the buffer pointer on past the\r
+ stored pointer so the pointer value is not overwritten by the\r
+ application when the buffer is used. */\r
+ *( ( NetworkBufferDescriptor_t ** ) ( pxReturn->pucEthernetBuffer ) ) = pxReturn;\r
+ pxReturn->pucEthernetBuffer += ipBUFFER_PADDING;\r
+\r
+ /* Store the actual size of the allocated buffer, which may be\r
+ greater than the original requested size. */\r
+ pxReturn->xDataLength = xRequestedSizeBytes;\r
+\r
+ #if( ipconfigUSE_LINKED_RX_MESSAGES != 0 )\r
+ {\r
+ /* make sure the buffer is not linked */\r
+ pxReturn->pxNextBuffer = NULL;\r
+ }\r
+ #endif /* ipconfigUSE_LINKED_RX_MESSAGES */\r
}\r
- #endif /* ipconfigUSE_LINKED_RX_MESSAGES */\r
}\r
- }\r
- else\r
- {\r
- /* A descriptor is being returned without an associated buffer being\r
- allocated. */\r
+ else\r
+ {\r
+ /* A descriptor is being returned without an associated buffer being\r
+ allocated. */\r
+ }\r
}\r
}\r
\r
projects / freertos / blobdiff