为更好地发挥C6678的多核性能,需要用到多核协作。幸运的是,我们可以使用官方提供的IPC模块。
IPC=Inter-Processor Communication, 核间通信,粗略来说就是多核之间进行信息、数据交换。
作为入门篇,本文不打算深入讨论IPC,仅仅列出自带的两个简单示例:Notify和MessageQ.
"通知"(Notify)模型
"消息队列"(MessageQ)模型
以下介绍Notify示例的创建过程以及测试结果。
首先新建一个项目,取名demo_ipcNotify,项目类型从模板中选择
选择"IPC and I/O Examples"分支下的"C6678 Examples"
然后【Next】,在XDCtools version选择3.23.4.60(不带"core"后缀的那一个)
创建并编译链接无错误之后执行Debug
建议勾选下方的"Create a debug group for selected cores"
如果没有选,可以在稍后执行如下操作
分组的好处是,当有多个核心加载时,不必一一启动,只需要在组别上点击启动(分组下所有核心全部启动)
这样做虽然不是必要的,但建议这样做。
如果勾选了分组,将会是如下这个样子,测试的时候只需在"Group 1"上点击一次【Step On(继续将执行)】
以下是测试示例的输出(中间有部分省略)
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- [C66xx_6] main: MultiProc id = 6
- main: MultiProc name = CORE6
- [C66xx_7] main: MultiProc id = 7
- main: MultiProc name = CORE7
- [C66xx_0] main: MultiProc id = 0
- [C66xx_1] main: MultiProc id = 1
- [C66xx_2] main: MultiProc id = 2
- [C66xx_3] main: MultiProc id = 3
- [C66xx_4] main: MultiProc id = 4
- [C66xx_5] main: MultiProc id = 5
- [C66xx_0] main: MultiProc name = CORE0
- [C66xx_1] main: MultiProc name = CORE1
- [C66xx_2] main: MultiProc name = CORE2
- [C66xx_3] main: MultiProc name = CORE3
- [C66xx_4] main: MultiProc name = CORE4
- [C66xx_5] main: MultiProc name = CORE5
- [C66xx_0] tsk1_func: Sent request #0 to CORE1
- [C66xx_1] tsk1_func: Received request #1 from CORE0
- tsk1_func: Sent request #1 to CORE2
- [C66xx_2] tsk1_func: Received request #1 from CORE1
- tsk1_func: Sent request #1 to CORE3
- [C66xx_3] tsk1_func: Received request #1 from CORE2
- tsk1_func: Sent request #1 to CORE4
- ///省略///
- [C66xx_3] tsk1_func: Received request #10 from CORE2
- tsk1_func: Sent request #10 to CORE4
- Test completed
- [C66xx_4] tsk1_func: Received request #10 from CORE3
- tsk1_func: Sent request #10 to CORE5
- Test completed
- [C66xx_5] tsk1_func: Received request #10 from CORE4
- tsk1_func: Sent request #10 to CORE6
- Test completed
- [C66xx_6] tsk1_func: Received request #10 from CORE5
- tsk1_func: Sent request #10 to CORE7
- Test completed
- [C66xx_7] tsk1_func: Received request #10 from CORE6
- tsk1_func: Sent request #10 to CORE0
- Test completed
- [C66xx_0] tsk1_func: Received request #10 from CORE7
- Test completed
类似的可以新建一个MessageQ示例项目
后续步骤同上,测试的输出如下(中间有部分省略)
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- [C66xx_1] Start the main loop
- [C66xx_5] Start the main loop
- [C66xx_7] Start the main loop
- [C66xx_6] Start the main loop
- [C66xx_0] Start the main loop
- [C66xx_2] Start the main loop
- [C66xx_3] Start the main loop
- [C66xx_4] Start the main loop
- [C66xx_0] Sending a message #1 to CORE1
- [C66xx_1] Sending a message #1 to CORE2
- [C66xx_2] Sending a message #1 to CORE3
- [C66xx_3] Sending a message #1 to CORE4
- [C66xx_4] Sending a message #1 to CORE5
- [C66xx_5] Sending a message #1 to CORE6
- [C66xx_6] Sending a message #1 to CORE7
- [C66xx_7] Sending a message #1 to CORE0
- ///省略///
- [C66xx_5] Sending a message #9 to CORE6
- [C66xx_6] Sending a message #9 to CORE7
- [C66xx_7] Sending a message #9 to CORE0
- [C66xx_0] Sending a message #10 to CORE1
- [C66xx_1] Sending a message #10 to CORE2
- The test is complete
- [C66xx_2] Sending a message #10 to CORE3
- The test is complete
- [C66xx_3] Sending a message #10 to CORE4
- The test is complete
- [C66xx_4] Sending a message #10 to CORE5
- The test is complete
- [C66xx_5] Sending a message #10 to CORE6
- The test is complete
- [C66xx_6] Sending a message #10 to CORE7
- The test is complete
- [C66xx_7] Sending a message #10 to CORE0
- The test is complete
- [C66xx_0] The test is complete
最后附上示例代码(模板生成的,仅删除部分注释,其他未做改动)
示例Notify的主要代码
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- #include <xdc/std.h>
- /* XDC.RUNTIME module Headers */
- #include <xdc/runtime/System.h>
- /* IPC module Headers */
- #include <ti/ipc/MultiProc.h>
- #include <ti/ipc/Notify.h>
- #include <ti/ipc/Ipc.h>
- /* BIOS6 module Headers */
- #include <ti/sysbios/knl/Semaphore.h>
- #include <ti/sysbios/knl/Task.h>
- #include <ti/sysbios/BIOS.h>
- /* To get globals from .cfg Header */
- #include <xdc/cfg/global.h>
- #define INTERRUPT_LINE 0
- /* Notify event number that the app uses */
- #define EVENTID 10
- /* Number of times to run the loop */
- #define NUMLOOPS 10
-
- UInt32 seq = 0;
- UInt16 recvProcId;
- UInt16 srcProc, dstProc;
-
- /*
- * ======== cbFxn ========
- * This function was registered with Notify. It is called when any event is
- * sent to this processor.
- */
- Void cbFxn(UInt16 procId, UInt16 lineId, UInt32 eventId, UArg arg,
- UInt32 payload)
- {
- /* The payload is a sequence number. */
- recvProcId = procId;
- seq = payload;
- Semaphore_post(semHandle);
- }
-
- /*
- * ======== tsk0_func ========
- * Sends an event to the next processor then pends on a semaphore.
- * The semaphore is posted by the callback function.
- */
- Void tsk0_func(UArg arg0, UArg arg1)
- {
- Int i = 1;
- Int status;
-
- if (MultiProc_self() == 0)
- {
- while (i <= NUMLOOPS)
- {
- /* Send an event to the next processor */
- status = Notify_sendEvent(dstProc, INTERRUPT_LINE, EVENTID, i,
- TRUE);
-
- /* Continue until remote side is up */
- if (status < 0)
- {
- continue;
- }
-
- System_printf("tsk1_func: Sent request #%d to %s\n", seq,
- MultiProc_getName(dstProc));
-
- /* Wait to be released by the cbFxn posting the semaphore */
- Semaphore_pend(semHandle, BIOS_WAIT_FOREVER);
-
- System_printf("tsk1_func: Received request #%d from %s\n", seq,
- MultiProc_getName(recvProcId));
-
- /* increment for next iteration */
- i++;
- }
- }
- else
- {
- while (seq < NUMLOOPS)
- {
- /* wait forever on a semaphore, semaphore is posted in callback */
- Semaphore_pend(semHandle, BIOS_WAIT_FOREVER);
-
- System_printf("tsk1_func: Received request #%d from %s\n", seq,
- MultiProc_getName(recvProcId));
-
- /* Send an event to the next processor */
- status = Notify_sendEvent(dstProc, INTERRUPT_LINE, EVENTID, seq,
- TRUE);
- if (status < 0)
- {
- System_abort("sendEvent failed\n");
- }
-
- System_printf("tsk1_func: Sent request #%d to %s\n", seq,
- MultiProc_getName(dstProc));
- }
- }
-
- System_printf("Test completed\n");
- BIOS_exit(0);
- }
-
- /*
- * ======== main ========
- * Synchronizes all processors (in Ipc_start), calls BIOS_start, and registers
- * for an incoming event
- */
- Int main(Int argc, Char* argv[])
- {
- Int status;
- UInt numProcs = MultiProc_getNumProcessors();
-
- /*
- * Determine which processors Notify will communicate with based on the
- * local MultiProc id. Also, create a processor-specific Task.
- */
- srcProc = ((MultiProc_self() - 1 + numProcs) % numProcs);
- dstProc = ((MultiProc_self() + 1) % numProcs);
-
- System_printf("main: MultiProc id = %d\n", MultiProc_self());
- System_printf("main: MultiProc name = %s\n",
- MultiProc_getName(MultiProc_self()));
-
- /*
- * Ipc_start() calls Ipc_attach() to synchronize all remote processors
- * because ‘Ipc.procSync‘ is set to ‘Ipc.ProcSync_ALL‘ in *.cfg
- */
- status = Ipc_start();
- if (status < 0)
- {
- System_abort("Ipc_start failed\n");
- }
-
- /*
- * Register call back with Notify. It will be called when the processor
- * with id = srcProc sends event number EVENTID to this processor.
- */
- status = Notify_registerEvent(srcProc, INTERRUPT_LINE, EVENTID,
- (Notify_FnNotifyCbck) cbFxn, NULL);
- if (status < 0)
- {
- System_abort("Notify_registerEvent failed\n");
- }
-
- BIOS_start();
-
- return (0);
- }
示例MessageQ的主要代码
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- #include <xdc/std.h>
- #include <string.h>
- /* XDC.RUNTIME module Headers */
- #include <xdc/runtime/System.h>
- #include <xdc/runtime/IHeap.h>
- /* IPC module Headers */
- #include <ti/ipc/Ipc.h>
- #include <ti/ipc/MessageQ.h>
- #include <ti/ipc/HeapBufMP.h>
- #include <ti/ipc/MultiProc.h>
- /* BIOS6 module Headers */
- #include <ti/sysbios/BIOS.h>
- #include <ti/sysbios/knl/Task.h>
- /* To get globals from .cfg Header */
- #include <xdc/cfg/global.h>
-
- #define HEAP_NAME "myHeapBuf"
- #define HEAPID 0
- #define NUMLOOPS 10
- Char localQueueName[10];
- Char nextQueueName[10];
- UInt16 nextProcId;
-
- /*
- * ======== tsk0_func ========
- * Allocates a message and ping-pongs the message around the processors.
- * A local message queue is created and a remote message queue is opened.
- * Messages are sent to the remote message queue and retrieved from the
- * local MessageQ.
- */
- Void tsk0_func(UArg arg0, UArg arg1)
- {
- MessageQ_Msg msg;
- MessageQ_Handle messageQ;
- MessageQ_QueueId remoteQueueId;
- Int status;
- UInt16 msgId = 0;
- HeapBufMP_Handle heapHandle;
- HeapBufMP_Params heapBufParams;
-
- if (MultiProc_self() == 0)
- {
- /*
- * Create the heap that will be used to allocate messages.
- */
- HeapBufMP_Params_init(&heapBufParams);
- heapBufParams.regionId = 0;
- heapBufParams.name = HEAP_NAME;
- heapBufParams.numBlocks = 1;
- heapBufParams.blockSize = sizeof(MessageQ_MsgHeader);
- heapHandle = HeapBufMP_create(&heapBufParams);
- if (heapHandle == NULL)
- {
- System_abort("HeapBufMP_create failed\n");
- }
- }
- else
- {
- /* Open the heap created by the other processor. Loop until opened. */
- do
- {
- status = HeapBufMP_open(HEAP_NAME, &heapHandle);
- /*
- * Sleep for 1 clock tick to avoid inundating remote processor
- * with interrupts if open failed
- */
- if (status < 0)
- {
- Task_sleep(1);
- }
- } while (status < 0);
- }
-
- /* Register this heap with MessageQ */
- MessageQ_registerHeap((IHeap_Handle) heapHandle, HEAPID);
-
- /* Create the local message queue */
- messageQ = MessageQ_create(localQueueName, NULL);
- if (messageQ == NULL)
- {
- System_abort("MessageQ_create failed\n");
- }
-
- /* Open the remote message queue. Spin until it is ready. */
- do
- {
- status = MessageQ_open(nextQueueName, &remoteQueueId);
- /*
- * Sleep for 1 clock tick to avoid inundating remote processor
- * with interrupts if open failed
- */
- if (status < 0)
- {
- Task_sleep(1);
- }
- } while (status < 0);
-
- if (MultiProc_self() == 0)
- {
- /* Allocate a message to be ping-ponged around the processors */
- msg = MessageQ_alloc(HEAPID, sizeof(MessageQ_MsgHeader));
- if (msg == NULL)
- {
- System_abort("MessageQ_alloc failed\n");
- }
-
- /*
- * Send the message to the next processor and wait for a message
- * from the previous processor.
- */
- System_printf("Start the main loop\n");
- while (msgId < NUMLOOPS)
- {
- /* Increment...the remote side will check this */
- msgId++;
- MessageQ_setMsgId(msg, msgId);
-
- System_printf("Sending a message #%d to %s\n", msgId,nextQueueName);
-
- /* send the message to the remote processor */
- status = MessageQ_put(remoteQueueId, msg);
- if (status < 0)
- {
- System_abort("MessageQ_put had a failure/error\n");
- }
-
- /* Get a message */
- status = MessageQ_get(messageQ, &msg, MessageQ_FOREVER);
- if (status < 0)
- {
- System_abort("This should not happen since timeout is forever\n");
- }
- }
- }
- else
- {
- /*
- * Wait for a message from the previous processor and
- * send it to the next processor
- */
- System_printf("Start the main loop\n");
- while (TRUE)
- {
- /* Get a message */
- status = MessageQ_get(messageQ, &msg, MessageQ_FOREVER);
- if (status < 0)
- {
- System_abort("This should not happen since timeout is forever\n");
- }
-
- System_printf("Sending a message #%d to %s\n",MessageQ_getMsgId(msg),
- nextQueueName);
-
- /* Get the message id */
- msgId = MessageQ_getMsgId(msg);
-
- /* send the message to the remote processor */
- status = MessageQ_put(remoteQueueId, msg);
- if (status < 0)
- {
- System_abort("MessageQ_put had a failure/error\n");
- }
-
- /* test done */
- if (msgId >= NUMLOOPS)
- {
- break;
- }
- }
- }
-
- System_printf("The test is complete\n");
- BIOS_exit(0);
- }
-
- /*
- * ======== main ========
- * Synchronizes all processors (in Ipc_start) and calls BIOS_start
- */
- Int main(Int argc, Char* argv[])
- {
- Int status;
-
- nextProcId = (MultiProc_self() + 1) % MultiProc_getNumProcessors();
-
- /* Generate queue names based on own proc ID and total number of procs */
- System_sprintf(localQueueName, "%s", MultiProc_getName(MultiProc_self()));
- System_sprintf(nextQueueName, "%s", MultiProc_getName(nextProcId));
-
- /*
- * Ipc_start() calls Ipc_attach() to synchronize all remote processors
- * because ‘Ipc.procSync‘ is set to ‘Ipc.ProcSync_ALL‘ in *.cfg
- */
- status = Ipc_start();
- if (status < 0)
- {
- System_abort("Ipc_start failed\n");
- }
-
- BIOS_start();
-
- return (0);
- }
本文原创,博文地址
http://blog.csdn.net/fengyhack/article/details/44034941