1、基于ucsO II系統(tǒng)及LWip協(xié)議棧建立多TCP線程服務(wù)器注意事項2014.09.12一、ucOS II 與多任務(wù)相關(guān)配置1、os_cfg.h中#define OS_MAX_EVENTS 20u #define OS_MAX_FLAGS 2u #define OS_MAX_MEM_PART 5u #define OS_MAX_QS 20u #define OS_MAX_TASKS 20u 二、Lwip協(xié)議棧與多TCP連接相關(guān)配置1、lwipopts.h中#define MEMP_NUM_TCP_PCB 10#define MEMP_NUM_TCP_PCB_LISTEN 6#define ME

2、MP_NUM_SYS_TIMEOUT 10#define PBUF_POOL_SIZE 10注意：MEMP_NUM_TCP_SEG 應(yīng)設(shè)置為至少與 TCP_SND_QUEUELEN一樣大2、sys_arch.h中#define MAX_QUEUES 10 /* the number of mailboxes */#define MAX_QUEUE_ENTRIES 20 /* the max size of each mailbox */#define LWIP_TASK_MAX(LWIP_TASK_END_PRIO - LWIP_TASK_START_PRIO + 1)-發(fā)現(xiàn)問題：LWIP 服

3、務(wù)器不能接收多于2個客戶端的TCP連接解決辦法：將下面 OS_MAX_QS 數(shù)量改大，為20，問題解決#define OS_MAX_QS 4u調(diào)試過程：1、 定義LWIP_DEBUG 允許打印調(diào)試信息在lwipopt.h中，加一句#define LWIP_DEBUG2、 打開TCP_DEBUG開關(guān)，在opt.h中，修改如下：#define TCP_DEBUG LWIP_DBG_ON3、 運(yùn)行程序，查看調(diào)試信息，如下：TCP connection request 45091 -> 8000.TCP connection established 45091 -> 8000.1 / 3t

4、cp_pcb_purgetcp_pcb_purge: data left on ->unacked4、解決過程：由上面調(diào)試信息發(fā)現(xiàn)新建立的連接被丟棄，錯誤發(fā)生在accept_function()中， /* We have to set the callback here even though * the new socket is unknown. conn->socket is marked as -1. */ newconn = netconn_alloc(conn->type, conn->callback); if (newconn = NULL) retur

5、n ERR_MEM; 其中，調(diào)用netconn_alloc( )時候，出錯，返回NULL，再細(xì)看netconn_alloc( )函數(shù)，其中如下程序出錯，返回了NULL if (conn->recvmbox = sys_mbox_new(size) = SYS_MBOX_NULL) sys_sem_free(conn->op_completed); memp_free(MEMP_NETCONN, conn);return NULL;再細(xì)看，sys_mbox_new()函數(shù)，其中如下程序出錯，pQDesc->pQ = OSQCreate( &(pQDesc->pvQ

6、Entries0), size ); LWIP_ASSERT( "OSQCreate ", pQDesc->pQ != NULL );if( pQDesc->pQ != NULL ) return pQDesc; 因此，將問題鎖定在OSQCreate()函數(shù)pq = OSQFreeList; /* Get a free queue control block */ if (pq != (OS_Q *)0) /* Were we able to get a queue control block ? */ OSQFreeList = OSQFreeList->

7、;OSQPtr; /* Yes, Adjust free list pointer to next free*/ OS_EXIT_CRITICAL(); pq->OSQStart = start; /* Initialize the queue */ pq->OSQEnd = &startsize; pq->OSQIn = start; pq->OSQOut = start; pq->OSQSize = size; pq->OSQEntries = 0u; pevent->OSEventType = OS_EVENT_TYPE_Q; peven

8、t->OSEventCnt = 0u; pevent->OSEventPtr = pq;#if OS_EVENT_NAME_EN > 0u pevent->OSEventName = (INT8U *)(void *)"?"#endif OS_EventWaitListInit(pevent); /* Initalize the wait list */ else pevent->OSEventPtr = (void *)OSEventFreeList; /* No, Return event control block on error */

9、 OSEventFreeList = pevent; OS_EXIT_CRITICAL(); pevent = (OS_EVENT *)0; 查看OSQFreeList定義，發(fā)現(xiàn)在ucos_ii.h中，有如下定義：#if (OS_Q_EN > 0u) && (OS_MAX_QS > 0u)OS_EXT OS_Q *OSQFreeList; /* Pointer to list of free QUEUE control blocks */OS_EXT OS_Q OSQTblOS_MAX_QS; /*Table of QUEUE control blocks */#endif而查看 OS