* msg_qnum The number of messages waiting to be read from the queue. * msg_qbytes The maximum number of bytes allowed in one message queue. On Linux, this value may be read and modified via /proc/sys/kernel/msg
程序先后执行了如下代码msgQId = msgQCreate (numMsg, sizeof (struct msg), MSG_Q_FIFO))msgQSend (ms
第一:msg基本简介 Linux系统中IPC通信有多种方式,msg是其中的一种通信方式,称为消息队列。Linux系统中可以通过ipcs -q来查看所有存在的消息队列。 消息队列与FIFO很类似,都是一个队列结构,并可以实现多进程往队列写入信息,以及多进程可以从队列里面读取信息。但是FIFO需要读写两个端口,事先要打开,这样才能正常传递消...
MSG_Q_FIFO0 #defineMSG_Q_OK 0 #defineMSG_Q_ERROR -1 #defineMSG_NO_DATA 0x4001 #define MSG_PTR_ 0x4004 #define MSGFULL 0x4002 #define MSG_TOOBIG 0x4003 typedef int STATUS typedef struct { max_msg_num;//最大消息数量
用户可以从消息队列中读取数据和添加消息,其中发送进程添加消息到队列的末尾,接收进程在队列的头部接收消息,消息一旦被接收,就会从队列中删除。和FIFO有点类似,但是它可以实现消息的随机查询,比FIFO具有更大的优势(比如按消息的类型字段取消息)。 2.消息队列的三个数据结构 ...
Note:Non-exception messages are received in first-in first-out (FIFO) order. If an exception message is received from a message queue for a procedure, the related exception may not be handled at the time the RCVMSG command is run. The RMV parameter can be used to specify whether the exc...
FIFO) VIA Bus Master PCI IDE Controller Standard Floppy Disk Controller Motherboard Resources PCI Bus VIA AC'97 Audio Controller (WDM) VIA Tech 3038 PCI to USB Universal Host Controller Primary IDE Controller (Dual FIFO) VIA Bus Master PCI IDE Controller Secondary IDE Controller (Dual FIFO) ...
In the screenshot you can see the last node [...]read_master:read_mstr_internal|scfifo:the_master_to_st_fifo|usedw[4..0] as a bar chart, this is a FIFO in the read_master of the altera_sgdma that overflows. The issue is in the read_master module, its ...
FIFO 顺序 * OS_OPT_POST 顺序* * ts 是消息存入的时间戳 * * perr 是指向变量的指针,该变量将包含返回错误代码。 ** _ERR_Q_MAX 如果 * OS_ERRMSG_POOL_EMPTY 如果没有 OS_MSG * OS_ERR_消息已成功* * 返回 无 * * 注意: 1) 此函数是uC/OS...
alt_tse_system_info tse_mac_device = { TSE_SYSTEM_INT_MEM_NO_SHARED_FIFO(TSE_MAC, 0, TX_MSGDMA, RX_MSGDMA, TSE_PHY_AUTO_ADDRESS, 0) }; Has anyone experience with this IP? Can anyone give a hint what I do wrong? Thank you!