fifo wireless

Learning the operating system, will be exposed to the cache scheduling algorithm, cache page scheduling algorithm: First allocate a certain amount of page space, the use of the page first to query whether the space has the cache of the page, if there is a direct take out, if not the first query, if the page space is not full, when the use of new pages, It frees up the old page space, caches the new page, and makes it easy to invoke the next time you use the same page. Cache scheduling Flowc

Old Rules: When the serial port receives data from the PC (100 bytes, once every ms), it will occasionally lose some data. A test record is as follows:For the first time, the total amount of data sent is more than 0.6 million bytes, and 27 are lost. For the second time, the total amount of data sent is more than 0.8 million bytes (based on the previous sending) 40 million data records are lost for the third time. The total data volume is more than 1.9 million bytes (based on the previous sending

Interprocess communication must be provided through the kernel channel, and there must be a way to identify a channel provided by the kernel in the process, which is identified by an open file descriptor. If several processes to communicate with each other do not inherit file descriptors from a common ancestor, how do they communicate? The kernel provides a channel that is not a problem, and the question is how do you identify this channel so that all processes can access it? The path names in t

Let's start by talking about the general purpose of interprocess communication (IPC), such as data transfer, shared data, notification events, resource sharing, and process control. But we know that for each process the process sees a piece of memory that belongs to it, and this resource is exclusive, so communication between processes can be cumbersome, and the principle is that a common resource can be seen between different processes. so the exchange of data must be through the kernel, in the

1. FIFO:FIFO is also a named pipe, can be used for any interprocess communication, and ordinary nameless pipe can only be used to have a common ancestor of the direct communication;The named pipe is also half-duplex, and the open pipeline should not be opened with read-write mode, this operation is undefined;2. FIFO creation:#include int mkfifo (constChar *= successfully returned 0, failed to return-1FIFO is a file type, the mode parameter is the same

Anonymous pipe pipes have been said before, the next is named pipe FIFO;We can use one of the following functions to create a named pipe whose prototype is as follows:#include #include int Mkfifo (const char *filename, mode_t mode);int Mknod (const char *filename, mode_t mode | S_ififo, (dev_t) 0);Both of these functions can create aFifo，Note is to create a file that is actually present in the file system,FileName specify filename, modemknod is the ol

Cache algorithm (page replacement algorithm)-fifo, LFU, LRU In the previous article through the Leetcode of a topic to understand the LRU algorithm specific design ideas, continue to explore the other two common cache algorithm: FIFO, LFU 1.FIFO algorithm FIFO (first-out). In fact, in the operating system design concep

For more information about how to analyze LIFO or FIFO problems in the WMS system, see. For more information about how to analyze LIFO or FIFO problems in the WMS system, see. The Code is as follows: --- A problem often encountered in Warehouse Management 1. Brief description of LIFO and FIFO --- FIFO: First in, Firs

1.Verilog Collation of the FIFO paper notes 2.FIFO, Verilog Using Verilog to realize two synchronous FIFO methods, it is very suitable for beginners to understand the process and method of timing control.Understand this thing, a lot of Verilog realize method and thought you will have a deep understanding.Accumulate slowly.16*16

Inter-process Communication-fifoAnother way to communicate between processes is FIFO. FIFO is another pipe: a well-known pipe. As you can see from the name, it's also a queue.FIFO must be created before using FIFO communication$ Mkfifo Myfifothen just use the Myfifo like a file. Fifo_w.c#include Fifo_r.c#include Testin the example above, one process continuously

Knowledge about serial ports Three independent serial ports, each of which can use DMA And interrupt operation. Each contains two 64-byte FIFO, one connection and one sending. The non-FIFO mode is equivalent to a register buffer mode in the FIFO mode. Each UART has seven statuses: overrun error, verification error, frame error, breakpoint, and receiving buffe

Pipelines can only be used for communication between relationships, whereas in a FIFO, a path is accessible so that communication is possible.FIFO communicates in the first-in, first-out principle, and the data that is written is first read from the pipeline.There are two system functions that create a named pipe: Mknod and Mkfifo. Two functions are defined in the header file Sys/stat.h, the function prototype is as follows: #include #include int Mkn