The FIFO method can result in higher income tax for a business to pay, because the gap between costs and profit is wider (than with LIFO
FIFO and LIFO accounting
FIFO and LIFO accounting are methods used in managing inventory and financial matters involving the amount of money a company has tied up within inventory of produced goods, raw materials, parts, components, or feed stocks. They are used to manage assumptions of cost flows related to inventory, stock repurchases (if purchased at different prices), and various other accounting purposes.
Full Answer
Can a process open a FIFO in nonblocking mode?
A process can open a FIFO in nonblocking mode. In this case, opening for read-only succeeds even if no one has opened on the write side yet and opening for write-only fails with ENXIO (no such device or address) unless the other end has already been opened.
How does the FIFO work?
It can be opened by multiple processes for reading or writing. When processes are exchanging data via the FIFO, the kernel passes all data internally without writing it to the filesystem.
Is it possible to open a FIFO with no readers available?
Under Linux, opening a FIFO for read and write will succeed both in blocking and nonblocking mode. POSIX leaves this behavior undefined. This can be used to open a FIFO for writing while there are no readers available.
What is a FIFO special file?
A FIFO special file (a named pipe) is similar to a pipe, except that it is accessed as part of the filesystem. It can be opened by multiple processes for reading or writing.
What is FIFO mode?
FIFO Mode. In FIFO mode, the transmit and receive data is stored in integrated FIFO register memory for later transmission or retrieval via the SPI interface. Direct real-time output of the RXDATA on a physical output pin may additionally be obtained by configuring a GPIO pin appropriately, but it is not required.
How does FIFO memory work?
FIFO means First-In First-Out. A FIFO is a structure used in hardware or software application when you need to buffer a data....Input as burst data;Output as continuous data.The FIFO is used to buffer the minimum number of burst data in order to guarantee continuous reading from FIFO without interruption.
What is FIFO interrupt?
FIFO Interrupt Trigger Levels: Receive Buffer. If you decrease this value, more interrupts are sent to the processor, slowing bytes into the UART. If you increase this value too high, characters may overrun the FIFO/buffer. Transmit Buffer. The Transmit Buffer slider supports various values.
What is FIFO in serial communication?
A FIFO (First In First Out) is a UART buffer that forces each byte of your serial communication to be passed on in the order received. For an 8250 or 16450 UART, for example, the FIFO has a size of only one byte.
What are the advantages of FIFO method?
Followings are the advantages of FIFO method.FIFO method is easy to understand and operate.FIFO method is useful where transactions are not voluminous and prices of materials are falling.FIFO method is suitable for bulky materials with high unit prices.FIFO method helps to avoid deterioration and obsolescence.More items...
Why it is known as FIFO?
The queue data structure follows the FIFO (First In First Out) principle, i.e. the element inserted at first in the list, is the first element to be removed from the list. The insertion of an element in a queue is called an enqueue operation and the deletion of an element is called a dequeue operation.
Can FIFO interrupt?
The FIFO structure can also be used to automate the reception or transmission of a series of CAN messages and to generate a single message interrupt when the whole CAN frame series is transmitted/received.
Why is FIFO large in 16550?
The 16550 FIFO More critically, with only a 1-byte buffer there is a genuine risk that a received byte will be overwritten if interrupt service delays occur. To overcome these shortcomings, the 16550 series UARTs incorporated a 16-byte FIFO buffer with a programmable interrupt trigger of 1, 4, 8, or 14 bytes.
What is UART handler?
The UART handler disables its own transmit empty interrupts when the UART's transmit circular buffer is empty. This prevents a continuous flow of interrupts. When the application wishes to send data, it adds the data to the UART FIFO and then re-enables transmit empty interrupts.
What is FIFO size?
The depth (size) of the FIFO should be in such a way that, the FIFO can store all the data which is not read by the slower module. FIFO will only work if the data comes in bursts; you can't have continuous data in and out. If there is a continuous flow of data, then the size of the FIFO required should be infinite.
What is stm32 FIFO?
To my understanding, FIFO (in hardware-context) is a buffer which will be managed according to first-in-first-out principle. You put sequentially some bits into it and then you can read them i.e. blockwise when the desired threshold is reached.
What are UART types?
There are two basic types of UARTs: dumb UARTS and FIFO UARTS. Dumb UARTs are the 8250, 16450, early 16550, and early 16650. They are obsolete but if you understand how they work it's easy to understand how the modern ones work with FIFO UARTS ( late 16550, 16550A, and higher numbers).
What is a FIFO?
Disk controllers can use the FIFO as a disk scheduling algorithm to determine the order in which to service disk I/O requests. Communication network bridges, switches and routers used in computer networks use FIFOs to hold data packets en route to their next destination.
What does FIFO mean in data?
FIFO is an abbreviation for first in, first out. It is a method for handling data structures where the first element is processed first and the newest element is processed last. Real life example: In this example, following things are to be considered: There is a ticket counter where people come, take tickets and go.
DESCRIPTION top
A FIFO special file (a named pipe) is similar to a pipe, except that it is accessed as part of the filesystem. It can be opened by multiple processes for reading or writing. When processes are exchanging data via the FIFO, the kernel passes all data internally without writing it to the filesystem.
NOTES top
For details of the semantics of I/O on FIFOs, see pipe (7) . When a process tries to write to a FIFO that is not opened for read on the other side, the process is sent a SIGPIPE signal. FIFO special files can be created by mkfifo (3), and are indicated by ls -l with the file type 'p'.
COLOPHON top
This page is part of release 5.13 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/ . Linux 2017-11-26 FIFO (7)
Can you open the write end of a FIFO?
That paragraph seems to claim that you can successfully open the write end of a fifo anytime, as observed in Q2 by the original author.
Can a process open a FIFO in nonblocking mode?
In "man 7 fifo" is said "A process can open a FIFO in nonblocking mode. In this case, opening for read-only will succeed even if no-one has opened on the write side yet, opening for write-only will fail with ENXIO (no such device or address) unless the other end has already been opened.". but the process A always can open successfully ...
Can a FIFO be read and write?
Under Linux, opening a FIFO for read and write will succeed both in blocking and nonblocking mode. POSIX leaves this behavior undefined. This can be used to open a FIFO for writing while there are no readers available. A process that uses both ends of the connection in order to communicate with itself should be very careful to avoid deadlocks.
