What is Mailbox?

What is Mailbox? Write a note on Mailbox.
by

1 Answer

Answer :

Mailbox is used for inter-process communication for sending small messages between tasks or between ISR and task. The Mailbox is used in some Real Time Operating system (RTOS). If the task or thread want to send a message to another task or thread it creates the mailbox for sending the message. The message is sent by which task or thread and which created the mailbox is called mailbox server. And the message received by which task or thread is called mailbox client. Mailbox message is a kernel service.

by
edited
by
Mail box only are the inter process ....why

Related questions

Explain Inter-process Communication (IPC) using mailbox/queue.

Description : Explain Inter-process Communication (IPC) using mailbox/queue.

Last Answer : Inter-process communication using mailbox: Mailbox is the Interprocess communication mechanism. A process puts a data message for another process in the mailbox. Mailbox is also called as message exchange. ... a message. In mailbox IPC the sender need not to know the name of the receiver.

Do you need a key to open your mailbox?

Description : Do you need a key to open your mailbox?

Last Answer : No, we live in a single family home.

How does one make a piece of writing "read like fiction," especially if it's a true story, say, of a kid getting stuck in a mailbox?

Description : How does one make a piece of writing "read like fiction," especially if it's a true story, say, of a kid getting stuck in a mailbox?

Last Answer : They want a story, not a report. Think sitting around the campfire telling a story about the time your horse threw you,versus the list of facts you related to your doctor afterwards. The story will ... of that. Your story is more interesting, even if it incorporates the dry report to the doctor.

Anyone else have roaches in their mailbox every spring?

Description : Anyone else have roaches in their mailbox every spring?

Last Answer : That’s strange. They usually follow food.

What's in your mailbox?

Description : What's in your mailbox?

Last Answer : Unread emails drive me nuts too. I clean them out at least once a day.

If an automated-system keeps telling me I can't leave a voice-message because the mailbox is full, could I be blocked?

Description : If an automated-system keeps telling me I can't leave a voice-message because the mailbox is full, could I be blocked?

Last Answer : answer:Seriously? Did you need 35 subject topics assigned? Most of which are identical!! It is unlikely you personally are blocked. Mailbox sizes are set to be pretty small - if this is a business, ... was on vacation - person died - person never deletes messages, just saves them in his/her box

My mailbox is gone. Will I still get mail delivered to me while I am waiting for it to get replaced?

Description : My mailbox is gone. Will I still get mail delivered to me while I am waiting for it to get replaced?

Last Answer : The post office requires a “Box or receptacle” for mail. Read the LAST LINE. Contact the post office to hold your mail until a replacement is put in by your neighbor or their insurance company.

What is the best way to deal with mailbox bashers?

Description : What is the best way to deal with mailbox bashers?

Last Answer : Build your mailbox out of concrete.

When I go to check my AOL mail, it says "Mailbox not available due to temporary maintenance." Is this something others have experienced?

Description : When I go to check my AOL mail, it says "Mailbox not available due to temporary maintenance." Is this something others have experienced?

Last Answer : AOL took the mail server offline for site maintenance. It’s nothing new. All websites do this every once and awhile. To go a little off topic, Fluther went offline for site maintenance last night for a little bit.

How do I get a "Return to Sender" piece of mail back to the mailman if I don't have a mailbox?

Description : How do I get a "Return to Sender" piece of mail back to the mailman if I don't have a mailbox?

Last Answer : That or your post office.

What are those green mailbox things that aren't really mailboxes and don't even open?

Description : What are those green mailbox things that aren't really mailboxes and don't even open?

Last Answer : They’re generally used by postal workers to store mail they have picked up along their route for pickup by a truck later. That way the postal worker doesn’t have to lug all that extra mail with him/her all day.

i have bugs in my mailbox, i have a clematis vine growing up and around the mailbox..help?

Description : i have bugs in my mailbox, i have a clematis vine growing up and around the mailbox..help?

Last Answer : You cold spray your mailbox with bug-be gone......and mix 1 teasp non-alcohol liquid soap w 1 qt water and spray your plants..............spray again after a rain.

An invitation to the event has arrived in the mailbox.

Description : I received an invitation to a free trip, I will get an alarm clock and if we go from my husband as a couple, we will get knives for 1200 for free. Somehow I don't think so. Are there any hidden ... , and I want a clock radio. But something tells me ATTENTION !!! What do you think? Thank you Alena

Last Answer : Don't be afraid of hidden fees - but it will be a "classic" - sale of some very important and absolutely indispensable goods. If you dare not succumb to pressure marketing, go - and maybe you'll have a ... the organizer has a duty to do so, but often forgets - so you will help him fulfill his duty.

my metal mailbox has many layers of paint; how to clean

Description : my metal mailbox has many layers of paint; how to clean

Last Answer : Need Answer

what are the specifications for rural mailbox settings ?

Description : what are the specifications for rural mailbox settings ?

Last Answer : Take a look at this USPS webpage which has information on mailbox restrictions: http://pe.usps.com/text/dmm300/508.htm

Mailbox Post?

Description : Mailbox Post?

Last Answer : form_title= Mailbox Post form_header= Personalize getting the mail with a unique mailbox. What type of mailbox do you want? *= _ [50] Do you want to replace an existing mailbox?*= () Yes () No What size do you want the mailbox?*= _ [50]

What are the state mailbox regulations for Texas?

Description : What are the state mailbox regulations for Texas?

Last Answer : The mailbox regulations for Texas are the same as in most states. You must have a mailbox pertaining to your address and it's use must coordinate with the post office's terms of use.

Where can I find mailbox regulations?

Description : Where can I find mailbox regulations?

Last Answer : I hear that ups deals with mailbox regulations. There is store in my area. It could contain information of that nature within the store. That is what I think of for an action to take.

What are the mailbox regulations on package size?

Description : What are the mailbox regulations on package size?

Last Answer : Typically, so long as your item is packaged appropriately, and it carries the correct amount of postage stamps, it should be fine as long as it fits in the mail slot. To be on the safe side ... the local post office to mail it. You can guarantee safer shipping by mailing directly from the office.

Is Office 365 Email Secure to Use And I want to know what are method to backup my Office 365 Mailbox?

Description : Is Office 365 Email Secure to Use And I want to know what are method to backup my Office 365 Mailbox?

Last Answer : Microsoft launch MS Office 365 in subscription base model on 2001 in its most popular office suite series. After launching it become most popular subscription base product in all over the world. It ... will get life time subscription and all the application which can expect from any office version l

Why customized mailer boxes are the best choice for packaging What are the benefits of customized mailbox boxes, and where can I get them?

Description : Why customized mailer boxes are the best choice for packaging What are the benefits of customized mailbox boxes, and where can I get them?

Last Answer : Mailer box is widely used to send goods both locally and internationally. They are very popular because of their strength. The sturdy cardboard stock that is used to make them is the secret of ... properly. Generally, they have a rectangular shape, but they can be customized into any desired shape.

Why are customized mailer boxes the best choice for delivering What are the benefits of customized mailbox boxes, and where can I get them?

Description : Why are customized mailer boxes the best choice for delivering What are the benefits of customized mailbox boxes, and where can I get them?

Last Answer : As the world is a global village, so people all around the world are linked with each other one way or the other. They need packages by which they can interact with each other and send ... use these for shipping services, and they come with exclusive section lines because of which the items insid

how do you use letters in a mailbox in a sentence using personification?

Description : how do you use letters in a mailbox in a sentence using personification?

Last Answer : The letters were jumping up and down to be read.

Consider different activities related to email: m1: Send an email from a mail client to a mail server m2: Download an email from mailbox server to a mail client m3: Checking email in a web browser Which is the application level protocol used in each activity? a. m1: HTTP m2: SMTP m3: POP b. m1: SMTP m2: FTP m3: HTTP c. m1: SMTP m2: POP m3: HTTP d. m1: POP m2: SMTP m3: IMAP

Description : Consider different activities related to email: m1: Send an email from a mail client to a mail server m2: Download an email from mailbox server to a mail client m3: Checking email in a web browser Which is the application ... FTP m3: HTTP c. m1: SMTP m2: POP m3: HTTP d. m1: POP m2: SMTP m3: IMAP

Last Answer : c. m1: SMTP m2: POP m3: HTTP

Storage Area for E-mail messages are called: a) Directory b) Mailbox c) A folder d) None of These

Description : Storage Area for E-mail messages are called: a) Directory b) Mailbox c) A folder d) None of These

Last Answer : b) Mailbox

Normally, the FPGA resources are used less than 70% because:

Description : Normally, the FPGA resources are used less than 70% because:  a. Routing becomes excessively complicated b. Power issues c. Clock frequency d. Simulation time increases

Last Answer : Normally, the FPGA resources are used less than 70% because: Routing becomes excessively complicated

List and describe three general approaches to improve designer productivity.

Description : List and describe three general approaches to improve designer productivity.

Last Answer : Automation: The task of using a computer program to replace manual design effort. The program replaces manual design effort. Synthesis. Reuse: The ... correctness/completeness of each design step. Hardware/software co-simulation.

Explain placement, routing, and sizing.

Description : Explain placement, routing, and sizing.

Last Answer : Placement: The task of placing and orienting every transistor somewhere on IC. Routing: The task of running wires between the transistors without inserting other wires or transistors. ... wires and transistor provide better performance but consume more power and require more silicon area.

Explain different models that are used to describe embedded system.

Last Answer : Common computation models: Sequential program model Statements, rules for composing statements, semantics for executing them Communicating process model ... Object-oriented model For breaking complex software into simpler, well-defined pieces

Sketch internal design of 4x3 ROM.

Description : Sketch internal design of 4x3 ROM.

Last Answer : The internal design of 4x3 ROM

Explain the advantages and disadvantages of using memory I/O and standard I/O.

Description : Explain the advantages and disadvantages of using memory I/O and standard I/O.

Last Answer : Memory mapped I/O and standard I/O are the two methods for communicating microprocessor with peripherals. Processor talks to both memory and peripheral using the same bus.Two ways to talk to a peripheral. ... of standard I/O is no loss of memory addresses to the use as I/O addresses.

Explain parallel and wireless protocols.

Description : Explain parallel and wireless protocols.

Last Answer : Parallel protocols: PCI bus (Peripheral Components Interconnect): PCI stands for Peripheral Components Interconnect. PCI bus is used as a communication line to transmit signals and data ... provide the basis for wireless network products using the Wi-Fi brand.

Explain memory hierarchy.

Description : Explain memory hierarchy.

Last Answer : Memory hierarchy: Main memory is large, inexpensive, slow memory stores entire program and data. Cache memory is small, expensive, fast memory stores copy of likely accessed parts of large ... In memory hierarchy the smaller memory is faster and larger memory storage is slower.

Explain memory write ability and storage permanence with suitable diagram.

Description : Explain memory write ability and storage permanence with suitable diagram.

Last Answer : Write ability and storage permanence of memories: Write ability is the manner and speed at which memory can be written. Storage permanence is the ability of memory to hold stored bits ... Holds bits after power is no longer supplied. High end and middle range of storage permanence.

Describe different RT level computational and sequential components used to design single function processors.

Description : Describe different RT level computational and sequential components used to design single function processors.

Last Answer : RT-level combinational components:- To reduce the complexity in digital logic, combinational components are used, which are more powerful than logic gates.  Such combinational ... during a clock edge. An asynchronous inputs value effects the circuit independent of the clock.

Build using minimum number of CMOS gates.

Description : Build using minimum number of CMOS gates. Three input NAND gate. Two input NOR gate Three input NOR gate Two input AND gate Two input OR gate

Last Answer : Three input NAND gate. Two input NOR gate Three input NOR gate Two input AND gate Two input OR gate

Explain the various steps involved in designing a custom single-purpose processor.

Description : Explain the various steps involved in designing a custom single-purpose processor.

Last Answer : A single purpose processor is a digital circuit designed to execute exactly one program. It is also known as co-processor, accelerator or peripheral. It contains only ... for small quantities. Performance may not match general-purpose processors for same applications.

If Moor's law continues to hold, predict the approximation number of transistor per leading edge IC in the year.

Description : If Moor's law continues to hold, predict the approximation number of transistor per leading edge IC in the year. 1.2030 2.2050

Last Answer : If Moor's law continues to hold, predict the approximation number of transistor per leading edge IC in the year.1.20302.2050

Compare the annual growth rate of 1.IC capacity and 2.Designer productivity.

Description : Compare the annual growth rate of  1.IC capacity 2.Designer productivity.

Last Answer : Compare the annual growth rate of 1.IC capacity2.Designer productivity.

Explain arbitration. What is priority arbitrator?

Description : Explain arbitration. What is priority arbitrator?

Last Answer : Arbitration: IF multiple peripherals are connected to microprocessor or DMA controller or any resource and they request services simultaneously so which peripheral will get serviced first this is ... Peripherals make requests to arbiter and arbiter makes requests to the resource.

Explain FSM and concurrent process with example.

Description : Explain FSM and concurrent process with example.

Last Answer : Finite State Machine (FSM): Finite state machine is a machine which have a transition from state to state. The system have some number of states and at a time the system can ... Y seconds. In sequential execution, the processor executes single task which causes poor processor utilization.

Compose 1k x 8 ROMS into 8k x 8 ROM.

Description : Compose 1k x 8 ROMS into 8k x 8 ROM.

Last Answer : 1k x 8 ROMS into 8k x 8 ROM:

What is design technology? Explain top down design process.

Description : What is design technology? Explain top down design process.

Last Answer : Design technology: Design technology is the manner in which we convert our concept desired system into an implementation. The three main design technologies are 1. Compilation/Synthesis ... general purpose processors and A Gate-level Netlist for special-purpose processors.

Explain data transfer mechanism in I2C protocol.

Description : Explain data transfer mechanism in I2C protocol. Compare it with CAN and USB protocol based on bit rate and area of applications.

Last Answer : I2C (Inter-Integrated Circuit): I2C stands for Inter-Integrated Circuit. I2C is a serial protocol. It was developed by Philips Semiconductor. I2C bus have two communication lines. One is serial data ( ... Mbps this is used for lower speed devices. Using USB we can connect upto 127 devices.

the volatile keyword

Last Answer : The volatile keyword is a part of C standard, and this warns the compiler that ISR might change the value of a variable so that the compiler will not optimize the code in a way that will ... the keyword is not supported, you can still get the similar result by turning off the compiler optimizations.

stepper motor controller

Description : explain how a stepper motor is controlled using driver. give relevant hardware and software details.

Last Answer : A stepper motor is an electric motor that rotates fix number of degrees whenever we apply a step signal. the stepper motor can rotate 1.8-degree full step or ... driver 2. controlling a stepper motor directly Application of stepper motor: disk driversprintersphotocopyfax machinerobotscamcorder

Explain Keypad controller.

Description : Explain Keypad controller.

Last Answer : Keypad Controller: It's a device which interfaces between the computer and keyboard. That is a input device and used for transfer the data to connected device.

Liquid Crystal Display (LCD) in embedded system

Last Answer : Liquid Crystal Display:-An LCD is a low-cost, low power device capable of displaying text and images. LCD's are extremely common in embedded systems since such system often does not have video monitors ... toggles the enables bit and acts as a delay so that the command can be processed and executed.

Explain how UART is used for communication highlighting the advantages of UART.

Last Answer : UART takes parallel data and transmits serially and UART receives serial data and converts to parallel.A simple UART may possess1.Some configuration registers and2.Two independently operating processors, one ... must write data to the transmit register and/or read data from the received register.

Short notes on timers and counters.

Last Answer : Timers:-A timer is a peripheral device that can measure time intervals. Timers can be used to1. General events at the specific time or to determine the duration of two external events.eg. Keeping a ... the number of times the car wheel rotates in one second, in order to determine cars speed.