what interrupt would you hook from DOS to get the real-time clock
what interrupt would you hook from DOS to get the real-time clock ...
interrupt
Interrupts and exceptions
I've seen several question on here about exceptions, and some of them hint at interrupts as exceptions, but none make the connection clear. What is an interrupt? What is an exception? (please explain what exceptions are for each language you know, as there are some differences) When is an exception an interrupt and vice-versa? ...
Enabling floating point interrupts on Mac OS X Intel
On Linux, feenableexcept and fedisableexcept can be used to control the generation of SIGFPE interrupts on floating point exceptions. How can I do this on Mac OS X Intel? Inline assembly for enabling floating point interrupts is provided in http://developer.apple.com/documentation/Performance/Conceptual/Mac_OSX_Numerics/Mac_OSX_Numeric...
Using keyboard interrupt to display something different than what the user typed
In the C language, using keyboard interrupt, how can I display an alternate key from what the user typed? E.g., when I press 'Q' on the keyboard, then the screen should display 'A'. ...
What is the typical interrupt latency for WinCE 6.0 on an ARM target?
What is a typical interrupt latency for WinCE 6.0 on an ARM target? (Just looking for a ballpark value for performance estimation) ...
Can breakpoints be used in in ISRs?
Can breakpoints be used in interrupt service routines (ISRs)? ...
What is the difference between a static global and static volatile variable?
I have used a static global variable and a static voltalile variable in file scope, both are updated by an ISR and a main loop and main loop checks the value of the variable. here during optimization neither global vriable nor the volatile variable are optimized. So instead of using a volatile variable a global variable solves the probl...
How do you handle large data transfers on very memory constrained, embedded systems?
I have a microcontroller that must download a large file from a PC serial port (115200 baud) and write it to serial flash memory over SPI (~2 MHz). The flash writes must be in 256 byte blocks preceded by a write command and page address. The total RAM available on the system is 1 kB with an 80 byte stack size. This is currently working ...
How should I close a socket in a signal handler?
I'm writing a very simple server that loops forever until Ctrl-C is pressed. I'd like to have the signal handler for ctrl-c close the open sockets and shut down the server, but I don't know what the scope is for a signal handler, and I don't like the idea of declaring the socket(s) I would need to close to be global. Can someone offer s...
Return from interrupts in x86
I have loaded an idt table with 256 entries, all pointing to similar handlers: for exceptions 8 and 10-14, push the exception number (these exceptions push an error code automatically) for the others, push a "dummy" error code and the exception number; then jump to a common handler So when the common handler enters, the stack is prop...
How are interrupts handled by dual processor machines?
I have an idea of how interrupts are handled by a dual core CPU. I was wondering about how interrupt handling is implemented on a board with more than one physical processor. Is any of the interrupt responsibility determined by the physical board's configuration? Each processor must be able to handle some types of interrupts, like di...
Syntax for interruptible lock in C#
I suspect this is a very dumb question: what is the correct syntax for an interruptible lock statement in C#? E.g. get lock; if lock is interrupted before locked code finishes, return false out of the enclosing method. Probably totally the wrong terminology... Thanks. ...
Problems with IRQs when connecting two digium card in and asterisk box
I have two Digium Wildcard TDM800P with 8 FXO ports each. When I connect both at the same time IRQ misses start showing up making my computer unresponsive and unusable. One card works fine but I need all 16 FXO ports to work to receive calls from my Telco. Is there a way for the cards to communicate with each other so they don't genera...
Java equivelant of setInterval in javascript
Basically I want a function to be called every say, 10 milliseconds. How can I achieve that in Java? ...
Interrupt processing in Windows
I want to know which threads processes device interrupts. What happens when there is a interrupt when a user mode thread is running? Also do other user threads get a chance to run when the system is processing an interrupt? Kindly suggest me some reference material describing how interrupts are handled by windows. ...
Handling Interrupt in C++
Hi all: I am writing a framework for an embedded device which has the ability to run multiple applications. When switching between apps how can I ensure that the state of my current application is cleaned up correctly? For example, say I am running through an intensive loop in one application and a request is made to run a second app ...
Ruby, windows, active_record, and Control-C
What is active_record doing to the signal processes under windows (I don't see this with the same versions on the mac) that causes it to behave so strangely? For instance: require 'rubygems' trap("INT"){puts "interrupted"} puts __LINE__ sleep 5 require 'active_record' trap("INT"){puts "interrupted again"} puts __LINE__ sleep 5 When I...
Is there any way in Java to log *every* Thread interrupt?
I would like to somehow log every time Thread.interrupt() is called, logging which Thread issued the call (and its current stack) as well as identifying information about which Thread is being interrupted. Is there a way to do this? Searching for information, I saw someone reference the possibility of implementing a security manager. ...
How to interrupt a BlockingQueue which is blocking on take()?
I have a class that takes objects from a BlockingQueue and processes them by calling take() in a continuous loop. At some point I know that no more objects will be added to the queue. How do I interrupt the take() method so that it stops blocking? Here's the class that processes the objects: public class MyObjHandler implements Runna...
What's the difference between a Continuation (as in Smalltalk) and an interrupt (as in an Assembler)?
I'm struggling to understand the concept of Continuations (as used in Seaside with Smalltalk). A snippet from Wikipedia says: "... refer to first-class continuations, which are constructs that give a programming language the ability to save the execution state at any point and return to that point at a later point in the program..."...