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Topic: Interrupt

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  Interrupt - Wikipedia, the free encyclopedia
Software interrupts are usually implemented as instructions in the instruction set, which cause a context switch to the interrupt handler similarly to a hardware interrupt.
Interrupt in general sense means "breaking the flow of" and, as it is not known earlier, an asynchronous interrupt.
Interrupts may be implemented in hardware as a distinct system with control lines, or they may be integrated into the memory subsystem.
en.wikipedia.org /wiki/Interrupt   (752 words)

 Interrupt class Reference
We record whether interrupts are enabled or disabled, and any hardware interrupts that are scheduled to occur in the future.
Interrupt::ChangeLevel Change interrupts to be enabled or disabled, without advancing the simulated time (normally, enabling interrupts advances the time).
Interrupt::YieldOnReturn Called from within an interrupt handler, to cause a context switch (for example, on a time slice) in the interrupted thread, when the handler returns.
www.ida.liu.se /~TDDB72/material/begguide/htmlref/classInterrupt.html   (662 words)

 Making interrupt design firmware friendly
Interrupts, from the perspective of the firmware, are asynchronous signals.
The delay in handling an interrupt, called the interrupt latency, is generally measured from the occurrence of the interrupt until the firmware begins to handle the interrupt.
If the hardware designer is unsure of the need for an interrupt, he or she should work through the operation of the IC at that point to verify that firmware intervention is needed.
www.us.design-reuse.com /news/news4154.html   (2300 words)

 Thread (Java 2 Platform SE v1.4.2)
The interrupted status of the thread is cleared by this method.
In other words, if this method were to be called twice in succession, the second call would return false (unless the current thread were interrupted again, after the first call had cleared its interrupted status and before the second call had examined it).
The interrupted status of the thread is unaffected by this method.
java.sun.com /j2se/1.4.2/docs/api/java/lang/Thread.html   (3286 words)

 Technical Note TN1001: On Power Macintosh Interrupt Management
Secondary interrupt handlers are run before control is returned to task level code but can still be preempted by other primary interrupt handlers.
By using the secondary interrupt handler to complete non-device-related tasks belonging to the read transaction, the driver writer is not locking out other code and is behaving appropriately in a multitasking environment.
Interrupts are not available to applications, but there are ways for applications and interrupt handlers to exchange information.
developer.apple.com /technotes/tn/tn1001.html   (1376 words)

 Dr. Dobb's | Interrupt Management Under Linux | October 13, 2006
Interrupt handling is a fundamental part of the Linux kernel.
An interrupt request line is not truly disabled until the number of disable requests matches the number of enable requests.
When the host microcontroller responds to an interrupt request, control first goes to a bit of assembly language code that knows how to store register values and other information critical to restoring the machine state after the interrupt is serviced.
www.ddj.com /dept/linux/193301272   (1150 words)

 Linux.com - Interrupt Handlers
The second, called interrupts, is much harder to implement because it has to be dealt with when convenient for the hardware, not the CPU.
When the CPU receives an interrupt, it stops whatever it's doing (unless it's processing a more important interrupt, in which case it will deal with this one only when the more important one is done), saves certain parameters on the stack and calls the interrupt handler.
The solution to this problem is for the interrupt handler to do what needs to be done immediately, usually read something from the hardware or send something to the hardware, and then schedule the handling of the new information at a later time (this is called the "bottom half") and return.
www.linux.com /guides/lkmpg/x1206.shtml   (1104 words)

 The Linux "real time interrupt patch"
Interrupts are prioritized by enabling or disabling specific interrupts through the interrupt controllers.
The linux interrupt processing routines are modified to be re-entrant in order to allow higher priority interrupts to occur while low priority interrupt processing is in progress.
Interrupts could also be prioritized by enabling or disabling individual interrupt lines in the i8259 interrupt controller when changing the current interrupt level (rtirq_setlevel).
www.linuxdevices.com /articles/AT6105045931.html   (1983 words)

 Linux Device Drivers, 2nd Edition: Chapter 9: Interrupt Handling
Once interrupts are enabled, the parallel interface generates an interrupt whenever the electrical signal at pin 10 (the so-called ACK bit) changes from low to high.
Interrupt lines are a precious and often limited resource, particularly when there are only 15 or 16 of them.
The driver therefore disables the interrupt during the reception of the packet; instead, a poll-and-delay loop is used to bring in the data.
www.xml.com /ldd/chapter/book/ch09.html   (12271 words)

 ON INTERRUPT   (Site not responding. Last check: 2007-10-13)
When you have an interrupt routine and the interrupt occurs it will branch to the interrupt code and will execute the interrupt code.
When an interrupt is services no other interrupts can occur because the processor(not the compiler) will disable all interrupts by clearing the master interrupt enable bit.
When the interrupt is services the interrupt is also cleared so that it can occur again when the conditions are met that sets the interrupt.
avrhelp.mcselec.com /ON_INTERRUPT.html   (786 words)

 interrupt - a definition from Whatis.com
An interrupt is a signal from a device attached to a computer or from a program within the computer that causes the main program that operates the computer (the operating system) to stop and figure out what to do next.
The interrupt handler prioritizes the interrupts and saves them in a queue if more than one is waiting to be handled.
A hardware interrupt occurs, for example, when an I/O operation is completed such as reading some data into the computer from a tape drive.
whatis.techtarget.com /definition/0,,sid9_gci212374,00.html   (419 words)

 [No title]
When a hardware interrupt occurs the CPU stops executing the instructions that it was executing and jumps to a location in memory that either contains the interrupt handling code or an instruction branching to the interrupt handling code.
The interrupt pin that an ISA device uses is often set using jumpers on the hardware device and fixed in the device driver.
The interrupt pin that a device uses is fixed and is kept in a field in the PCI configuration header for this device.
www.tldp.org /LDP/tlk/dd/interrupts.html   (2180 words)

 Interfacing The PC : Using Interrupts
Most Ports/UARTs may interrupt the processor for a range of reasons, eg byte received, time-outs, FIFO buffer empty, overruns etc, thus the nature of the interrupt has to be determined.
Before we can return from the interrupt, we must tell the Programmable Interrupt Controller, that we are ending the interrupt by sending an EOI (End of Interrupt 0x10) to it.
The CPU only has one interrupt line, thus the second controller had to be connected to the first controller, in a master/slave configuration.
www.beyondlogic.org /interrupts/interupt.htm   (3111 words)

 Dr. Dobb's | Modeling Interrupt Vectors | September 7, 2006
When using interrupts, the application and the device do their own things until the device is ready to interact, at which point the device notifies the host processor by issuing an interrupt request.
Thereafter, when a device issues an interrupt request, the processor invokes the ISR whose address resides in the interrupt vector element corresponding to the requested interrupt type.
Since a handler can interrupt the application almost anywhere during execution, it must be more cautious than other functions about disturbing the current processor state, particularly the processor registers.
www.ddj.com /dept/opensource/192600718   (1500 words)

 Interrupt Management
Every time interrupts are restored (and the restored interrupt mask has interrupts enabled), the clock advances one tick.
Whenever the clock advances, the event queue is examined and any pending interrupt events are serviced by invoking the procedure associated with the timer event (e.g., the interrupt service routine).
All interrupt service routines are run with interrupts disabled, and the interrupt service routine may not re-enable them.
www.cs.duke.edu /~narten/110/nachos/main/node5.html   (479 words)

 Technical Note TN1104: Interrupt-Safe Routines   (Site not responding. Last check: 2007-10-13)
When you patch a routine which is interrupt safe, you should assume that your patch is running at interrupt time and avoid doing things that are illegal at interrupt time.
The interrupt mask is not a reliable way to detect whether you are at "interrupt time." See Determining the Execution Level for details.
Hardware interrupt level requires that all interrupts with lower interrupt priority be disabled for the duration of the hardware interrupt handler.
developer.apple.com /technotes/tn/tn1104.html   (6125 words)

 NachOS: interrupt.cc Source File
00006 // 00007 // In order to emulate the hardware, we need to keep track of all 00008 // interrupts the hardware devices would cause, and when they 00009 // are supposed to occur.
If the console or the network is 00242 // operating, there are *always* pending interrupts, so this code 00243 // is not reached.
No interrupts to do.\n"); 00246 printf("No threads ready or runnable, and no pending interrupts.\n"); 00247 printf("Assuming the program completed.\n"); 00248 Halt(); 00249 } 00250 00251 //---------------------------------------------------------------------- 00252 // Interrupt::Halt 00253 // Shut down Nachos cleanly, printing out performance statistics.
web.ics.purdue.edu /~cs354/Nachos/interrupt_8cc-source.html   (649 words)

 Linux Kernel 2.4 Internals: Process and Interrupt Management
acknowledging the interrupt, updating the stats etc.) and work which can be postponed until later, when interrupts are enabled (e.g.
Since the early days of Linux support (early 90s, this century), developers were faced with the classical problem of accessing shared data between different types of context (user process vs interrupt) and different instances of the same context from multiple cpus.
if you race against interrupt handlers is because if you take it and then an interrupt comes in on the same CPU, it will busy wait for the lock forever: the lock holder, having been interrupted, will not continue until the interrupt handler returns.
www.tldp.org /LDP/lki/lki-2.html   (6810 words)

 Ralf Brown's Files
The interrupt list is a comprehensive listing of interrupt calls, I/O ports, memory locations, far-call interfaces, and more for IBM PCs and compatible machines, both documented and undocumented.
A number of people have converted some or all of the interrupt list files into HTML format, for example Marc Perkel and DJ Delorie.
You may download AMISLIB version 0.92 (117k), or just the AMIS v3.5 specification to which the TSRs created with AMISLIB conform.
www.cs.cmu.edu /~ralf/files.html   (835 words)

 Ralf Brown's Interrupt List - HTML Version
HTML version of the famous Ralf Brown Interrupt List with over 9000 linked pages and 350 indexes making the process of searching much easier.
He is well-known in cyberspace for maintaining the Interrupt List.
Interrupt - Access the Interrupt List by Interrupt Number
www.ctyme.com /rbrown.htm   (234 words)

 Interrupt Services DOS, BIOS, EMS und Mouse
IBM PC Hardware Interrupt Table (in order of priority)
INT 2F,2 - Multiplex Interrupt - Cancel file
INT 2F,3 - Multiplex Interrupt - Cancel all files
www.htl-steyr.ac.at /~morg/pcinfo/hardware/interrupts/inte1at0.htm   (2010 words)

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