Programming :: How To Achieve Interrupt
Jul 30, 2011How to achieve interrupts
any sources available apart from kernel code which show the usage of code...
How to achieve interrupts
any sources available apart from kernel code which show the usage of code...
I'm trying to open ttySx from an interrupt.the kernel crashes. is it possible to open/write to serial port from interrupts ? I think it crushes because when I try to open the device there is a mutex lock which cause the kernel to crash , am I right
View 2 Replies View RelatedHow can I achieve file consistency while using mmap? I have a block of code that needs synchronized access across processes (not threads). Using threads, one can regulate access to the mmaped portion of the file by locking it using a mutex. How can I achieve the same using different processes, some of which run in different programs?
View 2 Replies View RelatedIs there anyway in Linux that can achieve atomic increment/decrement for an integer variable without being interrupted? It means that the thread should not chance for other thread to run until theincrement/decrement is completed.
View 11 Replies View RelatedI have written a Linux kernel module (in Linux 2.4, Red Hat 9) which does the followings: It takes srcIP, sourceport, destIP, destport and loadvalue as command line arguments. If configured load value is greater than 1, it creates different channels (i.e. No of UDP channels created equals to configured load value), assign different source port and destination port to different channels and send UDP datagram in different channels. Say for example the configured parameters are as follows srcIP=10.17.17.43 destIP= 10.17.17.44 sourceport=10000 destport= 20000 loadvalue=2.
Then it creates two UDP different channels and transmits UDP packets (in every 20 milliseconds) to destination IP address (i.e., 10.17.17.44) with source port 10000, destination port 20000 in one channel and source port 10002, destination port 20000 in another channel. When I configure to pass ?loadvalue=500? and run the module, I get the below kernel panic message in system log file (i.e., var/log/messages) 0>Kernel panic: Aiee, killing interrupt handler! In interrupt handler - not syncing. Running the same linux kernel module ,in 1000 loadvalue, I get this message, eth0: Out-of-sync dirty pointer, 49937 vs. 49954 in text console. I am unable to catch the root cause of these problems and how will I solve these?
What is the realmode interrupt return on the stack. Is it pop AX pop CS or vice versa?
View 4 Replies View RelatedI have written interrupt handlers for a keyboard as well as the serial port RS232.
I have seen the book written by O'Reilly w.r.t the device drivers.
I wanted to know *exactly* what parts of Linux kernel should i understand well for having a crystal clear view of writing any kind of device driver ?
how do I achieve the result but here is the story. I have a script which prompts for the IP Address and read that value and validate if reachable. If not then it should keep on prompting until the IP is reachable. I tried using until loop as well as while loop but dang..Here are the codes
#!/bin/bash
IP_Feed () {
echo -n "Give me IP : "
[code]....
I changed the complier PGI to Intel. But i had some error message p4_error: interrupt SIGSEGV: 11 This error message was occured using intel compiler I don't know what is the ploblem.
View 2 Replies View RelatedCtrl-c with middle mouse button (MMB) trigger in running bash script trigger.
The key combination Ctrl-C or "^C" with the keyboard triggered on a running bash script stands for "signal interrupt" (SIGINT) and terminates the process.
For my workflow in the test phase, how I could do that with the MMB-Buffer, followed by the modified script command:
Code: Select allscript runs
script runs
script runs
Signal interrupt and rerun with MMB trigger:
Code: Select all^C; ./script.sh
modified script runs
modified script runs
does not work and 2 hours meta-crawlers
I am doing some Linux kernel programming for my research project. I need to record the timestamp (by using cpuid and rdtsc) when an interrupt handler (top half) is first invoked. Due to the time critical nature of the problem itself, I have to do the timestamping inside the interrupt handler itself (the first operation when the handler is called). However, I understand that tasks that are not so time critical should be deferred to a tasklet function (bottom half) for processing because other interrupts are disabled in a (top-half) interrupt handler. I am currently out of idea on how I can pass the timestamp information that I have obtained in the interrupt handler to the corresponding tasklet function.
View 2 Replies View RelatedEver since Linux kernels beyond 2.6.24.3, I've been unable to boot my HP Netserver LH3. It gives a kernel panic with a variety of messages that always include
"common_interrupt+0x38/0x39"
I tried everything from updating the BIOS and firmware, to myriads of differing kernel configurations (at 4 hours per compile, imagine the agony).
I also tried booting with every combination of the kernel boot parameters acpi=off, noapic, nolapic, irqpoll, etc., that I could imagine. No dice. In final desperation, I began unplugging PCI cards one by one before finally disconnecting the SDLT drive from the Netraid SCSI. It seems that in later kernels or versions of udev, sharing the SCSI bus with the LH3 drives causes conflicts. I have an additional AHA SCSI card in the machine, so will try connecting the SDLT to that and see how it goes.
I need cause an interrupt on a serial port. If I put a single HIGH on the RX pin, will that cause one? I all ready use the 4 control lines for data.Hope I am making sense?
View 5 Replies View RelatedIs there a way to interrupt the boot sequence, or execute it line by line? Alternatively, after a command has executed and the scree fills up, is there any way to "page up" on the screen?
View 1 Replies View RelatedAssume: 1) Multi-cpu environment 2) Process that gets interrupted, is the same process that executes the interrupt handler, so I guess technically nothing gets interrupted except what the process was doing before, but it is still executing as it is executing the handler. 3) There is no top or bottom half, when an interrupt takes place the handler is invoked, executes, then return from interrupt, simple as that.
Why would sleeping the handler (puts in sleep queue, context switch to next runnable process) be a bad idea?
The following message: [ 2364.064174] hda-intel: spurious response 0x0:0x0, last cmd=0x524011 or one very similar. The "last cmd" element may vary, though not necessarily. I'm currently running Lucid - Kubuntu with 2.6.32-22-generic kernel. The CPU is an Intel(R) Core(TM)2 Duo CPU E4500 @ 2.20GHz, 1 Gb ram, and two hard drives an Hitachi SATA (600 GB) and a WD PATA (350 GB). I've found several threads regarding the error message and the sound system on intel based systems. I would like to know whether AMD systems face a similar issue.
View 5 Replies View RelatedProgram code as how to measure interrupt latency..
View 2 Replies View RelatedI'm trying to install Centos 5, but I keep getting this error. It will say that, then hdc: lost interrupt. Anyone know what this is?
View 6 Replies View RelatedWhat GNOME does with pendrives does surprise me. It not only umounts the partitions, but also shuts the device down and turns off the power light. How do I achieve the same effect with CLI? I've tried eject but it does not cut power.
View 10 Replies View RelatedI'm working on some code from my computer at home and would like to do CVS updates to a remote server. When I'm at work I don't need to type in a password, but at home each time I need to type in my password each time I do a CVS update. I've followed the instructions here on how to set up a passwordless public/private ssh key pair: [URL].. However, after that I still need to type in my ssh password each time I do CVS update (or anything CVS related) from my local computer.
View 1 Replies View RelatedI have a video I want to convert to another video format that's similar to another video. The video's properties and codecs as follows:
Code:
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Vid.mp4':
Duration: 00:02:35.80, start: 0.000000, bitrate: 1731 kb/s
Audio: adpcm_ima_wav, 22050 Hz, stereo, s16
Video: mjpeg, yuvj420p, 128x128 [PAR 1:1 DAR 1:1], 30 tbr, 30 tbn, 30 tbc
I have install fedora12 in a virtual machine (oracle VBox) in a windows vista host (I know aaarg) and i can't have a fullscreen mode for the fedora I don't know, if it is cause additional features are needed for fedora or is something from the VBox and some additional features of it are needed any special arrangment is needed into the operetional parameters of the VBox.
View 2 Replies View RelatedI have configured /etc/syslog.conf for writing user level log messages, and it is working fine.
The line which i entered is: user.* /home/shekhar/obj/myjob.log
But the log file keeps increasing. I would like to rotate the log file when it reaches 100Kb.
How do i do that in red hat linux ?
How to achieve this effect of mouse?which function or api?see the imag:http://linux.chinaunix.net/bbs/attac...Z2uSUDstxs.png
View 6 Replies View RelatedI have installed a Fedora Core 12 Linux system onto a RAID 1 file system. I now need a way of getting an notification if the disk fails. Is there an SNMP MIB that covers Intel RAID? I have done the searching but still the answer alludes me.
View 1 Replies View RelatedI have a box with Novell Suse linux installed. It asks for username and password I do not have and cannot figure out. I also have a SantaFe distro CD with which I would like to replace the Suse on the box. I cannot get the box to BIOS to change the boot order to boot from CD. I would like to break free of Windows, but can't seem to get there from here...
View 5 Replies View RelatedI have a computer that freezes for about 41 seconds frequently. There's no logs other than a rtkit complaining about a starving bird. Then I started running vmstat, below is when the glitch happens. Any ideas on what could be causing the very high "in: The number of interrupts per second, including the clock." all of a sudden?
Code: .....
I'm installing 11.4 as a guest under Citrix's XenServer. The only access to a guest's graphical desktop is via VNC.The problem is that I can't achieve runlevel 5 as X can't find any devices. With 11.3 I was able to run Sax2 and add a dummy screen device to Xorg.conf that it created.When Sax2 was removed from 11.4, what was the fall-back for configuring X?
View 5 Replies View Relatedcopy old backups from 600+ CD/DVD media to a hard disk. Machine: A desktop with 4 DVD drivers, mainboard has 4 SATA conectors and only one PATA conector. My questions are:
1. What tuning can I do to the kernel on a Ubuntu Lucid Desktop to achieve maximum IO to dd/cp/rsync/whatever those medias to hd?
2. What's the best scenario regarding HD/DVD drive connections to mainboard regarding IO/throughput?
The intention is to insert 4 medias at a time and copy them all in parallel to a local hard disk.
I need to do the following things and googling didn't help much:
1.mount a volume(or windows share, whatever) into a non empty folder
2.both the original content of the folder and the content of the newly mounted volume is accessible
3.updated and newly created files can be written to the mounted volume or the original folder determined by something like a switch at mount time
4.if files with same names exist both in the folder and on the volume, then which file to be presented to the OS is determined by their last modified date/time.
any one can give a walk-through on how to achieve this?