Programming :: Passing Data From Interrupt Handler Function To Tasklet Function?

May 18, 2010

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.

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Programming :: Locking Mutex In A Signal Handler Function?

Feb 15, 2010

locking mutex (phtread_t type) in a signal handler function (installed by function signal()) for Linux. It seems that if the mutex has been previously locked by another thread outside the signal handler function and then the signal handler function tries to lock it, the whole process hangs.

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Programming :: Passing Array To Thread Function?

Aug 12, 2010

I am trying to pass an array to thread program. Its printing the val[0] value but its not printing value at val[1]. Can somebody help me with this problem.

#include <unistd.h>
#include <stdlib.h>


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Programming :: Function Handler Is Called One Time Only Instead 2 Times If The 2 Timers Expires At A Time

Mar 2, 2011

I am using Debian linux. I have 100 timers running. If a timer expired which will generate a signal and it was mapped to a same function handler. All the timers are mapped to one function handler. The problem is if the timer expires one at a time, the function handler called at a time. But if the 2 timers expires at a time, the function handler is called one time only instead 2 times. Is it possible to invoke the function handler as many times based on timer expirary happens simultaneoulsy?

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Programming :: How Can A Friend Function Access A Public Function From A Base Class

Nov 16, 2010

#include <iostream>
using namespace std;


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Programming :: Get Data From Serial Port Function Read() Blocks When Data Not Available?

Jun 11, 2009

I am using read() in c++ to get data from a serial port. However, if no data is available on the serial port the function blocks until dta arrives.Example code:

char m_readBuffer[255] = {0};
char* p_curChar = m_readBuffer;


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Programming :: Panic - Killing Interrupt Handler - Not Syncing

May 10, 2010

I 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= destIP= 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., 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?

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Programming :: Bash Array Add Function Example Using Indirect Array Reference As Function Argument?

Jun 20, 2010

I looked on the net for such function or example and didin't find anything, thus after having made one i guess it would be legitimate to drop it to see what others thinks of it.

local arrayname=$1


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General :: Scripting - Try To Passing Arguments To For Cycle - Inside A Function

Apr 26, 2011

The code:


Problem: I need a method to maintain the $i variable. In fact, actually, this variable get lost when executed. I think that an escape can preserve this variable and permit its execution inside the function, but I've no idea about.

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Programming :: Declaring A Function In A Function - C Programming

May 24, 2010

I want to declare a function in a function, but had no success till now, see the error code below and visit the project at sourceforge


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OpenSUSE Hardware :: Multi-function Epson Stylus Sx218 - Can Not Run The Scanner Function ?

Mar 24, 2011

I bought a multifunction stylus sx218 Espon model and I can not run the scanner function. I did some research and found a few solutions and very functional. I hope someone solves the problem. My version of openSUSE 11.2.

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OpenSUSE :: Get Function Set_magic_quotes_runtime() To Function On The Newer Versions?

Mar 30, 2011

I'm currently using OpenSuse 11.1 web server. This is bad since 11.1 is no longer supported. the reason why I am using it is because Function set_magic_quotes_runtime() was no longer being used. (so I was told)

That being said, is there a way to get Function set_magic_quotes_runtime() to function on the newer versions of OpenSuSE?

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General :: Write Script To Use Function And Still Keep Function Active?

Feb 21, 2010

the function terminates if no key is pressed for 10 consecutive seconds. I tried using the -t option as suggested in some forums, but my version of showkey doesn't have the option of changing the timeout. The options I get are:

-h --helpdisplay this help text
-a --asciidisplay the decimal/octal/hex values of the keys
-s --scancodesdisplay only the raw scan-codes
-k --keycodesdisplay only the interpreted keycodes (default).

Is it possible to write a script to use this function and still keep the function active until an interrupt is recieved?

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General :: Blocking Or Sleeping An Interrupt Handler?

Dec 2, 2010

Assume: 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?

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Software :: In Platform \ Use Ioctl Function To Read/write Data To Hid Device?

Jun 24, 2011

Now i have a problem.I want to used a hid usb device under linux 2.6.11.But i can't know how to used ioctl function to send and receive data to a hid device

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Programming :: Passing Data Between Php And C

Aug 21, 2010

I'm trying to work out the best way to achieve the following.

1)php page that grabs data from a local database. (not a problem)

2)It then needs to send this data to a c program/service running on a remote server. (I probably need it to be able to handle 4+ million reocrds in an array)

3) The c service then needs to process the data and send it back to the initial php script that called it. i was hoping this could be in a an array like structure of some kind. 4)update the db with the results.

I was thinking of using gsoap to write a simple c soap service that php can communicate with. Would this be the right way of doing this or would something like sockets in php be a better way of sending this volume of data as an array or struct to linux c socket if thats even possible.

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Programming :: Calling An Asm Function From C?

Jun 4, 2010

I have a question about calling an asm function from C....It doesn't work unless I create an asm variable to hold the value of the function in....Why?Here's the code that doesn't work...

asmfile.s - version one Code: .section .data
mydata: .ascii "this is the message!
.equ mylen, . - mydata


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Programming :: Using Backtrace() Function In C?

Jul 23, 2010

I want to use backtrace() function to debug a crash issue. I tried this sample code to see how backtrace works. backtrace() function always returns 0 with the below code. Is there any kernel configuration that needs to be set for proper working of backtrace?

#include <execinfo.h>
#include <stdio.h>
#include <stdlib.h>
/* Obtain a backtrace and print it to stdout. */
print_trace (void)


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Programming :: How To Write / Use Function

May 30, 2010

Can you offer me the code about fmod() in C. I want to know how this function work, i am very interested in it because i have no idea to implement it, i want to know... how to write the function... not 'how to use the function' can anyone post the source codes of this function here?

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Programming :: Accessing C Function From C++

Jul 5, 2010

i have an open source application that was developed in C++ (it uses objects and namespaces all over the place). I also have another application that was developed in C. Now i am trying to insert the code made in C into C++ application, but when i do that , i get this error on compilation of the source code:

error: 'mpi_init_vars' was not declared in this scope the function mpi_init_vars() is not part of object oriented programming and it doesn't belong to any scope, it was compiled into an object file and i am linking it with all objects of C++ application.

How can invoke the C function from C++ object oriented code?

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Programming :: Bash Function Using If / Then And Else

May 2, 2011

I am trying to build a function inside a script.

#System commands and other configurable.
INT_NET= .....

I can find lots of tutorials in how to use if, then, else. However, how do I define a variable inside the function?
for c in $ISO
Also, am I using the 'test' command correctly( -/+ week as valid test)?

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Programming :: Calling C Function In Php?

Feb 7, 2011

I am doing a web site program and what I need is to call a C program in the PHP cloud.Do u think it would be possible? The web site would get the user input from PHP UI and pass to the C program , the C program would process the function with the user input and output the a PHP page.

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Programming :: C++/c Function Is Uable To Know Its Name?

Jan 4, 2011

I ask if a c++/c function is able to know its name from inside itself:


int funct1(int a,b)
printf("%s ",funct_name());
or with a trick.

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Programming :: Run 'time' On A Function?

May 30, 2010

diskfillerfunction () {


Test 15: fill up partition /usr/bin/time: cannot run diskfillerfunction: No such file or directory

I am obviously omitting (...) a lot of the code, but the relevant part is all there. How do I 'time' a function?

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Programming :: Run Function In Background?

Mar 26, 2010

I wrote a spinner in Perl and when I did a spinner in shell I could just run the subroutine in the background.


In Perl, how do you run a function in a background and get the PID for that? I know PID in Perl is $$

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Programming :: Regarding Sleep() Function In C?

Mar 25, 2011

I know what is the functionality of the sleep() method.

for(i = 0; i < length; i++){
", message[i]);

Result :every print of the message will be takes 1000sec of gap but i want to know why wee need to use the Sleep function. where exactly it is useful

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Programming :: Return Value From A Function?

Nov 15, 2010

On this link [URL]4 a return type is defined

return ((unsigned int)(unsigned long)base & TBASE_DEFERRABLE_FLAG);
What is the above function returning.I am not clear with definition of what is being returned in the above code.

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Programming :: Use Function C In Java?

Apr 8, 2010

i want to compile function c in java and compile library is success.. when i call the library in java and error is :

Exception in thread "main" java.lang.UnsatisfiedLinkError: no in java.library.path
at java.lang.ClassLoader.loadLibrary(
at java.lang.Runtime.loadLibrary0(
at java.lang.System.loadLibrary(


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Programming :: Passing Data To A New Thread?

Feb 11, 2011

I have to launch a new thread from my existing main program and pass data to it.
For now the data is simply a string value.

How I go about passing data to a new thread while it is running.

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Programming :: Use Pipe In Excel Function?

Apr 13, 2010

In shell, I execute "./ffmpeg -f h264 - | xxx"

Now I hope use execl function to execute above operations,

I call execl("/bin/sh", "sh", "-c", "./ffmpeg -f h264 - | xxx");

but ffmpeg doesn't work, it seems that "|" pipe don't work.

how could I solve this?

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