I'm making a programm under OpenSuse 11.1I'm using SDL and ofcourse SDL_TTF.when i render with the SDL's TTF function under main(), i have no problems, but when i render under thread i have segmentation fault.There is not exist any typing or any competition (i'm using semaphores) but even if i try to render on a local SDL_Surface i'm having the Segmentation fault...
View 2 Replies
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.
Code:
#include <unistd.h>
#include <stdlib.h>
[code]....
I'm trying to debug a gtk app on ubuntu that crashes from time to time when I open a dialog. Lately I have found a sequence of actions that always reproduces the bug. And I always get this error: Assertion 'pthread_setspecific(t->key, userdata) == 0' failed at pulsecore/thread-posic.c:200, function pa_tls_set(). Aborting.
So my app seems to crash because an error in pulseaudio, which is strange. I made some google search and apparently, this problem exists with other apps. Then, following a suggestion in a bug report, I opened sound-preferences and disabled windows and buttons sounds. And surprise? No more crash. I know that gtk handles events from windows and buttons and so does pulseaudio. So, could it possibly be a bug in pulseaudio instead of in my app? Does anyone have an idea of what's going on here?
I am going to use "pthread_setaffinity_np" to bind a thread to a specific core. My application has two threads. I have used mutex to assign a specific id to each thread and then bind that thread to a core different from another core. but it seems that the os assigns both thread to one core.What should I do to bind each thread to a specific core?
View 4 Replies View RelatedQuote:
logcountfunction()
{
awk ' {
# when executing the script pass the logfile as parameter on the command prompt with the name of the file
#export file_name= "&1"
[Code]....
my problem is that when i execute this script only the first two functions are being called.once the DBcounttry_finalnofunc() is done ,the script exits.The rest of the functions are not being called.
Is it possible to define functions within other functions in C++? I know it is the case in other languages.
View 2 Replies View RelatedI have the plugin installed ok and have pasted in a C source file that I know works and am getting the following errors, I think because the linker options need to be set in some way. I cannot copy the errors but they all complain of implicit declaration of functions like this: -
warning: implicit declaration of function strlen
But I have the headers included, is this a linker problem? Here is the code -
#include <stdio.h>
#include <math.h>
int main(){
[code]...
Code:
#include <iostream>
using namespace std;
[code]...
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 RelatedA simple TCP based chat server could allow users to use any TCP client (telnet, for example) to communicate with each other. For this question you should consider a single process, single thread server that can support exactly 2 clients at once, the server simply forwards whatever is sent from one client to the other (in both directions). Your server must not insist on any specific ordering of messages as soon as something is sent from one client it is immediately forwarded to the other client. As soon as either client terminates the connection the server can exit
View 4 Replies View RelatedI need help as I am not proficient with Linux C++ Programming. There are two parts which I need to do in the coding provided below.
1. Produce the program so it can output the word "Hey there!" and wait two minute and print the word "See you later!".
2. Produce the program that will output the text "Cool" every 20 seconds by setting a periodic task.
Quote:
#include <linux/kernel.h>
#include <linux/module.h>
MODULE_LICENSE("GPL");
int init_module(void)
{
printk("Hey there!
[Code]...
None of my daemon scripts work now, and the startup process displayed errors. Should I reinstall the OS and start from scratch, or is there a way to recover these files? Is there a way to rebuild the files I deleted?
View 2 Replies View RelatedWhat is the quickest way to get the thread id(tid) of the current thread in linux? Specifically I use fedora 13. ...and I am talking about inside a C++ program.
View 2 Replies View RelatedIs there a library/system call that will return to me what CPU core a thread of execution is running on? I've looked for a bit on the net already and also in /usr/include and couldn't find one.
getcpu() and sched_getcpu() are two that I found, but when I include the appropriate header files (linux/getcpu.h, and sys/sched.h respectively), gcc says getcpu.h doesn't exist and the linker complains it cannot find the implementation in sched.h.
I'm sure I'm doing something really stupid or overthinking...
What I am doing is running an OpenMP application and specifying a list of cpu cores to run on with GOMP_CPU_AFFINITY. I want to make sure that each core is getting the same number of threads.
**UPDATE**
It seems that this code works, but only with glibc >= 2.6, and my machine has 2.5:
Code:
#define _GNU_SOURCE
#include <stdio.h>
#include <utmpx.h>
int main( void )
[Code].....
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
[Code]...
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.
#!/bin/bash
addelementtoarray()
{
local arrayname=$1
[code]....
I'm running Debian Lenny 5.04, I switched from Ubuntu 'cause it was dissapointing me, there are lots of functions and gadgets but they just don't work and I can see it's fun thing to spend all your time fixing your computer IF you have no responsibilities at all.
For me on the other hand, I just want a system that works, doesn't look ancient and does not have it's head up it's ass. That used to be Debian, since installing Lenny however I noticed a couple of things that seem to have changed in the GUI. For instance, is there ANY STRAIGHTFORWARD way to install the REGULAR firefox with a REGULAR adobe flash player? And by straightforward I mean, using the systems strongpoint and installing it via a .deb-package.
This is really starting to piss me off, everytime I try following some idiot's tutorial on how to accomplish this and everytime it makes such a goddamn mess I can't seem to get it back to where I started and the system becomes really ubuntu-like ( instable). I just want a Firefox with working flash, that shouldn't be a problem anno 2010 right?
I have a program which is uses sigaction to register for a SIGIO signal (for incoming data on a fd) with an appropriate event handler. I also create a new detached thread 'B' that does some work with the received data. Normally the thread B runs properly. But when my event handler is called (because a there is new incoming data), after the event is handled, the thread B is not called immediately. There is a noticeable delay of the order of many seconds before it is scheduled again .During this delay, my program is doing nothing.
What am i doing wrong? Is there someway i can run thread B as soon as the event is handled (and assuming no other work is to be carried out)?
i created one thread in main(). I have while in thread function.
I want close the thread in main after some time. How can i close it.
Kernel: 2.6.24.2
System: Embedded System
I have a process and two threads running in it. Thread1 is my GUI-Thread (using FLTK) and Thread2 is running at the first 10 sec. after start.Now, I would like to make Thread2 "nicer" to Thread1, because otherwise GUI stucks sometimes. But I didn't find a solution.Is it possible to define the "niceness" of threads inside a process (to each other)? And if so, how do I have to do this?
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.
When I set the stack base address of the child thread using the POSIX library function "pthread_attr_setstackaddr()", I am unable to access the memory contents of its parent. The data-structures that are created on the HEAP of its parent using malloc() are either getting destroyed or unaccessible when moving to the context of the child thread. These data-structures are being passed as an argument to the child thread.Even if I make these variables global then also it is not working.pthread_attr_setstacksize(tattr, ...);stackbase = (void *) malloc(...);pthread_attr_setstackaddr(tattr, stackbase);But when I create the child thread without setting its stack base address using that pthread_attr_setstackaddr(), then it is able to access the parent's memory contents.
View 1 Replies View Relatedcould you please explain few questions about systemtap.
1st
===
seems gettimeofday_s() always returns 0 Code: stap -ve 'probe timer.s(4){ printf("%d ",
[code]....
This is about the 3rd or 4th year that I have tried to fill in my Federal tax return on the IRS website using Ubuntu/Firefox/pdf program(s). Still to this day the PDF functions found available (or should I say unavailable) (whether using either EVINCE or ACROREAD) for this O/S will not properly function in allowing you to CONSISTENTLY complete a PDF IRS form on their website, print and then save that completed IRS form to the hard drive of your computer. This is sort of ridiculous! Yes, I have report this as a bug NUMEROUS times and it is still not fixed.
View 9 Replies View RelatedHow to get list of threads of a process using C code in Linux?
View 6 Replies View RelatedI have done some searching around the internet and this site, but I haven't found a good way to count the context switches on a thread in a c++ program I am running. I need to know if it get swapped off of a CPU for correct timing.
View 4 Replies View RelatedI have a timer thread, and when it expires, it sets a flag. The only problem is, if any higher priority thread comes in between, then the timer is not expired in real time.Thus i want to set a highest priority to my thread. Now, i know 2 algos, which can make my thread in real time are: SCHED_FIFO and SCHED_RR.
So, here are my queries: 1) Which scheduling algo is best suited for this purpose? 2) Is it guaranted to work in real time if i use that algo (you suggest in 1) and set the max_priority by getting the maximum settable priority for that particular algorithm using, int sched_get_priority_max(int policy);
I have created an error logger thread in my application using pthread_create(), I want this thread to have a lower priority than my application's priority so that the application would run properly. Is there an easy way to do this? I know that we can change priority for thread created with policies FIFO or RR, since I don't set the policy for my application, I don't know what to set for my thread.
View 4 Replies View RelatedI want to suspend/resume a thread. The library I am using is pthread.h.I am also running my application on linux.Is there any function in pthread. let me suspend a thread temporary?I have read a document in which it was mentioned thatthread does not support suspend/resume
View 4 Replies View RelatedI seem to only be able to set my stack size on my linux server to 15000. If I increase it to 20000 I get a Segmentation Fault. how I can get the linux OS to increase the stack size? Code: threadRet |= pthread_attr_setstacksize( &m_ThreadAttributes, 15000 );
View 8 Replies View Related
