epoll Questions
1
Solved
The Linux kernel manpages declare the epoll_ctl procedure as follows:
int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event);
As evident, the event parameter is declared as a pointer...
3
I wrote a simple UDP Server program to understand more about possible network bottlenecks.
UDP Server: Creates a UDP socket, binds it to a specified port and addr, and adds the socket file descri...
Mcdermott asked 9/2, 2014 at 20:57
3
Solved
I use TCP Keep-Alive option to detect dead connection. It works well with connection that use reading sockets:
setsockopt(mysock,...) // set various keep alive options
epoll_ctl(ep,mysock,{EPOLLI...
Plyler asked 1/5, 2013 at 14:29
1
Solved
I'm currently adding sockfds created from accept to an epoll instance with the following events:
const int EVENTS = (
EPOLLET |
EPOLLIN |
EPOLLRDHUP |
EPOLLONESHOT |
EPOLLERR |
EPOLLHUP);
...
1
Solved
I'm rather new to event based programming. I'm experimenting with epoll's edge-mode which apparently only signals files which have become ready for read/write (as opposed to level-mode which signal...
Dude asked 23/7, 2015 at 8:23
1
Solved
When I run this little main from rfxcom python library :
from asyncio import get_event_loop
from rfxcom.transport import AsyncioTransport
dev_name = '/dev/serial/by-id/usb-RFXCOM_RFXtrx433_A1XZI13...
Levelheaded asked 20/7, 2015 at 21:19
1
Solved
Is it safe to share the same Epoll fd (not socket fd) among several threads? And if so, will each thread have to pass its own events array to epoll_wait(2) or can they share it?
For example
void...
1
Solved
I have a single-threaded Linux application using boost::asio for asynchronous input/output. Now I need to extend this application to read in GPIO inputs on /sys/class/gpio/gpioXX/value.
It is poss...
Jyoti asked 26/5, 2015 at 12:44
0
I am working on a small library for creating a pair of connected pts. I use an epoll fd, in which I register the master fd for two pseudo-terminals for EPOLLIN events. When my example client progra...
1
NGNIX uses epoll notification to know if there is any data on the socket to read.
Let assume:
There are two requests to the server.
nginx is notificated about this two requests and starts to:
re...
Breastplate asked 29/4, 2015 at 17:4
2
Solved
I have read a couple of networking books to get some idea of differences between epoll and select but they only covered this concepts slightly. I will be appreciated if you guys can provide me the ...
3
Solved
I'm doing some threaded asynchronous networking experiment in python, using UDP.
I'd like to understand polling and the select python module, I've never used them in C/C++.
What are those for ? I...
Sheltonshelty asked 18/9, 2011 at 4:6
3
Solved
The title really says it all.
The and ... means also include pselect and ppoll..
The server project I'm working on basically structured with multiple threads. Each
thread handles one or more sess...
1
Solved
I'm using non-blocking read/writes over a client-server TCP connection with epoll_wait.
Problem is, I can't reliably detect 'peer closed connection' event using the EPOLLRDHUP flag. It often happe...
1
Solved
Suppose I create epoll file descriptor (epfd) by call
epfd = epoll_create( 10 );
Next I adding some count of file descriptors into this set by calling epoll_ctl(epfd,EPOLL_CTL_ADD,...) and wait ...
Trabue asked 24/10, 2014 at 11:17
1
Solved
I am reading Redis recently.
Redis implements a simple event-driven library based on I/O multiplexing.
Redis says it would choose the best multiplexing supported by the system, and gives the follow...
Plasticize asked 17/10, 2014 at 8:29
1
Solved
On an edge triggered epoll event I read a socket (or multiple sockets, if required) until there is no more data (EAGAIN or EWOULDBLOCK) then loop back to epoll_wait. What happens if, while processi...
10
Here is my server
"""Server using epoll method"""
import os
import select
import socket
import time
from oodict import OODict
addr = ('localhost', 8989)
s = socket.socket(socket.AF_INET, socke...
2
I am using epoll_ctl() and epoll_wait() system calls.
int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event);
int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int ti...
Uralian asked 8/7, 2014 at 2:56
1
Solved
How to notify the user space application whenever an event occurs in the kernel space?
A hardware generates an interrupt when the data arrives at some GPIO.
This data is copied to the kernel buffe...
Romantic asked 27/6, 2014 at 5:40
4
I need an async connect and disconnect for a TCP client using epoll on Linux. There are ext. functions in Windows, such as ConnectEx, DisconnectEx, AcceptEx, etc.
For the TCP server, the standard a...
Platitudinous asked 17/4, 2012 at 8:0
2
Solved
I have seen a lot of comparisons which says select have to walk through the fd list, and this is slow. But why doesn't epoll have to do this?
3
Is there a PHP extension (stability is irrelevant) that allows for direct epoll, kqueue, /dev/poll polling functions without going through libevent or libev extensions?
2
Solved
My application is going to send huge amount of data over network, so I decided (because I'm using Linux) to use epoll and splice. Here's how I see it (pseudocode):
epoll_ctl (file_fd, EPOLL_CTL_AD...
3
I recall a very fast kernel module for Linux called "TUX" for static files to answer IIS's superior-to-Linux static file web-serving performance and solve the "C10K problem." Now I keep seeing:
N...
Jungle asked 15/11, 2013 at 0:25
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