Visit Our UNIX and Linux User Community

Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

iv_init(3) [debian man page]

iv_init(3)						    ivykis programmer's manual							iv_init(3)

NAME
iv_init, iv_deinit, iv_inited - initialise and deinitialise ivykis SYNOPSIS
#include <iv.h> void iv_init(void); void iv_deinit(void); int iv_inited(void); DESCRIPTION
iv_init initialises the current thread's ivykis event loop. Each thread that wants to use ivykis must call iv_init before any other ivykis functions are called. The very first call to iv_init in a process must run to completion before other threads are allowed to call iv_init, but subsequent calls to iv_init can be done concurrently. iv_deinit frees all resources allocated by ivykis in this thread, and should be called before this thread exits. iv_inited returns true if iv_init has been called in this thread. After iv_deinit is called, it will return false. SEE ALSO
ivykis(3), iv_examples(3) ivykis 2010-09-05 iv_init(3)

Check Out this Related Man Page

iv_tls(3)						    ivykis programmer's manual							 iv_tls(3)

NAME
iv_tls_user_register, iv_tls_user_ptr - thread-local storage handling for ivykis modules SYNOPSIS
#include <iv_tls.h> struct iv_tls_user { size_t sizeof_state; void (*init_thread)(void *st); void (*deinit_thread)(void *st); }; void iv_tls_user_register(struct iv_tls_user *tu); void *iv_tls_user_ptr(struct iv_tls_user *tu); DESCRIPTION
The iv_tls interface provides thread-local storage handling to ivykis modules. An ivykis module can arrange for an amount of memory to be allocated for its use in each ivykis thread by calling iv_tls_user_register. This must be done before any calls to iv_init have been made in this process, and is typically done from a module initialization function marked as a constructor function. The ->sizeof_state member of the passed-in structure indicates how many bytes of memory the module wants allocated for its use in every ivykis thread. When a thread calls iv_init, ->sizeof_state bytes of memory will be allocated for use by this module in that thread, and initialised to zero. A pointer to this memory area can be obtained by calling iv_tls_user_ptr (which returns NULL in non-ivykis threads). If the specified ->init_thread function pointer is not NULL, it will be invoked at the end of iv_init, with its argument pointing to this thread's memory area allocation for this module. If ->deinit_thread is not NULL, it will be invoked at the start of iv_deinit, or if the thread fails to call iv_deinit before terminating, at thread termination time. The argument passed into ->deinit_thread is the same as for ->init_thread. It is permitted to call any ivykis API functions from the ->init_thread and ->deinit_thread callbacks. There is no explicit serialization on calls to ->init_thread and ->deinit_thread. Care must be taken when calling iv_tls_user_ptr from a signal handler, as there is a time window where it will return a non-NULL value before ->init_thread or after ->deinit_thread have been called. Use of iv_tls for managing thread-local state is preferred over direct use of the __thread keyword, as not all platforms that ivykis runs on provide the __thread keyword. Use of iv_tls for managing thread-local state is preferred over direct use of the pthread_key_create and pthread_setspecific APIs, as iv_tls provides a thread init hook as well as a destructor hook, and properly sequences ->init_thread and ->deinit_thread calls with core ivykis initialization and cleanup. SEE ALSO
iv_init(3) ivykis 2012-03-30 iv_tls(3)

13 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Adding the individual columns of a matrix.

I have a huge matrix file containing some 1.5 million rows and 6000 columns. The matrix looks something like this: 1 2 3 4 5 6 7 8 9 3 4 5 I want to add all the numbers in the columns of this matrix and display the result to my stdout. This means that the numbers in the first column are: ... (2 Replies)
Discussion started by: shoaibjameel123
2 Replies

2. Shell Programming and Scripting

awk or sed - Convert 2 lines to 1 line

Hi, Just trying to get to grips with sed and awk for some reporting for work and I need some assistance: I have a file that lists policy names on the first line and then on the second line whether the policy is active or not. Policy Name: Policy1 Active: yes Policy... (8 Replies)
Discussion started by: guinch
8 Replies

3. Shell Programming and Scripting

How can I do this in VI editor?

version info : vi availabe with RHEL 5.4 I have a text file with 10,000 lines. I want to copy lines from 5000th line to 7000th and redirect to a file. Any idea how I can do this? Note: The above scenario is just an example. In my actual requirement, the file has 14 million lines and I want... (9 Replies)
Discussion started by: kraljic
9 Replies

4. Fedora

Is UNIX an open source OS ?

Hi everyone, I know the following questions are noobish questions but I am asking them because I am confused about the basics of history behind UNIX and LINUX. Ok onto business, my questions are-: Was/Is UNIX ever an open source operating system ? If UNIX was... (21 Replies)
Discussion started by: sreyan32
21 Replies

5. What is on Your Mind?

Introduction

Hello, I couldn't find an actual introduction thread, so I decided to just put this here. I go by d0wngrade online. I have been programming in multiple languages for about 15+ years. I started with standard web design languages like HTML and CSS, but I then advanced from design to development... (2 Replies)
Discussion started by: d0wngrade
2 Replies

6. UNIX for Advanced & Expert Users

Detecting unused variables...

Hi guys... The first active code line in AudioScope.sh is set -u . This causes a complete exit if a variable is used/found but has not been allocated at the start of the program. However, apart from writing code to do the task, is there a switch to to check which variables have been... (17 Replies)
Discussion started by: wisecracker
17 Replies

7. Shell Programming and Scripting

One instance of comparing grep and awk

Hi. In thread https://www.unix.com/shell-programming-and-scripting/267833-grouping-counting.html rovf and I had a mini-discussion on grep and awk. Here is a demo script that compares the awk and grep approaches for this single problem: #!/usr/bin/env bash # @(#) s2 Demonstrate group... (1 Reply)
Discussion started by: drl
1 Replies

8. Shell Programming and Scripting

Find columns in a file based on header and print to new file

Hello, I have to fish out some specific columns from a file based on the header value. I have the list of columns I need in a different file. I thought I could read in the list of headers I need, # file with header names of required columns in required order headers_file=$2 # read contents... (11 Replies)
Discussion started by: LMHmedchem
11 Replies

9. OS X (Apple)

Installing Dash Shell on OS X Lion

For those interested in installing dash shell on OSX Lion to help test POSIX compliancy of shell scripts, it is quite easy. I did it like this: If you don't have gcc on your system: 0. Download and install the Command Line Tools for Xcode package from Sign In - Apple * 1. Download the dash... (2 Replies)
Discussion started by: Scrutinizer
2 Replies

10. UNIX for Beginners Questions & Answers

Weird 'find' results

Hello and thanks in advance for any help anyone can offer me I'm trying to learn the find command and thought I was understanding it... Apparently I was wrong. I was doing compound searches and I started getting weird results with the -size test. I was trying to do a search on a 1G file owned by... (14 Replies)
Discussion started by: bodisha
14 Replies

11. UNIX for Beginners Questions & Answers

How to copy a column of multiple files and paste into new excel file (next to column)?

I have data of an excel files as given below, file1 org1_1 1 1 2.5 100 org1_2 1 2 5.5 98 org1_3 1 3 7.2 88 file2 org2_1 1 1 2.5 100 org2_2 1 2 5.5 56 org2_3 1 3 7.2 70 I have multiple excel files as above shown. I have to copy column 1, column 4 and paste into a new excel file as... (26 Replies)
Discussion started by: dineshkumarsrk
26 Replies

12. What is on Your Mind?

New UNIX and Linux History Sections

Dear All, Taking a break from Vue.js coding for the site, SEO and YT videos; and hopefully addressing some well deserved criticism from some here that I have been too focused on the visual aspects of the forums versus the substance and the community.... While the "current generation... (9 Replies)
Discussion started by: Neo
9 Replies

13. Programming

My first PERL incarnation... Audio Oscillograph

Hi all... Well guys and gals, I jumped in at the deep end and found things that PERL cannot do by default. Many tricky terminal escape codes are not catered for so I had to create workarounds. One thing I searched for was this: Passing perl variable to shell command AND, @Neo this was... (15 Replies)
Discussion started by: wisecracker
15 Replies

Featured Tech Videos