multithreading - Creating multiple threads in C: write pid, tid and return integer -


i must this:

write program main thread creates 3 other threads. each ot these threads (different main thread) shall write pid , tid , terminate returning integer number between 1 , 3 , different value returned other threads. main thread shall print in standard out pid , value returned each of other threads.

i think i'm doing right, except don't understand how should return integer numbers between 1 , 3

i've following code far:

#include <stdio.h> #include <unistd.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <pthread.h> #define debug 0  // int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine)(void*), void *arg);  // int pthread_join(pthread_t, void **value_ptr);  void *printid(void *arg){      int i;      unsigned long tid;     tid = *((unsigned long *) arg);                 printf("thread tid: %lu thread pid: %d \n", tid, getpid());  }  int main(int argc, char *argv[]) {      pthread_t id1, id2, id3;      pthread_create(&id1, null, printid, &id1);      pthread_create(&id2, null, printid, &id2);      pthread_create(&id3, null, printid, &id3);      pthread_join(id1, null);      pthread_join(id2, null);      pthread_join(id3, null);      printf("main thread pid: %d\n", getpid());      sleep(1);  }

since threads in c can return void*. can allocate space int want return, read main, don’t forget free it.


Comments

Post a Comment

Popular posts from this blog

jquery - How do you format the date used in the popover widget title of FullCalendar? -

Image
in fullcalendar, how format date used in popover widget title when clicking '+n more'? code: <div class="fc-popover fc-more-popover"> <div class="fc-header fc-widget-header"> <span class="fc-close fc-icon fc-icon-x"></span> <span class="fc-title">tuesday, april 7</span> ... </div> ... </div> you use daypopoverformat that. determines date format of title of popover created eventlimitclick option. must date formatting string. default value "dddd, mmmm d" english , "ll" other languages.
Read more

asp.net mvc - SSO between MVCForum and Umbraco7 -

i need integrate sso between mvcforum (forum of company) , umbraco7 (manages cms company). however struggling shared authentication work. tried several ways suggested on other threads still not running expected. here did: 1. in mvcforum (forum.mywebsite.com) 1.1. machine key in web.xml: <machinekey validationkey="the same key umbraco7" decryptionkey="the same key umbraco7" validation="sha1" decryption="aes" /> 1.2. authenticate forms in web.xml <forms name="my-sso-auth" protection="all" path="/" timeout="43200" domain="forum.mywebsite.com" loginurl="/members/logon" enablecrossappredirects="true" /> 2. in umbraco7 (news.mywebsite.com) 2.1. machine key in web.xml: <machinekey validationkey="the same key mvcforum" decryptionkey="the same key mvcforum" validation="sha1" decryption="aes" /> 2.2. a...
Read more

Python Tkinter keyboard using bind -

i have problem using bind option can click button in keyboard, , call function once key pressed. tried taking other codes have similar purpose , saw i'm doing pretty same, though still have problem must've missed. thankful if me this. here's code: # -*- coding: utf-8 -*- #imports tkinter import * pil import imagetk, image import time import tkmessagebox #===========================================================================================================================================# #tkinter class class app(frame): def __init__(self, master=none): frame.__init__(self, master) self.pack() #===========================================================================================================================================# #game pieces classes class board: def __init__(self, rows = 7, columns = 6, picture_height = none, picture_width = none): self.rows = rows self.columns = columns self.picture ...
Read more