Re: [Boost-users] Several novice questions concerning threading

11 Apr 2012


      Thank you very much :)
for keeping track of my created threads i decided to use thread_groups and
accumulate them there . i came up with sth like this :

        boost::thread_group threadstore;

        threadstore.add_thread(&thread);
        threadstore.add_thread(&thread2);
        BOOST_FOREACH(boost::thread t ,threadstore.threads)
        {
            cout<boost::thread threadstore;

        threadstore.push_back(thread);
        threadstore.push_back(thread2);
        BOOST_FOREACH(boost::thread t ,threadstore)
        {
            cout<
#include 
using namespace std;

boost::uint64_t  i = 0;
boost::uint64_t  sum=0;
boost::mutex mutex;

void IteratorFunc()
{

    for (i ; i<100000; i++)
    {
        mutex.lock();
        sum+=i;
       cout< wrote:
...
Le 11/04/12 13:31, Master a écrit :
Hello all .
i am a newbie to the boost community . i recently started learning about
threads in boost . now there are some questions i would like to ask :
Welcome.
1.where can i find examples showing practical uses of boost::thread
features?
The documentation doesn't contains too much examples. You can take a look
at the libs/thread/example and tutorial directories :(
2.how can i get all threads ID issued by me in my app?
No direct way other that storing them in a container. What is your use
case?
3.how can i iterate through running threads in my app ?
No direct way other than storing a thread pointer in a container. What is
your use case?
4.is there any kind of means to get all the running threads using boost
library? if it does whats the calss? if it doesnt how can i do that?
See above. I think that you need to specialize the thread class so that it
inserts a handle to the created thread on a container at construction time
and remove it at destruction time.
5.can i resume a thread after pausing it ? ( how can i pause a thread? )
Boost.Thread doesn't provide fibers or resumable threads. There is
Boost.Fiber for that purpose (not yet in Boost).
6. how can i share a variable between two or more threads , suppose i
have a loop , i want two threads to simultaneously iterate through it , if
thread1 counted to 3, thread2 continues it from 4 and so on . ?
i already tried
You need to protect the access to the loop index variable 'i' with a mutex
as you did with sum.
HTH,
Vicente
------
...
what is wrong with my sample app ?
#include <iostream>
#include 
using namespace std;
using namespace boost;
mutex bmutex;
int i=0;
int sum=0;
void IteratorFunc(int threadid)
{
             for (  ; i<25 ; i++)
            {
                    lock_guard<mutex> locker(bmutex);
cout<<"\t"<
int main()
{
    //boost::posix_time::ptime start =
boost::posix_time::microsec_clock::local_time();
thread thrd(IteratorFunc,1);
    thread thrd2(IteratorFunc,2);
cout<
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