Boost::Thread: Removing a thread from a dynamic group? - c++

Question

Consider this context:
Having a group of threads doing some work (that work is in a infinite loop, embedded project) where the number of threads (and some parameters) depends from a Database result.
What I need is to remove or create threads from that group when there´s a change in the database.
Here is the code:
for (result::const_iterator pin = pinesBBB.begin(); pin != pinesBBB.end(); ++pin)
{
string pinStr = pin["pin"].as<string>();
boost::thread hiloNuevo(bind(WorkPin, pinStr));
Worker.add_thread(&hiloNuevo);
}
Where result is pqxx::result from pqxx library.
This piece of code iterates a table from an SQL query result and creates a thread for every record found.
After that, there´s this code that checks the same table every a couple of minutes:
`
void ThreadWorker(boost::thread_group *worker, string *pinesLocales)
{
int threadsVivosInt = worker->size();
string *pinesDB;
int contador;
for (;;)
{
contador = 0;
sleep(60);
try
{
result pinesBBB = TraerPines();
for (result::const_iterator pin = pinesBBB.begin(); pin != pinesBBB.end(); ++pin)
{
pinesDB[contador] = pin["pin"].as<string>();
contador++;
}
thread hiloMuerto
}
catch (...)
{
sleep(360);
}
}
}
`
What I want to do is access this thread_group worker and remove one of those threads.
I´ve tryed using an Int index like worker[0] and with thread´s ID boost::thread::id
I can remove a thread using a native_handle and then using an plattform specific like pthread_cancel but I can´t get the thread from the thread group.
Any ideas? Thanks!

Answer 1

boost::thread_group::remove_thread() removes the specified thread from a given thread_group. Once you've done this, you're now responsible for managing the thread.