glibmm 2.34.1

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thread/thread.cc

A glibmm thread example.

#include <iostream>
#include <queue>
#include <glibmm/threads.h>
#include <glibmm/random.h>
#include <glibmm/timer.h>
#include <glibmm/init.h>
namespace
{
class MessageQueue : public sigc::trackable
{
public:
MessageQueue();
~MessageQueue();
void producer();
void consumer();
private:
Glib::Threads::Mutex mutex_;
Glib::Threads::Cond cond_push_;
Glib::Threads::Cond cond_pop_;
std::queue<int> queue_;
};
MessageQueue::MessageQueue()
{}
MessageQueue::~MessageQueue()
{}
void MessageQueue::producer()
{
Glib::Rand rand (1234);
for(int i = 0; i < 200; ++i)
{
{
Glib::Threads::Mutex::Lock lock (mutex_);
while(queue_.size() >= 64)
cond_pop_.wait(mutex_);
queue_.push(i);
std::cout << '*';
std::cout.flush();
cond_push_.signal();
}
if(rand.get_bool())
continue;
Glib::usleep(rand.get_int_range(0, 100000));
}
}
void MessageQueue::consumer()
{
Glib::Rand rand (4567);
for(;;)
{
{
Glib::Threads::Mutex::Lock lock (mutex_);
while(queue_.empty())
cond_push_.wait(mutex_);
const int i = queue_.front();
queue_.pop();
std::cout << "\x08 \x08";
std::cout.flush();
cond_pop_.signal();
if(i >= 199)
break;
}
if(rand.get_bool())
continue;
Glib::usleep(rand.get_int_range(10000, 200000));
}
}
}
int main(int, char**)
{
Glib::init();
MessageQueue queue;
Glib::Threads::Thread *const producer = Glib::Threads::Thread::create(
sigc::mem_fun(queue, &MessageQueue::producer));
Glib::Threads::Thread *const consumer = Glib::Threads::Thread::create(
sigc::mem_fun(queue, &MessageQueue::consumer));
producer->join();
consumer->join();
std::cout << std::endl;
return 0;
}