mirror of https://github.com/davisking/dlib.git
139 lines
4.2 KiB
C++
139 lines
4.2 KiB
C++
// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
|
|
/*
|
|
|
|
This is an example illustrating the use of the multithreaded_object.
|
|
|
|
This is a very simple example. It creates 3 threads that
|
|
just print messages to the screen.
|
|
|
|
|
|
|
|
Example program output:
|
|
0 INFO [1] mto: thread1(): hurray threads!
|
|
0 INFO [2] mto: thread2(): hurray threads!
|
|
0 INFO [3] mto: thread2(): hurray threads!
|
|
700 INFO [1] mto: thread1(): hurray threads!
|
|
800 INFO [2] mto: thread2(): hurray threads!
|
|
801 INFO [3] mto: thread2(): hurray threads!
|
|
1400 INFO [1] mto: thread1(): hurray threads!
|
|
1604 INFO [2] mto: thread2(): hurray threads!
|
|
1605 INFO [3] mto: thread2(): hurray threads!
|
|
2100 INFO [1] mto: thread1(): hurray threads!
|
|
2409 INFO [2] mto: thread2(): hurray threads!
|
|
2409 INFO [3] mto: thread2(): hurray threads!
|
|
2801 INFO [1] mto: thread1(): hurray threads!
|
|
3001 INFO [0] mto: paused threads
|
|
6001 INFO [0] mto: starting threads back up from paused state
|
|
6001 INFO [2] mto: thread2(): hurray threads!
|
|
6001 INFO [1] mto: thread1(): hurray threads!
|
|
6001 INFO [3] mto: thread2(): hurray threads!
|
|
6705 INFO [1] mto: thread1(): hurray threads!
|
|
6805 INFO [2] mto: thread2(): hurray threads!
|
|
6805 INFO [3] mto: thread2(): hurray threads!
|
|
7405 INFO [1] mto: thread1(): hurray threads!
|
|
7609 INFO [2] mto: thread2(): hurray threads!
|
|
7609 INFO [3] mto: thread2(): hurray threads!
|
|
8105 INFO [1] mto: thread1(): hurray threads!
|
|
8413 INFO [2] mto: thread2(): hurray threads!
|
|
8413 INFO [3] mto: thread2(): hurray threads!
|
|
8805 INFO [1] mto: thread1(): hurray threads!
|
|
|
|
The first column is the number of milliseconds since program start, the second
|
|
column is the logging level, the third column is the thread id, and the rest
|
|
is the log message.
|
|
*/
|
|
|
|
|
|
#include <iostream>
|
|
#include <dlib/threads.h>
|
|
#include <dlib/misc_api.h> // for dlib::sleep
|
|
#include <dlib/logger.h>
|
|
|
|
using namespace std;
|
|
using namespace dlib;
|
|
|
|
logger dlog("mto");
|
|
|
|
class my_object : public multithreaded_object
|
|
{
|
|
public:
|
|
my_object()
|
|
{
|
|
// register which functions we want to run as threads. We want one thread running
|
|
// thread1() and two threads to run thread2(). So we will have a total of 3 threads
|
|
// running.
|
|
register_thread(*this,&my_object::thread1);
|
|
register_thread(*this,&my_object::thread2);
|
|
register_thread(*this,&my_object::thread2);
|
|
|
|
// start all our registered threads going by calling the start() function
|
|
start();
|
|
}
|
|
|
|
~my_object()
|
|
{
|
|
// Tell the thread() function to stop. This will cause should_stop() to
|
|
// return true so the thread knows what to do.
|
|
stop();
|
|
|
|
// Wait for the threads to stop before letting this object destruct itself.
|
|
// Also note, you are *required* to wait for the threads to end before
|
|
// letting this object destruct itself.
|
|
wait();
|
|
}
|
|
|
|
private:
|
|
|
|
void thread1()
|
|
{
|
|
// This is a thread. It will loop until it is told that it should terminate.
|
|
while (should_stop() == false)
|
|
{
|
|
dlog << LINFO << "thread1(): hurray threads!";
|
|
dlib::sleep(700);
|
|
}
|
|
}
|
|
|
|
void thread2()
|
|
{
|
|
// This is a thread. It will loop until it is told that it should terminate.
|
|
while (should_stop() == false)
|
|
{
|
|
dlog << LINFO << "thread2(): hurray threads!";
|
|
dlib::sleep(800);
|
|
}
|
|
}
|
|
|
|
};
|
|
|
|
int main()
|
|
{
|
|
// tell the logger to output all messages
|
|
dlog.set_level(LALL);
|
|
|
|
// Create an instance of our multi-threaded object.
|
|
my_object t;
|
|
|
|
dlib::sleep(3000);
|
|
|
|
// Tell the multi-threaded object to pause its threads. This causes the
|
|
// threads to block on their next calls to should_stop().
|
|
t.pause();
|
|
dlog << LINFO << "paused threads";
|
|
|
|
dlib::sleep(3000);
|
|
dlog << LINFO << "starting threads back up from paused state";
|
|
|
|
// Tell the threads to unpause themselves. This causes should_stop() to unblock
|
|
// and to let the threads continue.
|
|
t.start();
|
|
|
|
dlib::sleep(3000);
|
|
|
|
// Let the program end. When t is destructed it will gracefully terminate your
|
|
// threads because we have set the destructor up to do so.
|
|
}
|
|
|
|
|
|
|