CODEWITHSUNDEEP
c++clinuxgtk
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Reputation: 6166

Calling method using main thread from secondary thread

I have called a method using a secondary thread. From inside the method i need to call a method from main thread.

here is the structure

void main_thread_method()
{

} 

void secondary_thread_method()
{

//do something here

  call main_thread_method() here using main thread

}

pthread thread1;

pthread_create (&thread1, NULL, (void *) &secondary_thread_method, NULL);

pthread_join(thread1);

Upvotes: 4

Views: 5235

Answers (2)

Tio Pepe
Tio Pepe

Reputation: 3089

I understood you want to invoke, from secondary thread, a method that must run in main thread. This is not possible. Invoked functions runs in the same thread. You mus use any kind of multi-threading communication method like semaphores, messages pooling, conditions, etc.

Upvotes: 1

parapura rajkumar
parapura rajkumar

Reputation: 24403

If your main thread is running a message pump you can post a message somehow to execute a function when your message is received.

Otherwise have a simple queue ( appropriate locking of course ). Add enough data into the queue so that main_thread_method can be called. (args etc). Periodically poll the simple queue for new messages in the main thread and process them.

Upvotes: 4

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