What the mg_broadcast () Function Does

General
#1

What is the role of this code in the mongoose.c file?
#if MG_ENABLE_BROADCAST
mg_add_to_set (mgr-> ctl [1], & read_set, & max_fd);
#endif
What the mg_broadcast () Function Does?

#2

Mongoose core is not multi-threaded, thus must be performed in a single thread. However some operations could be long to execute, and user might offload the calculation to a different thread.

If that is done, the question is how to notify the mongoose thread from some other thread? That’s what mg_broadcast is for. mongoose thread sleeps on all sockets, wakes up when at least one of them has data, and handles IO. One of the socket is a socketpair created by the mg_mgr_init(). mg_broadcast sends data into that pipe, waking up mongoose thread, which receives the data and delivers it to active connections.

1 Like
#3

Thanks! But I see that mg_broadcast () is not called by any function! I commented out the function does not seem to have any effect?

#4

mg_broadcast is supposed to be used by a user code.
See multithreaded example in the examples folder.

#5

I don’t use multi-threaded files. My client uses websocket to communicate with the server. The program has only two threads under Linux. The communication thread is mongoose thread.

#6

If you don’t use multithreading, don’t use mg_broadcast , since there is no need to.