mainqueue.c

mainqueue.c

// in some .h file

extern void runOnMainQueue(dispatch_block_t block);
extern void asyncRunOnMainQueue(dispatch_block_t block);


// in some .m file

void runOnMainQueue(dispatch_block_t block)
{
    if (block) {
        if ([NSThread isMainThread]) {
            block();
        } else {
            dispatch_sync(dispatch_get_main_queue(), block);
        }
    }
}

void asyncRunOnMainQueue(dispatch_block_t block)
{
    if (block) {
        dispatch_async(dispatch_get_main_queue(), block);
    }
}