CODEWITHSUNDEEP
c++macos
Pier
Pier

Reputation: 10827

Delaying a function call on OS X

I've seen there is a sleep method in the Win32 API and also a timer class to delay function calls.

Is there something similar that I can use on Mac OS?

I want a simple solution to create some sort of setTimeout function found in JavaScript and AS3.

Upvotes: 1

Views: 1131

Answers (5)

mouviciel
mouviciel

Reputation: 67849

You can look at Unix calls like sleep() and poll().

Upvotes: 0

ivanzoid
ivanzoid

Reputation: 6062

You may do it using 2 methods:

1) Use NSObject's performSelector:withObject:afterDelay:

2) Use Grand Central Dispatch, like this:

dispatch_time_t delay = dispatch_time(DISPATCH_TIME_NOW, interval * NSEC_PER_SEC);
dispatch_after(delay, dispatch_get_main_queue(), ^{
    your code here
});

Or, for shorter syntax, you may add the following functions somewhere to your project:

void Dispatch_AfterDelay(dispatch_queue_t queue, NSTimeInterval afterInterval, dispatch_block_t block)
{
    dispatch_time_t delay = dispatch_time(DISPATCH_TIME_NOW, afterInterval * NSEC_PER_SEC);
    dispatch_after(delay, queue, block);
}

void Dispatch_AfterDelay_ToMainThread(NSTimeInterval afterInterval, dispatch_block_t block)
{
    Dispatch_AfterDelay(dispatch_get_main_queue(), afterInterval, block);
}

And then you just call:

Dispatch_AfterDelay_ToMainThread(5.0, ^{
    your code
});

Upvotes: 4

Monolo
Monolo

Reputation: 18253

If you can write a C function (or a block) to wrap your C++ code, then you can use Grand Central Dispatch.

Look at dispatch_after_f for a delayed call of a function or dispatch_after for its block based equivalent.

Upvotes: 0

Michael Dautermann
Michael Dautermann

Reputation: 89509

CFTimer actually exists in Core Foundation, which is C++ & C compatible.

It's not very well documented at all, from what I can tell. Here is a related question that mentions it.

On a higher level, there's also the standard C call of sleep (I've linked the man page for you here), and if you want to do this as a setTimeout type of function you could figure out a way to do sleep from a separate thread and then when it finishes (without being killed), consider things "timed out".

Upvotes: 2

user1118321
user1118321

Reputation: 26375

You can do that with an NSTimer.

Upvotes: 0

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