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We are porting a linux app to macOS / iOS

The app uses a timer wheel and timer_t type. This type is not defined in time.h class of macOS as described in:

why is "timer_t" defined in "time.h" on Linux but not OS X

Also the methods timer_create(), timer_settime() and timer_delete() are not defined.

This is the class that I'm porting: https://github.com/OpenOverlayRouter/oor/blob/testing/oor/lib/timers.c

We found that maybe we can do this with NSTimer and Objective-C but I would like to do in C.

Can we do it in C? Which kernel libraries should we use?

Thanks

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    What system calls use this timer_t type, and what does the code use them for? Commented Jun 27, 2017 at 17:00
  • We use it in a timer wheel algorithm stackoverflow.com/questions/867621/efficient-timer-algorithm Commented Jun 27, 2017 at 17:24
  • I thought you said you were porting an application to macOS, but you're asking about how to port a library to allow you to not port the application. Am I right? Commented Jun 27, 2017 at 17:27
  • You're going to have to implement timer_settime on macOS, or rewrite that library to instead use some other timer callback scheme; maybe see how libevent or such implements timers on *BSD systems? Commented Jun 28, 2017 at 14:09
  • Yes, I have to implement timer_settime, timer_create, timer_delete and timer_t type, or search another way to provide the same function... @thrig Commented Jun 28, 2017 at 14:41

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After talking with Apple Support:

The most obvious candidate here is dispatch timer sources.

Now I'm working in other section of that project, after implementing the timers section I'll post more information about that if I found something interesting.

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    Any news? I understand that timer_create() and family are timer functions from the POSIX realtime library; I'm not sure libdispatch would be the most obvious candidate for anything realtime? Commented Oct 3, 2018 at 11:15
  • @RJVB crosspost: stackoverflow.com/questions/44807302/create-c-timer-in-macos/… Commented Dec 24, 2018 at 2:11

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