[Mac OS only] Enabling Runahead makes the application / core freeze after a minute

[Ryunam]

With the latest gambatte core and the latest Retroarch code on Mac OS (High Sierra), enabling Runahead makes the application / core freeze after around a minute of gameplay. You need to use a force-quit shortcut (Option+CMD+Esc) to quit the application.

This happens all the time, regardless of whether Second Instance is activated and irrespective of the specific content loaded (GB game, GBC game, etc.). The same core works perfectly with Runahead on Windows.

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[inactive123]

@Dwedit Might have something to do with the fact that the macOS port uses a different runloop as opposed to Windows/linux -

https://github.com/libretro/RetroArch/blob/master/ui/drivers/ui_cocoa.m

[jdgleaver]

It just occurred to me that this issue is most likely related to the fact that save states were broken (see PR #117) - i.e. after some length of time with run-ahead enabled, an uninitialized variable was randomly assigned a 'bad' value that trapped the core in an infinite loop. Save states are fixed now - could you try again?