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N3DS: Semaphore fixes. (#6776)

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* N3DS: Make Sem waits cooperative friendly.

The 3DS has a cooperative threading model. Sleeping after TryWait and
WaitTimeout avoid starving other threads. It inccurs a runtime penalty,
but it's better than having to hard reset your console to recover from
a deadlock.
This commit is contained in:
Pierre Wendling
2022-12-11 14:27:16 -05:00
committed by GitHub
parent bb6abd7b03
commit 053ce39d67
4 changed files with 34 additions and 27 deletions
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docs/README-n3ds.md
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@@ -25,3 +25,4 @@ cmake --install build
- SDL3_main should be used to ensure ROMFS is enabled.
- By default, the extra L2 cache and higher clock speeds of the New 2/3DS lineup are enabled. If you wish to turn it off, use `osSetSpeedupEnable(false)` in your main function.
- `SDL_GetBasePath` returns the romfs root instead of the executable's directory.
- The Nintendo 3DS uses a cooperative threading model on a single core, meaning a thread will never yield unless done manually through the `SDL_Delay` functions, or blocking waits (`SDL_LockMutex`, `SDL_SemWait`, `SDL_CondWait`, `SDL_WaitThread`). To avoid starving other threads, `SDL_SemTryWait` and `SDL_SemWaitTimeout` will yield if they fail to acquire the semaphore, see https://github.com/libsdl-org/SDL/pull/6776 for more information.