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Make some changes to SDL_SetThreadPriority to try and have SDL transparently handle more of the work.

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1. Comment that SDL_SetThreadPriority will make any necessary system changes when applying priority.
2. Add a hint to override SDL's default behavior for scheduler policy.
3. Modify the pthreads SDL_SetThreadPriority so that instead of just using the current thread scheduler policy it will change it to a policy that should work best for the requested priority.
4. Add hint checks in SDL_SetThreadPriority so that #3 can be overridden if desired.
5. Modify the Linux SDL_SetThreadPriority so that in the case that policy, either by SDL defaults or from the hint, is a realtime policy it uses the realtime rtkit API.
6. Prior to calling rtkit on Linux make the necessary thread state changes that rtkit requires.  Currently this is done every time as it isn't expected that SDL_SetThreadPriority will be called repeatedly for a thread.
This commit is contained in:
Sam Lantinga 2020-05-26 13:19:19 -07:00
parent f16e6bfa8e
commit abd5841850
4 changed files with 241 additions and 17 deletions
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13
include/SDL_hints.h
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@ -763,6 +763,19 @@ extern "C" {
*/
#define SDL_HINT_THREAD_STACK_SIZE "SDL_THREAD_STACK_SIZE"
/**
* \brief A string specifying additional information to use with SDL_SetThreadPriority.
*
* By default SDL_SetThreadPriority will make appropriate system changes in order to
* apply a thread priority. For example on systems using pthreads the scheduler policy
* is changed automatically to a policy that works well with a given priority.
* Code which has specific requirements can override SDL's default behavior with this hint.
*
* pthread hint values are "current", "other", "fifo" and "rr".
* Currently no other platform hint values are defined but may be in the future.
*/
#define SDL_HINT_THREAD_PRIORITY_POLICY "SDL_THREAD_PRIORITY_POLICY"
/**
* \brief If set to 1, then do not allow high-DPI windows. ("Retina" on Mac and iOS)
*/