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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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5
include/SDL_thread.h
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@ -54,6 +54,11 @@ typedef unsigned int SDL_TLSID;
/**
* The SDL thread priority.
*
* SDL will make system changes as necessary in order to apply the thread priority.
* Code which attempts to control thread state related to priority should be aware
* that calling SDL_SetThreadPriority may alter such state.
* SDL_HINT_THREAD_PRIORITY_POLICY can be used to control aspects of this behavior.
*
* \note On many systems you require special privileges to set high or time critical priority.
*/
typedef enum {