Provided by: libsdl3-doc_3.2.8+ds-1_all 

NAME
SDL_SetLinuxThreadPriorityAndPolicy - Sets the priority (not nice level) and scheduling policy for a thread.
HEADER FILE
Defined in SDL3/SDL_system.h
SYNOPSIS
#include "SDL3/SDL.h" bool SDL_SetLinuxThreadPriorityAndPolicy(Sint64 threadID, int sdlPriority, int schedPolicy);
DESCRIPTION
This uses setpriority() if possible, and RealtimeKit if available.
FUNCTION PARAMETERS
threadID the Unix thread ID to change priority of. sdlPriority the new SDL_ThreadPriority value. schedPolicy the new scheduling policy (SCHED_FIFO, SCHED_RR, SCHED_OTHER, etc...).
RETURN VALUE
Returns true on success or false on failure; call SDL_GetError () for more information.
AVAILABILITY
This function is available since SDL 3.2.0. Simple Directmedia Layer SDL 3.2.8 SDL_SetLinuxThreadPriorityAndPolicy(3)