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Added support for adjusting thread priorities using Linux RealtimeKit

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Michael Sartain

This is a quick pass at adding Linux RealtimeKit thread priority support to SDL.

It allows me to bump the thread priority to high without root privileges or setting any caps, etc.

rtkit readme here:
    http://git.0pointer.net/rtkit.git/tree/README
This commit is contained in:
Sam Lantinga 2018-04-23 17:10:36 -07:00
parent dc8b55e50b
commit 816a6e68e5
2 changed files with 99 additions and 2 deletions
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31
test/testthread.c
View file

@ -20,6 +20,7 @@
static SDL_TLSID tls;
static int alive = 0;
static int testprio = 0;
/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void
@ -29,14 +30,36 @@ quit(int rc)
exit(rc);
}
static const char *
getprioritystr(SDL_ThreadPriority priority)
{
switch(priority)
{
case SDL_THREAD_PRIORITY_LOW: return "SDL_THREAD_PRIORITY_LOW";
case SDL_THREAD_PRIORITY_NORMAL: return "SDL_THREAD_PRIORITY_NORMAL";
case SDL_THREAD_PRIORITY_HIGH: return "SDL_THREAD_PRIORITY_HIGH";
}
return "???";
}
int SDLCALL
ThreadFunc(void *data)
{
SDL_ThreadPriority prio = SDL_THREAD_PRIORITY_NORMAL;
SDL_TLSSet(tls, "baby thread", NULL);
SDL_Log("Started thread %s: My thread id is %lu, thread data = %s\n",
(char *) data, SDL_ThreadID(), (const char *)SDL_TLSGet(tls));
while (alive) {
SDL_Log("Thread '%s' is alive!\n", (char *) data);
if (testprio) {
SDL_Log("SDL_SetThreadPriority(%s):%d\n", getprioritystr(prio), SDL_SetThreadPriority(prio));
if (++prio > SDL_THREAD_PRIORITY_HIGH)
prio = SDL_THREAD_PRIORITY_LOW;
}
SDL_Delay(1 * 1000);
}
SDL_Log("Thread '%s' exiting!\n", (char *) data);
@ -55,6 +78,7 @@ killed(int sig)
int
main(int argc, char *argv[])
{
int arg = 1;
SDL_Thread *thread;
/* Enable standard application logging */
@ -66,6 +90,13 @@ main(int argc, char *argv[])
return (1);
}
while (argv[arg] && *argv[arg] == '-') {
if (SDL_strcmp(argv[arg], "--prio") == 0) {
testprio = 1;
}
++arg;
}
tls = SDL_TLSCreate();
SDL_assert(tls);
SDL_TLSSet(tls, "main thread", NULL);