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The API sets the priority for the current thread, not an arbitrary thread.

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Implemented thread priority as the 'nice' value on Linux.  High priority threads require root permissions (you shouldn't give your game root permissions though!)
This commit is contained in:
Sam Lantinga 2011-03-25 12:44:06 -07:00
parent fb417a9de4
commit f0b1c9b859
9 changed files with 51 additions and 28 deletions
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33
src/thread/pthread/SDL_systhread.c
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@ -23,6 +23,11 @@
#include <pthread.h>
#include <signal.h>
#ifdef linux
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/syscall.h>
#endif
#include "SDL_thread.h"
#include "../SDL_thread_c.h"
@ -34,6 +39,7 @@ static const int sig_list[] = {
SIGVTALRM, SIGPROF, 0
};
static void *
RunThread(void *data)
{
@ -92,12 +98,29 @@ SDL_ThreadID(void)
}
int
SDL_SYS_SetThreadPriority(SDL_Thread * thread, SDL_ThreadPriority priority)
SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
{
#ifdef linux
int value;
if (priority == SDL_THREAD_PRIORITY_LOW) {
value = 19;
} else if (priority == SDL_THREAD_PRIORITY_HIGH) {
value = -20;
} else {
value = 0;
}
if (setpriority(PRIO_PROCESS, syscall(SYS_gettid), value) < 0) {
SDL_SetError("setpriority() failed");
return -1;
}
return 0;
#else
struct sched_param sched;
int policy;
pthread_t thread = pthread_self();
if (pthread_getschedparam(thread->handle, &policy, &sched) < 0) {
if (pthread_getschedparam(thread, &policy, &sched) < 0) {
SDL_SetError("pthread_getschedparam() failed");
return -1;
}
@ -108,14 +131,14 @@ SDL_SYS_SetThreadPriority(SDL_Thread * thread, SDL_ThreadPriority priority)
} else {
int min_priority = sched_get_priority_min(policy);
int max_priority = sched_get_priority_max(policy);
int priority = (min_priority + (max_priority - min_priority) / 2);
sched.sched_priority = priority;
sched.sched_priority = (min_priority + (max_priority - min_priority) / 2);
}
if (pthread_setschedparam(thread->handle, policy, &sched) < 0) {
if (pthread_setschedparam(thread, policy, &sched) < 0) {
SDL_SetError("pthread_setschedparam() failed");
return -1;
}
return 0;
#endif /* linux */
}
void