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Re: Set thread priority for linux [message #36507 is a reply to message #36504]

Sun, 03 June 2012 15:17

tojocky
Messages: 607
Registered: April 2008
Location: UK

Contributor

mirek wrote on Sun, 03 June 2012 14:15

I would like to add this patch, but (Ubuntu 10.04):

/home/cxl/upp.src/uppsrc/Core/Mt.cpp: In member function ‘void Upp::Thread::Priority(int)’:
/home/cxl/upp.src/uppsrc/Core/Mt.cpp:255:12: error: ‘SCHED_IDLE’ was not declared in this scope

...I guess more work is needed to resolve all compatiblity issues.

It has to work with Debian since 5, FreeBSD, MacOSX.

Mirek

You are right,
Sorry, I don't use old versions.

Please try this one:

void Thread::Priority(int percent)
{
	ASSERT(IsOpen());
#ifdef PLATFORM_WIN32
	int prior;
	if(percent <= 25)
		prior = THREAD_PRIORITY_LOWEST;
	else if(percent <= 75)
		prior = THREAD_PRIORITY_BELOW_NORMAL;
	else if(percent <= 125)
		prior = THREAD_PRIORITY_NORMAL;
	else if(percent <= 175)
		prior = THREAD_PRIORITY_ABOVE_NORMAL;
	else
		prior = THREAD_PRIORITY_HIGHEST;
	SetThreadPriority(handle, prior);
#endif
#ifdef PLATFORM_POSIX
	int policy, res;
	struct sched_param param;
	
	if ((res = pthread_getschedparam(handle, &policy, &param)) != 0){
		return;
		//TODO: should returns the error
	}
	int percen_min, percen_max;
	if(percent <= 25){
		#if defined(SCHED_IDLE)
			policy = SCHED_IDLE;
			percen_min = 0;
			percen_max = 25;
		#elif defined(SCHED_BATCH)
			policy = SCHED_BATCH;
			percen_min = 0;
			percen_max = 75;
		#else
			policy = SCHED_OTHER;
			percen_min = 0;
			percen_max = 125;
		#endif
	}else if(percent <= 75){
		#if defined(SCHED_IDLE)
			policy = SCHED_BATCH;
			percen_min = 25;
			percen_max = 75;
		#elif defined(SCHED_BATCH)
			policy = SCHED_BATCH;
			percen_min = 0;
			percen_max = 75;
		#else
			policy = SCHED_OTHER;
			percen_min = 0;
			percen_max = 125;
		#endif
	}else if(percent <= 125){
		policy = SCHED_OTHER;
		#if defined(SCHED_IDLE)
			percen_min = 75;
			percen_max = 125;
		#elif defined(SCHED_BATCH)
			percen_min = 25;
			percen_max = 125;
		#else
			percen_min = 0;
			percen_max = 125;
		#endif
	}else if(percent <= 175){// should be a root
		policy = SCHED_FIFO;
		percen_min = 125;
		percen_max = 175;
	}else{
		policy = SCHED_RR;
	}
	param.sched_priority = (sched_get_priority_max(policy) - sched_get_priority_min(policy))*(minmax(percent, percen_min, percen_max)-percen_min)/(percen_max - percen_min);
	
	if ((res = pthread_setschedparam(handle, policy, &param)) != 0){
		// don't have privileges? I'm trying maxim possible! I do not use EPERM because not all os support this one
		policy = SCHED_OTHER;
		percen_max = 125;
		percen_min = minmax(percen_min, 0, percen_max);
		param.sched_priority = (sched_get_priority_max(policy) - sched_get_priority_min(policy))*(minmax(percent, percen_min, percen_max)-percen_min)/(percen_max - percen_min);
		if ((res = pthread_setschedparam(handle, policy, &param)) != 0){
			return;
			//TODO: should returns the error
		}
	}
#endif
}

I have checked this functionality for MacOS, iOS, Linux and freebsd if it exists. My code I compared with QT.

Thank you Mirek!

Ion.

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