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//
// Copyright 2010 Ettus Research LLC
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#include <uhd/utils/thread_priority.hpp>
#include <uhd/utils/warning.hpp>
#include <boost/format.hpp>
#include <stdexcept>
#include <iostream>
bool uhd::set_thread_priority_safe(float priority, bool realtime){
try{
set_thread_priority(priority, realtime);
return true;
}catch(const std::exception &e){
uhd::warning::post(str(boost::format(
"%s\n"
"Failed to set thread priority %d (%s):\n"
"Performance may be negatively affected.\n"
"See the general application notes.\n"
) % e.what() % priority % (realtime?"realtime":"")));
return false;
}
}
static void check_priority_range(float priority){
if (priority > +1.0 or priority < -1.0)
throw std::range_error("priority out of range [-1.0, +1.0]");
}
/***********************************************************************
* Pthread API to set priority
**********************************************************************/
#if defined(HAVE_PTHREAD_SETSCHEDPARAM)
#include <pthread.h>
void uhd::set_thread_priority(float priority, bool realtime){
check_priority_range(priority);
//when realtime is not enabled, use sched other
int policy = (realtime)? SCHED_RR : SCHED_OTHER;
//we cannot have below normal priority, set to zero
if (priority < 0) priority = 0;
//get the priority bounds for the selected policy
int min_pri = sched_get_priority_min(policy);
int max_pri = sched_get_priority_max(policy);
if (min_pri == -1 or max_pri == -1) throw std::runtime_error("error in sched_get_priority_min/max");
//set the new priority and policy
sched_param sp;
sp.sched_priority = int(priority*(max_pri - min_pri)) + min_pri;
int ret = pthread_setschedparam(pthread_self(), policy, &sp);
if (ret != 0) throw std::runtime_error("error in pthread_setschedparam");
}
/***********************************************************************
* Windows API to set priority
**********************************************************************/
#elif defined(HAVE_WIN_SETTHREADPRIORITY)
#include <windows.h>
void uhd::set_thread_priority(float priority, bool realtime){
check_priority_range(priority);
//set the priority class on the process
int pri_class = (realtime)? REALTIME_PRIORITY_CLASS : NORMAL_PRIORITY_CLASS;
if (SetPriorityClass(GetCurrentProcess(), pri_class) == 0)
throw std::runtime_error("error in SetPriorityClass");
//scale the priority value to the constants
int priorities[] = {
THREAD_PRIORITY_IDLE, THREAD_PRIORITY_LOWEST, THREAD_PRIORITY_BELOW_NORMAL, THREAD_PRIORITY_NORMAL,
THREAD_PRIORITY_ABOVE_NORMAL, THREAD_PRIORITY_HIGHEST, THREAD_PRIORITY_TIME_CRITICAL
};
size_t pri_index = size_t((priority+1.0)*6/2.0); // -1 -> 0, +1 -> 6
//set the thread priority on the thread
if (SetThreadPriority(GetCurrentThread(), priorities[pri_index]) == 0)
throw std::runtime_error("error in SetThreadPriority");
}
/***********************************************************************
* Unimplemented API to set priority
**********************************************************************/
#else
void uhd::set_thread_priority(float, bool){
throw std::runtime_error("set thread priority not implemented");
}
#endif /* HAVE_PTHREAD_SETSCHEDPARAM */
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