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// PyEPL: hardware/rt/realtime.cpp
//
// Copyright (C) 2003-2005 Michael J. Kahana
// Authors: Ian Schleifer, Per Sederberg, Aaron Geller, Josh Jacobs
// URL: http://memory.psych.upenn.edu/programming/pyepl
//
// Distributed under the terms of the GNU Lesser General Public License
// (LGPL). See the license.txt that came with this file.
#include "realtime.h"
#include <iostream>
using std::cout;
using std::cerr;
using std::endl;
void set_realtime_priority(int period, int computation, int constraint)
{
struct thread_time_constraint_policy ttcpolicy;
int bus_speed, mib [2] = { CTL_HW, HW_BUS_FREQ };
size_t len;
int ret;
len = sizeof (bus_speed);
sysctl (mib, 2, &bus_speed, &len, NULL, 0);
// 120, 2400, 1200 original
// 120, 9600, 1200 on Powerbook
/* Is it enough? */
ttcpolicy.period = bus_speed / period;
ttcpolicy.computation = bus_speed / computation;
ttcpolicy.constraint = bus_speed / constraint;
ttcpolicy.preemptible = 1;
ret = thread_policy_set(mach_thread_self (),
THREAD_TIME_CONSTRAINT_POLICY,
(int*)&ttcpolicy,
THREAD_TIME_CONSTRAINT_POLICY_COUNT);
if (ret != KERN_SUCCESS)
{
// it failed
cerr << "Set realtime priority failed" << endl;
}
}
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