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/* -*- c++ -*- */
/*
* Copyright 2006,2008,2013 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifndef INCLUDED_GNURADIO_REALTIME_H
#define INCLUDED_GNURADIO_REALTIME_H
#include <gnuradio/api.h>
#include <stdexcept>
/*!
* \brief System independent way to ask for realtime scheduling
*/
namespace gr {
typedef enum { RT_OK = 0, RT_NOT_IMPLEMENTED, RT_NO_PRIVS, RT_OTHER_ERROR } rt_status_t;
enum rt_sched_policy {
RT_SCHED_RR = 0, // round robin
RT_SCHED_FIFO = 1, // first in first out
};
namespace impl {
/*
* Define the range for our virtual priorities (don't change
* these)
*
* Processes (or threads) with numerically higher priority values
* are scheduled before processes with numerically lower priority
* values. Thus, the value returned by rt_priority_max() will be
* greater than the value returned by rt_priority_min().
*/
static inline int rt_priority_min() { return 0; }
static inline int rt_priority_max() { return 15; }
static inline int rt_priority_default() { return 1; }
struct GR_RUNTIME_API rt_sched_param {
int priority;
rt_sched_policy policy;
rt_sched_param() : priority(rt_priority_default()), policy(RT_SCHED_RR) {}
rt_sched_param(int priority_, rt_sched_policy policy_ = RT_SCHED_RR)
{
if (priority_ < rt_priority_min() || priority_ > rt_priority_max())
throw std::invalid_argument("rt_sched_param: priority out of range");
priority = priority_;
policy = policy_;
}
};
/*!
* \brief If possible, enable "realtime" scheduling.
* \ingroup misc
*
* In general, this means that the code will be scheduled before
* any non-realtime (normal) processes. Note that if your code
* contains an non-blocking infinite loop and you enable realtime
* scheduling, it's possible to hang the system.
*/
GR_RUNTIME_API rt_status_t enable_realtime_scheduling(rt_sched_param = rt_sched_param());
} /* namespace impl */
} /* namespace gr */
#endif /* INCLUDED_GNURADIO_REALTIME_H */
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