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// Copyright 2018 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
use {errno_result, Result};
/// Enables real time thread priorities in the current thread up to `limit`.
pub fn set_rt_prio_limit(limit: u64) -> Result<()> {
let rt_limit_arg = libc::rlimit {
rlim_cur: limit as libc::rlim_t,
rlim_max: limit as libc::rlim_t,
};
// Safe because the kernel doesn't modify memory that is accessible to the process here.
let res = unsafe { libc::setrlimit(libc::RLIMIT_RTPRIO, &rt_limit_arg) };
if res != 0 {
errno_result()
} else {
Ok(())
}
}
/// Sets the current thread to be scheduled using the round robin real time class with `priority`.
pub fn set_rt_round_robin(priority: i32) -> Result<()> {
let sched_param = libc::sched_param {
sched_priority: priority,
};
// Safe because the kernel doesn't modify memory that is accessible to the process here.
let res =
unsafe { libc::pthread_setschedparam(libc::pthread_self(), libc::SCHED_RR, &sched_param) };
if res != 0 {
errno_result()
} else {
Ok(())
}
}