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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Author: cody kochmann
# @Date:   2017-10-18

import os

''' 
helper functions to pin the current process to a single core and change the 
niceness of the process. These are necessary instead of just calling functions
from the 'os' module because these can be called without needing to worry about
whether or not the current system or python version can run with these calls.
'''

def pin_to_cpu(core_number):
    ''' pin the current process to a specific cpu to avoid dumping L1 cache'''
    assert type(core_number) == int, 'pin_to_cpu needs an int as the argument'
    # only run if os has sched_setaffinity and getpid available
    try:
        os.sched_setaffinity(os.getpid(), (core_number,))
    except:
        # just attempt this, it wont work on EVERY system in existence
        pass


def renice(new_niceness):
    ''' renice the current process calling this function to the new input '''
    assert type(new_niceness) == int, 'renice needs an int as its argument'
    # maximum constraints
    if new_niceness > 20:
        new_niceness = 20
    elif new_niceness < -20:
        new_niceness = -20

    try:
        os.nice(new_niceness)
    except:
        # just attempt this, it wont work on EVERY system in existence
        pass