graphene/LibOS/shim/src/sys/shim_sched.c

/* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
/* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */

/* Copyright (C) 2014 Stony Brook University
   This file is part of Graphene Library OS.

   Graphene Library OS is free software: you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public License
   as published by the Free Software Foundation, either version 3 of the
   License, or (at your option) any later version.

   Graphene Library OS 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 Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/*
 * shim_sched.c
 *
 * Implementation of system call "sched_yield".
 */

#include <shim_internal.h>
#include <shim_table.h>
#include <api.h>
#include <pal.h>

#include <errno.h>

int shim_do_sched_yield (void)
{
    DkThreadYieldExecution();
    return 0;
}

int shim_do_sched_getaffinity (pid_t pid, size_t len,
                               __kernel_cpu_set_t * user_mask_ptr)
{
    int ncpus = PAL_CB(cpu_info.cpu_num);
    memset(user_mask_ptr, 0, len);
    for (int i = 0 ; i < ncpus ; i++)
        ((uint8_t *) user_mask_ptr)[i / 8] |= 1 << (i % 8);
    return ncpus;
}