Posix_system_utils.cpp

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Author : Stuart Morgan
Date : 2019-08-14 12:25:12
Hash : 9d737966
Message : Standardize copyright notices to project style For all "ANGLE Project" copyrights, standardize to the format specified by the style guide. Changes: - "Copyright (c)" and "Copyright(c)" changed to just "Copyright". - Removed the second half of date ranges ("Y1Y1-Y2Y2"->"Y1Y1"). - Fixed a small number of files that had no copyright date using the initial commit year from the version control history. - Fixed one instance of copyright being "The ANGLE Project" rather than "The ANGLE Project Authors" These changes are applied both to the copyright of source file, and where applicable to copyright statements that are generated by templates. BUG=angleproject:3811 Change-Id: I973dd65e4ef9deeba232d5be74c768256a0eb2e5 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1754397 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>

util/posix/Posix_system_utils.cpp

//
// Copyright 2015 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// Posix_system_utils.cpp: Implementation of OS-specific functions for Posix systems

#include "util/system_utils.h"

#include <sched.h>
#include <time.h>
#include <unistd.h>

#if !defined(ANGLE_PLATFORM_FUCHSIA)
#    include <dlfcn.h>
#    include <sys/resource.h>
#endif

#include "common/platform.h"

namespace angle
{

void Sleep(unsigned int milliseconds)
{
    // On Windows Sleep(0) yields while it isn't guaranteed by Posix's sleep
    // so we replicate Windows' behavior with an explicit yield.
    if (milliseconds == 0)
    {
        sched_yield();
    }
    else
    {
        timespec sleepTime = {
            .tv_sec  = milliseconds / 1000,
            .tv_nsec = (milliseconds % 1000) * 1000000,
        };

        nanosleep(&sleepTime, nullptr);
    }
}

void SetLowPriorityProcess()
{
#if !defined(ANGLE_PLATFORM_FUCHSIA)
    setpriority(PRIO_PROCESS, getpid(), 10);
#endif
}

void WriteDebugMessage(const char *format, ...)
{
    va_list vararg;
    va_start(vararg, format);
    vfprintf(stderr, format, vararg);
    va_end(vararg);
}

bool StabilizeCPUForBenchmarking()
{
#if !defined(ANGLE_PLATFORM_FUCHSIA)
    bool success = true;
    errno        = 0;
    setpriority(PRIO_PROCESS, getpid(), -20);
    if (errno)
    {
        // A friendly warning in case the test was run without appropriate permission.
        perror(
            "Warning: setpriority failed in StabilizeCPUForBenchmarking. Process will retain "
            "default priority");
        success = false;
    }
#    if ANGLE_PLATFORM_LINUX
    cpu_set_t affinity;
    CPU_SET(0, &affinity);
    errno = 0;
    if (sched_setaffinity(getpid(), sizeof(affinity), &affinity))
    {
        perror(
            "Warning: sched_setaffinity failed in StabilizeCPUForBenchmarking. Process will retain "
            "default affinity");
        success = false;
    }
#    else
    // TODO(jmadill): Implement for non-linux. http://anglebug.com/2923
#    endif

    return success;
#else  // defined(ANGLE_PLATFORM_FUCHSIA)
    return false;
#endif
}
}  // namespace angle

kc3-lang/angle/util/posix/Posix_system_utils.cpp

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kc3-lang/angle /util/posix/Posix_system_utils.cpp