/**

 * WinPR: Windows Portable Runtime

 * Synchronization Functions

 *

 * Copyright 2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include <winpr/config.h>

#include <winpr/platform.h>

#include <winpr/windows.h>

#include <winpr/synch.h>

#include "../log.h"

#include "../thread/apc.h"

#include "../thread/thread.h"

#include "../synch/pollset.h"

#define TAG WINPR_TAG("synch.sleep")

#ifndef _WIN32

#include <time.h>

WINPR_PRAGMA_DIAG_PUSH

WINPR_PRAGMA_DIAG_IGNORED_RESERVED_ID_MACRO

#ifdef WINPR_HAVE_UNISTD_H

#ifndef _XOPEN_SOURCE

#define _XOPEN_SOURCE 500

#endif

#include <unistd.h>

#endif

WINPR_PRAGMA_DIAG_POP

VOID Sleep(DWORD dwMilliseconds)

{

  usleep(dwMilliseconds * 1000);

}

DWORD SleepEx(DWORD dwMilliseconds, BOOL bAlertable)

{

  WINPR_THREAD* thread = winpr_GetCurrentThread();

  WINPR_POLL_SET pollset;

  int status = 0;

  DWORD ret = WAIT_FAILED;

  BOOL autoSignalled = 0;

  if (thread)

  {

    /* treat re-entrancy if a completion is calling us */

    if (thread->apc.treatingCompletions)

      bAlertable = FALSE;

  }

  else

  {

    /* called from a non WinPR thread */

    bAlertable = FALSE;

  }

  if (!bAlertable || !thread->apc.length)

  {

    usleep(dwMilliseconds * 1000);

    return 0;

  }

  if (!pollset_init(&pollset, thread->apc.length))

  {

    WLog_ERR(TAG, "unable to initialize pollset");

    return WAIT_FAILED;

  }

  if (!apc_collectFds(thread, &pollset, &autoSignalled))

  {

    WLog_ERR(TAG, "unable to APC file descriptors");

    goto out;

  }

  if (!autoSignalled)

  {

    /* we poll and wait only if no APC member is ready */

    status = pollset_poll(&pollset, dwMilliseconds);

    if (status < 0)

    {

      WLog_ERR(TAG, "polling of apc fds failed");

      goto out;

    }

  }

  if (apc_executeCompletions(thread, &pollset, 0))

  {

    ret = WAIT_IO_COMPLETION;

  }

  else

  {

    /* according to the spec return value is 0 see

     * https://docs.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-sleepex*/

    ret = 0;

  }

out:

  pollset_uninit(&pollset);

  return ret;

}

#endif

VOID USleep(DWORD dwMicroseconds)

{

#ifndef _WIN32

  usleep(dwMicroseconds);

#else

  static LARGE_INTEGER freq = { 0 };

  LARGE_INTEGER t1 = { 0 };

  LARGE_INTEGER t2 = { 0 };

  QueryPerformanceCounter(&t1);

  if (freq.QuadPart == 0)

  {

    QueryPerformanceFrequency(&freq);

  }

  // in order to save cpu cyles we use Sleep() for the large share ...

  if (dwMicroseconds >= 1000)

  {

    Sleep(dwMicroseconds / 1000);

  }

  // ... and busy loop until all the requested micro seconds have passed

  do

  {

    QueryPerformanceCounter(&t2);

  } while (((t2.QuadPart - t1.QuadPart) * 1000000) / freq.QuadPart < dwMicroseconds);

#endif

}