detect-wakeup.c

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/* Copyright libuv project contributors. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
 
#include "uv.h"
#include "internal.h"
#include "winapi.h"
 
static void uv__register_system_resume_callback(void);
 
void uv__init_detect_system_wakeup(void) {
  /* Try registering system power event callback. This is the cleanest
   * method, but it will only work on Win8 and above.
   */
  uv__register_system_resume_callback();
}
 
static ULONG CALLBACK uv__system_resume_callback(PVOID Context,
                                                 ULONG Type,
                                                 PVOID Setting) {
  if (Type == PBT_APMRESUMESUSPEND || Type == PBT_APMRESUMEAUTOMATIC)
    uv__wake_all_loops();
 
  return 0;
}
 
static void uv__register_system_resume_callback(void) {
  _DEVICE_NOTIFY_SUBSCRIBE_PARAMETERS recipient;
  _HPOWERNOTIFY registration_handle;
 
  if (pPowerRegisterSuspendResumeNotification == NULL)
    return;
 
  recipient.Callback = uv__system_resume_callback;
  recipient.Context = NULL;
  (*pPowerRegisterSuspendResumeNotification)(DEVICE_NOTIFY_CALLBACK,
                                             &recipient,
                                             &registration_handle);
}