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Coin / src / threads / condvar_win32.icc

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Lars J. Aas 92263e4 
Marius Kintel 3ba6b41 




























Lars J. Aas 92263e4 






















Lars J. Aas 02ec13b 

Lars J. Aas 92263e4 








Lars J. Aas 02ec13b 

Lars J. Aas 92263e4 
















Lars J. Aas 02ec13b 
Lars J. Aas 92263e4 






Lars J. Aas 02ec13b 
Lars J. Aas 92263e4 










































Lars J. Aas 02ec13b 
Lars J. Aas 92263e4 















































/**************************************************************************\
 * Copyright (c) Kongsberg Oil & Gas Technologies AS
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\**************************************************************************/

/* This file should only be included from condvar.c */

#include "glue/win32api.h"

#define EVENT_SIGNAL 0
#define EVENT_BROADCAST 1

/*
 * This implementation is based on the SetEvent (3.2) solution decribed at
 * http://www.cs.wustl.edu/~schmidt/win32-cv-1.html.
 */

static int
internal_condvar_struct_init(cc_condvar * condvar_struct)
{
  /* auto-reset, initially is non-signaled */
  condvar_struct->w32thread.eventhandle[EVENT_SIGNAL] =
    CreateEvent(NULL, FALSE, FALSE, NULL);
  if (condvar_struct->w32thread.eventhandle[EVENT_SIGNAL] == NULL) {
    if (COIN_DEBUG) {
      cc_win32_print_error("internal_condvar_struct_init",
                           "CreateEvent(NULL,FALSE,FALSE,NULL)",
                           GetLastError());
    }
    return CC_ERROR;
  }
  /* auto-reset, initially is non-signaled */
  condvar_struct->w32thread.eventhandle[EVENT_BROADCAST] =
    CreateEvent(NULL, TRUE, FALSE, NULL);
  if (condvar_struct->w32thread.eventhandle[EVENT_BROADCAST] == NULL) {
    if (COIN_DEBUG) {
      cc_win32_print_error("internal_condvar_struct_init",
                           "CreateEvent(NULL,TRUE,FALSE,NULL)",
                           GetLastError());
    }
    return CC_ERROR;
  }
  InitializeCriticalSection(&condvar_struct->w32thread.waiters_count_lock);
  condvar_struct->w32thread.waiters_count = 0;
  return CC_OK;
}

static int
internal_condvar_struct_clean(cc_condvar * condvar_struct)
{
  BOOL status;
  int ret = CC_OK;
  status = CloseHandle(condvar_struct->w32thread.eventhandle[EVENT_SIGNAL]);
  if (status == FALSE) {
    if (COIN_DEBUG) {
      cc_win32_print_error("internal_condvar_struct_clean",
                           "CloseHandle()", GetLastError());
    }
    ret = CC_ERROR;
  }
  status = CloseHandle(condvar_struct->w32thread.eventhandle[EVENT_BROADCAST]);
  if (status == FALSE) {
    if (COIN_DEBUG) {
      cc_win32_print_error("internal_condvar_struct_clean",
                           "CloseHandle()", GetLastError());
    }
    ret = CC_ERROR;
  }
  DeleteCriticalSection(&condvar_struct->w32thread.waiters_count_lock);
  return ret;
}

static int
internal_condvar_wait_common(cc_condvar * condvar, cc_mutex * mutex, DWORD period)
{
  DWORD result;
  int last_waiter;

  EnterCriticalSection(&condvar->w32thread.waiters_count_lock);
  condvar->w32thread.waiters_count++;
  LeaveCriticalSection(&condvar->w32thread.waiters_count_lock);

  /* It's ok to release <mutex> here since Win32 manual-reset events
   * maintain state when used with <SetEvent>.  This avoids the "lost
   * wakeup" bug... */
  cc_mutex_unlock(mutex);

  result = WaitForMultipleObjects(2, condvar->w32thread.eventhandle, FALSE, period);

  EnterCriticalSection(&condvar->w32thread.waiters_count_lock);
  condvar->w32thread.waiters_count--;
  last_waiter =
    result == WAIT_OBJECT_0 + EVENT_BROADCAST &&
    condvar->w32thread.waiters_count == 0;
  LeaveCriticalSection(&condvar->w32thread.waiters_count_lock);
  /* Some thread called wake_all */
  if (last_waiter) {
    /* We're the last waiter to be notified or to stop waiting, so
     * reset the manual event. */
    ResetEvent(condvar->w32thread.eventhandle[EVENT_BROADCAST]);
  }

  /* relock the mutex before returning */
  cc_mutex_lock(mutex);

  if (result == WAIT_FAILED) {
    if (COIN_DEBUG) {
      cc_win32_print_error("internal_condvar_wait_common",
                           "WaitForMultipleObjects()", GetLastError());
    }
    return CC_ERROR;
  }

  return result == WAIT_TIMEOUT ? CC_TIMEOUT : CC_OK;
}

static int
internal_condvar_wait(cc_condvar * condvar, cc_mutex * mutex)
{
  return internal_condvar_wait_common(condvar, mutex, INFINITE);
}

static int
internal_condvar_timed_wait(cc_condvar * condvar, cc_mutex * mutex, cc_time period)
{
  return internal_condvar_wait_common(condvar, mutex, (DWORD)floor(period*1000.0f));
}

static int
internal_condvar_wake_one(cc_condvar * condvar)
{
  int have_waiters;
  EnterCriticalSection(&condvar->w32thread.waiters_count_lock);
  have_waiters = condvar->w32thread.waiters_count > 0;
  LeaveCriticalSection(&condvar->w32thread.waiters_count_lock);

  if (have_waiters) {
    SetEvent(condvar->w32thread.eventhandle[EVENT_SIGNAL]);
  }
  return CC_OK;
}

static int
internal_condvar_wake_all(cc_condvar * condvar)
{
  int have_waiters;
  EnterCriticalSection(&condvar->w32thread.waiters_count_lock);
  have_waiters = condvar->w32thread.waiters_count > 0;
  LeaveCriticalSection(&condvar->w32thread.waiters_count_lock);

  if (have_waiters) {
    SetEvent(condvar->w32thread.eventhandle[EVENT_BROADCAST]);
  }
  return CC_OK;
}

#undef EVENT_SIGNAL
#undef EVENT_BROADCAST