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Coin / src / threads / mutex_win32mutex.icc

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/**************************************************************************\
 * Copyright (c) Kongsberg Oil & Gas Technologies AS
 * All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
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 * notice, this list of conditions and the following disclaimer in the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
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/* this file should only be included from mutex.c */

#include "glue/win32api.h"

/* FIXME: some of the cases where we are robust and catch and return
   error codes should probably be replaced by asserts.  Should audit
   the code versus the Win32 API documentation and fix.  20030604 mortene. */

static int
win32_mutex_struct_init(cc_mutex * mutex_struct)
{
  mutex_struct->w32thread.mutexhandle = CreateMutex(NULL, FALSE, NULL);
  if (mutex_struct->w32thread.mutexhandle == NULL) {
    if (COIN_DEBUG) {
      cc_win32_print_error("win32_mutex_struct_init",
                           "CreateMutex()", GetLastError());
    }
    return CC_ERROR;
  }
  return CC_OK;
}

static int
win32_mutex_struct_clean(cc_mutex * mutex_struct)
{
  BOOL status = CloseHandle(mutex_struct->w32thread.mutexhandle);
  if (status == FALSE) {
    if (COIN_DEBUG) {
      cc_win32_print_error("win32_mutex_struct_clean",
                           "CloseHandle()", GetLastError());
    }
    return CC_ERROR;
  }
  return CC_OK;
}

static int
win32_mutex_lock(cc_mutex * mutex)
{
  DWORD status;
  status = WaitForSingleObject(mutex->w32thread.mutexhandle, INFINITE);
  if (status == WAIT_FAILED) {
    if (COIN_DEBUG) {
      cc_win32_print_error("win32_mutex_lock",
                           "WaitSingleObject()", GetLastError());
    }
    return CC_ERROR;
  }
  return CC_OK;
}

static int
win32_mutex_try_lock(cc_mutex * mutex)
{
  DWORD status;
  status = WaitForSingleObject(mutex->w32thread.mutexhandle, 0);
  if (status == WAIT_TIMEOUT)
    return CC_BUSY;
  else if ((status == WAIT_OBJECT_0) || (status == WAIT_ABANDONED))
    return CC_OK;

  /* if we get here there was an error */
  if (COIN_DEBUG) {
    cc_win32_print_error("win32_mutex_try_lock",
                         "WaitSingleObject()", GetLastError());
  }
  return CC_ERROR;
}

static int
win32_mutex_unlock(cc_mutex * mutex)
{
  BOOL status = ReleaseMutex(mutex->w32thread.mutexhandle);
  if (status == FALSE) {
    if (COIN_DEBUG) {
      cc_win32_print_error("win32_mutex_unlock",
                           "ReleaseMutex()", GetLastError());
    }
    return CC_ERROR;
  }
  return CC_OK;
}