pthread_getspecific.c

/*
 * pthread_getspecific.c
 *
 * Description:
 * POSIX thread functions which implement thread-specific data (TSD).
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads4w - POSIX Threads for Windows
 *      Copyright 1998 John E. Bossom
 *      Copyright 1999-2018, Pthreads4w contributors
 *
 *      Homepage: https://sourceforge.net/projects/pthreads4w/
 *
 *      The current list of contributors is contained
 *      in the file CONTRIBUTORS included with the source
 *      code distribution. The list can also be seen at the
 *      following World Wide Web location:
 *
 *      https://sourceforge.net/p/pthreads4w/wiki/Contributors/
 *
 * 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.
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include "pthread.h"
#include "implement.h"


void *
pthread_getspecific (pthread_key_t key)
     /*
      * ------------------------------------------------------
      * DOCPUBLIC
      *      This function returns the current value of key in the
      *      calling thread. If no value has been set for 'key' in 
      *      the thread, NULL is returned.
      *
      * PARAMETERS
      *      key
      *              an instance of pthread_key_t
      *
      *
      * DESCRIPTION
      *      This function returns the current value of key in the
      *      calling thread. If no value has been set for 'key' in 
      *      the thread, NULL is returned.
      *
      * RESULTS
      *              key value or NULL on failure
      *
      * ------------------------------------------------------
      */
{
  void * ptr;

  if (key == NULL)
    {
      ptr = NULL;
    }
  else
    {
      int lasterror = GetLastError ();
#if defined(RETAIN_WSALASTERROR)
      int lastWSAerror = WSAGetLastError ();
#endif
      ptr = TlsGetValue (key->key);

      SetLastError (lasterror);
#if defined(RETAIN_WSALASTERROR)
      WSASetLastError (lastWSAerror);
#endif
    }

  return ptr;
}