pthread_kill.c

/*
 * pthread_kill.c
 *
 * Description:
 * This translation unit implements the pthread_kill routine.
 *
 * --------------------------------------------------------------------------
 *
 *      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"

/*
 * Not needed yet, but defining it should indicate clashes with build target
 * environment that should be fixed.
 */
#if !defined(WINCE)
#  include <signal.h>
#endif

int
pthread_kill (pthread_t thread, int sig)
     /*
      * ------------------------------------------------------
      * DOCPUBLIC
      *      This function requests that a signal be delivered to the
      *      specified thread. If sig is zero, error checking is
      *      performed but no signal is actually sent such that this
      *      function can be used to check for a valid thread ID.
      *
      * PARAMETERS
      *      thread  reference to an instances of pthread_t
      *      sig     signal. Currently only a value of 0 is supported.
      *
      *
      * DESCRIPTION
      *      This function requests that a signal be delivered to the
      *      specified thread. If sig is zero, error checking is
      *      performed but no signal is actually sent such that this
      *      function can be used to check for a valid thread ID.
      *
      * RESULTS
      *              ESRCH           the thread is not a valid thread ID,
      *              EINVAL          the value of the signal is invalid
      *                              or unsupported.
      *              0               the signal was successfully sent.
      *
      * ------------------------------------------------------
      */
{
  int result = 0;

  if (0 != sig)
    {
      /*
       * Currently does not support any signals.
       */
      result = EINVAL;
    }
  else
    {
      __ptw32_mcs_local_node_t node;
      __ptw32_thread_t * tp;

      __ptw32_mcs_lock_acquire(&__ptw32_thread_reuse_lock, &node);

      tp = (__ptw32_thread_t *) thread.p;

      if (NULL == tp
	  || thread.x != tp->ptHandle.x
	  || tp->state < PThreadStateRunning)
	{
	  result = ESRCH;
	}

      __ptw32_mcs_lock_release(&node);
    }

  return result;

}				/* pthread_kill */