pthread_mutexattr_settype.c

很有名的一款用于组织DDoS的恶意机器人程序。仅供研究学习

/*
 * pthread_mutexattr_settype.c
 *
 * Description:
 * This translation unit implements mutual exclusion (mutex) primitives.
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads-win32 - POSIX Threads Library for Win32
 *      Copyright(C) 1998 John E. Bossom
 *      Copyright(C) 1999,2003 Pthreads-win32 contributors
 * 
 *      Contact Email: [e-mail]
 * 
 *      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:
 *      http://sources.redhat.com/pthreads-win32/contributors.html
 * 
 *      This library is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU Lesser General Public
 *      License as published by the Free Software Foundation; either
 *      version 2 of the License, or (at your option) any later version.
 * 
 *      This library is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *      Lesser General Public License for more details.
 * 
 *      You should have received a copy of the GNU Lesser General Public
 *      License along with this library in the file COPYING.LIB;
 *      if not, write to the Free Software Foundation, Inc.,
 *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

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


int
pthread_mutexattr_settype (pthread_mutexattr_t * attr,
						   int kind)
     /*
      * ------------------------------------------------------
      *
      * DOCPUBLIC
      * The pthread_mutexattr_settype() and
      * pthread_mutexattr_gettype() functions  respectively set and
      * get the mutex type  attribute. This attribute is set in  the
      * type parameter to these functions.
      *
      * PARAMETERS
      *      attr
      * 	     pointer to an instance of pthread_mutexattr_t
      *
      *      type
      * 	     must be one of:
      *
      * 		     PTHREAD_MUTEX_DEFAULT
      *
      * 		     PTHREAD_MUTEX_NORMAL
      *
      * 		     PTHREAD_MUTEX_ERRORCHECK
      *
      * 		     PTHREAD_MUTEX_RECURSIVE
      *
      * DESCRIPTION
      * The pthread_mutexattr_settype() and
      * pthread_mutexattr_gettype() functions  respectively set and
      * get the mutex type  attribute. This attribute is set in  the
      * type  parameter to these functions. The default value of the
      * type  attribute is  PTHREAD_MUTEX_DEFAULT.
      * 
      * The type of mutex is contained in the type  attribute of the
      * mutex attributes. Valid mutex types include:
      *
      * PTHREAD_MUTEX_NORMAL
      * 	 This type of mutex does  not  detect  deadlock.  A
      * 	 thread  attempting  to  relock  this mutex without
      * 	 first unlocking it will  deadlock.  Attempting  to
      * 	 unlock  a  mutex  locked  by  a  different  thread
      * 	 results  in  undefined  behavior.  Attempting	 to
      * 	 unlock  an  unlocked  mutex  results  in undefined
      * 	 behavior.
      * 
      * PTHREAD_MUTEX_ERRORCHECK
      * 	 This type of  mutex  provides	error  checking.  A
      * 	 thread  attempting  to  relock  this mutex without
      * 	 first unlocking it will return with  an  error.  A
      * 	 thread  attempting to unlock a mutex which another
      * 	 thread has locked will return	with  an  error.  A
      * 	 thread attempting to unlock an unlocked mutex will
      * 	 return with an error.
      *
      * PTHREAD_MUTEX_DEFAULT
      * 	 Same as PTHREAD_MUTEX_NORMAL.
      * 
      * PTHREAD_MUTEX_RECURSIVE
      * 	 A thread attempting to relock this  mutex  without
      * 	 first	unlocking  it  will  succeed in locking the
      * 	 mutex. The relocking deadlock which can occur with
      * 	 mutexes of type  PTHREAD_MUTEX_NORMAL cannot occur
      * 	 with this type of mutex. Multiple  locks  of  this
      * 	 mutex	require  the  same  number  of	unlocks  to
      * 	 release  the  mutex  before  another  thread	can
      * 	 acquire the mutex. A thread attempting to unlock a
      * 	 mutex which another thread has locked will  return
      * 	 with  an  error. A thread attempting to  unlock an
      * 	 unlocked mutex will return  with  an  error.  This
      * 	 type  of mutex is only supported for mutexes whose
      * 	 process	shared	       attribute	 is
      * 	 PTHREAD_PROCESS_PRIVATE.
      *
      * RESULTS
      * 	     0		     successfully set attribute,
      * 	     EINVAL	     'attr' or 'type' is invalid,
      *
      * ------------------------------------------------------
      */
{
  int result = 0;

  if ((attr != NULL && *attr != NULL))
    {
      switch (kind)
	{
	case PTHREAD_MUTEX_FAST_NP:
	case PTHREAD_MUTEX_RECURSIVE_NP:
	case PTHREAD_MUTEX_ERRORCHECK_NP:
	  (*attr)->kind = kind;
	  break;
	default:
	  result = EINVAL;
	  break;
	}
    }
  else
    {
      result = EINVAL;
    }
  
  return (result);
}				/* pthread_mutexattr_settype */