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/* pthreadext.h: POSIX THREAD EXTENSIONS
 *
 *  $Id: //info.ravenbrook.com/project/mps/custom/cet/main/code/pthrdext.h#2 $
 *  Copyright (c) 2001-2016 Ravenbrook Limited.  See end of file for license.
 *
 * .readership: MM developers.
 *
 *  .purpose: Provides extension to Pthreads.
 */

#ifndef pthreadext_h
#define pthreadext_h

#include <signal.h>

#include "mpm.h"


#define PThreadextSig ((Sig)0x519B286E) /* SIGnature PTHReadExt */


/* PThreadext -- extension datatype  */

typedef struct PThreadextStruct *PThreadext;


/* PThreadextStruct -- structure definition
 *
 * Should be embedded in a client structure
 */

typedef struct PThreadextStruct {
  Sig sig;                         /* <design/sig/> */
  pthread_t id;                    /* Thread ID */
  MutatorContext context;          /* context if suspended */
  RingStruct threadRing;           /* ring of suspended threads */
  RingStruct idRing;               /* duplicate suspensions for id */
} PThreadextStruct;



/*  PThreadextCheck -- Check a pthreadext */

extern Bool PThreadextCheck(PThreadext pthreadext);


/*  PThreadextInit -- Initialize a pthreadext */

extern void PThreadextInit(PThreadext pthreadext, pthread_t id);


/*  PThreadextFinish -- Finish a pthreadext */

extern void PThreadextFinish(PThreadext pthreadext);


/*  PThreadextSuspend -- Suspend a pthreadext and return its context. */

extern Res PThreadextSuspend(PThreadext pthreadext,
                             MutatorContext *contextReturn);


/*  PThreadextResume --  Resume a suspended pthreadext */

extern Res PThreadextResume(PThreadext pthreadext);


#endif /* pthreadext_h */


/* C. COPYRIGHT AND LICENSE
 *
 * Copyright (C) 2001-2016 Ravenbrook Limited <http://www.ravenbrook.com/>.
 * All rights reserved.  This is an open source license.  Contact
 * Ravenbrook for commercial licensing options.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * 2. 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.
 * 
 * 3. Redistributions in any form must be accompanied by information on how
 * to obtain complete source code for this software and any accompanying
 * software that uses this software.  The source code must either be
 * included in the distribution or be available for no more than the cost
 * of distribution plus a nominal fee, and must be freely redistributable
 * under reasonable conditions.  For an executable file, complete source
 * code means the source code for all modules it contains. It does not
 * include source code for modules or files that typically accompany the
 * major components of the operating system on which the executable file
 * runs.
 * 
 * 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, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS AND 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.
 */