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/* testthr.h: MULTI-THREADED TEST INTERFACE
 *
 * $Id: //info.ravenbrook.com/project/mps/custom/cet/main/code/testthr.h#3 $
 * Copyright (c) 2014-2016 Ravenbrook Limited.  See end of file for license.
 *
 * .purpose: Simple interface to threads that makes it possible to
 * write test cases that are portable between Windows (using the
 * implementation in testthrw3.c) and Unix (using the implementation
 * in testthrix.c). See <design/testthr/>.
 */

#ifndef testthr_h
#define testthr_h

#include "mpstd.h"


/* testthr_routine_t -- type of thread routines
 *
 * Use the pthread type here and convert back and forth in the Windows
 * implementation.
 */
typedef void *(*testthr_routine_t)(void *);


/* testthr_t -- type of thread identifiers
 *
 * It is necessary to define it here (even though it requires some
 * #ifdefs) so that clients can allocate storage for them.
 */

#if defined(MPS_OS_W3)

#include "mpswin.h"

/* On Windows, a thread is identified by a HANDLE.
 * <http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751.aspx>
 * But use a structure so that the thread has somewhere to store its
 * result for use by testthr_join.
 */
typedef struct testthr_t {
  HANDLE handle;
  testthr_routine_t start;
  void *arg;                  /* argument to pass to start */
  void *result;               /* result returned from start */
} testthr_t;

#elif defined(MPS_OS_FR) || defined(MPS_OS_LI) || defined(MPS_OS_XC)

#include <pthread.h>

/* In pthreads, a thread is identified by a pthread_t, which is
 * allowed "to be defined as a structure" [IEEE Std 1003.1, sys/types.h]
 * <http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_types.h.html>
 */
typedef pthread_t testthr_t;

#else
#error "Unknown platform: can't determine a type for testthr_t."
#endif


/* testthr_create -- create a thread
 *
 * Store the identifier of the newly created thread in *thread_o, and
 * call start, passing arg as the single parameter.
 */

void testthr_create(testthr_t *thread_o, testthr_routine_t start, void *arg);


/* testthr_join -- wait for a thread to complete 
 *
 * Suspend execution of the calling thread until the target thread
 * terminates (if necessary), and if result_o is non-NULL, update
 * *result_o with the return value of the thread's start.
 */

void testthr_join(testthr_t *thread, void **result_o);

#endif /* testthr_h */


/* C. COPYRIGHT AND LICENSE
 *
 * Copyright (C) 2014-2016 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.
 */