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/*
* SCCS: @(#)mutexes.c 1.4 (98/08/28)
*
* UniSoft Ltd., London, England
*
* (C) Copyright 1996 X/Open Company Limited
*
* All rights reserved. No part of this source code may be reproduced,
* stored in a retrieval system, or transmitted, in any form or by any
* means, electronic, mechanical, photocopying, recording or otherwise,
* except as stated in the end-user licence agreement, without the prior
* permission of the copyright owners.
* A copy of the end-user licence agreement is contained in the file
* Licence which accompanies this distribution.
*
* X/Open and the 'X' symbol are trademarks of X/Open Company Limited in
* the UK and other countries.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
/************************************************************************
SCCS: @(#)mutexes.c 1.4 98/08/28 TETware release 3.3
NAME: mutex definitions and handling functions
PRODUCT: TETware
AUTHOR: Geoff Clare, UniSoft Ltd.
DATE CREATED: July 1996
SYNOPSIS:
mutex_t tet_top_mtx;
mutex_t tet_thrtab_mtx;
mutex_t tet_thrwait_mtx;
mutex_t tet_alarm_mtx;
mutex_t tet_sigalrm_mtx;
void tet_mtx_init(void);
void tet_mtx_destroy(void);
void tet_mtx_lock(void);
void tet_mtx_unlock(void);
DESCRIPTION:
Tet_mtx_init() and tet_mtx_destroy() are used by the TCM to
initialise/destroy/reinitialise all mutexes between test
purposes and before/after the startup and cleanup functions.
Tet_mtx_lock() and tet_mtx_unlock() are used to lock/unlock
all mutexes (e.g. before a fork1()). The locking is done in
a specific order. If any code needs to have more than one
mutex locked at the same time it must lock them in the
same order as tet_mtx_lock().
MODIFICATIONS:
Andrew Dingwall, UniSoft Ltd., February 1998
Use TETware-specific macros to access threads functions and
data items.
Andrew Dingwall, UniSoft Ltd., July 1998
Added support for shared API libraries.
************************************************************************/
#include <stdio.h>
#include "dtmac.h"
#include "dtthr.h"
#include "apilib.h"
tet_mutex_t tet_top_mtx; /* used in tet_api_lock() */
tet_mutex_t tet_thrtab_mtx; /* mutex for thread table */
tet_mutex_t tet_thrwait_mtx; /* used in tet_cln_threads() */
tet_mutex_t tet_sigalrm_mtx; /* used in tet_set_alarm() etc. */
tet_mutex_t tet_alarm_mtx; /* used in tet_set_alarm() etc. */
TET_IMPORT void tet_mtx_init()
{
/* initialise all mutexes */
TET_MUTEX_INIT(&tet_top_mtx);
TET_MUTEX_INIT(&tet_thrtab_mtx);
TET_MUTEX_INIT(&tet_thrwait_mtx);
TET_MUTEX_INIT(&tet_sigalrm_mtx);
TET_MUTEX_INIT(&tet_alarm_mtx);
}
TET_IMPORT void tet_mtx_destroy()
{
/* destroy all mutexes */
TET_MUTEX_DESTROY(&tet_top_mtx);
TET_MUTEX_DESTROY(&tet_thrtab_mtx);
TET_MUTEX_DESTROY(&tet_thrwait_mtx);
TET_MUTEX_DESTROY(&tet_sigalrm_mtx);
TET_MUTEX_DESTROY(&tet_alarm_mtx);
}
void
tet_mtx_lock()
{
/* lock all mutexes IN THE CORRECT ORDER */
TET_MUTEX_LOCK(&tet_top_mtx); /* must be first */
TET_MUTEX_LOCK(&tet_thrtab_mtx);
TET_MUTEX_LOCK(&tet_thrwait_mtx); /* after thrtab_mtx */
TET_MUTEX_LOCK(&tet_sigalrm_mtx);
TET_MUTEX_LOCK(&tet_alarm_mtx); /* after sigalrm_mtx */
}
void
tet_mtx_unlock()
{
/* unlock all mutexes */
TET_MUTEX_UNLOCK(&tet_alarm_mtx);
TET_MUTEX_UNLOCK(&tet_sigalrm_mtx);
TET_MUTEX_UNLOCK(&tet_thrwait_mtx);
TET_MUTEX_UNLOCK(&tet_thrtab_mtx);
TET_MUTEX_UNLOCK(&tet_top_mtx);
}
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