75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
/*
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*******************************************************************************
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* *
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* COPYRIGHT: *
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* (C) Copyright Taligent, Inc., 1997 *
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* (C) Copyright International Business Machines Corporation, 1997-1999 *
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* Licensed Material - Program-Property of IBM - All Rights Reserved. *
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* US Government Users Restricted Rights - Use, duplication, or disclosure *
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* restricted by GSA ADP Schedule Contract with IBM Corp. *
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* *
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*******************************************************************************
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*
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* File UMUTEX.H
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*
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* Modification History:
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*
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* Date Name Description
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* 04/02/97 aliu Creation.
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* 04/07/99 srl rewrite - C interface, multiple mutices
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* 05/13/99 stephen Changed to umutex (from cmutex)
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********************************************************************************
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*/
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#ifndef UMUTEX_H
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#define UMUTEX_H
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#include "utypes.h"
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#ifndef XP_CPLUSPLUS
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typedef void * Mutex;
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#endif
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/*
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* Code within this library which accesses protected data should
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* instantiate a Mutex object while doing so. Notice that there is
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* only one coarse-grained lock which applies to this entire library,
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* so keep locking short and sweet.
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*
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* For example:
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*
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* void Function(int arg1, int arg2)
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* {
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* static Object* foo; // Shared read-write object
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* Mutex mutex;
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* foo->Method();
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* // When 'mutex' goes out of scope and gets destroyed here
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* // the lock is released
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* }
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*
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* Note: Do NOT use the form 'Mutex mutex();' as that merely
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* forward-declares a function returning a Mutex. This is a common
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* mistake which silently slips through the compiler!! */
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/* Mutex data type. */
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typedef void *UMTX;
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/* Lock a mutex. Pass in NULL if you want the (ick) Single Global
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Mutex. */
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U_CAPI void U_EXPORT2 umtx_lock ( UMTX* mutex );
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/* Unlock a mutex. Pass in NULL if you want the single global
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mutex. */
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U_CAPI void U_EXPORT2 umtx_unlock ( UMTX* mutex );
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/* Initialize a mutex. Use it this way:
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umtx_init( &aMutex ); */
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U_CAPI void U_EXPORT2 umtx_init ( UMTX* mutex );
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#endif /*_CMUTEX*/
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/*eof*/
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