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SGI Varsity Update 1998 August
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SGI Varsity Update 1998 August.iso
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dist
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dist6.5
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il_dev.idb
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usr
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include
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il
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ilSemaphore.h.z
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ilSemaphore.h
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C/C++ Source or Header
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1998-07-29
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2KB
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70 lines
#if 0
Copyright (c) 1991 SGI All Rights Reserved
THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF SGI
The copyright notice above does not evidence any
actual or intended publication of such source code,
and is an unpublished work by Silicon Graphics, Inc.
This material contains CONFIDENTIAL INFORMATION that
is the property of Silicon Graphics, Inc. Any use,
duplication or disclosure not specifically authorized
by Silicon Graphics is strictly prohibited.
RESTRICTED RIGHTS LEGEND:
Use, duplication or disclosure by the Government is
subject to restrictions as set forth in subdivision
(c)(1)(ii) of the Rights in Technical Data and Computer
Software clause at DFARS 52.227-7013, and/or in similar
or successor clauses in the FAR, DOD or NASA FAR
Supplement. Unpublished- rights reserved under the
Copyright Laws of the United States. Contractor is
SILICON GRAPHICS, INC., 2011 N. Shoreline Blvd.,
Mountain View, CA 94039-7311
#endif
/*
This class is an interface to the user mode semaphore services.
*/
#ifndef _ilSemaphore_h_
#define _ilSemaphore_h_
#include <il/ilDefs.h>
#ifdef IL_MP
#include <ulocks.h>
#endif
class ilArena;
class ilSemaphore {
public:
// external api: begin
ilSemaphore(int val=1); // create semaphore with initial count of 'val'
~ilSemaphore(); // free semaphore
int set(int val); // re-initialize semaphore to count of 'val'
int inc(); // perform 'v' operation
int dec(int wait=TRUE); // perform 'p' operation
// external api: end
int operator=(int val) { return set(val); }
int operator++() { return inc(); }
int operator--() { return dec(); }
#ifdef DEBUG
int test(); // Debug Only: test semaphore (return value)
#endif
protected:
ilSemaphore(int val, ilArena* ar);
ilSemaphore(int val, usptr_t* h);
#ifdef IL_MP
void init(int val);
usema_t* sem;
usptr_t* handle;
#endif
};
#endif