XRootD
XrdSysXSLock.hh
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#ifndef __SYS_XSLOCK_HH__
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#define __SYS_XSLOCK_HH__
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/******************************************************************************/
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/* */
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/* X r d S y s X S L o c k . h h */
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/* */
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/* (c) 2003 by the Board of Trustees of the Leland Stanford, Jr., University */
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/* All Rights Reserved */
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/* Produced by Andrew Hanushevsky for Stanford University under contract */
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/* DE-AC02-76-SFO0515 with the Department of Energy */
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/* */
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/* This file is part of the XRootD software suite. */
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/* */
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/* XRootD is free software: you can redistribute it and/or modify it under */
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/* the terms of the GNU Lesser General Public License as published by the */
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/* Free Software Foundation, either version 3 of the License, or (at your */
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/* option) any later version. */
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/* */
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/* XRootD is distributed in the hope that it will be useful, but WITHOUT */
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/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
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/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */
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/* License for more details. */
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/* */
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/* You should have received a copy of the GNU Lesser General Public License */
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/* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */
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/* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */
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/* */
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/* The copyright holder's institutional names and contributor's names may not */
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/* be used to endorse or promote products derived from this software without */
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/* specific prior written permission of the institution or contributor. */
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/******************************************************************************/
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#include <cerrno>
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#include "
XrdSys/XrdSysPthread.hh
"
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// These are valid usage options
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//
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enum
XrdSysXS_Type
{
xs_None
= 0,
xs_Shared
= 1,
xs_Exclusive
= 2};
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// This class implements the shared lock. Any number of readers are allowed
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// by requesting a shared lock. Only one exclusive writer is allowed by
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// requesting an exclusive lock. Up/downgrading is not supported.
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//
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class
XrdSysXSLock
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{
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public
:
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void
Lock
(
const
XrdSysXS_Type
usage
);
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void
UnLock
(
const
XrdSysXS_Type
usage
=
xs_None
);
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XrdSysXSLock
() : cur_usage(
xs_None
), cur_count(0), exc_wait(0),
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shr_wait(0), toggle(0), WantShr(0), WantExc(0) {}
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~XrdSysXSLock
();
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private
:
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XrdSysXS_Type
cur_usage;
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int
cur_count;
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int
exc_wait;
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int
shr_wait;
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int
toggle;
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XrdSysMutex
LockContext;
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XrdSysSemaphore
WantShr;
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XrdSysSemaphore
WantExc;
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};
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#endif
usage
void usage()
Definition:
XrdClReplay.cc:1072
XrdSysPthread.hh
XrdSysXS_Type
XrdSysXS_Type
Definition:
XrdSysXSLock.hh:38
xs_Exclusive
@ xs_Exclusive
Definition:
XrdSysXSLock.hh:38
xs_None
@ xs_None
Definition:
XrdSysXSLock.hh:38
xs_Shared
@ xs_Shared
Definition:
XrdSysXSLock.hh:38
XrdSysMutex
Definition:
XrdSysPthread.hh:165
XrdSysSemaphore
Definition:
XrdSysPthread.hh:494
XrdSysXSLock
Definition:
XrdSysXSLock.hh:45
XrdSysXSLock::Lock
void Lock(const XrdSysXS_Type usage)
Definition:
XrdSysXSLock.cc:55
XrdSysXSLock::UnLock
void UnLock(const XrdSysXS_Type usage=xs_None)
Definition:
XrdSysXSLock.cc:95
XrdSysXSLock::XrdSysXSLock
XrdSysXSLock()
Definition:
XrdSysXSLock.hh:52
XrdSysXSLock::~XrdSysXSLock
~XrdSysXSLock()
Definition:
XrdSysXSLock.cc:38
XrdSys
XrdSysXSLock.hh
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