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TAtomicCountGcc.h
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// @(#)root/thread:$Id$
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// Author: Fons Rademakers 14/11/06
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/*************************************************************************
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* Copyright (C) 1995-2006, Rene Brun and Fons Rademakers. *
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* All rights reserved. *
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* *
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* For the licensing terms see $ROOTSYS/LICENSE. *
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* For the list of contributors see $ROOTSYS/README/CREDITS. *
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*************************************************************************/
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#ifndef ROOT_TAtomicCountGcc
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#define ROOT_TAtomicCountGcc
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//////////////////////////////////////////////////////////////////////////
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// //
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// TAtomicCountGcc //
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// //
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// Class providing atomic operations on a long. Setting, getting, //
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// incrementing and decrementing are atomic, thread safe, operations. //
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// //
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// This implementation uses GNU libstdc++ v3 atomic primitives, see //
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// http://gcc.gnu.org/onlinedocs/porting/Thread-safety.html. //
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// //
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// ATTENTION: Don't use this file directly, it is included by //
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// TAtomicCount.h. //
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// //
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//////////////////////////////////////////////////////////////////////////
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#ifndef ROOT_TAtomicCount
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# error This should be #included only by TAtomicCount.h. Please #include TAtomicCount.h.
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#endif
//ROOT_TAtomicCount
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#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 2) || \
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(defined(__APPLE_CC__) && __APPLE_CC__ > 5000 && !defined(MAC_OS_X_VERSION_10_6))
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#include <bits/atomicity.h>
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#else
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#include <ext/atomicity.h>
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#endif
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#if defined(__GLIBCXX__)
// g++ 3.4+
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using
__gnu_cxx::__atomic_add;
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using
__gnu_cxx::__exchange_and_add;
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#endif
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class
TAtomicCount
{
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private
:
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mutable
_Atomic_word
fCnt
;
// counter
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TAtomicCount
(
const
TAtomicCount
&) =
delete
;
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TAtomicCount
&
operator=
(
const
TAtomicCount
&) =
delete
;
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public
:
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explicit
TAtomicCount
(
Long_t
v
) :
fCnt
(
v
) { }
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void
operator++
() { __atomic_add(&
fCnt
, 1); }
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Long_t
operator--
() {
return
__exchange_and_add(&
fCnt
, -1) - 1; }
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operator
long()
const
{
return
__exchange_and_add(&
fCnt
, 0); }
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void
Set
(
Long_t
v
) {
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fCnt
=
v
;
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#ifdef _GLIBCXX_WRITE_MEM_BARRIER
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#if !(defined(__INTEL_COMPILER) && defined(__ia64__))
//ICC doesn't support inline asm on IA-64
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_GLIBCXX_WRITE_MEM_BARRIER;
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#endif
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#endif
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}
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Long_t
Get
()
const
{
return
__exchange_and_add(&
fCnt
, 0); }
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};
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#endif
Long_t
long Long_t
Definition
RtypesCore.h:54
TAtomicCount
Definition
TAtomicCount.h:67
TAtomicCount::Get
Long_t Get() const
Definition
TAtomicCountGcc.h:69
TAtomicCount::operator++
void operator++()
Definition
TAtomicCountGcc.h:58
TAtomicCount::TAtomicCount
TAtomicCount(const TAtomicCount &)=delete
TAtomicCount::fCnt
Long_t fCnt
Definition
TAtomicCount.h:69
TAtomicCount::fCnt
_Atomic_word fCnt
Definition
TAtomicCountGcc.h:51
TAtomicCount::TAtomicCount
TAtomicCount(Long_t v)
Definition
TAtomicCountGcc.h:57
TAtomicCount::operator--
Long_t operator--()
Definition
TAtomicCountGcc.h:59
TAtomicCount::operator=
TAtomicCount & operator=(const TAtomicCount &)=delete
TAtomicCount::Set
void Set(Long_t v)
Definition
TAtomicCountGcc.h:61
v
@ v
Definition
rootcling_impl.cxx:3687
core
thread
inc
TAtomicCountGcc.h
ROOT master - Reference Guide Generated on Wed Aug 14 2024 14:53:43 (GVA Time) using Doxygen 1.9.8