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plurals

PO
primarykey
Id
449823
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2009-01-16T08:20:33.037
FavoriteCount
0
LastActivityDate
2012-08-18T15:27:38.987
LastEditDate
2017-05-23T12:17:47.357
LastEditorUserId
-1
OwnerUserId
14065
ParentId
449436
PostTypeId
2
Score
34
ViewCount
0
LastEditorDisplayName
Martin York
text
Body
In C++11 it is thread safe: <blockquote> §6.7 [stmt.dcl] p4 If control enters the declaration concurrently while the variable is being initialized, the concurrent execution shall wait for completion of the initialization. </blockquote> In C++03: <ul> <li>Under g++ it is thread safe. But this is because g++ explicitly adds code to guarantee it.</li> </ul> One problem is that if you have two singletons and they try and use each other during construction and destruction. Read this: <a href="https://stackoverflow.com/questions/335369/finding-c-static-initialization-order-problems#335746">Finding C++ static initialization order problems</a> A variation on this problem is if the singleton is accessed from the destructor of a global variable. In this situation the singleton has definitely been destroyed, but the get method will still return a reference to the destroyed object. There are ways around this but they are messy and not worth doing. Just don't access a singleton from the destructor of a global variable. A Safer definition but ugly: I am sure you can add some appropriate macros to tidy this up <pre><code>SomeBaseClass &SomeClass::GetInstance() { #ifdef _WIN32 Start Critical Section Here #elif defined(__GNUC__) && (__GNUC__ > 3) // You are OK #else #error Add Critical Section for your platform #endif static SomeClass instance; #ifdef _WIN32 END Critical Section Here #endif return instance; } </code></pre>
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1. USMartin York
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