Do I need to protect access to a Boost MultiIndex's index (the index itself) by a lock?

Multi tool use
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Assuming I have a boost::multi_index_container and want to access an index of it



  boost::multi_index_container< ... > bmi;
// lock here?
auto &index = boost::multi_index::get<0>(bmi); // <-- does this call need to be protected by a lock?

// or is it sufficient to lock here?

// access the index (need to have the lock here)


When multiple processes / threads access a multi_indesx_container, I need to use mutexes (or something of the sort). But do I need to protect getting the index itself, too?
I guess not, but could not find a guarantee in the docs.










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  • Are you adding or removing items in any of your threads?

    – drescherjm
    Dec 30 '18 at 23:40













  • sure, other threads will modifiy the index. (but getting the index itself... will the get() call return different objects if the multi_index gets modified?)

    – C. Duelli
    Dec 30 '18 at 23:41


















0















Assuming I have a boost::multi_index_container and want to access an index of it



  boost::multi_index_container< ... > bmi;
// lock here?
auto &index = boost::multi_index::get<0>(bmi); // <-- does this call need to be protected by a lock?

// or is it sufficient to lock here?

// access the index (need to have the lock here)


When multiple processes / threads access a multi_indesx_container, I need to use mutexes (or something of the sort). But do I need to protect getting the index itself, too?
I guess not, but could not find a guarantee in the docs.










share|improve this question

























  • Are you adding or removing items in any of your threads?

    – drescherjm
    Dec 30 '18 at 23:40













  • sure, other threads will modifiy the index. (but getting the index itself... will the get() call return different objects if the multi_index gets modified?)

    – C. Duelli
    Dec 30 '18 at 23:41
















0












0








0








Assuming I have a boost::multi_index_container and want to access an index of it



  boost::multi_index_container< ... > bmi;
// lock here?
auto &index = boost::multi_index::get<0>(bmi); // <-- does this call need to be protected by a lock?

// or is it sufficient to lock here?

// access the index (need to have the lock here)


When multiple processes / threads access a multi_indesx_container, I need to use mutexes (or something of the sort). But do I need to protect getting the index itself, too?
I guess not, but could not find a guarantee in the docs.










share|improve this question
















Assuming I have a boost::multi_index_container and want to access an index of it



  boost::multi_index_container< ... > bmi;
// lock here?
auto &index = boost::multi_index::get<0>(bmi); // <-- does this call need to be protected by a lock?

// or is it sufficient to lock here?

// access the index (need to have the lock here)


When multiple processes / threads access a multi_indesx_container, I need to use mutexes (or something of the sort). But do I need to protect getting the index itself, too?
I guess not, but could not find a guarantee in the docs.







c++ boost locking multi-index






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edited Dec 30 '18 at 23:51







C. Duelli

















asked Dec 30 '18 at 23:32









C. DuelliC. Duelli

236




236













  • Are you adding or removing items in any of your threads?

    – drescherjm
    Dec 30 '18 at 23:40













  • sure, other threads will modifiy the index. (but getting the index itself... will the get() call return different objects if the multi_index gets modified?)

    – C. Duelli
    Dec 30 '18 at 23:41





















  • Are you adding or removing items in any of your threads?

    – drescherjm
    Dec 30 '18 at 23:40













  • sure, other threads will modifiy the index. (but getting the index itself... will the get() call return different objects if the multi_index gets modified?)

    – C. Duelli
    Dec 30 '18 at 23:41



















Are you adding or removing items in any of your threads?

– drescherjm
Dec 30 '18 at 23:40







Are you adding or removing items in any of your threads?

– drescherjm
Dec 30 '18 at 23:40















sure, other threads will modifiy the index. (but getting the index itself... will the get() call return different objects if the multi_index gets modified?)

– C. Duelli
Dec 30 '18 at 23:41







sure, other threads will modifiy the index. (but getting the index itself... will the get() call return different objects if the multi_index gets modified?)

– C. Duelli
Dec 30 '18 at 23:41














1 Answer
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Although it is not documented anywhere, get() is a static cast operation, which is intrinsically thread-safe.






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    1 Answer
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    1 Answer
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    active

    oldest

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    active

    oldest

    votes









    1














    Although it is not documented anywhere, get() is a static cast operation, which is intrinsically thread-safe.






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      Although it is not documented anywhere, get() is a static cast operation, which is intrinsically thread-safe.






      share|improve this answer




























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        Although it is not documented anywhere, get() is a static cast operation, which is intrinsically thread-safe.






        share|improve this answer















        Although it is not documented anywhere, get() is a static cast operation, which is intrinsically thread-safe.







        share|improve this answer














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        edited Dec 31 '18 at 11:40

























        answered Dec 31 '18 at 9:12









        Joaquín M López MuñozJoaquín M López Muñoz

        3,86811118




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