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On MacOSX, using g++, is std::vector .size() thread safe?

By : user3851464
Date : October 16 2020, 11:12 PM
I wish this helpful for you If you are calling ONLY vec->size() you are safe. But this is somehow difficult to believe. As soon you call any changing method, such as push_back a race can cause to get the wrong size.
code :

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Is read-only access to a vector (vector::operator[] and vector::size()) asynchronous-safe?

By : none
Date : March 29 2020, 07:55 AM
Any of those help Angew's answer is correct considering C++. Now that the question mentions POSIX environment, which could provide stronger guarantees, this needs another answer, which is:

Is std::vector::clear()-ing an inner vector of a 2-D vector thread safe?

By : Solutionseeker
Date : March 29 2020, 07:55 AM
I wish this helpful for you This is completely fine. Altering an element of the outer vector does not affect the other elements in any way.

Is std::vector or boost::vector thread safe?

By : William
Date : March 29 2020, 07:55 AM
To fix this issue The C++ standard makes certain threading guarantees for all the classes in the standard C++ library. These guarantees may not be what you'd expect them to be but for all standard C++ library classes certain thread safety guarantees are made. Make sure you read the guarantees made, though, as the threading guarantees of standard C++ containers don't usually align with what you would want them to be. For some classes different, usually stronger, guarantees are made and the answer below specifically applies to the containers. The containers essentially have the following thread-safety guarantees:
there can be multiple concurrent readers of the same container if there is one writer, there shall be no more writers and no readers

Thread-safe vector: Is this implementation thread-safe?

By : ckmason
Date : March 29 2020, 07:55 AM
This might help you I have a question regarding the term thread-safety. Let me give an example: , IMHO:
This is both safe and useful:

Are read from and writing to vector thread-safe operations in vector C++?

By : Feanor
Date : March 29 2020, 07:55 AM
To fix the issue you can do From Scott Meyers, Effective STL, Item 12: "Have realistic expectations about the thread safety of STL containers".
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