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Why shared_timed_mutex is defined in c++14, but shared_mutex in c++17?


Why shared_timed_mutex is defined in c++14, but shared_mutex in c++17?

By : imunkadidon
Date : November 20 2020, 11:01 PM
To fix the issue you can do Shared mutex originally had timing in it, and was called shared_mutex.
An implementor (msvc iirc) noted they could implement it "cheaper" without timing. In particular, SRWLOCK is an existing primitive on windows that is sufficient to implement shared mutex, but timed requires extra machinery. (Via @t.c.). (However, I believe it isn't just easier because already written, but also fundamentally more expensive, at least on x86/64 windows)
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error: use of deleted function boost::shared_mutex::shared_mutex

error: use of deleted function boost::shared_mutex::shared_mutex


By : Tipple9
Date : March 29 2020, 07:55 AM
around this issue You're trying to copy a mutex. That is not possible.
You're triggering that from
code :
 from myprogram.h:2,
 from myprogram.cpp:1:
struct MyClass {
    boost::shared_mutex sm;
};

std::vector<MyClass> v;
// etc.
Is C++17 std::shared_mutex not available yet?

Is C++17 std::shared_mutex not available yet?


By : Neil Xie
Date : March 29 2020, 07:55 AM
To fix this issue The confusion on cppreference was probably because std::shared_mutex really was added to GCC 5.0, in revision 200134. But that was the early incarnation of that type based on a C++1y draft. In fact it was the timed shared mutex, which was called std::shared_mutex at the time.
Before the final C++14 standard was published std::shared_mutex was renamed to std::shared_timed_mutex, and so before the GCC 5.1 release (which is the first release in the 5.x series) the type in libstdc++ was renamed, see revision 207964.
C++14 shared_timed_mutex VS C++11 mutex

C++14 shared_timed_mutex VS C++11 mutex


By : kylie burgess
Date : March 29 2020, 07:55 AM
hope this fix your issue Since your question is somewhat vague and the behavior is not reproducible by anyone aside from yourself, I can only guess.
My best guess is:
shared_timed_mutex not available on OS X 10.11.2?

shared_timed_mutex not available on OS X 10.11.2?


By : Edoardo Antonini
Date : March 29 2020, 07:55 AM
this one helps. For the past two years (as I write this) Apple has updated the libc++ headers for their tools releases, but not the libc++ sources. And libc++ implements std::shared_time_mutex both in and in shared_mutex.cpp.
When is std::shared_timed_mutex slower than std::mutex and when (not) to use it?

When is std::shared_timed_mutex slower than std::mutex and when (not) to use it?


By : Sadik Ahmed Autonu
Date : March 29 2020, 07:55 AM
I wish this help you When is it better to use an std::shared_timed_mutex than a plain std::mutex? How many times should readers/reads outnumber writers/writes? Of course I get that it depends on many factors, but how should I make a decision which one to use?
Because of their extra complexity, cases where read/writer locks (std::shared_mutex, std::shared_timed_mutex) are superior to plain lock (std::mutex, std::timed_mutex) are rare. They do exist, but personally, I never encountered one myself.
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