Tags down


How can I show that assignment is not atomic?

By : Linux_Wangpeng
Date : July 30 2020, 11:00 AM
I wish did fix the issue. Grab the disassembly and then check the documentation for your architecture; on some machines you'll find even standard "non-atomic" operations (in terms of C++) are actually atomic when it hits the hardware (in terms of assembly).
With that said, your compiler will know what is and isn't safe and it is therefore a better idea to use the std::atomic template to make your code more portable across architectures. If you're on a platform that doesn't require anything special, it'll typically get optimised down to a primitive type anyway (putting memory ordering aside).
code :

Share : facebook icon twitter icon

Is compound assignment ^= atomic in C#?

By : user3167192
Date : March 29 2020, 07:55 AM
it fixes the issue As answered above, x^=1 is not atomic. Could you use Interlocked.Increment (which is atomic) and then, when reading, consider the value % 2?

Python: conversion of a iterated assignment with an atomic assignment using numpy is not working when matrix height >

By : user2519149
Date : March 29 2020, 07:55 AM
seems to work fine I get the problem!
I cast the matrix I to uint8 and so matrix I elements are between 0 and 255.

What does assignment mean to a C11 atomic?

By : bhag jathol
Date : March 29 2020, 07:55 AM
like below fixes the issue Operations on objects that are _Atomic qualified (and atomic_int is just a different writing for that) are guaranteed to have sequential consistency. You find that mentionned at the end of the semantics section for each of the operands. (And maybe the mention for assignment is missing.)
Your code is not correct at two places: initialization must use the ATOMIC_VAR_INIT macro (, and memcpy is undefined (the sizes might not agree), although it probably will work on most of the architectures.
code :
tmp = mc + 4;                // Arithmetic
mc += 4;                // Arithmetic

C# Is value type assignment atomic?

By : user2145915
Date : March 29 2020, 07:55 AM
this will help Structs are value types. If you assign a struct to a variable/field/method parameter, the whole struct content will be copied from the source storage location to the storage location of the variable/field/method parameter (the storage location in each case being the size of the struct itself).
Copying a struct is not guaranteed to be an atomic operation. As written in the C# language specification:

Are assignment = and subtraction assignment -= atomic operations in C?

By : belrod
Date : March 29 2020, 07:55 AM
I hope this helps you . It depends on the implementation. By the standard, nothing is atomic in C. If you need atomic ops you can look at your compiler's builtins.
Related Posts Related Posts :
  • How can I store all data the user inputs and then show them if they want to see all of them
  • Use depth texture in compute shader
  • error: conflicting declaration using universal references
  • Using std::optional instead of own structure
  • Is it necessary to make pointer Null when there is no use of it at the end in c++
  • How are std::array's compared in C++?
  • Herb Sutter's article on making virtual functions private
  • Interaction between copy-and-swap idiom and move operations
  • Problems using overloaded extraction operator in C++
  • segmentation fault on reading certain files, seems to be unrelated to filesize
  • Protected members of base classes inaccessible to friends of derived classes
  • Constructing smart pointer from stack allocated raw pointer
  • Array Index Overload Bug
  • Why I'm getting " void value not ignored as it ought to be"?
  • Need help converting a string to a char in c++ ---- ERROR A value of type "const char *" cannot be used to ini
  • What means put preprocessor in std::string?
  • Is it possible to compare an array elements with a hard-coded initializer list without loop?
  • Complexity of an specific algorithm with 3 for?
  • Character converting funtion std::isupper() & std::islower() C++17
  • Hide method taking template parameter reference in cpp file
  • Disable the std::initializer_list constructor
  • What does "static_cast<double>(123)" mean in C++?
  • How to use libraries (*.a files) in C++ when using cmake
  • Use class name for conditional macro expansion
  • C++ variable names (can declare main as variable however same is not true for other functions name)
  • error: ‘nullptr’ was not declared in this scope
  • Why is the z coordinate flipped after multiplying with a matrix in GLSL - OpenGL
  • QML use C ++ function with parameters
  • How can I convert a character from a string into a integer variable using C++
  • Can range-v3 contains work on initializer list?
  • How would I calculate the runtime of this function?
  • Is there a way to produce random numbers simultaneously in c++? If not, is there a work around?
  • How do you create a dynamic array for struct elements of different variable types for c++?
  • Subclass address equal to virtual base class address?
  • _mm_xor_pd fails with product = 0
  • I got a stack overflow error in my int main()
  • Why does imwrite on BMP image gets stuck / does not return?
  • Why program throws runtime error while iterating over an emtpy vector in c++
  • Unknown error while debugging a QT-application with Visual Studio Code and CMake-Tools
  • Is `string.assign(string.data(), 5)` well-defined or UB?
  • Modern way to have a map that can point-to or reference data of different types that has been allocated on the stack
  • Why does my recursive function print in descending order and then in ascending order?
  • Fill vector with true value
  • Automate "yes" to Popen SSH command
  • warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
  • What is wrong in this C++ code snippet with template<class Vector>
  • Printing hollow square with array
  • Overload -> arrow operator in shared_ptr<interface> instance with no pure virtual destructor in interface
  • Run thread with derived method from base class without using templates
  • Issues with template class conversion - unable to deduce function called
  • How is memory deallocated in c++
  • is it possible to reduce delete code size with templates in C++
  • How to resolve Ninja c++ build and execution
  • Trying to control multithreaded access to array using std::atomic
  • Checking which object called the other's object method
  • How do we run a single test using Google bazel
  • Should I add other files to git except .cpp?
  • Idiom for handling size_t underflow in loop condition
  • What is Kotlin for C++ push_back() and pop_back() on a string?
  • Tree implementation in C++: Cannot convert Node to int* Ask Question
  • shadow
    Privacy Policy - Terms - Contact Us © voile276.org