Thread::hardware_concurrency is an in-built function in C++ std::thread. It is an observer function which means it observes a state and then returns the corresponding output. This function returns the number of concurrent threads supported by the available hardware implementation. This value might not always be accurate.
Parameters: This function does not accept any parameters.
Return Value: It returns a non-negative integer denoting the number of concurrent threads supported by the system. If the value is either not computable or not well defined it returns 0.
Below program demonstrate the use of std::thread::joinable()
Note: On the online IDE this program will show error. To compile this, use the flag “-pthread” on g++ compilers compilation with the help of command “g++ –std=c++14 -pthread file.cpp”.
Number of concurrent threads supported are: 4
Attention reader! Don’t stop learning now. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready.
- Thread joinable() function in C++
- Thread get_id() function in C++
- Print numbers in sequence using thread synchronization
- Difference between Process and Kernel Thread
- What happens when a virtual function is called inside a non-virtual function in C++
- Function Overloading vs Function Overriding in C++
- Difference between Virtual function and Pure virtual function in C++
- How to call function within function in C or C++
- Difference between virtual function and inline function in C++
- Can we call an undeclared function in C++?
- Can we use function on left side of an expression in C and C++?
- Declare a C/C++ function returning pointer to array of integer pointers
- Function overloading and return type
- Default arguments and virtual function
- Function overloading and const keyword
- How to measure time taken by a function in C?
- Comparator function of qsort() in C
- Can we access private data members of a class without using a member or a friend function?
- Function Overloading and float in C++
- Extra brackets with function names in C/C++
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to email@example.com. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.