undefined reference to `pthread_create' c++

Explanation of the "undefined reference to `pthread_create'" Error in C++

1. Understanding the Error Message When you encounter the error "undefined reference to pthread_create'", it indicates that the linker cannot find the implementation for thepthread_create` function, which is part of the POSIX threads (pthreads) library for multi-threading in C++.

2. Including the pthread Library To resolve this error, you need to link your C++ program with the pthread library. This can be achieved by adding the -pthread option to the compiler command when compiling and linking your program.

3. Compiler Command with pthread Library For example, if you are using the g++ compiler, the command to compile and link your program with the pthread library would be: g++ your_program.cpp -o your_program -pthread

4. Explanation of -pthread Option The -pthread option instructs the compiler to link the pthread library, which provides the necessary implementation for functions like pthread_create, allowing your program to use POSIX threads for multi-threading.

5. Recompiling and Linking After adding the -pthread option to your compiler command, recompile and link your C++ program to resolve the "undefined reference to `pthread_create'" error.