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Coagulation :: The action or process of a liquid, especially blood, changing to a solid or semi-solid state.

Good customer service means having thorough knowledge of your inventory, experience with your products, and being able to help customers make the best choices for them.

This is a common error while compiling C program in Linux. This error occurs when you are using pthread_create function to create threads in your programs.

To fix this problem ensure following points:
Include header file pthread.h in your program.
Add –lpthread linker flag with compilation command.
1- Include Header file
#include <stdio.h>
#include <pthread.h>
...
...
2- Compile command
gcc main.c -o main -lpthread