Operating System Concepts

Difference between Spinlock and Semaphore

Spinlocks Spinlocks assume the data you are protecting is accessed in both interrupt-handlers and normal kernel code. … Read more

Difference between Mutex and Semaphore

Besides the better readability, the code for mutex is smaller and slightly faster than the semaphore implementation. … Read more

What is Zombie process and How to create zombie process in Linux ?

Zombie process is the process which died immediately and whose parent didn’t cared to handled the status … Read more

C program to read mac address using WiFi interface name

If you need to get the mac address of certain wifi interface using C program, you can … Read more

What is Linux Out-Of-Memory OOM Killer ?

Major distribution kernels set the default value of /proc/sys/vm/overcommit_memory to zero, which means that processes can request … Read more

How to avoid a process from being killed in case of Out of Memory ?

In our previous post, we understood “What is Out of Memory Killer ?” In this post, we … Read more

How to avoid zombie process in Linux ?

Zombie process is the process which dies/finishes immediately and whose parent didn’t cares to handle the status … Read more

How to create process in Linux using fork system call ?

Below is simple process creation program using fork system call, fork return child’s process Id in main/parent … Read more

C program to check total and free RAM memory in Linux

Following C program helps you to identify what is the total and free memory / RAM available … Read more

Example for using shared data between two Unix threads

Following is the simple example to show, how we can create two threads at a time and … Read more

Creating a simple thread in Linux using pthread library api’s

In this post, we create a simple thread using pthread library API “pthread_create” and wait for this … Read more