The Priority Scheduling Program In C Programming is a program that schedules tasks according to the priority of the tasks. The program takes into account the number of tasks being scheduled, the number of resources available, and the number of tasks that are due.
C programming is the language that is used to write a program that does a specific task. C programming is a general-purpose programming language and it is mainly used for the creation of system software and applications. C programming is widely used in embedded systems because it is compiled into native code that executes efficiently.
The importance of Priority scheduling
Priority scheduling is one of the most important programming techniques in C programming. C priority scheduling helps to control the order of execution of a task.
In a program, a task is a piece of code that is executed by a computer. The tasks are executed in the order of the program that is in turn depends on the priorities.
If the priority of a task is high, then the task is executed first. Otherwise, the task with a low priority is executed first.
The main purpose of priority scheduling is to schedule the execution of a task in the best possible way. This is done to avoid the tasks that are not necessary to be executed.
The priority of a task is decided based on the importance of the task. The importance of a task is the amount of resources and time that is required for a task to be executed.
The importance of a task is the time that is required to execute the task. It is the amount of CPU cycles and memory that is required for a task to be executed.
A quick introduction to the Priority Scheduling Program in C programming
C programming is a programming language which is mostly used in Computer Engineering, Networking and Electronics. This short article provides a brief introduction to the Priority Scheduling Program in C Programming language.
Introduction
Priority scheduling is the process of determining which task will be executed first. It is a fundamental technique that underlies the operation of operating systems and is useful for many other applications as well. Priority scheduling is commonly implemented as a priority queue.
Priority queue is an ordered collection of items. Each item is identified by a unique key, called priority. A typical priority queue contains only the keys that are smaller than some value. Once the highest priority item is removed, the next highest priority item is the first to be added. This process continues until the queue is empty.
What are priorities?
Priorities are the order of tasks that we have to accomplish in a day. These are the top level activities that we want to do in a day. As a software developer, prioritizing is essential, because we can’t just spend all the time coding. We need to code and then focus on testing and debugging.
We need to prioritize the task in order to achieve the goals of the project. There are two types of priorities:
- Urgent
- Non-Urgent
Let’s see how to implement these priorities in our C programs.
Implementing the priorities in C programming
We use the terms urgent and non-urgent. Urgent is that which needs to be done first and urgent means that the priority is very high.
Priorities are used in programming to make sure that all the codes are completed in a proper order.
struct priority_queue {
char *key; // the key is the unique identifier of the object
int priority; // the priority value represents the priority of the object
};
The Priority Scheduling Program
Priority Scheduling Program is implemented using a Priority Queue.
// Function to insert a new element into the queue
void insert(int key, int priority)
{
priority_queue pq;
pq.key = malloc(sizeof(int));
pq.key = key;
pq.priority = priority;
pq.key = pq.key + 1;
if(pq.key == NULL) // If the key is already present
{
pq.key = pq.key + 1; // then add a new element
pq.priority = priority;
}
else // Otherwise, add the new element
{
pq.priority = priority;
}
}
// Function to delete the minimum key from the queue
void delete_min()
{
priority_queue pq;
pq.key = malloc(sizeof(int));
pq.key = pq.key - 1;
pq.priority = pq.priority - 1;
free(pq.key);
}
// Function to print the contents of the queue
void print_queue(priority_queue pq)
{
int i;
for(i = 0; i < pq.key; i++)
printf("%d ", pq.priority);
printf("\n");
}
/*
Program to demonstrate the Priority Queue
*/
// Driver Program to demonstrate the Priority Queue
int main()
{
int key;
priority_queue pq;
printf("Enter the key of an item to be inserted into the queue : ");
scanf("%d", &key);
insert(key, 10);
print_queue(pq);
delete_min();
print_queue(pq);
return 0;
}
Priority Queue in C Programming
A priority queue is represented as a struct with two fields. One of the fields contains the key, the other field contains the priority value.
Priority scheduling program in C programming language
Programming languages are everywhere. They can be complex, and often, they’re used to create applications and programs. One such program is the priority scheduling program in C programming language. This program helps the user prioritize a list of tasks.
To use this program, the user needs to first define the set of tasks to be prioritized. Then, he should enter the number of priority levels and the number of tasks in each level. This information is stored in a structure called a priority queue. The user is then free to run the program to perform a number of operations.
The first operation is to find the maximum value in the priority queue. The second is to print the entire priority queue. The third is to display the minimum value in the priority queue. The last is to display the entire priority queue. The program also has an option to find the sum of the priority values and the sum of the priorities in the priority queue.
The priority queue stores information regarding the tasks. These include the name of the task, the priority, the deadline, and the time the task was performed. Each task is assigned a unique ID so that the user can easily access it.
How the program works?
The program works in three phases.
- The first phase is to sort the entire set of tasks into different levels based on their priorities. The user provides the required information during this phase. The user can specify the number of priority levels and the number of tasks in each level.
- The second phase is to check the value of the current task. If the value is greater than the previous one, then the user can stop the process. Otherwise, the user must continue.
- The third phase is to perform a series of operations on the priority queue.
The program supports the following operations:
- Find maximum value.
- Find minimum value.
- Print the entire priority queue.
- Display the entire priority queue.
- Find sum of the priorities and the sum of the priorities.
Priority queue is a data structure that is used for storing elements and their priorities. It can be created by combining a heap and a stack. The stack will act as the first in, first out (FIFO) container while the heap will store the elements with higher priority.
You will create a queue when you want to execute a function in a specific order. It is because you can sort the elements in the queue based on the priorities.
Another Example – Creating a priority queue in C
The first thing you will need is a struct that will hold the priority and the element.
struct Element
{
char *name;
int priority;
};
The next step is to create a function called insert to insert an element into the queue.
void insert(Element *element)
{
//if the element is already in the queue, just add its priority to the priority
//of the element that is already in the queue
//else create a new node for the element, copy its name, and then add it to the queue
//create a new node and store the element name and priority
Element *newElement = malloc(sizeof(Element));
//copy the name of the element
strcpy(newElement->name, element->name);
//add the priority
newElement->priority = element->priority;
//add the element to the queue
pqInsert(pq, newElement);
}
The next step is to create a function called pop that will remove the element with the highest priority from the queue.
int pop()
{
Element *current = pqHead;
if(current!= NULL)
{
pqRemove(pq, current);
return current->priority;
}
return 0;
}
Finally, you will create a function called print that will print the queue.
void print(pq)
{
printf("%s\n", pqHead->name);
//iterate through the queue and print the elements
while(pqNext(pq)!= NULL)
{
printf("%s\n", pq->name);
}
}
