Banker's Algorithm
The Banker's algorithm is a deadlock avoidance algorithm that is used to prevent deadlock in a system. The Banker's algorithm is used to allocate resources to processes in a way that prevents deadlock. The Banker's algorithm is based on the concept of a safe state. A safe state is a state in which the system can allocate resources to processes in such a way that no process will be left waiting indefinitely for resources.
#include <stdio.h>
int main() {
int need[2][3] = {{3, 2, 2}, {2, 1, 1}};
int max[2][3] = {{7, 5, 3}, {4, 3, 2}};
int avail[3] = {3, 2, 2};
int safe = 1;
for (int i = 0; i < 2; i++) {
int can_finish = 1;
for (int j = 0; j < 3; j++) {
if (need[i][j] > avail[j]) {
can_finish = 0;
break;
}
}
if (can_finish) {
printf("Process %d can finish safely.\n", i + 1);
for (int j = 0; j < 3; j++) {
avail[j] += max[i][j];
}
} else {
safe = 0;
}
}
if (safe) {
printf("The system is in a safe state.\n");
} else {
printf("The system is in an unsafe state (deadlock possible).\n");
}
return 0;
}
Compiling and Running the Banker's Algorithm
To compile and run the Banker's algorithm, you can use the following commands:
gcc -o banker banker.c
./banker
Output
Process 1 can finish safely.
Process 2 can finish safely.
The system is in a safe state.
The output of the program shows that the system is in a safe state and that both processes can finish safely. This means that the system can allocate resources to the processes in such a way that no process will be left waiting indefinitely for resources.
Questions
What is the Banker's algorithm?
The Banker's algorithm is a deadlock avoidance algorithm that is used to prevent deadlock in a system.
What is a safe state?
A safe state is a state in which the system can allocate resources to processes in such a way that no process will be left waiting indefinitely for resources.
What is the output of the program?
The output of the program shows that the system is in a safe state and that both processes can finish safely.
What is the purpose of the safe variable?
The safe variable is used to determine whether the system is in a safe state or not.
What is the use of the can_finish variable?
The can_finish variable is used to determine whether a process can finish
safely or not.
What is the use of the need array?
The need array is used to store the resource needs of processes.
What is the use of the max array?
The max array is used to store the maximum resource requirements of
processes.
What is the use of the avail array?
The avail array is used to store the available resources in the system.
What is the use of the i and j variables in the loops?
The i variable is used to iterate over the processes, and the j variable
is used to iterate over the resources.
What is the use of the break statement in the loop?
The break statement is used to exit the loop early if a condition is met.