Question

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Programming Question: (15pts)

Assume a finite number of resources of a single resource type must be managed. Processes may ask for a number of these resources and will return them once finished. If all resources are in use the request is denied and the process terminates. Ensure thread safety by using mutex locks – be sure to only include necessary code inside the critical section. The maximum number of resources and the number of available resources are declared as follows:

#define RESOURCES 10

int available_resources = RESOURCES;

Create 5 threads which will be requesting resources (process and thread is used interchangeably in the description of this problem). Apart from your main function, create 3 functions to perform the following tasks:

request_resources – this function will receive the requested number of resources and determine if the request can be filled or not, if the request is filled the number of available_resources must be adjusted, if it not filled return -1 to indicate the request was not filled.

release_resources – this function will receive the number of resources the process is releasing and will adjust the number of available_resources.

process_manager – each process will execute this function. The purpose of this function is to randomly determine the number of resources the process is going to request (random number between 1 and 5), call the request function to determine if the request if filled.

If the request is filled, print out a message indicating the number of resources the process is allocated, wait for up to 3 seconds (randomly determine the time), and then call the release function to indicate the process is done with the resources. Print out a message indicating how many resources were released, terminate the process.

If the request is denied, print out an appropriate message and terminate the process.

Answer 1

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