Multithreaded-System-Simulator

Description

A program required to be developed in C/C++, called a4tasks, that utilizes pthreads to simulate the concurrent execution of a set of tasks. The system has a number of resource types, and each resource type has a number of available units. All resource units in the system are non-sharable non-preemptable resources.

Usage

To compile a4tasks with make in bash run:

make

After compiling the a4tasks binary it can be invoked using the command line:

./a4tasks inputFile monitorTime NITER

Where the arguments are defined as:

inputFile: file describing the tasks to be executed.

monitorTime: integer (in milliseconds) that specifies how often a monitor thread runs.

NITER: integer noting the amount of iterations each task executes before the simulator finishes.

Input File

The simulator reads the system parameters from an input file. The file has a number of lines formatted as follows:
A line can be empty
A line that starts with a # is a comment line
A line of the form:

resources name1:value1 name2:value2 ...

specifies the resource types available in the system. The line starts with the keyword resources, followed by one, or more, name:value pairs of a resource type name, and the number of available units of this resource type, respectively.

A line of the form

task taskName busyTime idleTime name1:value1 name2:value2 ...

specifies a task in the system. The line has the following fields:

• task: a keyword that specifies a task line
• taskName: the task’s name

Example Input File

# An instance of the Dining Philosophers Problem with 5 people
#
resources A:1 B:1 C:1 D:1 E:1
task t1 50 100 A:1 B:1
task t2 50 100 B:1 C:1
task t3 50 100 C:1 D:1
task t4 50 100 D:1 E:1
task t5 50 100 E:1 A:1

Notes

• A simulation made by a4tasks may have up to NRES TYPES = 10 resource types and TASKS = 25 tasks
• Each string (a task or a resource type name) has at most 32 characters
• Each white space between fields is composed of one, or more, space character(s)
• There is no white space around the : field separator
• This is only the first draft of a two version Assignment
• monitorTime is only guaranteed accurate to 10 ms