ECE 329 Project 1 of 2
Programming Assignment 3 - Threads
Write a C module that implements the simulation of a lightweight thread
package. The code should contain the following interface and functions:
/* initialize the lightweight thread package */
int Thread_Init();
/* create new thread that executes task fptrThread */
int Thread_Create(int (*fptrThread)(),
char *strName, int iStackIndex);
/* O/S pre-empts current thread for the next thread */
int Thread_Yield();
/* thread ceases to run, */
/* if last thread then process calls exit() */
int Thread_Exit();
The function Thread_Init() must be called exactly once before any of the
other two functions.
The function Thread_Create() should only be called from the main thread
(the original thread of your program, not by a thread created with
Thread_Create()).
Each call to Thread_Create() must have a unique value (iStackIndex)
relating to where the corresponding thread’s stack is located.
Upon executing Thread_Init() your program should be transformed into a
system that includes a global Ready queue of threads ready to run with
exactly one thread in the queue - the main thread. Subsequently, the main
thread may start additional threads with Thread_Create(). Any thread can
execute Thread_Yield() to yield the CPU to another thread voluntarily. If
there is more than one thread (main included) desiring execution, a
SIGALRM signal should be used to automatically yield the CPU once every
second.
Your testing code (threads_test.c) should contain at least four and no more
than eight different thread functions (excluding main). These functions
should be written so as to update the display several times a second so that
