/* Prototypes for CS6210 Project 2, Fall 1999 "GTHreads" */
/* DO NOT EDIT */

/* Definitions for return values */

#define GT_SUCCESS 0
#define GT_FAILED  1

#define GT_MUTEX void*  /* Type of a mutex */

int GThread_init(       /* Initialize GTHreads package */
    int   SchedulingInterval); /* Context switch interval, in microseconds */
                               /* If 0 specified, NO PREEMPTION! */
                        /* Return GT_SUCCESS if Succeeded */

int GThread_create(     /* Create a new thread */
    void* pStartFunc,   /* Address of starting function for thread */
    void* pParam,       /* Address of a parameter to be passed to thread */
    int   StackSize);   /* Size of stack for this thread */
                        /* Return GT_SUCCESS if Succeeded */

void GThread_yield(void);/* Relinquish control of CPU to another thread */

void GThread_exit(void);/* Notify scheduler that thread has completed */
                        /* DOES NOT RETURN */

int GThread_count();    /* Return number of threads active */

/* Mutex related calls */

int GTMutex_create(     /* Create a new mutex */ 
    GT_MUTEX* pMutex);  /* Address of mutex to create */
                        /* Return GT_SUCCESS if Succeeded */

void GTMutex_lock(      /* Lock the specified mutex */
    GT_MUTEX Mutex);    /* Mutex to lock */

int GTMutex_unlock(     /* Unlock the specified mutex */
    GT_MUTEX Mutex);    /* Mutex to unlock */

int GTMutex_islocked(   /* Return status of mutex, 1 = locked, 0 = not locked */
    GT_MUTEX Mutex);    /* Mutex to check */

int GTMutex_SCount(     /* Return number of successful locks */
    GT_MUTEX Mutex);    /* Mutex to check */

int GTMutex_UCount(     /* Return number of unsuccessful locks */
    GT_MUTEX Mutex);    /* Mutex to check */