106 lines
2.9 KiB
C
106 lines
2.9 KiB
C
#include <minix/mthread.h>
|
|
#include "global.h"
|
|
|
|
/*===========================================================================*
|
|
* mthread_queue_add *
|
|
*===========================================================================*/
|
|
PUBLIC void mthread_queue_add(queue, thread)
|
|
mthread_queue_t *queue; /* Queue we want thread to append to */
|
|
mthread_thread_t thread;
|
|
{
|
|
/* Append a thread to the tail of the queue. As a process can be present on
|
|
* only one queue at the same time, we can use the threads array's 'next'
|
|
* pointer to point to the next thread on the queue.
|
|
*/
|
|
|
|
if (mthread_queue_isempty(queue)) {
|
|
queue->head = queue->tail = thread;
|
|
} else {
|
|
threads[queue->tail].m_next = thread;
|
|
queue->tail = thread; /* 'thread' is the new last in line */
|
|
}
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* mthread_queue_init *
|
|
*===========================================================================*/
|
|
PUBLIC void mthread_queue_init(queue)
|
|
mthread_queue_t *queue; /* Queue that has to be initialized */
|
|
{
|
|
/* Initialize queue to a known state */
|
|
|
|
queue->head = queue->tail = NO_THREAD;
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* mthread_queue_isempty *
|
|
*===========================================================================*/
|
|
PUBLIC int mthread_queue_isempty(queue)
|
|
mthread_queue_t *queue;
|
|
{
|
|
return(queue->head == NO_THREAD);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* mthread_dump_queue *
|
|
*===========================================================================*/
|
|
PUBLIC void mthread_dump_queue(queue)
|
|
mthread_queue_t *queue;
|
|
{
|
|
int threshold, count = 0;
|
|
mthread_thread_t t;
|
|
threshold = no_threads;
|
|
#ifdef MDEBUG
|
|
printf("Dumping queue: ");
|
|
#endif
|
|
if(queue->head != NO_THREAD) {
|
|
t = queue->head;
|
|
#ifdef MDEBUG
|
|
printf("%d ", t);
|
|
#endif
|
|
count++;
|
|
t = threads[t].m_next;
|
|
while (t != NO_THREAD) {
|
|
#ifdef MDEBUG
|
|
printf("%d ", t);
|
|
#endif
|
|
t = threads[t].m_next;
|
|
count++;
|
|
if (count > threshold) break;
|
|
}
|
|
} else {
|
|
#ifdef MDEBUG
|
|
printf("[empty]");
|
|
#endif
|
|
}
|
|
|
|
#ifdef MDEBUG
|
|
printf("\n");
|
|
#endif
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* mthread_queue_remove *
|
|
*===========================================================================*/
|
|
PUBLIC mthread_thread_t mthread_queue_remove(queue)
|
|
mthread_queue_t *queue; /* Queue we want a thread from */
|
|
{
|
|
/* Get the first thread in this queue, if there is one. */
|
|
mthread_thread_t thread = queue->head;
|
|
|
|
if (thread != NO_THREAD) { /* i.e., this queue is not empty */
|
|
if (queue->head == queue->tail) /* Queue holds only one thread */
|
|
queue->head = queue->tail = NO_THREAD; /*So mark thread empty*/
|
|
else
|
|
/* Second thread in line is the new first */
|
|
queue->head = threads[thread].m_next;
|
|
}
|
|
|
|
return(thread);
|
|
}
|
|
|