intq.h File Reference

#include "threads/interrupt.h"
#include "threads/synch.h"

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Classes
struct	intq

Macros
#define	INTQ_BUFSIZE   64

Functions
void	intq_init (struct intq *)
bool	intq_empty (const struct intq *)
bool	intq_full (const struct intq *)
uint8_t	intq_getc (struct intq *)
void	intq_putc (struct intq *, uint8_t)

Macro Definition Documentation

INTQ_BUFSIZE

#define INTQ_BUFSIZE   64

Function Documentation

intq_empty()

bool intq_empty

(

const struct intq *

q

)

                                  {
    ASSERT (intr_get_level () == INTR_OFF);
    return q->head == q->tail;
}

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intq_full()

bool intq_full

(

const struct intq *

q

)

                                 {
    ASSERT (intr_get_level () == INTR_OFF);
    return next (q->head) == q->tail;
}

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intq_getc()

uint8_t intq_getc

(

struct intq *

q

)

                           {
    uint8_t byte;
 
    ASSERT (intr_get_level () == INTR_OFF);
    while (intq_empty (q)) {
        ASSERT (!intr_context ());
        lock_acquire (&q->lock);
        wait (q, &q->not_empty);
        lock_release (&q->lock);
    }
 
    byte = q->buf[q->tail];
    q->tail = next (q->tail);
    signal (q, &q->not_full);
    return byte;
}

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intq_init()

void intq_init

(

struct intq *

q

)

                           {
    lock_init (&q->lock);
    q->not_full = q->not_empty = NULL;
    q->head = q->tail = 0;
}

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intq_putc()

void intq_putc	(	struct intq *	q,
		uint8_t	byte
	)

                                         {
    ASSERT (intr_get_level () == INTR_OFF);
    while (intq_full (q)) {
        ASSERT (!intr_context ());
        lock_acquire (&q->lock);
        wait (q, &q->not_full);
        lock_release (&q->lock);
    }
 
    q->buf[q->head] = byte;
    q->head = next (q->head);
    signal (q, &q->not_empty);
}

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