/* Copyright (C) 2003 Russ Cox, Massachusetts Institute of Technology *//* See COPYRIGHT */ #include <u.h>#include <libc.h>#include <mux.h> typedef struct Qel Qel;struct Qel{ Qel *next; void *p;}; struct Muxqueue{ int hungup; QLock lk; Rendez r; Qel *head; Qel *tail;}; Muxqueue*_muxqalloc(void){ Muxqueue *q; q = mallocz(sizeof(Muxqueue), 1); if(q == nil) return nil; q->r.l = &q->lk; return q;} int_muxqsend(Muxqueue *q, void *p){ Qel *e; e = malloc(sizeof(Qel)); if(e == nil) return -1; qlock(&q->lk); if(q->hungup){ werrstr("hungup queue"); qunlock(&q->lk); free(e); return -1; } e->p = p; e->next = nil; if(q->head == nil) q->head = e; else q->tail->next = e; q->tail = e; rwakeup(&q->r); qunlock(&q->lk); return 0;} void*_muxqrecv(Muxqueue *q){ void *p; Qel *e; qlock(&q->lk); while(q->head == nil && !q->hungup) rsleep(&q->r); if(q->hungup){ qunlock(&q->lk); return nil; } e = q->head; q->head = e->next; qunlock(&q->lk); p = e->p; free(e); return p;} int_muxnbqrecv(Muxqueue *q, void **vp){ void *p; Qel *e; qlock(&q->lk); if(q->head == nil){ qunlock(&q->lk); *vp = nil; return q->hungup; } e = q->head; q->head = e->next; qunlock(&q->lk); p = e->p; free(e); *vp = p; return 1;} void_muxqhangup(Muxqueue *q){ qlock(&q->lk); q->hungup = 1; rwakeupall(&q->r); qunlock(&q->lk);}
/* Copyright (C) 2003 Russ Cox, Massachusetts Institute of Technology */
/* See COPYRIGHT */
#include <u.h>
#include <libc.h>
#include <mux.h>
typedef struct Qel Qel;
struct Qel
{
Qel *next;
void *p;
};
struct Muxqueue
{
int hungup;
QLock lk;
Rendez r;
Qel *head;
Qel *tail;
};
Muxqueue*
_muxqalloc(void)
{
Muxqueue *q;
q = mallocz(sizeof(Muxqueue), 1);
if(q == nil)
return nil;
q->r.l = &q->lk;
return q;
}
int
_muxqsend(Muxqueue *q, void *p)
{
Qel *e;
e = malloc(sizeof(Qel));
if(e == nil)
return -1;
qlock(&q->lk);
if(q->hungup){
werrstr("hungup queue");
qunlock(&q->lk);
free(e);
return -1;
}
e->p = p;
e->next = nil;
if(q->head == nil)
q->head = e;
else
q->tail->next = e;
q->tail = e;
rwakeup(&q->r);
qunlock(&q->lk);
return 0;
}
void*
_muxqrecv(Muxqueue *q)
{
void *p;
Qel *e;
qlock(&q->lk);
while(q->head == nil && !q->hungup)
rsleep(&q->r);
if(q->hungup){
qunlock(&q->lk);
return nil;
}
e = q->head;
q->head = e->next;
qunlock(&q->lk);
p = e->p;
free(e);
return p;
}
int
_muxnbqrecv(Muxqueue *q, void **vp)
{
void *p;
Qel *e;
qlock(&q->lk);
if(q->head == nil){
qunlock(&q->lk);
*vp = nil;
return q->hungup;
}
e = q->head;
q->head = e->next;
qunlock(&q->lk);
p = e->p;
free(e);
*vp = p;
return 1;
}
void
_muxqhangup(Muxqueue *q)
{
qlock(&q->lk);
q->hungup = 1;
rwakeupall(&q->r);
qunlock(&q->lk);
}