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#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "dat.h"
struct ms tubes;
tube
make_tube(const char *name)
{
tube t;
t = new(struct tube);
if (!t) return NULL;
t->name[MAX_TUBE_NAME_LEN - 1] = '\0';
strncpy(t->name, name, MAX_TUBE_NAME_LEN - 1);
if (t->name[MAX_TUBE_NAME_LEN - 1] != '\0') twarnx("truncating tube name");
t->ready.less = job_pri_less;
t->delay.less = job_delay_less;
t->ready.rec = job_setheappos;
t->delay.rec = job_setheappos;
t->buried = (struct job) { };
t->buried.prev = t->buried.next = &t->buried;
ms_init(&t->waiting, NULL, NULL);
return t;
}
static void
tube_free(tube t)
{
prot_remove_tube(t);
free(t->ready.data);
free(t->delay.data);
ms_clear(&t->waiting);
free(t);
}
void
tube_dref(tube t)
{
if (!t) return;
if (t->refs < 1) return twarnx("refs is zero for tube: %s", t->name);
--t->refs;
if (t->refs < 1) tube_free(t);
}
void
tube_iref(tube t)
{
if (!t) return;
++t->refs;
}
static tube
make_and_insert_tube(const char *name)
{
int r;
tube t = NULL;
t = make_tube(name);
if (!t) return NULL;
/* We want this global tube list to behave like "weak" refs, so don't
* increment the ref count. */
r = ms_append(&tubes, t);
if (!r) return tube_dref(t), (tube) 0;
return t;
}
tube
tube_find(const char *name)
{
tube t;
size_t i;
for (i = 0; i < tubes.used; i++) {
t = tubes.items[i];
if (strncmp(t->name, name, MAX_TUBE_NAME_LEN) == 0) return t;
}
return NULL;
}
tube
tube_find_or_make(const char *name)
{
return tube_find(name) ? : make_and_insert_tube(name);
}