tube.c

   1 #include "dat.h"
   2 #include <stdint.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5
   6 struct Ms tubes;
   7
   8 Tube *
   9 make_tube(const char *name)
  10 {
  11     Tube *t = new(Tube);
  12     if (!t)
  13         return NULL;
  14
  15     strncpy(t->name, name, MAX_TUBE_NAME_LEN);
  16     if (t->name[MAX_TUBE_NAME_LEN - 1] != '\0') {
  17         t->name[MAX_TUBE_NAME_LEN - 1] = '\0';
  18         twarnx("truncating tube name");
  19     }
  20
  21     t->ready.less = job_pri_less;
  22     t->delay.less = job_delay_less;
  23     t->ready.setpos = job_setpos;
  24     t->delay.setpos = job_setpos;
  25
  26     Job j = {.tube = NULL};
  27     t->buried = j;
  28     t->buried.prev = t->buried.next = &t->buried;
  29     ms_init(&t->waiting_conns, NULL, NULL);
  30
  31     return t;
  32 }
  33
  34 static void
  35 tube_free(Tube *t)
  36 {
  37     ms_remove(&tubes, t);
  38     free(t->ready.data);
  39     free(t->delay.data);
  40     ms_clear(&t->waiting_conns);
  41     free(t);
  42 }
  43
  44 void
  45 tube_dref(Tube *t)
  46 {
  47     if (!t) return;
  48     if (t->refs < 1) {
  49         twarnx("refs is zero for tube: %s", t->name);
  50         return;
  51     }
  52
  53     --t->refs;
  54     if (t->refs < 1)
  55         tube_free(t);
  56 }
  57
  58 void
  59 tube_iref(Tube *t)
  60 {
  61     if (!t) return;
  62     ++t->refs;
  63 }
  64
  65 static Tube *
  66 make_and_insert_tube(const char *name)
  67 {
  68     int r;
  69     Tube *t = NULL;
  70
  71     t = make_tube(name);
  72     if (!t)
  73         return NULL;
  74
  75     /* We want this global tube list to behave like "weak" refs, so don't
  76      * increment the ref count. */
  77     r = ms_append(&tubes, t);
  78     if (!r)
  79         return tube_dref(t), (Tube *) 0;
  80
  81     return t;
  82 }
  83
  84 Tube *
  85 tube_find(Ms *tubeset, const char *name)
  86 {
  87     size_t i;
  88
  89     for (i = 0; i < tubeset->len; i++) {
  90         Tube *t = tubeset->items[i];
  91         if (strncmp(t->name, name, MAX_TUBE_NAME_LEN) == 0)
  92             return t;
  93     }
  94     return NULL;
  95 }
  96
  97 Tube *
  98 tube_find_or_make(const char *name)
  99 {
 100     Tube *t = tube_find(&tubes, name);
 101     if (t)
 102         return t;
 103     return make_and_insert_tube(name);
 104 }
 105