sched.c

   1 #include <sys/time.h>
   2 #include "para.h"
   3 #include "ipc.h"
   4 #include "fd.h"
   5 #include "list.h"
   6 #include "sched.h"
   7 #include "string.h"
   8 #include "error.h"
   9
  10 struct list_head pre_select_list;
  11 struct list_head post_select_list;
  12
  13 static void sched_preselect(struct sched *s)
  14 {
  15         struct task *t, *tmp;
  16 again:
  17         list_for_each_entry_safe(t, tmp, &pre_select_list, pre_select_node) {
  18                 t->pre_select(s, t);
  19                 if (t->ret > 0 || !t->event_handler)
  20                         continue;
  21                 t->event_handler(t);
  22                 goto again;
  23         }
  24 }
  25
  26 static void sched_post_select(struct sched *s)
  27 {
  28         struct task *t, *tmp;
  29
  30         list_for_each_entry_safe(t, tmp, &post_select_list, post_select_node) {
  31                 t->post_select(s, t);
  32                 if (t->ret > 0 || !t->event_handler)
  33                         continue;
  34                 t->event_handler(t);
  35         }
  36 }
  37
  38 int sched(struct sched *s)
  39 {
  40
  41         gettimeofday(&s->now, NULL);
  42 again:
  43         FD_ZERO(&s->rfds);
  44         FD_ZERO(&s->wfds);
  45         s->timeout = s->default_timeout;
  46         s->max_fileno = -1;
  47         sched_preselect(s);
  48         s->select_ret = para_select(s->max_fileno + 1, &s->rfds,
  49                 &s->wfds, &s->timeout);
  50         if (s->select_ret < 0)
  51                 return s->select_ret;
  52         gettimeofday(&s->now, NULL);
  53         sched_post_select(s);
  54         if (list_empty(&pre_select_list) && list_empty(&post_select_list))
  55                 return 0;
  56         goto again;
  57 }
  58
  59 void *register_task(struct task *t)
  60 {
  61         PARA_INFO_LOG("registering %s (%p)\n", t->status, t);
  62         if (t->pre_select) {
  63                 PARA_DEBUG_LOG("pre_select: %p\n", &t->pre_select);
  64                 if (t->flags & PRE_ADD_TAIL)
  65                         list_add_tail(&t->pre_select_node, &pre_select_list);
  66                 else
  67                         list_add(&t->pre_select_node, &pre_select_list);
  68         }
  69         if (t->post_select) {
  70                 PARA_DEBUG_LOG("post_select: %p\n", &t->pre_select);
  71                 if (t->flags & POST_ADD_TAIL)
  72                         list_add_tail(&t->post_select_node, &post_select_list);
  73                 else
  74                         list_add(&t->post_select_node, &post_select_list);
  75         }
  76         return t;
  77 }
  78
  79 void unregister_task(struct task *t)
  80 {
  81         PARA_INFO_LOG("unregistering %s (%p)\n", t->status, t);
  82         if (t->pre_select)
  83                 list_del(&t->pre_select_node);
  84         if (t->post_select)
  85                 list_del(&t->post_select_node);
  86 };
  87
  88 void init_sched(void)
  89 {
  90         INIT_LIST_HEAD(&pre_select_list);
  91         INIT_LIST_HEAD(&post_select_list);
  92 };
  93
  94 void sched_shutdown(void)
  95 {
  96         struct task *t, *tmp;
  97
  98         list_for_each_entry_safe(t, tmp, &pre_select_list, pre_select_node)
  99                 unregister_task(t);
 100         /* remove tasks which do not have a pre_select hook */
 101         list_for_each_entry_safe(t, tmp, &post_select_list, post_select_node)
 102                 unregister_task(t);
 103 };
 104
 105
 106 //char *get_tast_list();