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 //              PARA_INFO_LOG("%s \n", t->status);
  20                 if (t->ret > 0)
  21                         continue;
  22                 if (!t->event_handler)
  23                         continue;
  24                 t->event_handler(t);
  25                 goto again;
  26         }
  27 }
  28
  29 static void sched_post_select(struct sched *s)
  30 {
  31         struct task *t, *tmp;
  32
  33         list_for_each_entry_safe(t, tmp, &post_select_list, post_select_node) {
  34                 t->post_select(s, t);
  35 //              PARA_INFO_LOG("%s \n", t->status);
  36                 if (t->ret > 0 || !t->event_handler)
  37                         continue;
  38                 t->event_handler(t);
  39         }
  40 }
  41
  42 int sched(struct sched *s)
  43 {
  44
  45         gettimeofday(&s->now, NULL);
  46 again:
  47         FD_ZERO(&s->rfds);
  48         FD_ZERO(&s->wfds);
  49         s->timeout = s->default_timeout;
  50         s->max_fileno = -1;
  51         sched_preselect(s);
  52         s->select_ret = para_select(s->max_fileno + 1, &s->rfds,
  53                 &s->wfds, &s->timeout);
  54         if (s->select_ret < 0)
  55                 return s->select_ret;
  56         gettimeofday(&s->now, NULL);
  57         sched_post_select(s);
  58         if (list_empty(&pre_select_list) && list_empty(&post_select_list))
  59                 return 0;
  60         goto again;
  61 }
  62
  63 void *register_task(struct task *t)
  64 {
  65         PARA_INFO_LOG("registering %s (%p)\n", t->status, t);
  66         if (t->pre_select) {
  67                 PARA_DEBUG_LOG("pre_select: %p\n", &t->pre_select);
  68                 if (t->flags & PRE_ADD_TAIL)
  69                         list_add_tail(&t->pre_select_node, &pre_select_list);
  70                 else
  71                         list_add(&t->pre_select_node, &pre_select_list);
  72         }
  73         if (t->post_select) {
  74                 PARA_DEBUG_LOG("post_select: %p\n", &t->pre_select);
  75                 if (t->flags & POST_ADD_TAIL)
  76                         list_add_tail(&t->post_select_node, &post_select_list);
  77                 else
  78                         list_add(&t->post_select_node, &post_select_list);
  79         }
  80         return t;
  81 }
  82
  83 void unregister_task(struct task *t)
  84 {
  85         PARA_INFO_LOG("unregistering %s (%p)\n", t->status, t);
  86         if (t->pre_select)
  87                 list_del(&t->pre_select_node);
  88         if (t->post_select)
  89                 list_del(&t->post_select_node);
  90 };
  91
  92 void init_sched(void)
  93 {
  94         INIT_LIST_HEAD(&pre_select_list);
  95         INIT_LIST_HEAD(&post_select_list);
  96 };
  97
  98 void sched_shutdown(void)
  99 {
 100         struct task *t, *tmp;
 101
 102         list_for_each_entry_safe(t, tmp, &pre_select_list, pre_select_node)
 103                 unregister_task(t);
 104         /* remove tasks which do not have a pre_select hook */
 105         list_for_each_entry_safe(t, tmp, &post_select_list, post_select_node)
 106                 unregister_task(t);
 107 };
 108
 109
 110 //char *get_tast_list();