servers/vm/asynsend.c

   1
   2 #define _SYSTEM 1
   3
   4 #include <minix/callnr.h>
   5 #include <minix/com.h>
   6 #include <minix/config.h>
   7 #include <minix/const.h>
   8 #include <minix/ds.h>
   9 #include <minix/endpoint.h>
  10 #include <minix/keymap.h>
  11 #include <minix/minlib.h>
  12 #include <minix/type.h>
  13 #include <minix/ipc.h>
  14 #include <minix/sysutil.h>
  15 #include <minix/syslib.h>
  16
  17 #include <errno.h>
  18 #include <string.h>
  19 #include <env.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22
  23 #include "proto.h"
  24 #include "util.h"
  25
  26 #define SENDSLOTS _NR_PROCS
  27
  28 PRIVATE asynmsg_t msgtable[SENDSLOTS];
  29 PRIVATE size_t msgtable_n= SENDSLOTS;
  30
  31 PUBLIC int asynsend(dst, mp)
  32 endpoint_t dst;
  33 message *mp;
  34 {
  35         int i;
  36         unsigned flags;
  37
  38         /* Find slot in table */
  39         for (i= 0; i<msgtable_n; i++)
  40         {
  41                 flags= msgtable[i].flags;
  42                 if ((flags & (AMF_VALID|AMF_DONE)) == (AMF_VALID|AMF_DONE))
  43                 {
  44                         if (msgtable[i].result != OK)
  45                         {
  46                                 printf(
  47                       "VM: asynsend: found completed entry %d with error %d\n",
  48                                         i, msgtable[i].result);
  49                         }
  50                         break;
  51                 }
  52                 if (flags == AMF_EMPTY)
  53                         break;
  54         }
  55         if (i >= msgtable_n)
  56                 vm_panic("asynsend: should resize table", i);
  57         msgtable[i].dst= dst;
  58         msgtable[i].msg= *mp;
  59         msgtable[i].flags= AMF_VALID;   /* Has to be last. The kernel
  60                                          * scans this table while we are
  61                                          * sleeping.
  62                                          */
  63
  64         /* Tell the kernel to rescan the table */
  65         return senda(msgtable, msgtable_n);
  66 }
  67