rom/exec/findtaskbypid.c

   1 /*
   2     Copyright © 1995-2014, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <exec/execbase.h>
   7 #include <exec/tasks.h>
   8
   9 /*****************************************************************************
  10
  11     NAME */
  12 #include <proto/exec.h>
  13
  14         AROS_LH1(struct Task *, FindTaskByPID,
  15
  16 /*  SYNOPSIS */
  17         AROS_LHA(ULONG, id, D0),
  18
  19 /*  LOCATION */
  20         struct ExecBase *, SysBase, 166, Exec)
  21
  22 /*  FUNCTION
  23         Scan through the task lists searching for the task whose
  24         et_UniqueID field matches.
  25
  26     INPUTS
  27         id      -   The task ID to match.
  28
  29     RESULT
  30         Address of the Task control structure that matches, or
  31         NULL otherwise.
  32
  33     NOTES
  34         This function is source-compatible with MorphOS.
  35
  36     EXAMPLE
  37
  38     BUGS
  39
  40     SEE ALSO
  41
  42     INTERNALS
  43
  44 ******************************************************************************/
  45 {
  46     AROS_LIBFUNC_INIT
  47
  48     struct Task *t;
  49     struct ETask *et;
  50
  51     /*
  52         First up, check ThisTask. It could be NULL because of exec_init.c
  53     */
  54     if (SysBase->ThisTask != NULL)
  55     {
  56         et = GetETask(SysBase->ThisTask);
  57         if (et != NULL && et->et_UniqueID == id)
  58             return SysBase->ThisTask;
  59     }
  60
  61     /*  Next, go through the ready list */
  62     ForeachNode(&SysBase->TaskReady, t)
  63     {
  64         et = GetETask(t);
  65         if (et != NULL && et->et_UniqueID == id)
  66             return t;
  67     }
  68
  69     /* Finally, go through the wait list */
  70     ForeachNode(&SysBase->TaskWait, t)
  71     {
  72         et = GetETask(t);
  73         if (et != NULL && et->et_UniqueID == id)
  74             return t;
  75     }
  76
  77     return NULL;
  78
  79     AROS_LIBFUNC_EXIT
  80 }