summaryrefslogtreecommitdiff
path: root/ace/Sched_Params.cpp
blob: 1b13a92f4355059b845b82a13760a75e384ba852 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
// $Id$

// ============================================================================
//
// = LIBRARY
//    ACE
//
// = FILENAME
//    Sched_Params.cpp
//
// = CREATION DATE
//    28 January 1997
//
// = AUTHOR
//    David Levine
//
// ============================================================================

#define ACE_BUILD_DLL

#include "ace/ACE.h"
#include "ace/Sched_Params.h"

#if !defined (__ACE_INLINE__)
#include "ace/Sched_Params.i"
#endif /* __ACE_INLINE__ */

#if defined (ACE_HAS_STHREADS)
#include <sys/rtpriocntl.h>
#include <sys/tspriocntl.h>
#endif /* ACE_HAS_STHREADS */

int
ACE_Sched_Params::priority_min (const Policy policy)
{
#if defined (ACE_HAS_STHREADS)
  // Assume that ACE_SCHED_OTHER indicates Solaris TS class, and that
  // other policies indicate Solaris RT class.

  if (policy == ACE_SCHED_OTHER)
    {
      // Get the priority class ID and attributes.
      pcinfo_t pcinfo;
      ACE_OS::strcpy (pcinfo.pc_clname, "TS");
      // The following is just to avoid Purify warnings about unitialized
      // memory reads.
      ACE_OS::memset (pcinfo.pc_clinfo, 0, PC_CLINFOSZ);

      if (::priocntl (P_ALL /* ignored */,
                      P_MYID /* ignored */,
                      PC_GETCID,
                      (char *) &pcinfo) == -1)
        {
          return -1;  // just hope that priority range wasn't configured
                      // from -1 .. 1
        }

      // OK, now we've got the class ID in pcinfo.pc_cid.  In addition,
      // the maximum configured real-time priority is in ((tsinfo_t *)
      // pcinfo.pc_clinfo)->ts_maxupri.

      return -((tsinfo_t *) pcinfo.pc_clinfo)->ts_maxupri;
    }
  else
    {
      return 0;
    }
#elif defined (ACE_HAS_DCETHREADS) || defined(ACE_HAS_PTHREADS)
  return ::sched_get_priority_min (policy);
#elif defined (ACE_HAS_WTHREADS)
  return THREAD_PRIORITY_IDLE;
#elif defined (VXWORKS)
  return 255;
#elif
  ACE_NOTSUP_RETURN (-1);
#endif /* ACE_HAS_STHREADS */
}

int
ACE_Sched_Params::priority_max (const Policy policy)
{
#if defined (ACE_HAS_STHREADS)
  // Assume that ACE_SCHED_OTHER indicates Solaris TS class, and that
  // other policies indicate Solaris RT class.

  // Get the priority class ID and attributes.
  pcinfo_t pcinfo;
  ACE_OS::strcpy (pcinfo.pc_clname,
                  policy == ACE_SCHED_OTHER  ?  "TS"  :  "RT");
  // The following is just to avoid Purify warnings about unitialized
  // memory reads.
  ACE_OS::memset (pcinfo.pc_clinfo, 0, PC_CLINFOSZ);

  if (::priocntl (P_ALL /* ignored */,
                  P_MYID /* ignored */,
                  PC_GETCID,
                  (char *) &pcinfo) == -1)
    {
      return -1;
    }

  // OK, now we've got the class ID in pcinfo.pc_cid.  In addition,
  // the maximum configured real-time priority is in ((rtinfo_t *)
  // pcinfo.pc_clinfo)->rt_maxpri, or similarly for the TS class.

  return policy == ACE_SCHED_OTHER
      ? ((tsinfo_t *) pcinfo.pc_clinfo)->ts_maxupri
      : ((rtinfo_t *) pcinfo.pc_clinfo)->rt_maxpri;
#elif defined (ACE_HAS_DCETHREADS) || defined(ACE_HAS_PTHREADS)
  return ::sched_get_priority_max (policy);
#elif defined (ACE_HAS_WTHREADS)
  return THREAD_PRIORITY_TIME_CRITICAL;
#elif defined (VXWORKS)
  return 0;
#elif
  ACE_NOTSUP_RETURN (-1);
#endif /* ACE_HAS_STHREADS */
}

int
ACE_Sched_Params::next_priority (const Policy policy, const int priority)
{
#if defined (VXWORKS)
  ACE_UNUSED_ARG (policy);
  return priority > priority_max (policy)  ?  priority - 1
                                           :  priority_max (policy);
#elif defined (ACE_HAS_THREADS)
  const int max = priority_max (policy);
  return priority < max  ?  priority + 1  :  max;
#elif
  ACE_NOTSUP_RETURN (-1);
#endif /* ACE_HAS_THREADS */
}

int
ACE_Sched_Params::previous_priority (const Policy policy,
                                          const int priority)
{
#if defined (VXWORKS)
  ACE_UNUSED_ARG (policy);
  return priority < priority_min (policy)  ?  priority + 1
                                           :  priority_min (policy);
#elif defined (ACE_HAS_THREADS)
  const int min = priority_min (policy);
  return priority > min  ?  priority - 1  :  min;
#elif
  ACE_NOTSUP_RETURN (-1);
#endif /* ACE_HAS_THREADS */
}