summaryrefslogtreecommitdiff
path: root/src/lib/eina/eina_sched.c
blob: 891c02d260a8f06158cdaac736faff1484f04d00 (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
/* EINA - EFL data type library
 * Copyright (C) 2010 ProFUSION embedded systems
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library;
 * if not, see <http://www.gnu.org/licenses/>.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "eina_thread.h"

#ifdef __linux__
#include <sched.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <errno.h>
#endif

#include "eina_sched.h"
#include "eina_log.h"

#define RTNICENESS 1
#define NICENESS 5

EAPI void
eina_sched_prio_drop(void)
{
#ifndef _WIN32
   struct sched_param param;
   int pol, ret;
   Eina_Thread pthread_id;

   pthread_id = eina_thread_self();
   ret = pthread_getschedparam(pthread_id, &pol, &param);
   if (ret)
   {
      EINA_LOG_ERR("Unable to query sched parameters");
      return;
   }

   if (EINA_UNLIKELY(pol == SCHED_RR || pol == SCHED_FIFO))
   {
      param.sched_priority -= RTNICENESS;

      /* We don't change the policy */
      if (param.sched_priority < 1)
      {
         EINA_LOG_INFO("RT prio < 1, setting to 1 instead");
         param.sched_priority = 1;
      }

      pthread_setschedparam(pthread_id, pol, &param);
   }
#ifdef __linux__
   else
   {
      int prio;
      errno = 0;
      prio = getpriority(PRIO_PROCESS, 0);
      if (errno == 0)
      {
         prio += NICENESS;
         if (prio > 19)
         {
            EINA_LOG_INFO("Max niceness reached; keeping max (19)");
            prio = 19;
         }

         setpriority(PRIO_PROCESS, 0, prio);
      }
   }
#endif
#else
   Eina_Thread pthread_id;
   int sched_priority;

   pthread_id = eina_thread_self();

   sched_priority = GetThreadPriority((HANDLE)pthread_id);

   if (EINA_UNLIKELY(sched_priority == THREAD_PRIORITY_TIME_CRITICAL))
   {
      sched_priority -= RTNICENESS;

      /* We don't change the policy */
      if (sched_priority < 1)
      {
         EINA_LOG_INFO("RT prio < 1, setting to 1 instead");
         sched_priority = 1;
      }
      if (!SetThreadPriority((HANDLE)pthread_id, sched_priority))
      {
         EINA_LOG_ERR("Unable to query sched parameters");
      }
   }
   else
   {
      sched_priority += NICENESS;

      /* We don't change the policy */
      if (sched_priority > THREAD_PRIORITY_TIME_CRITICAL)
      {
         EINA_LOG_INFO("Max niceness reached; keeping max (THREAD_PRIORITY_TIME_CRITICAL)");
         sched_priority = THREAD_PRIORITY_TIME_CRITICAL;
      }
      if (!SetThreadPriority((HANDLE)pthread_id, sched_priority))
      {
         EINA_LOG_ERR("Unable to query sched parameters");
      }
   }
#endif
}