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
|
#ifndef PREVENTSTANDBY_H_INCLUDED
#define PREVENTSTANDBY_H_INCLUDED
#ifdef FFS_WIN
#include "win.h" //includes "windows.h"
#elif defined FFS_LINUX
#endif
namespace zen
{
struct PreventStandby //signal a "busy" state to the operating system
{
#ifdef FFS_WIN
PreventStandby() { ::SetThreadExecutionState(ES_CONTINUOUS | ES_SYSTEM_REQUIRED /* | ES_AWAYMODE_REQUIRED*/ ); }
~PreventStandby() { ::SetThreadExecutionState(ES_CONTINUOUS); }
#endif
};
struct ScheduleForBackgroundProcessing //lower CPU and file I/O priorities
{
#ifdef FFS_WIN
#ifndef PROCESS_MODE_BACKGROUND_BEGIN
#define PROCESS_MODE_BACKGROUND_BEGIN 0x00100000 // Windows Server 2003 and Windows XP/2000: This value is not supported!
#define PROCESS_MODE_BACKGROUND_END 0x00200000 //
#endif
ScheduleForBackgroundProcessing() { ::SetPriorityClass(::GetCurrentProcess(), PROCESS_MODE_BACKGROUND_BEGIN); } //this call lowers CPU priority, too!!
~ScheduleForBackgroundProcessing() { ::SetPriorityClass(::GetCurrentProcess(), PROCESS_MODE_BACKGROUND_END); }
#elif defined FFS_LINUX
/*
CPU prio:
int getpriority(PRIO_PROCESS, 0); - errno caveat!
int ::setpriority(PRIO_PROCESS, 0, int prio); //a zero value for "who" denotes the calling process
priority can be decreased, but NOT increased :(
file I/O prio:
ScheduleForBackgroundProcessing() : oldIoPrio(::ioprio_get(IOPRIO_WHO_PROCESS, ::getpid()))
{
if (oldIoPrio != -1)
::ioprio_set(IOPRIO_WHO_PROCESS, ::getpid(), IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0));
}
~ScheduleForBackgroundProcessing()
{
if (oldIoPrio != -1)
::ioprio_set(IOPRIO_WHO_PROCESS, ::getpid(), oldIoPrio);
}
private:
const int oldIoPrio;
*/
#endif
};
}
#endif // PREVENTSTANDBY_H_INCLUDED
|
