#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