55 lines
2.4 KiB
C
55 lines
2.4 KiB
C
/*****************************************************************************
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File: scheduler.h
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Description: Scheduling inquiry functions
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Copyright 1998-, Be Incorporated, All Rights Reserved.
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*****************************************************************************/
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#if !defined(SCHEDULER_H)
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#define SCHEDULER_H
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#include <SupportDefs.h>
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#include <OS.h>
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/* To get a good thread priority, call suggest_thread_priority() with the following information: */
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/* 'what' is a bit mask describing what you're doing in the thread. */
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/* 'period' is how many times a second your thread needs to run (-1 if you're running continuously.) */
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/* 'jitter' is an estimate (in us) of how much that period can vary, as long as it stays centered on the average. */
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/* 'length' is how long (in us) you expect to run for each invocation. */
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/* "invocation" means, typically, receiving a message, dispatching it, and then returning to reading a message. */
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/* MANIPULATION means both filtering and compression/decompression. */
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/* PLAYBACK and RECORDING means threads feeding/reading ACTUAL HARDWARE ONLY. */
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/* 0 means don't care */
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enum be_task_flags { /* bitmasks for "what" */
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B_DEFAULT_MEDIA_PRIORITY = 0,
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B_OFFLINE_PROCESSING = 0x1,
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B_STATUS_RENDERING = 0x2, /* can also use this for "preview" type things */
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B_USER_INPUT_HANDLING = 0x4,
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B_LIVE_VIDEO_MANIPULATION = 0x8, /* non-live processing is OFFLINE_PROCESSING */
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B_VIDEO_PLAYBACK = 0x10, /* feeding hardware */
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B_VIDEO_RECORDING = 0x20, /* grabbing from hardware */
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B_LIVE_AUDIO_MANIPULATION = 0x40, /* non-live processing is OFFLINE_PROCESSING */
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B_AUDIO_PLAYBACK = 0x80, /* feeding hardware */
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B_AUDIO_RECORDING = 0x100, /* grabbing from hardware */
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B_LIVE_3D_RENDERING = 0x200, /* non-live rendering is OFFLINE_PROCESSING */
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B_NUMBER_CRUNCHING = 0x400,
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B_MIDI_PROCESSING = 0x800
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};
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#if defined(__cplusplus)
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extern "C" {
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_IMPEXP_ROOT int32 suggest_thread_priority(uint32 task_flags = B_DEFAULT_MEDIA_PRIORITY,
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int32 period = 0, bigtime_t jitter = 0, bigtime_t length = 0);
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_IMPEXP_ROOT bigtime_t estimate_max_scheduling_latency(thread_id th = -1); /* default is current thread */
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}
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#else
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_IMPEXP_ROOT int32 suggest_thread_priority(uint32 what, int32 period, bigtime_t jitter, bigtime_t length);
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_IMPEXP_ROOT bigtime_t estimate_max_scheduling_latency(thread_id th); /* default is current thread */
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#endif
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#endif /* SCHEDULER_H */
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