gr_block Class Reference

The abstract base class for all 'terminal' processing blocks.A signal processing flow is constructed by creating a tree of hierarchical blocks, which at any level may also contain terminal nodes that actually implement signal processing functions. This is the base class for all such leaf nodes. More...

#include <gr_block.h>

Inheritance diagram for gr_block:

List of all members.

Public Types
enum	{ WORK_CALLED_PRODUCE = -2, WORK_DONE = -1 }
	Magic return values from general_work. More...
enum	tag_propagation_policy_t { TPP_DONT = 0, TPP_ALL_TO_ALL = 1, TPP_ONE_TO_ONE = 2 }
Public Member Functions
virtual	~gr_block ()
unsigned	history () const
void	set_history (unsigned history)
bool	fixed_rate () const
	Return true if this block has a fixed input to output rate.
virtual void	forecast (int noutput_items, gr_vector_int &ninput_items_required)
	Estimate input requirements given output request.
virtual int	general_work (int noutput_items, gr_vector_int &ninput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
	compute output items from input items
virtual bool	start ()
	Called to enable drivers, etc for i/o devices.
virtual bool	stop ()
	Called to disable drivers, etc for i/o devices.
void	set_output_multiple (int multiple)
	Constrain the noutput_items argument passed to forecast and general_work.
int	output_multiple () const
bool	output_multiple_set () const
void	set_alignment (int multiple)
	Constrains buffers to work on a set item alignment (for SIMD)
int	alignment () const
void	set_unaligned (int na)
int	unaligned () const
void	set_is_unaligned (bool u)
bool	is_unaligned () const
void	consume (int which_input, int how_many_items)
	Tell the scheduler how_many_items of input stream which_input were consumed.
void	consume_each (int how_many_items)
	Tell the scheduler how_many_items were consumed on each input stream.
void	produce (int which_output, int how_many_items)
	Tell the scheduler how_many_items were produced on output stream which_output.
void	set_relative_rate (double relative_rate)
	Set the approximate output rate / input rate.
double	relative_rate () const
	return the approximate output rate / input rate
virtual int	fixed_rate_ninput_to_noutput (int ninput)
	Given ninput samples, return number of output samples that will be produced. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this.
virtual int	fixed_rate_noutput_to_ninput (int noutput)
	Given noutput samples, return number of input samples required to produce noutput. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this.
uint64_t	nitems_read (unsigned int which_input)
	Return the number of items read on input stream which_input.
uint64_t	nitems_written (unsigned int which_output)
	Return the number of items written on output stream which_output.
tag_propagation_policy_t	tag_propagation_policy ()
	Asks for the policy used by the scheduler to moved tags downstream.
void	set_tag_propagation_policy (tag_propagation_policy_t p)
	Set the policy by the scheduler to determine how tags are moved downstream.
int	min_noutput_items () const
	Return the minimum number of output items this block can produce during a call to work.
void	set_min_noutput_items (int m)
	Set the minimum number of output items this block can produce during a call to work.
int	max_noutput_items ()
	Return the maximum number of output items this block will handle during a call to work.
void	set_max_noutput_items (int m)
	Set the maximum number of output items this block will handle during a call to work.
void	unset_max_noutput_items ()
	Clear the switch for using the max_noutput_items value of this block.
bool	is_set_max_noutput_items ()
	Ask the block if the flag is or is not set to use the internal value of max_noutput_items during a call to work.
void	expand_minmax_buffer (int port)
long	max_output_buffer (size_t i)
	Returns max buffer size on output port i.
void	set_max_output_buffer (long max_output_buffer)
	Sets max buffer size on all output ports.
void	set_max_output_buffer (int port, long max_output_buffer)
	Sets max buffer size on output port port.
long	min_output_buffer (size_t i)
	Returns min buffer size on output port i.
void	set_min_output_buffer (long min_output_buffer)
	Sets min buffer size on all output ports.
void	set_min_output_buffer (int port, long min_output_buffer)
	Sets min buffer size on output port port.
float	pc_noutput_items ()
	Gets average noutput_items performance counter.
float	pc_noutput_items_var ()
	Gets variance of noutput_items performance counter.
float	pc_nproduced ()
	Gets average num items produced performance counter.
float	pc_nproduced_var ()
	Gets variance of num items produced performance counter.
float	pc_input_buffers_full (int which)
	Gets average fullness of which input buffer.
float	pc_input_buffers_full_var (int which)
	Gets variance of fullness of which input buffer.
std::vector< float >	pc_input_buffers_full ()
	Gets average fullness of all input buffers.
std::vector< float >	pc_input_buffers_full_var ()
	Gets variance of fullness of all input buffers.
float	pc_output_buffers_full (int which)
	Gets average fullness of which input buffer.
float	pc_output_buffers_full_var (int which)
	Gets variance of fullness of which input buffer.
std::vector< float >	pc_output_buffers_full ()
	Gets average fullness of all output buffers.
std::vector< float >	pc_output_buffers_full_var ()
	Gets variance of fullness of all output buffers.
float	pc_work_time ()
	Gets average clock cycles spent in work.
float	pc_work_time_var ()
	Gets average clock cycles spent in work.
void	reset_perf_counters ()
	Resets the performance counters.
void	set_processor_affinity (const std::vector< int > &mask)
	Set the thread's affinity to processor core n.
void	unset_processor_affinity ()
	Remove processor affinity to a specific core.
std::vector< int >	processor_affinity ()
	Get the current processor affinity.
gr_block_detail_sptr	detail () const
void	set_detail (gr_block_detail_sptr detail)
Protected Member Functions
	gr_block (void)
	gr_block (const std::string &name, gr_io_signature_sptr input_signature, gr_io_signature_sptr output_signature)
void	set_fixed_rate (bool fixed_rate)
void	add_item_tag (unsigned int which_output, uint64_t abs_offset, const pmt::pmt_t &key, const pmt::pmt_t &value, const pmt::pmt_t &srcid=pmt::PMT_F)
	Adds a new tag onto the given output buffer.
void	add_item_tag (unsigned int which_output, const gr_tag_t &tag)
	Adds a new tag onto the given output buffer.
void	remove_item_tag (unsigned int which_input, uint64_t abs_offset, const pmt::pmt_t &key, const pmt::pmt_t &value, const pmt::pmt_t &srcid=pmt::PMT_F)
	Removes a tag from the given input buffer.
void	remove_item_tag (unsigned int which_input, const gr_tag_t &tag)
	Removes a tag from the given input buffer.
void	get_tags_in_range (std::vector< gr_tag_t > &v, unsigned int which_input, uint64_t abs_start, uint64_t abs_end)
	Given a [start,end), returns a vector of all tags in the range.
void	get_tags_in_range (std::vector< gr_tag_t > &v, unsigned int which_input, uint64_t abs_start, uint64_t abs_end, const pmt::pmt_t &key)
	Given a [start,end), returns a vector of all tags in the range with a given key.
Protected Attributes
std::vector< long >	d_max_output_buffer
std::vector< long >	d_min_output_buffer
gruel::mutex	d_setlock
gr_logger_ptr	d_logger
gr_logger_ptr	d_debug_logger

---

Detailed Description

The abstract base class for all 'terminal' processing blocks.

A signal processing flow is constructed by creating a tree of hierarchical blocks, which at any level may also contain terminal nodes that actually implement signal processing functions. This is the base class for all such leaf nodes.

Blocks have a set of input streams and output streams. The input_signature and output_signature define the number of input streams and output streams respectively, and the type of the data items in each stream.

Although blocks may consume data on each input stream at a different rate, all outputs streams must produce data at the same rate. That rate may be different from any of the input rates.

User derived blocks override two methods, forecast and general_work, to implement their signal processing behavior. forecast is called by the system scheduler to determine how many items are required on each input stream in order to produce a given number of output items.

general_work is called to perform the signal processing in the block. It reads the input items and writes the output items.

---

Member Enumeration Documentation

anonymous enum

Magic return values from general_work.

Enumerator:

WORK_CALLED_PRODUCE
WORK_DONE

enum gr_block::tag_propagation_policy_t

Enumerator:

TPP_DONT
TPP_ALL_TO_ALL
TPP_ONE_TO_ONE

---

Constructor & Destructor Documentation

virtual gr_block::~gr_block

(

)

[virtual]

gr_block::gr_block

(

void

)

[inline, protected]

gr_block::gr_block	(	const std::string &	name,
		gr_io_signature_sptr	input_signature,
		gr_io_signature_sptr	output_signature
	)		[protected]

---

Member Function Documentation

void gr_block::add_item_tag	(	unsigned int	which_output,
		uint64_t	abs_offset,
		const pmt::pmt_t &	key,
		const pmt::pmt_t &	value,
		const pmt::pmt_t &	srcid = pmt::PMT_F
	)		[inline, protected]

Adds a new tag onto the given output buffer.

Parameters:

which_output	an integer of which output stream to attach the tag
abs_offset	a uint64 number of the absolute item number assicated with the tag. Can get from nitems_written.
key	the tag key as a PMT symbol
value	any PMT holding any value for the given key
srcid	optional source ID specifier; defaults to PMT_F

References gr_tag_t::key, gr_tag_t::offset, gr_tag_t::srcid, and gr_tag_t::value.

Referenced by gr_block_gateway::gr_block__add_item_tag(), tag_source_demo::make_eob_tag(), tag_source_demo::make_sob_tag(), and tag_source_demo::make_time_tag().

void gr_block::add_item_tag	(	unsigned int	which_output,
		const gr_tag_t &	tag
	)		[protected]

Adds a new tag onto the given output buffer.

Parameters:

which_output	an integer of which output stream to attach the tag
tag	the tag object to add

int gr_block::alignment

(

)

const [inline]

void gr_block::consume	(	int	which_input,
		int	how_many_items
	)

Tell the scheduler how_many_items of input stream which_input were consumed.

Referenced by gr_block_gateway::gr_block__consume().

void gr_block::consume_each

(

int

how_many_items

)

Tell the scheduler how_many_items were consumed on each input stream.

Referenced by gr_block_gateway::gr_block__consume_each().

gr_block_detail_sptr gr_block::detail

(

)

const [inline]

void gr_block::expand_minmax_buffer

(

int

port

)

[inline]

bool gr_block::fixed_rate

(

)

const [inline]

Return true if this block has a fixed input to output rate.

If true, then fixed_rate_in_to_out and fixed_rate_out_to_in may be called.

Referenced by gr_block_gateway::gr_block__fixed_rate().

virtual int gr_block::fixed_rate_ninput_to_noutput

(

int

ninput

)

[virtual]

Given ninput samples, return number of output samples that will be produced. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this.

Reimplemented in gr_test, gr_sync_block, gr_sync_decimator, and gr_sync_interpolator.

virtual int gr_block::fixed_rate_noutput_to_ninput

(

int

noutput

)

[virtual]

Given noutput samples, return number of input samples required to produce noutput. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this.

Reimplemented in gr_test, gr_sync_block, gr_sync_decimator, and gr_sync_interpolator.

virtual void gr_block::forecast	(	int	noutput_items,
		gr_vector_int &	ninput_items_required
	)		[virtual]

Estimate input requirements given output request.

Parameters:

noutput_items	number of output items to produce
ninput_items_required	number of input items required on each input stream

Given a request to product noutput_items, estimate the number of data items required on each input stream. The estimate doesn't have to be exact, but should be close.

Reimplemented in gr_fractional_interpolator_cc, gr_fractional_interpolator_ff, gr_align_on_samplenumbers_ss, gr_keep_m_in_n, gr_simple_framer, gr_stream_mux, gr_test, gr_sync_block, gr_sync_decimator, gr_sync_interpolator, gr_tagged_stream_block, atsc_bit_timing_loop, atsc_equalizer, atsc_field_sync_demux, atsc_field_sync_mux, atsc_pad, gr::blocks::copy_impl, gr::blocks::patterned_interleaver_impl, digital_clock_recovery_mm_cc, digital_clock_recovery_mm_ff, digital_constellation_decoder_cb, digital_mpsk_receiver_cc, digital_ofdm_chanest_vcvc, digital_ofdm_insert_preamble, digital_ofdm_sampler, digital_simple_framer, gr::digital::header_payload_demux_impl, gr::filter::fractional_interpolator_cc_impl, gr::filter::fractional_interpolator_ff_impl, gr::filter::fractional_resampler_cc_impl, gr::filter::fractional_resampler_ff_impl, pager_flex_sync, trellis_constellation_metrics_cf, trellis_siso_combined_f, trellis_siso_f, gr_rational_resampler_base_ccc, gr_rational_resampler_base_ccf, gr_rational_resampler_base_fcc, gr_rational_resampler_base_fff, gr_rational_resampler_base_fsf, gr_rational_resampler_base_scc, gr_packed_to_unpacked_bb, gr_packed_to_unpacked_ii, gr_packed_to_unpacked_ss, gr_unpacked_to_packed_bb, gr_unpacked_to_packed_ii, gr_unpacked_to_packed_ss, gr::blocks::packed_to_unpacked_bb_impl, gr::blocks::packed_to_unpacked_ii_impl, gr::blocks::packed_to_unpacked_ss_impl, gr::blocks::unpacked_to_packed_bb_impl, gr::blocks::unpacked_to_packed_ii_impl, gr::blocks::unpacked_to_packed_ss_impl, gr::filter::rational_resampler_base_ccc_impl, gr::filter::rational_resampler_base_ccf_impl, gr::filter::rational_resampler_base_fcc_impl, gr::filter::rational_resampler_base_fff_impl, gr::filter::rational_resampler_base_fsf_impl, gr::filter::rational_resampler_base_scc_impl, trellis_metrics_c, trellis_metrics_f, trellis_metrics_i, trellis_metrics_s, trellis_pccc_decoder_b, trellis_pccc_decoder_combined_cb, trellis_pccc_decoder_combined_ci, trellis_pccc_decoder_combined_cs, trellis_pccc_decoder_combined_fb, trellis_pccc_decoder_combined_fi, trellis_pccc_decoder_combined_fs, trellis_pccc_decoder_i, trellis_pccc_decoder_s, trellis_sccc_decoder_b, trellis_sccc_decoder_combined_cb, trellis_sccc_decoder_combined_ci, trellis_sccc_decoder_combined_cs, trellis_sccc_decoder_combined_fb, trellis_sccc_decoder_combined_fi, trellis_sccc_decoder_combined_fs, trellis_sccc_decoder_i, trellis_sccc_decoder_s, trellis_viterbi_b, trellis_viterbi_combined_cb, trellis_viterbi_combined_ci, trellis_viterbi_combined_cs, trellis_viterbi_combined_fb, trellis_viterbi_combined_fi, trellis_viterbi_combined_fs, trellis_viterbi_combined_ib, trellis_viterbi_combined_ii, trellis_viterbi_combined_is, trellis_viterbi_combined_sb, trellis_viterbi_combined_si, trellis_viterbi_combined_ss, trellis_viterbi_i, and trellis_viterbi_s.

virtual int gr_block::general_work	(	int	noutput_items,
		gr_vector_int &	ninput_items,
		gr_vector_const_void_star &	input_items,
		gr_vector_void_star &	output_items
	)		[virtual]

compute output items from input items

Parameters:

noutput_items	number of output items to write on each output stream
ninput_items	number of input items available on each input stream
input_items	vector of pointers to the input items, one entry per input stream
output_items	vector of pointers to the output items, one entry per output stream

Returns:

number of items actually written to each output stream, or -1 on EOF. It is OK to return a value less than noutput_items. -1 <= return value <= noutput_items

general_work must call consume or consume_each to indicate how many items were consumed on each input stream.

Reimplemented in gr_fractional_interpolator_cc, gr_fractional_interpolator_ff, gr_pfb_arb_resampler_ccf, gr_pfb_arb_resampler_fff, gr_pfb_channelizer_ccf, gr_pfb_clock_sync_ccf, gr_pfb_clock_sync_fff, gr_align_on_samplenumbers_ss, gr_copy, gr_delay, gr_keep_m_in_n, gr_keep_one_in_n, gr_nop, gr_ofdm_bpsk_demapper, gr_simple_correlator, gr_simple_framer, gr_skiphead, gr_squelch_base_cc, gr_squelch_base_ff, gr_stream_mux, gr_test, gr_sync_block, gr_sync_decimator, gr_sync_interpolator, gr_tagged_stream_block, gr::analog::ctcss_squelch_ff_impl, gr::analog::pwr_squelch_cc_impl, gr::analog::pwr_squelch_ff_impl, gr::analog::squelch_base_cc_impl, gr::analog::squelch_base_ff_impl, atsc_bit_timing_loop, atsc_field_sync_demux, gr::blocks::copy_impl, gr::blocks::delay_impl, gr::blocks::keep_m_in_n_impl, gr::blocks::keep_one_in_n_impl, gr::blocks::nop_impl, gr::blocks::patterned_interleaver_impl, gr::blocks::skiphead_impl, gr::blocks::stream_mux_impl, digital_clock_recovery_mm_cc, digital_clock_recovery_mm_ff, digital_constellation_decoder_cb, digital_constellation_receiver_cb, digital_mpsk_receiver_cc, digital_ofdm_chanest_vcvc, digital_ofdm_frame_acquisition, digital_ofdm_insert_preamble, digital_ofdm_sampler, digital_pfb_clock_sync_ccf, digital_pfb_clock_sync_fff, digital_simple_correlator, digital_simple_framer, gr::digital::header_payload_demux_impl, gr::filter::fractional_interpolator_cc_impl, gr::filter::fractional_interpolator_ff_impl, gr::filter::fractional_resampler_cc_impl, gr::filter::fractional_resampler_ff_impl, gr::filter::pfb_arb_resampler_ccf_impl, gr::filter::pfb_arb_resampler_fff_impl, gr::filter::pfb_channelizer_ccf_impl, noaa_hrpt_deframer, pager_flex_sync, qtgui_sink_c, qtgui_sink_f, trellis_constellation_metrics_cf, trellis_siso_combined_f, trellis_siso_f, gr_rational_resampler_base_ccc, gr_rational_resampler_base_ccf, gr_rational_resampler_base_fcc, gr_rational_resampler_base_fff, gr_rational_resampler_base_fsf, gr_rational_resampler_base_scc, gr_packed_to_unpacked_bb, gr_packed_to_unpacked_ii, gr_packed_to_unpacked_ss, gr_unpacked_to_packed_bb, gr_unpacked_to_packed_ii, gr_unpacked_to_packed_ss, gr_vector_insert_b, gr::blocks::packed_to_unpacked_bb_impl, gr::blocks::packed_to_unpacked_ii_impl, gr::blocks::packed_to_unpacked_ss_impl, gr::blocks::unpacked_to_packed_bb_impl, gr::blocks::unpacked_to_packed_ii_impl, gr::blocks::unpacked_to_packed_ss_impl, gr::blocks::vector_insert_b_impl, gr::blocks::vector_insert_c_impl, gr::blocks::vector_insert_f_impl, gr::blocks::vector_insert_i_impl, gr::blocks::vector_insert_s_impl, gr::filter::rational_resampler_base_ccc_impl, gr::filter::rational_resampler_base_ccf_impl, gr::filter::rational_resampler_base_fcc_impl, gr::filter::rational_resampler_base_fff_impl, gr::filter::rational_resampler_base_fsf_impl, gr::filter::rational_resampler_base_scc_impl, trellis_metrics_c, trellis_metrics_f, trellis_metrics_i, trellis_metrics_s, trellis_pccc_decoder_b, trellis_pccc_decoder_combined_cb, trellis_pccc_decoder_combined_ci, trellis_pccc_decoder_combined_cs, trellis_pccc_decoder_combined_fb, trellis_pccc_decoder_combined_fi, trellis_pccc_decoder_combined_fs, trellis_pccc_decoder_i, trellis_pccc_decoder_s, trellis_sccc_decoder_b, trellis_sccc_decoder_combined_cb, trellis_sccc_decoder_combined_ci, trellis_sccc_decoder_combined_cs, trellis_sccc_decoder_combined_fb, trellis_sccc_decoder_combined_fi, trellis_sccc_decoder_combined_fs, trellis_sccc_decoder_i, trellis_sccc_decoder_s, trellis_viterbi_b, trellis_viterbi_combined_cb, trellis_viterbi_combined_ci, trellis_viterbi_combined_cs, trellis_viterbi_combined_fb, trellis_viterbi_combined_fi, trellis_viterbi_combined_fs, trellis_viterbi_combined_ib, trellis_viterbi_combined_ii, trellis_viterbi_combined_is, trellis_viterbi_combined_sb, trellis_viterbi_combined_si, trellis_viterbi_combined_ss, trellis_viterbi_i, and trellis_viterbi_s.

void gr_block::get_tags_in_range	(	std::vector< gr_tag_t > &	v,
		unsigned int	which_input,
		uint64_t	abs_start,
		uint64_t	abs_end,
		const pmt::pmt_t &	key
	)		[protected]

Given a [start,end), returns a vector of all tags in the range with a given key.

Range of counts is from start to end-1.

Tags are tuples of: (item count, source id, key, value)

Parameters:

v	a vector reference to return tags into
which_input	an integer of which input stream to pull from
abs_start	a uint64 count of the start of the range of interest
abs_end	a uint64 count of the end of the range of interest
key	a PMT symbol key to filter only tags of this key

void gr_block::get_tags_in_range	(	std::vector< gr_tag_t > &	v,
		unsigned int	which_input,
		uint64_t	abs_start,
		uint64_t	abs_end
	)		[protected]

Given a [start,end), returns a vector of all tags in the range.

Range of counts is from start to end-1.

Tags are tuples of: (item count, source id, key, value)

Parameters:

v	a vector reference to return tags into
which_input	an integer of which input stream to pull from
abs_start	a uint64 count of the start of the range of interest
abs_end	a uint64 count of the end of the range of interest

Referenced by gr_block_gateway::gr_block__get_tags_in_range(), and tag_sink_demo::work().

unsigned gr_block::history

(

)

const [inline]

Assume block computes y_i = f(x_i, x_i-1, x_i-2, x_i-3...) History is the number of x_i's that are examined to produce one y_i. This comes in handy for FIR filters, where we use history to ensure that our input contains the appropriate "history" for the filter. History should be equal to the number of filter taps.

Reimplemented in gr_rational_resampler_base_ccc, gr_rational_resampler_base_ccf, gr_rational_resampler_base_fcc, gr_rational_resampler_base_fff, gr_rational_resampler_base_fsf, gr_rational_resampler_base_scc, gr::filter::rational_resampler_base_ccc_impl, gr::filter::rational_resampler_base_ccf_impl, gr::filter::rational_resampler_base_fcc_impl, gr::filter::rational_resampler_base_fff_impl, gr::filter::rational_resampler_base_fsf_impl, and gr::filter::rational_resampler_base_scc_impl.

Referenced by gr_delay::delay(), gr::blocks::delay_impl::dly(), gr_test::forecast(), gr_block_gateway::gr_block__history(), gr_rational_resampler_base_scc::set_history(), gr_rational_resampler_base_fsf::set_history(), gr_rational_resampler_base_fff::set_history(), gr_rational_resampler_base_fcc::set_history(), gr_rational_resampler_base_ccf::set_history(), and gr_rational_resampler_base_ccc::set_history().

bool gr_block::is_set_max_noutput_items

(

)

Ask the block if the flag is or is not set to use the internal value of max_noutput_items during a call to work.

bool gr_block::is_unaligned

(

)

const [inline]

int gr_block::max_noutput_items

(

)

Return the maximum number of output items this block will handle during a call to work.

long gr_block::max_output_buffer

(

size_t

i

)

[inline]

Returns max buffer size on output port i.

int gr_block::min_noutput_items

(

)

const [inline]

Return the minimum number of output items this block can produce during a call to work.

Should be 0 for most blocks. Useful if we're dealing with packets and the block produces one packet per call to work.

long gr_block::min_output_buffer

(

size_t

i

)

[inline]

Returns min buffer size on output port i.

uint64_t gr_block::nitems_read

(

unsigned int

which_input

)

Return the number of items read on input stream which_input.

Referenced by gr_block_gateway::gr_block__nitems_read(), and tag_sink_demo::work().

uint64_t gr_block::nitems_written

(

unsigned int

which_output

)

Return the number of items written on output stream which_output.

Referenced by gr_block_gateway::gr_block__nitems_written(), and tag_source_demo::work().

int gr_block::output_multiple

(

)

const [inline]

Referenced by gr_block_gateway::gr_block__output_multiple().

bool gr_block::output_multiple_set

(

)

const [inline]

float gr_block::pc_input_buffers_full

(

int

which

)

Gets average fullness of which input buffer.

std::vector<float> gr_block::pc_input_buffers_full

(

)

Gets average fullness of all input buffers.

float gr_block::pc_input_buffers_full_var

(

int

which

)

Gets variance of fullness of which input buffer.

std::vector<float> gr_block::pc_input_buffers_full_var

(

)

Gets variance of fullness of all input buffers.

float gr_block::pc_noutput_items

(

)

Gets average noutput_items performance counter.

float gr_block::pc_noutput_items_var

(

)

Gets variance of noutput_items performance counter.

float gr_block::pc_nproduced

(

)

Gets average num items produced performance counter.

float gr_block::pc_nproduced_var

(

)

Gets variance of num items produced performance counter.

float gr_block::pc_output_buffers_full

(

int

which

)

Gets average fullness of which input buffer.

std::vector<float> gr_block::pc_output_buffers_full

(

)

Gets average fullness of all output buffers.

float gr_block::pc_output_buffers_full_var

(

int

which

)

Gets variance of fullness of which input buffer.

std::vector<float> gr_block::pc_output_buffers_full_var

(

)

Gets variance of fullness of all output buffers.

float gr_block::pc_work_time

(

)

Gets average clock cycles spent in work.

float gr_block::pc_work_time_var

(

)

Gets average clock cycles spent in work.

std::vector<int> gr_block::processor_affinity

(

)

[inline]

Get the current processor affinity.

void gr_block::produce	(	int	which_output,
		int	how_many_items
	)

Tell the scheduler how_many_items were produced on output stream which_output.

If the block's general_work method calls produce, general_work must return WORK_CALLED_PRODUCE.

Referenced by gr_block_gateway::gr_block__produce().

double gr_block::relative_rate

(

)

const [inline]

return the approximate output rate / input rate

Referenced by gr_test::fixed_rate_ninput_to_noutput(), gr_test::fixed_rate_noutput_to_ninput(), gr_test::forecast(), and gr_block_gateway::gr_block__relative_rate().

void gr_block::remove_item_tag	(	unsigned int	which_input,
		const gr_tag_t &	tag
	)		[protected]

Removes a tag from the given input buffer.

If no such tag is found, does nothing.

Parameters:

which_input	an integer of which input stream to remove the tag from
tag	the tag object to remove

void gr_block::remove_item_tag	(	unsigned int	which_input,
		uint64_t	abs_offset,
		const pmt::pmt_t &	key,
		const pmt::pmt_t &	value,
		const pmt::pmt_t &	srcid = pmt::PMT_F
	)		[inline, protected]

Removes a tag from the given input buffer.

Parameters:

which_input	an integer of which input stream to remove the tag from
abs_offset	a uint64 number of the absolute item number assicated with the tag. Can get from nitems_written.
key	the tag key as a PMT symbol
value	any PMT holding any value for the given key
srcid	optional source ID specifier; defaults to PMT_F

If no such tag is found, does nothing.

References gr_tag_t::key, gr_tag_t::offset, gr_tag_t::srcid, and gr_tag_t::value.

void gr_block::reset_perf_counters

(

)

Resets the performance counters.

void gr_block::set_alignment

(

int

multiple

)

Constrains buffers to work on a set item alignment (for SIMD)

set_alignment_multiple causes the scheduler to ensure that the noutput_items argument passed to forecast and general_work will be an integer multiple of

Parameters:

multiple

The default value is 1.

This control is similar to the output_multiple setting, except that if the number of items passed to the block is less than the output_multiple, this value is ignored and the block can produce like normal. The d_unaligned value is set to the number of items the block is off by. In the next call to general_work, the noutput_items is set to d_unaligned or less until d_unaligned==0. The buffers are now aligned again and the aligned calls can be performed again.

void gr_block::set_detail

(

gr_block_detail_sptr

detail

)

[inline]

void gr_block::set_fixed_rate

(

bool

fixed_rate

)

[inline, protected]

Referenced by gr_block_gateway::gr_block__set_fixed_rate(), and gr_test::set_fixed_rate_public().

void gr_block::set_history

(

unsigned

history

)

[inline]

Reimplemented in gr_rational_resampler_base_ccc, gr_rational_resampler_base_ccf, gr_rational_resampler_base_fcc, gr_rational_resampler_base_fff, gr_rational_resampler_base_fsf, gr_rational_resampler_base_scc, gr::filter::rational_resampler_base_ccc_impl, gr::filter::rational_resampler_base_ccf_impl, gr::filter::rational_resampler_base_fcc_impl, gr::filter::rational_resampler_base_fff_impl, gr::filter::rational_resampler_base_fsf_impl, and gr::filter::rational_resampler_base_scc_impl.

Referenced by gr_block_gateway::gr_block__set_history().

void gr_block::set_is_unaligned

(

bool

u

)

void gr_block::set_max_noutput_items

(

int

m

)

Set the maximum number of output items this block will handle during a call to work.

Parameters:

m	the maximum noutput_items this block will handle.

void gr_block::set_max_output_buffer

(

long

max_output_buffer

)

[inline]

Sets max buffer size on all output ports.

References gr_basic_block::output_signature().

void gr_block::set_max_output_buffer	(	int	port,
		long	max_output_buffer
	)		[inline]

Sets max buffer size on output port port.

void gr_block::set_min_noutput_items

(

int

m

)

[inline]

Set the minimum number of output items this block can produce during a call to work.

Parameters:

m	the minimum noutput_items this block can produce.

void gr_block::set_min_output_buffer

(

long

min_output_buffer

)

[inline]

Sets min buffer size on all output ports.

References gr_basic_block::output_signature().

void gr_block::set_min_output_buffer	(	int	port,
		long	min_output_buffer
	)		[inline]

Sets min buffer size on output port port.

void gr_block::set_output_multiple

(

int

multiple

)

Constrain the noutput_items argument passed to forecast and general_work.

set_output_multiple causes the scheduler to ensure that the noutput_items argument passed to forecast and general_work will be an integer multiple of

Parameters:

multiple

The default value of output multiple is 1.

Referenced by gr_block_gateway::gr_block__set_output_multiple(), and gr_sync_interpolator::set_interpolation().

void gr_block::set_processor_affinity

(

const std::vector< int > &

mask

)

Set the thread's affinity to processor core n.

Parameters:

mask	a vector of ints of the core numbers available to this block.

void gr_block::set_relative_rate

(

double

relative_rate

)

Set the approximate output rate / input rate.

Provide a hint to the buffer allocator and scheduler. The default relative_rate is 1.0

decimators have relative_rates < 1.0 interpolators have relative_rates > 1.0

Referenced by gr_block_gateway::gr_block__set_relative_rate(), gr_sync_decimator::set_decimation(), gr_sync_interpolator::set_interpolation(), gr_pfb_arb_resampler_fff::set_rate(), and gr_pfb_arb_resampler_ccf::set_rate().

void gr_block::set_tag_propagation_policy

(

tag_propagation_policy_t

p

)

Set the policy by the scheduler to determine how tags are moved downstream.

Referenced by gr_block_gateway::gr_block__set_tag_propagation_policy().

void gr_block::set_unaligned

(

int

na

)

virtual bool gr_block::start

(

)

[virtual]

Called to enable drivers, etc for i/o devices.

This allows a block to enable an associated driver to begin transfering data just before we start to execute the scheduler. The end result is that this reduces latency in the pipeline when dealing with audio devices, usrps, etc.

Reimplemented in gr_random_pdu, audio_osx_sink, audio_osx_source, gr::blocks::probe_rate, and gr::blocks::probe_rate_impl.

virtual bool gr_block::stop

(

)

[virtual]

Called to disable drivers, etc for i/o devices.

Reimplemented in audio_osx_sink, audio_osx_source, gr::blocks::probe_rate, and gr::blocks::probe_rate_impl.

tag_propagation_policy_t gr_block::tag_propagation_policy

(

)

Asks for the policy used by the scheduler to moved tags downstream.

Referenced by gr_block_gateway::gr_block__tag_propagation_policy().

int gr_block::unaligned

(

)

const [inline]

void gr_block::unset_max_noutput_items

(

)

Clear the switch for using the max_noutput_items value of this block.

When is_set_max_noutput_items() returns 'true', the scheduler will use the value returned by max_noutput_items() to limit the size of the number of items possible for this block's work function. If is_set_max_notput_items() returns 'false', then the scheduler ignores the internal value and uses the value set globally in the top_block.

Use this value to clear the 'is_set' flag so the scheduler will ignore this. Use the set_max_noutput_items(m) call to both set a new value for max_noutput_items and to reenable its use in the scheduler.

void gr_block::unset_processor_affinity

(

)

Remove processor affinity to a specific core.

---

Member Data Documentation

gr_logger_ptr gr_block::d_debug_logger [protected]

gr_logger_ptr gr_block::d_logger [protected]

Used by blocks to access the logger system.

std::vector<long> gr_block::d_max_output_buffer [protected]

std::vector<long> gr_block::d_min_output_buffer [protected]

gruel::mutex gr_block::d_setlock [protected]

Used by block's setters and work functions to make setting/resetting of parameters thread-safe.

Used by calling gruel::scoped_lock l(d_setlock);

---

The documentation for this class was generated from the following file:

• gr_block.h