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 <gnuradio/block.h>

Inherits gr::basic_block.

Inherited by atsc_bit_timing_loop, atsc_field_sync_demux, atsc_field_sync_mux, gr::analog::ctcss_squelch_ff [virtual], gr::analog::pwr_squelch_cc [virtual], gr::analog::pwr_squelch_ff [virtual], gr::analog::squelch_base_cc [virtual], gr::analog::squelch_base_ff [virtual], gr::block_gateway [virtual], gr::blocks::copy [virtual], gr::blocks::delay [virtual], gr::blocks::keep_m_in_n [virtual], gr::blocks::keep_one_in_n [virtual], gr::blocks::message_debug [virtual], gr::blocks::message_strobe [virtual], gr::blocks::nop [virtual], gr::blocks::packed_to_unpacked_bb [virtual], gr::blocks::packed_to_unpacked_ii [virtual], gr::blocks::packed_to_unpacked_ss [virtual], gr::blocks::patterned_interleaver [virtual], gr::blocks::plateau_detector_fb [virtual], gr::blocks::random_pdu [virtual], gr::blocks::skiphead [virtual], gr::blocks::socket_pdu [virtual], gr::blocks::stream_mux [virtual], gr::blocks::tuntap_pdu [virtual], gr::blocks::unpacked_to_packed_bb [virtual], gr::blocks::unpacked_to_packed_ii [virtual], gr::blocks::unpacked_to_packed_ss [virtual], gr::blocks::vector_insert_b [virtual], gr::blocks::vector_insert_c [virtual], gr::blocks::vector_insert_f [virtual], gr::blocks::vector_insert_i [virtual], gr::blocks::vector_insert_s [virtual], gr::channels::sro_model [virtual], gr::digital::clock_recovery_mm_cc [virtual], gr::digital::clock_recovery_mm_ff [virtual], gr::digital::constellation_decoder_cb [virtual], gr::digital::constellation_receiver_cb [virtual], gr::digital::header_payload_demux [virtual], gr::digital::mpsk_receiver_cc [virtual], gr::digital::ofdm_chanest_vcvc [virtual], gr::digital::ofdm_frame_acquisition [virtual], gr::digital::ofdm_insert_preamble [virtual], gr::digital::ofdm_sampler [virtual], gr::digital::pfb_clock_sync_ccf [virtual], gr::digital::pfb_clock_sync_fff [virtual], gr::digital::simple_correlator [virtual], gr::digital::simple_framer [virtual], gr::filter::fractional_interpolator_cc [virtual], gr::filter::fractional_interpolator_ff [virtual], gr::filter::fractional_resampler_cc [virtual], gr::filter::fractional_resampler_ff [virtual], gr::filter::pfb_arb_resampler_ccf [virtual], gr::filter::pfb_arb_resampler_fff [virtual], gr::filter::pfb_channelizer_ccf [virtual], gr::filter::rational_resampler_base_ccc [virtual], gr::filter::rational_resampler_base_ccf [virtual], gr::filter::rational_resampler_base_fcc [virtual], gr::filter::rational_resampler_base_fff [virtual], gr::filter::rational_resampler_base_fsf [virtual], gr::filter::rational_resampler_base_scc [virtual], gr::noaa::hrpt_deframer [virtual], gr::pager::flex_sync [virtual], gr::qtgui::sink_c [virtual], gr::qtgui::sink_f [virtual], gr::sync_block, gr::tagged_stream_block, gr::trellis::constellation_metrics_cf [virtual], gr::trellis::metrics_c [virtual], gr::trellis::metrics_f [virtual], gr::trellis::metrics_i [virtual], gr::trellis::metrics_s [virtual], gr::trellis::pccc_decoder_b [virtual], gr::trellis::pccc_decoder_combined_cb [virtual], gr::trellis::pccc_decoder_combined_ci [virtual], gr::trellis::pccc_decoder_combined_cs [virtual], gr::trellis::pccc_decoder_combined_fb [virtual], gr::trellis::pccc_decoder_combined_fi [virtual], gr::trellis::pccc_decoder_combined_fs [virtual], gr::trellis::pccc_decoder_i [virtual], gr::trellis::pccc_decoder_s [virtual], gr::trellis::sccc_decoder_b [virtual], gr::trellis::sccc_decoder_combined_cb [virtual], gr::trellis::sccc_decoder_combined_ci [virtual], gr::trellis::sccc_decoder_combined_cs [virtual], gr::trellis::sccc_decoder_combined_fb [virtual], gr::trellis::sccc_decoder_combined_fi [virtual], gr::trellis::sccc_decoder_combined_fs [virtual], gr::trellis::sccc_decoder_i [virtual], gr::trellis::sccc_decoder_s [virtual], gr::trellis::siso_combined_f [virtual], gr::trellis::siso_f [virtual], gr::trellis::viterbi_b [virtual], gr::trellis::viterbi_combined_cb [virtual], gr::trellis::viterbi_combined_ci [virtual], gr::trellis::viterbi_combined_cs [virtual], gr::trellis::viterbi_combined_fb [virtual], gr::trellis::viterbi_combined_fi [virtual], gr::trellis::viterbi_combined_fs [virtual], gr::trellis::viterbi_combined_ib [virtual], gr::trellis::viterbi_combined_ii [virtual], gr::trellis::viterbi_combined_is [virtual], gr::trellis::viterbi_combined_sb [virtual], gr::trellis::viterbi_combined_si [virtual], gr::trellis::viterbi_combined_ss [virtual], gr::trellis::viterbi_i [virtual], and gr::trellis::viterbi_s [virtual].

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	~block ()
unsigned	history () const
void	set_history (unsigned history)
void	declare_sample_delay (int which, unsigned delay)
void	declare_sample_delay (unsigned delay)
unsigned	sample_delay (int which) const
bool	fixed_rate () const
	Return true if this block has a fixed input to output rate. More...
virtual void	forecast (int noutput_items, gr_vector_int &ninput_items_required)
	Estimate input requirements given output request. More...
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 More...
virtual bool	start ()
	Called to enable drivers, etc for i/o devices. More...
virtual bool	stop ()
	Called to disable drivers, etc for i/o devices. More...
void	set_output_multiple (int multiple)
	Constrain the noutput_items argument passed to forecast and general_work. More...
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) More...
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. More...
void	consume_each (int how_many_items)
	Tell the scheduler how_many_items were consumed on each input stream. More...
void	produce (int which_output, int how_many_items)
	Tell the scheduler how_many_items were produced on output stream which_output. More...
void	set_relative_rate (double relative_rate)
	Set the approximate output rate / input rate. More...
double	relative_rate () const
	return the approximate output rate / input rate More...
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. More...
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. More...
uint64_t	nitems_read (unsigned int which_input)
	Return the number of items read on input stream which_input. More...
uint64_t	nitems_written (unsigned int which_output)
	Return the number of items written on output stream which_output. More...
tag_propagation_policy_t	tag_propagation_policy ()
	Asks for the policy used by the scheduler to moved tags downstream. More...
void	set_tag_propagation_policy (tag_propagation_policy_t p)
	Set the policy by the scheduler to determine how tags are moved downstream. More...
int	min_noutput_items () const
	Return the minimum number of output items this block can produce during a call to work. More...
void	set_min_noutput_items (int m)
	Set the minimum number of output items this block can produce during a call to work. More...
int	max_noutput_items ()
	Return the maximum number of output items this block will handle during a call to work. More...
void	set_max_noutput_items (int m)
	Set the maximum number of output items this block will handle during a call to work. More...
void	unset_max_noutput_items ()
	Clear the switch for using the max_noutput_items value of this block. More...
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. More...
void	expand_minmax_buffer (int port)
long	max_output_buffer (size_t i)
	Returns max buffer size on output port i. More...
void	set_max_output_buffer (long max_output_buffer)
	Sets max buffer size on all output ports. More...
void	set_max_output_buffer (int port, long max_output_buffer)
	Sets max buffer size on output port port. More...
long	min_output_buffer (size_t i)
	Returns min buffer size on output port i. More...
void	set_min_output_buffer (long min_output_buffer)
	Sets min buffer size on all output ports. More...
void	set_min_output_buffer (int port, long min_output_buffer)
	Sets min buffer size on output port port. More...
float	pc_noutput_items ()
	Gets instantaneous noutput_items performance counter. More...
float	pc_noutput_items_avg ()
	Gets average noutput_items performance counter. More...
float	pc_noutput_items_var ()
	Gets variance of noutput_items performance counter. More...
float	pc_nproduced ()
	Gets instantaneous num items produced performance counter. More...
float	pc_nproduced_avg ()
	Gets average num items produced performance counter. More...
float	pc_nproduced_var ()
	Gets variance of num items produced performance counter. More...
float	pc_input_buffers_full (int which)
	Gets instantaneous fullness of which input buffer. More...
float	pc_input_buffers_full_avg (int which)
	Gets average fullness of which input buffer. More...
float	pc_input_buffers_full_var (int which)
	Gets variance of fullness of which input buffer. More...
std::vector< float >	pc_input_buffers_full ()
	Gets instantaneous fullness of all input buffers. More...
std::vector< float >	pc_input_buffers_full_avg ()
	Gets average fullness of all input buffers. More...
std::vector< float >	pc_input_buffers_full_var ()
	Gets variance of fullness of all input buffers. More...
float	pc_output_buffers_full (int which)
	Gets instantaneous fullness of which input buffer. More...
float	pc_output_buffers_full_avg (int which)
	Gets average fullness of which input buffer. More...
float	pc_output_buffers_full_var (int which)
	Gets variance of fullness of which input buffer. More...
std::vector< float >	pc_output_buffers_full ()
	Gets instantaneous fullness of all output buffers. More...
std::vector< float >	pc_output_buffers_full_avg ()
	Gets average fullness of all output buffers. More...
std::vector< float >	pc_output_buffers_full_var ()
	Gets variance of fullness of all output buffers. More...
float	pc_work_time ()
	Gets instantaneous clock cycles spent in work. More...
float	pc_work_time_avg ()
	Gets average clock cycles spent in work. More...
float	pc_work_time_var ()
	Gets average clock cycles spent in work. More...
float	pc_work_time_total ()
	Gets total clock cycles spent in work. More...
void	reset_perf_counters ()
	Resets the performance counters. More...
void	setup_pc_rpc ()
	Sets up export of perf. counters to ControlPort. Only called by the scheduler. More...
bool	is_pc_rpc_set ()
	Checks if this block is already exporting perf. counters to ControlPort. More...
void	no_pc_rpc ()
	If the block calls this in its constructor, it's perf. counters will not be exported. More...
void	set_processor_affinity (const std::vector< int > &mask)
	Set the thread's affinity to processor core n. More...
void	unset_processor_affinity ()
	Remove processor affinity to a specific core. More...
std::vector< int >	processor_affinity ()
	Get the current processor affinity. More...
int	active_thread_priority ()
	Get the current thread priority in use. More...
int	thread_priority ()
	Get the current thread priority stored. More...
int	set_thread_priority (int priority)
	Set the current thread priority. More...
bool	update_rate () const
block_detail_sptr	detail () const
void	set_detail (block_detail_sptr detail)
Public Member Functions inherited from gr::basic_block
pmt::pmt_t	message_subscribers (pmt::pmt_t port)
virtual	~basic_block ()
long	unique_id () const
long	symbolic_id () const
std::string	name () const
std::string	symbol_name () const
gr::io_signature::sptr	input_signature () const
gr::io_signature::sptr	output_signature () const
basic_block_sptr	to_basic_block ()
bool	alias_set ()
std::string	alias ()
pmt::pmt_t	alias_pmt ()
void	set_block_alias (std::string name)
void	message_port_register_in (pmt::pmt_t port_id)
void	message_port_register_out (pmt::pmt_t port_id)
void	message_port_pub (pmt::pmt_t port_id, pmt::pmt_t msg)
void	message_port_sub (pmt::pmt_t port_id, pmt::pmt_t target)
void	message_port_unsub (pmt::pmt_t port_id, pmt::pmt_t target)
virtual bool	message_port_is_hier (pmt::pmt_t port_id)
virtual bool	message_port_is_hier_in (pmt::pmt_t port_id)
virtual bool	message_port_is_hier_out (pmt::pmt_t port_id)
pmt::pmt_t	message_ports_in ()
	Get input message port names. More...
pmt::pmt_t	message_ports_out ()
	Get output message port names. More...
void	_post (pmt::pmt_t which_port, pmt::pmt_t msg)
bool	empty_p (pmt::pmt_t which_port)
	is the queue empty? More...
bool	empty_p ()
bool	empty_handled_p (pmt::pmt_t which_port)
	are all msg ports with handlers empty? More...
bool	empty_handled_p ()
size_t	nmsgs (pmt::pmt_t which_port)
	How many messages in the queue? More...
void	insert_tail (pmt::pmt_t which_port, pmt::pmt_t msg)
pmt::pmt_t	delete_head_nowait (pmt::pmt_t which_port)
pmt::pmt_t	delete_head_blocking (pmt::pmt_t which_port)
msg_queue_t::iterator	get_iterator (pmt::pmt_t which_port)
void	erase_msg (pmt::pmt_t which_port, msg_queue_t::iterator it)
virtual bool	has_msg_port (pmt::pmt_t which_port)
virtual void	setup_rpc ()
	Set up the RPC registered variables. More...
bool	is_rpc_set ()
	Ask if this block has been registered to the RPC. More...
void	rpc_set ()
	When the block is registered with the RPC, set this. More...
virtual bool	check_topology (int ninputs, int noutputs)
	Confirm that ninputs and noutputs is an acceptable combination. More...
template<typename T >
void	set_msg_handler (pmt::pmt_t which_port, T msg_handler)
	Set the callback that is fired when messages are available. More...
Public Member Functions inherited from gr::msg_accepter
	msg_accepter ()
	~msg_accepter ()
void	post (pmt::pmt_t which_port, pmt::pmt_t msg)
	send msg to msg_accepter on port which_port More...
Public Member Functions inherited from gr::messages::msg_accepter
	msg_accepter ()

Protected Member Functions
	block (void)
	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. More...
void	add_item_tag (unsigned int which_output, const tag_t &tag)
	Adds a new tag onto the given output buffer. More...
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. More...
void	remove_item_tag (unsigned int which_input, const tag_t &tag)
	Removes a tag from the given input buffer. More...
void	get_tags_in_range (std::vector< 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. More...
void	get_tags_in_range (std::vector< 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. More...
void	enable_update_rate (bool en)
Protected Member Functions inherited from gr::basic_block
	basic_block (void)
	basic_block (const std::string &name, gr::io_signature::sptr input_signature, gr::io_signature::sptr output_signature)
	Protected constructor prevents instantiation by non-derived classes. More...
void	set_input_signature (gr::io_signature::sptr iosig)
	may only be called during constructor More...
void	set_output_signature (gr::io_signature::sptr iosig)
	may only be called during constructor More...
void	set_color (vcolor color)
	Allow the flowgraph to set for sorting and partitioning. More...
vcolor	color () const
virtual bool	has_msg_handler (pmt::pmt_t which_port)
	Tests if there is a handler attached to port which_port. More...
virtual void	dispatch_msg (pmt::pmt_t which_port, pmt::pmt_t msg)

Protected Attributes
std::vector< long >	d_max_output_buffer
std::vector< long >	d_min_output_buffer
gr::thread::mutex	d_setlock
gr::logger_ptr	d_logger
gr::logger_ptr	d_debug_logger
Protected Attributes inherited from gr::basic_block
std::string	d_name
gr::io_signature::sptr	d_input_signature
gr::io_signature::sptr	d_output_signature
long	d_unique_id
long	d_symbolic_id
std::string	d_symbol_name
std::string	d_symbol_alias
vcolor	d_color
bool	d_rpc_set
msg_queue_map_t	msg_queue
std::vector< boost::any >	d_rpc_vars
pmt::pmt_t	d_message_subscribers

Additional Inherited Members
Protected Types inherited from gr::basic_block
enum	vcolor { WHITE, GREY, BLACK }

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::~block ( )

virtual

gr::block::block ( void  )

inlineprotected

gr::block::block ( const std::string &  name, gr::io_signature::sptr  input_signature, gr::io_signature::sptr  output_signature  )

protected

Member Function Documentation

int gr::block::active_thread_priority

(

)

Get the current thread priority in use.

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  )

inlineprotected

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::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 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::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::block__consume_each().

void gr::block::declare_sample_delay	(	int	which,
		unsigned	delay
	)

Declares the block's delay in samples. Since the delay of blocks like filters is derived from the taps and not the block itself, we cannot automatically calculate this value and so leave it as a user-defined property. It defaults to 0 is not set.

This does not actively set the delay; it just tells the scheduler what the delay is.

This delay is mostly used to adjust the placement of the tags and is not currently used for any signal processing. When a tag is passed through a block with internal delay, its location should be moved based on the delay of the block. This interface allows us to tell the scheduler this value.

Parameters

which	The buffer on which to set the delay.
delay	The sample delay of the data stream.

void gr::block::declare_sample_delay

(

unsigned

delay

)

Convenience wrapper to gr::block::declare_delay(int which, unsigned delay) to set all ports to the same delay.

block_detail_sptr gr::block::detail ( ) const

inline

void gr::block::enable_update_rate ( bool  en )

protected

void gr::block::expand_minmax_buffer

(

int

port

)

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::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::sync_interpolator, gr::sync_decimator, and gr::sync_block.

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::sync_interpolator, gr::sync_decimator, and gr::sync_block.

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::tagged_stream_block, atsc_bit_timing_loop, gr::sync_interpolator, gr::sync_decimator, gr::sync_block, gr::fft::ctrlport_probe_psd_impl, atsc_equalizer, atsc_field_sync_demux, atsc_field_sync_mux, and atsc_pad.

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::tagged_stream_block, atsc_bit_timing_loop, gr::sync_interpolator, gr::sync_decimator, gr::sync_block, atsc_field_sync_demux, and atsc_field_sync_mux.

void gr::block::get_tags_in_range ( std::vector< 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::block__get_tags_in_range(), and tag_sink_demo::work().

void gr::block::get_tags_in_range ( std::vector< 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

unsigned gr::block::history

(

)

const

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.

Referenced by gr::block_gateway::block__history().

bool gr::block::is_pc_rpc_set ( )

inline

Checks if this block is already exporting perf. counters to ControlPort.

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

)

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

)

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::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::block__nitems_written(), and tag_source_demo::work().

void gr::block::no_pc_rpc ( )

inline

If the block calls this in its constructor, it's perf. counters will not be exported.

int gr::block::output_multiple ( ) const

inline

Referenced by gr::block_gateway::block__output_multiple().

bool gr::block::output_multiple_set ( ) const

inline

float gr::block::pc_input_buffers_full

(

int

which

)

Gets instantaneous fullness of which input buffer.

std::vector<float> gr::block::pc_input_buffers_full

(

)

Gets instantaneous fullness of all input buffers.

float gr::block::pc_input_buffers_full_avg

(

int

which

)

Gets average fullness of which input buffer.

std::vector<float> gr::block::pc_input_buffers_full_avg

(

)

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 instantaneous noutput_items performance counter.

float gr::block::pc_noutput_items_avg

(

)

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 instantaneous num items produced performance counter.

float gr::block::pc_nproduced_avg

(

)

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 instantaneous fullness of which input buffer.

std::vector<float> gr::block::pc_output_buffers_full

(

)

Gets instantaneous fullness of all output buffers.

float gr::block::pc_output_buffers_full_avg

(

int

which

)

Gets average fullness of which input buffer.

std::vector<float> gr::block::pc_output_buffers_full_avg

(

)

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 instantaneous clock cycles spent in work.

float gr::block::pc_work_time_avg

(

)

Gets average clock cycles spent in work.

float gr::block::pc_work_time_total

(

)

Gets total 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 ( )

inlinevirtual

Get the current processor affinity.

Reimplemented from gr::basic_block.

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::block__produce().

double gr::block::relative_rate ( ) const

inline

return the approximate output rate / input rate

Referenced by gr::block_gateway::block__relative_rate().

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  )

inlineprotected

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::remove_item_tag ( unsigned int  which_input, const 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::reset_perf_counters

(

)

Resets the performance counters.

unsigned gr::block::sample_delay

(

int

which

)

const

Gets the delay of the block. Since the delay of blocks like filters is derived from the taps and not the block itself, we cannot automatically calculate this value and so leave it as a user-defined property. It defaults to 0 is not set.

Parameters

which

Which port from which to get the sample delay.

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 ( block_detail_sptr  detail )

inline

void gr::block::set_fixed_rate ( bool  fixed_rate )

inlineprotected

Referenced by gr::block_gateway::block__set_fixed_rate().

void gr::block::set_history

(

unsigned

history

)

Referenced by gr::block_gateway::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

)

Sets max buffer size on all output ports.

void gr::block::set_max_output_buffer	(	int	port,
		long	max_output_buffer
	)

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

)

Sets min buffer size on all output ports.

void gr::block::set_min_output_buffer	(	int	port,
		long	min_output_buffer
	)

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::block__set_output_multiple().

void gr::block::set_processor_affinity ( const std::vector< int > &  mask )

virtual

Set the thread's affinity to processor core n.

Parameters

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

Reimplemented from gr::basic_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::block__set_relative_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::block__set_tag_propagation_policy().

int gr::block::set_thread_priority

(

int

priority

)

Set the current thread priority.

void gr::block::set_unaligned

(

int

na

)

void gr::block::setup_pc_rpc

(

)

Sets up export of perf. counters to ControlPort. Only called by the scheduler.

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::blocks::probe_rate.

virtual bool gr::block::stop ( )

virtual

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

Reimplemented in gr::blocks::probe_rate.

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::block__tag_propagation_policy().

int gr::block::thread_priority

(

)

Get the current thread priority stored.

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 ( )

virtual

Remove processor affinity to a specific core.

Reimplemented from gr::basic_block.

bool gr::block::update_rate

(

)

const

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

gr::thread::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 gr::thread::scoped_lock l(d_setlock);

---

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

• block.h