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block高级功能
/* -*- c++ -*- */
/*
* Copyright 2004,2007,2009,2010,2013 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_GR_RUNTIME_BLOCK_H
#define INCLUDED_GR_RUNTIME_BLOCK_H
#include <gnuradio/api.h>
#include <gnuradio/basic_block.h>
#include <gnuradio/tags.h>
#include <gnuradio/logger.h>
namespace gr {
/*!
* \brief The abstract base class for all 'terminal' processing blocks.
* \ingroup base_blk
*
* 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.
*/
class GR_RUNTIME_API block : public basic_block
{
public:
//! Magic return values from general_work
enum {
WORK_CALLED_PRODUCE = -2,
WORK_DONE = -1
};
enum tag_propagation_policy_t {
TPP_DONT = 0,
TPP_ALL_TO_ALL = 1,
TPP_ONE_TO_ONE = 2
};
virtual ~block();
/*!
* 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.
*/
unsigned history() const;
void set_history(unsigned history);
/*!
* 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.
*
* \param which The buffer on which to set the delay.
* \param delay The sample delay of the data stream.
*/
void declare_sample_delay(int which, unsigned delay);
/*!
* Convenience wrapper to gr::block::declare_delay(int which, unsigned delay)
* to set all ports to the same delay.
*/
void declare_sample_delay(unsigned delay);
/*!
* 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.
*
* \param which Which port from which to get the sample delay.
*/
unsigned sample_delay(int which) const;
/*!
* \brief 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.
*/
bool fixed_rate() const { return d_fixed_rate; }
// ----------------------------------------------------------------
// override these to define your behavior
// ----------------------------------------------------------------
/*!
* \brief Estimate input requirements given output request
*
* \param noutput_items number of output items to produce
* \param ninput_items_required number of input items required on each input stream
*
* Given a request to product \p 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.
*/
virtual void forecast(int noutput_items,
gr_vector_int &ninput_items_required);
/*!
* \brief compute output items from input items
*
* \param noutput_items number of output items to write on each output stream
* \param ninput_items number of input items available on each input stream
* \param input_items vector of pointers to the input items, one entry per input stream
* \param 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.
*/
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);
/*!
* \brief 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.
*/
virtual bool start();
/*!
* \brief Called to disable drivers, etc for i/o devices.
*/
virtual bool stop();
// ----------------------------------------------------------------
/*!
* \brief 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 \param multiple The default value of
* output multiple is 1.
*/
void set_output_multiple(int multiple);
int output_multiple() const { return d_output_multiple; }
bool output_multiple_set() const { return d_output_multiple_set; }
/*!
* \brief 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 \param 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 set_alignment(int multiple);
int alignment() const { return d_output_multiple; }
void set_unaligned(int na);
int unaligned() const { return d_unaligned; }
void set_is_unaligned(bool u);
bool is_unaligned() const { return d_is_unaligned; }
/*!
* \brief Tell the scheduler \p how_many_items of input stream \p
* which_input were consumed.
* This function should be called at the end of work() or general_work(), after all processing is finished.
*/
void consume(int which_input, int how_many_items);
/*!
* \brief Tell the scheduler \p how_many_items were consumed on
* each input stream.
*/
void consume_each(int how_many_items);
/*!
* \brief Tell the scheduler \p how_many_items were produced on
* output stream \p which_output.
*
* If the block's general_work method calls produce, \p
* general_work must return WORK_CALLED_PRODUCE.
*/
void produce(int which_output, int how_many_items);
/*!
* \brief 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
*/
void set_relative_rate(double relative_rate);
/*!
* \brief return the approximate output rate / input rate
*/
double relative_rate() const { return d_relative_rate; }
/*
* The following two methods provide special case info to the
* scheduler in the event that a block has a fixed input to output
* ratio. sync_block, sync_decimator and
* sync_interpolator override these. If you're fixed rate,
* subclass one of those.
*/
/*!
* \brief 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_ninput_to_noutput(int ninput);
/*!
* \brief 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.
*/
virtual int fixed_rate_noutput_to_ninput(int noutput);
/*!
* \brief Return the number of items read on input stream which_input
*/
uint64_t nitems_read(unsigned int which_input);
/*!
* \brief Return the number of items written on output stream which_output
*/
uint64_t nitems_written(unsigned int which_output);
/*!
* \brief Asks for the policy used by the scheduler to moved tags downstream.
*/
tag_propagation_policy_t tag_propagation_policy();
/*!
* \brief Set the policy by the scheduler to determine how tags are moved downstream.
*/
void set_tag_propagation_policy(tag_propagation_policy_t p);
/*!
* \brief 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.
*/
int min_noutput_items() const { return d_min_noutput_items; }
/*!
* \brief Set the minimum number of output items this block can
* produce during a call to work.
*
* \param m the minimum noutput_items this block can produce.
*/
void set_min_noutput_items(int m) { d_min_noutput_items = m; }
/*!
* \brief Return the maximum number of output items this block will
* handle during a call to work.
*/
int max_noutput_items();
/*!
* \brief Set the maximum number of output items this block will
* handle during a call to work.
*
* \param m the maximum noutput_items this block will handle.
*/
void set_max_noutput_items(int m);
/*!
* \brief 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 unset_max_noutput_items();
/*!
* \brief 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 is_set_max_noutput_items();
/*
* Used to expand the vectors that hold the min/max buffer sizes.
*
* Specifically, when -1 is used, the vectors are just initialized
* with 1 value; this is used by the flat_flowgraph to expand when
* required to add a new value for new ports on these blocks.
*/
void expand_minmax_buffer(int port);
/*!
* \brief Returns max buffer size on output port \p i.
*/
long max_output_buffer(size_t i);
/*!
* \brief Request limit on max buffer size on all output ports.
*
* \details
* This is an advanced feature. Calling this can affect some
* fundamental assumptions about the system behavior and
* performance.
*
* The actual buffer size is determined by a number of other
* factors from the block and system. This function only provides
* a requested maximum. The buffers will always be a multiple of
* the system page size, which may be larger than the value asked
* for here.
*
* \param max_output_buffer the requested maximum output size in items.
*/
void set_max_output_buffer(long max_output_buffer);
/*!
* \brief Request limit on max buffer size on output port \p port.
*
* \details
* This is an advanced feature. Calling this can affect some
* fundamental assumptions about the system behavior and
* performance.
*
* The actual buffer size is determined by a number of other
* factors from the block and system. This function only provides
* a requested maximum. The buffers will always be a multiple of
* the system page size, which may be larger than the value asked
* for here.
*
* \param port the output port the request applies to.
* \param max_output_buffer the requested maximum output size in items.
*/
void set_max_output_buffer(int port, long max_output_buffer);
/*!
* \brief Returns min buffer size on output port \p i.
*/
long min_output_buffer(size_t i);
/*!
* \brief Request limit on the mininum buffer size on all output
* ports.
*
* \details
* This is an advanced feature. Calling this can affect some
* fundamental assumptions about the system behavior and
* performance.
*
* The actual buffer size is determined by a number of other
* factors from the block and system. This function only provides
* a requested minimum. The buffers will always be a multiple of
* the system page size, which may be larger than the value asked
* for here.
*
* \param min_output_buffer the requested minimum output size in items.
*/
void set_min_output_buffer(long min_output_buffer);
/*!
* \brief Request limit on min buffer size on output port \p port.
*
* \details
* This is an advanced feature. Calling this can affect some
* fundamental assumptions about the system behavior and
* performance.
*
* The actual buffer size is determined by a number of other
* factors from the block and system. This function only provides
* a requested minimum. The buffers will always be a multiple of
* the system page size, which may be larger than the value asked
* for here.
*
* \param port the output port the request applies to.
* \param min_output_buffer the requested minimum output size in items.
*/
void set_min_output_buffer(int port, long min_output_buffer);
// --------------- Performance counter functions -------------
/*!
* \brief Gets instantaneous noutput_items performance counter.
*/
float pc_noutput_items();
/*!
* \brief Gets average noutput_items performance counter.
*/
float pc_noutput_items_avg();
/*!
* \brief Gets variance of noutput_items performance counter.
*/
float pc_noutput_items_var();
/*!
* \brief Gets instantaneous num items produced performance counter.
*/
float pc_nproduced();
/*!
* \brief Gets average num items produced performance counter.
*/
float pc_nproduced_avg();
/*!
* \brief Gets variance of num items produced performance counter.
*/
float pc_nproduced_var();
/*!
* \brief Gets instantaneous fullness of \p which input buffer.
*/
float pc_input_buffers_full(int which);
/*!
* \brief Gets average fullness of \p which input buffer.
*/
float pc_input_buffers_full_avg(int which);
/*!
* \brief Gets variance of fullness of \p which input buffer.
*/
float pc_input_buffers_full_var(int which);
/*!
* \brief Gets instantaneous fullness of all input buffers.
*/
std::vector<float> pc_input_buffers_full();
/*!
* \brief Gets average fullness of all input buffers.
*/
std::vector<float> pc_input_buffers_full_avg();
/*!
* \brief Gets variance of fullness of all input buffers.
*/
std::vector<float> pc_input_buffers_full_var();
/*!
* \brief Gets instantaneous fullness of \p which input buffer.
*/
float pc_output_buffers_full(int which);
/*!
* \brief Gets average fullness of \p which input buffer.
*/
float pc_output_buffers_full_avg(int which);
/*!
* \brief Gets variance of fullness of \p which input buffer.
*/
float pc_output_buffers_full_var(int which);
/*!
* \brief Gets instantaneous fullness of all output buffers.
*/
std::vector<float> pc_output_buffers_full();
/*!
* \brief Gets average fullness of all output buffers.
*/
std::vector<float> pc_output_buffers_full_avg();
/*!
* \brief Gets variance of fullness of all output buffers.
*/
std::vector<float> pc_output_buffers_full_var();
/*!
* \brief Gets instantaneous clock cycles spent in work.
*/
float pc_work_time();
/*!
* \brief Gets average clock cycles spent in work.
*/
float pc_work_time_avg();
/*!
* \brief Gets average clock cycles spent in work.
*/
float pc_work_time_var();
/*!
* \brief Gets total clock cycles spent in work.
*/
float pc_work_time_total();
/*!
* \brief Gets average throughput.
*/
float pc_throughput_avg();
/*!
* \brief Resets the performance counters
*/
void reset_perf_counters();
/*!
* \brief Sets up export of perf. counters to ControlPort. Only
* called by the scheduler.
*/
void setup_pc_rpc();
/*!
* \brief Checks if this block is already exporting perf. counters
* to ControlPort.
*/
bool is_pc_rpc_set() { return d_pc_rpc_set; }
/*!
* \brief If the block calls this in its constructor, it's
* perf. counters will not be exported.
*/
void no_pc_rpc() { d_pc_rpc_set = true; }
// ----------------------------------------------------------------------------
// Functions to handle thread affinity
/*!
* \brief Set the thread's affinity to processor core \p n.
*
* \param mask a vector of ints of the core numbers available to this block.
*/
void set_processor_affinity(const std::vector<int> &mask);
/*!
* \brief Remove processor affinity to a specific core.
*/
void unset_processor_affinity();
/*!
* \brief Get the current processor affinity.
*/
std::vector<int> processor_affinity() { return d_affinity; }
/*!
* \brief Get the current thread priority in use
*/
int active_thread_priority();
/*!
* \brief Get the current thread priority stored
*/
int thread_priority();
/*!
* \brief Set the current thread priority
*/
int set_thread_priority(int priority);
bool update_rate() const;
// ----------------------------------------------------------------------------
/*!
* \brief the system message handler
*/
void system_handler(pmt::pmt_t msg);
/*!
* \brief returns true when execution has completed due to a message connection
*/
bool finished();
private:
int d_output_multiple;
bool d_output_multiple_set;
int d_unaligned;
bool d_is_unaligned;
double d_relative_rate; // approx output_rate / input_rate
block_detail_sptr d_detail; // implementation details
unsigned d_history;
unsigned d_attr_delay; // the block's sample delay
bool d_fixed_rate;
bool d_max_noutput_items_set; // if d_max_noutput_items is valid
int d_max_noutput_items; // value of max_noutput_items for this block
int d_min_noutput_items;
tag_propagation_policy_t d_tag_propagation_policy; // policy for moving tags downstream
std::vector<int> d_affinity; // thread affinity proc. mask
int d_priority; // thread priority level
bool d_pc_rpc_set;
bool d_update_rate; // should sched update rel rate?
bool d_finished; // true if msg ports think we are finished
protected:
block(void) {} // allows pure virtual interface sub-classes
block(const std::string &name,
gr::io_signature::sptr input_signature,
gr::io_signature::sptr output_signature);
void set_fixed_rate(bool fixed_rate) { d_fixed_rate = fixed_rate; }
/*!
* \brief Adds a new tag onto the given output buffer.
*
* \param which_output an integer of which output stream to attach the tag
* \param abs_offset a uint64 number of the absolute item number
* assicated with the tag. Can get from nitems_written.
* \param key the tag key as a PMT symbol
* \param value any PMT holding any value for the given key
* \param srcid optional source ID specifier; defaults to PMT_F
*/
inline 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)
{
tag_t tag;
tag.offset = abs_offset;
tag.key = key;
tag.value = http://www.mamicode.com/value;>
使用gr_modtool生成的模块模板中，仅仅给出了几个能够重写的函数。实际上全部的模块都是继承自block基类，在block基类中包括非常多的函数，通过在模块中重写这些函数能够实现非常多高级功能。 block高级功能
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