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gr-osmosdr/lib/runtime/block_executor.cc

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/* -*- c++ -*- */
/*
* Copyright 2004,2008-2010,2013 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <block_executor.h>
#include <gnuradio/block.h>
#include <gnuradio/block_detail.h>
#include <gnuradio/buffer.h>
#include <gnuradio/prefs.h>
#include <boost/thread.hpp>
#include <boost/format.hpp>
#include <iostream>
#include <limits>
#include <assert.h>
#include <stdio.h>
namespace gr {
// must be defined to either 0 or 1
#define ENABLE_LOGGING 0
#if (ENABLE_LOGGING)
#define LOG(x) do { x; } while(0)
#else
#define LOG(x) do {;} while(0)
#endif
static int which_scheduler = 0;
inline static unsigned int
round_up(unsigned int n, unsigned int multiple)
{
return ((n + multiple - 1) / multiple) * multiple;
}
inline static unsigned int
round_down(unsigned int n, unsigned int multiple)
{
return (n / multiple) * multiple;
}
//
// Return minimum available write space in all our downstream
// buffers or -1 if we're output blocked and the output we're
// blocked on is done.
//
static int
min_available_space(block_detail *d, int output_multiple, int min_noutput_items)
{
int min_space = std::numeric_limits<int>::max();
if(min_noutput_items == 0)
min_noutput_items = 1;
for(int i = 0; i < d->noutputs (); i++) {
gr::thread::scoped_lock guard(*d->output(i)->mutex());
int avail_n = round_down(d->output(i)->space_available(), output_multiple);
int best_n = round_down(d->output(i)->bufsize()/2, output_multiple);
if(best_n < min_noutput_items)
throw std::runtime_error("Buffer too small for min_noutput_items");
int n = std::min(avail_n, best_n);
if(n < min_noutput_items){ // We're blocked on output.
if(d->output(i)->done()){ // Downstream is done, therefore we're done.
return -1;
}
return 0;
}
min_space = std::min(min_space, n);
}
return min_space;
}
block_executor::block_executor(block_sptr block, int max_noutput_items)
: d_block(block), d_log(0), d_max_noutput_items(max_noutput_items)
{
if(ENABLE_LOGGING) {
std::string name = str(boost::format("sst-%03d.log") % which_scheduler++);
d_log = new std::ofstream(name.c_str());
std::unitbuf(*d_log); // make it unbuffered...
*d_log << "block_executor: "
<< d_block << std::endl;
}
#ifdef GR_PERFORMANCE_COUNTERS
prefs *prefs = prefs::singleton();
d_use_pc = prefs->get_bool("PerfCounters", "on", false);
#endif /* GR_PERFORMANCE_COUNTERS */
d_block->start(); // enable any drivers, etc.
}
block_executor::~block_executor()
{
if(ENABLE_LOGGING)
delete d_log;
d_block->stop(); // stop any drivers, etc.
}
block_executor::state
block_executor::run_one_iteration()
{
int noutput_items;
int max_items_avail;
int max_noutput_items;
int new_alignment = 0;
int alignment_state = -1;
block *m = d_block.get();
block_detail *d = m->detail().get();
LOG(*d_log << std::endl << m);
max_noutput_items = round_down(d_max_noutput_items, m->output_multiple());
if(d->done()){
assert(0);
return DONE;
}
if(d->source_p ()) {
d_ninput_items_required.resize(0);
d_ninput_items.resize(0);
d_input_items.resize(0);
d_input_done.resize(0);
d_output_items.resize(d->noutputs());
d_start_nitems_read.resize(0);
// determine the minimum available output space
noutput_items = min_available_space(d, m->output_multiple (), m->min_noutput_items ());
noutput_items = std::min(noutput_items, max_noutput_items);
LOG(*d_log << " source\n noutput_items = " << noutput_items << std::endl);
if(noutput_items == -1) // we're done
goto were_done;
if(noutput_items == 0){ // we're output blocked
LOG(*d_log << " BLKD_OUT\n");
return BLKD_OUT;
}
goto setup_call_to_work; // jump to common code
}
else if(d->sink_p ()) {
d_ninput_items_required.resize(d->ninputs ());
d_ninput_items.resize(d->ninputs ());
d_input_items.resize(d->ninputs ());
d_input_done.resize(d->ninputs());
d_output_items.resize (0);
d_start_nitems_read.resize(d->ninputs());
LOG(*d_log << " sink\n");
max_items_avail = 0;
for(int i = 0; i < d->ninputs (); i++) {
{
/*
* Acquire the mutex and grab local copies of items_available and done.
*/
gr::thread::scoped_lock guard(*d->input(i)->mutex());
d_ninput_items[i] = d->input(i)->items_available();
d_input_done[i] = d->input(i)->done();
}
LOG(*d_log << " d_ninput_items[" << i << "] = " << d_ninput_items[i] << std::endl);
LOG(*d_log << " d_input_done[" << i << "] = " << d_input_done[i] << std::endl);
if (d_ninput_items[i] < m->output_multiple() && d_input_done[i])
goto were_done;
max_items_avail = std::max (max_items_avail, d_ninput_items[i]);
}
// take a swag at how much output we can sink
noutput_items = (int)(max_items_avail * m->relative_rate ());
noutput_items = round_down(noutput_items, m->output_multiple ());
noutput_items = std::min(noutput_items, max_noutput_items);
LOG(*d_log << " max_items_avail = " << max_items_avail << std::endl);
LOG(*d_log << " noutput_items = " << noutput_items << std::endl);
if(noutput_items == 0) { // we're blocked on input
LOG(*d_log << " BLKD_IN\n");
return BLKD_IN;
}
goto try_again; // Jump to code shared with regular case.
}
else {
// do the regular thing
d_ninput_items_required.resize (d->ninputs ());
d_ninput_items.resize (d->ninputs ());
d_input_items.resize (d->ninputs ());
d_input_done.resize(d->ninputs());
d_output_items.resize (d->noutputs ());
d_start_nitems_read.resize(d->ninputs());
max_items_avail = 0;
for(int i = 0; i < d->ninputs (); i++) {
{
/*
* Acquire the mutex and grab local copies of items_available and done.
*/
gr::thread::scoped_lock guard(*d->input(i)->mutex());
d_ninput_items[i] = d->input(i)->items_available ();
d_input_done[i] = d->input(i)->done();
}
max_items_avail = std::max(max_items_avail, d_ninput_items[i]);
}
// determine the minimum available output space
noutput_items = min_available_space(d, m->output_multiple(), m->min_noutput_items());
if(ENABLE_LOGGING) {
*d_log << " regular ";
if(m->relative_rate() >= 1.0)
*d_log << "1:" << m->relative_rate() << std::endl;
else
*d_log << 1.0/m->relative_rate() << ":1\n";
*d_log << " max_items_avail = " << max_items_avail << std::endl;
*d_log << " noutput_items = " << noutput_items << std::endl;
}
if(noutput_items == -1) // we're done
goto were_done;
if(noutput_items == 0) { // we're output blocked
LOG(*d_log << " BLKD_OUT\n");
return BLKD_OUT;
}
try_again:
if(m->fixed_rate()) {
// try to work it forward starting with max_items_avail.
// We want to try to consume all the input we've got.
int reqd_noutput_items = m->fixed_rate_ninput_to_noutput(max_items_avail);
// only test this if we specifically set the output_multiple
if(m->output_multiple_set())
reqd_noutput_items = round_down(reqd_noutput_items, m->output_multiple());
if(reqd_noutput_items > 0 && reqd_noutput_items <= noutput_items)
noutput_items = reqd_noutput_items;
// if we need this many outputs, overrule the max_noutput_items setting
max_noutput_items = std::max(m->output_multiple(), max_noutput_items);
}
noutput_items = std::min(noutput_items, max_noutput_items);
// Check if we're still unaligned; use up items until we're
// aligned again. Otherwise, make sure we set the alignment
// requirement.
if(!m->output_multiple_set()) {
if(m->is_unaligned()) {
// When unaligned, don't just set noutput_items to the remaining
// samples to meet alignment; this causes too much overhead in
// requiring a premature call back here. Set the maximum amount
// of samples to handle unalignment and get us back aligned.
if(noutput_items >= m->unaligned()) {
noutput_items = round_up(noutput_items, m->alignment()) \
- (m->alignment() - m->unaligned());
new_alignment = 0;
}
else {
new_alignment = m->unaligned() - noutput_items;
}
alignment_state = 0;
}
else if(noutput_items < m->alignment()) {
// if we don't have enough for an aligned call, keep track of
// misalignment, set unaligned flag, and proceed.
new_alignment = m->alignment() - noutput_items;
m->set_unaligned(new_alignment);
m->set_is_unaligned(true);
alignment_state = 1;
}
else {
// enough to round down to the nearest alignment and process.
noutput_items = round_down(noutput_items, m->alignment());
m->set_is_unaligned(false);
alignment_state = 2;
}
}
// ask the block how much input they need to produce noutput_items
m->forecast (noutput_items, d_ninput_items_required);
// See if we've got sufficient input available
int i;
for(i = 0; i < d->ninputs (); i++)
if(d_ninput_items_required[i] > d_ninput_items[i]) // not enough
break;
if(i < d->ninputs()) { // not enough input on input[i]
// if we can, try reducing the size of our output request
if(noutput_items > m->output_multiple()) {
noutput_items /= 2;
noutput_items = round_up(noutput_items, m->output_multiple());
goto try_again;
}
// We're blocked on input
LOG(*d_log << " BLKD_IN\n");
if(d_input_done[i]) // If the upstream block is done, we're done
goto were_done;
// Is it possible to ever fulfill this request?
if(d_ninput_items_required[i] > d->input(i)->max_possible_items_available()) {
// Nope, never going to happen...
std::cerr << "\nsched: <block " << m->name()
<< " (" << m->unique_id() << ")>"
<< " is requesting more input data\n"
<< " than we can provide.\n"
<< " ninput_items_required = "
<< d_ninput_items_required[i] << "\n"
<< " max_possible_items_available = "
<< d->input(i)->max_possible_items_available() << "\n"
<< " If this is a filter, consider reducing the number of taps.\n";
goto were_done;
}
// If we were made unaligned in this round but return here without
// processing; reset the unalignment claim before next entry.
if(alignment_state == 1) {
m->set_unaligned(0);
m->set_is_unaligned(false);
}
return BLKD_IN;
}
// We've got enough data on each input to produce noutput_items.
// Finish setting up the call to work.
for(int i = 0; i < d->ninputs (); i++)
d_input_items[i] = d->input(i)->read_pointer();
setup_call_to_work:
d->d_produce_or = 0;
for(int i = 0; i < d->noutputs (); i++)
d_output_items[i] = d->output(i)->write_pointer();
// determine where to start looking for new tags
for(int i = 0; i < d->ninputs(); i++)
d_start_nitems_read[i] = d->nitems_read(i);
#ifdef GR_PERFORMANCE_COUNTERS
if(d_use_pc)
d->start_perf_counters();
#endif /* GR_PERFORMANCE_COUNTERS */
// Do the actual work of the block
int n = m->general_work(noutput_items, d_ninput_items,
d_input_items, d_output_items);
#ifdef GR_PERFORMANCE_COUNTERS
if(d_use_pc)
d->stop_perf_counters(noutput_items, n);
#endif /* GR_PERFORMANCE_COUNTERS */
LOG(*d_log << " general_work: noutput_items = " << noutput_items
<< " result = " << n << std::endl);
// Adjust number of unaligned items left to process
if(m->is_unaligned()) {
m->set_unaligned(new_alignment);
m->set_is_unaligned(m->unaligned() != 0);
}
if(n == block::WORK_DONE)
goto were_done;
if(n != block::WORK_CALLED_PRODUCE)
d->produce_each (n); // advance write pointers
if(d->d_produce_or > 0) // block produced something
return READY;
// We didn't produce any output even though we called general_work.
// We have (most likely) consumed some input.
/*
// If this is a source, it's broken.
if(d->source_p()) {
std::cerr << "block_executor: source " << m
<< " produced no output. We're marking it DONE.\n";
// FIXME maybe we ought to raise an exception...
goto were_done;
}
*/
// Have the caller try again...
return READY_NO_OUTPUT;
}
assert(0);
were_done:
LOG(*d_log << " were_done\n");
d->set_done (true);
return DONE;
}
} /* namespace gr */
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