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/* -*- c++ -*- */
/*
* Copyright 2006 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 <gri_logger.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdexcept>
#include <boost/weak_ptr.hpp>
#include <string.h>
/*
* This class creates the thread that reads from the ringbuffer and
* and writes to the file. This is opaque to the user.
*/
class gri_log_poster : public omni_thread
{
FILE *d_fp;
gr_buffer_sptr d_writer;
gr_buffer_reader_sptr d_reader;
omni_semaphore d_ringbuffer_ready;
volatile bool d_time_to_die;
volatile bool d_writer_overrun;
virtual void* run_undetached(void * arg);
public:
gri_log_poster(const char *filename);
~gri_log_poster();
void kill() { d_time_to_die = true; post(); }
gr_buffer_sptr writer() const { return d_writer; }
void post() { d_ringbuffer_ready.post(); }
void note_writer_overrun() { d_writer_overrun = true; }
};
gri_log_poster::gri_log_poster(const char *filename)
: omni_thread(),
d_ringbuffer_ready(1, 1), // binary semaphore
d_time_to_die(false),
d_writer_overrun(false)
{
if ((d_fp = fopen(filename, "w")) == 0){
perror (filename);
throw std::runtime_error("can't open file");
}
// Create a 1MB buffer.
d_writer = gr_make_buffer(1 * 1024 * 1024, sizeof(unsigned char));
d_reader = gr_buffer_add_reader(d_writer, 0);
start_undetached(); // start the thread
}
gri_log_poster::~gri_log_poster()
{
if (d_fp != 0){
fclose(d_fp);
d_fp = 0;
}
}
/*
* This is the body of the logging thread.
*/
void *
gri_log_poster::run_undetached(void *arg)
{
int nbytes;
//fprintf(stderr, "Enter: run_undetached!\n");
while (!d_time_to_die){
while ((nbytes = d_reader->items_available()) > 0){
fwrite(d_reader->read_pointer(), 1, nbytes, d_fp);
d_reader->update_read_pointer(nbytes);
}
fflush(d_fp);
d_ringbuffer_ready.wait();
if (d_writer_overrun){
fputs(">>>>> gri_logger: writer overrun. Info lost <<<<<\n", d_fp);
d_writer_overrun = false;
}
}
// fprintf(stderr, "Exit: run_undetached!\n");
return 0;
}
// ------------------------------------------------------------------------
static boost::weak_ptr<gri_logger> s_singleton; // weak pointer IQ test ;-)
static omni_mutex s_singleton_mutex;
gri_logger_sptr
gri_logger::singleton()
{
omni_mutex_lock l(s_singleton_mutex);
gri_logger_sptr r;
if (r = s_singleton.lock())
return r;
r = gri_logger_sptr(new gri_logger("gri_logger.log"));
s_singleton = r;
return r;
}
gri_logger::gri_logger(const char *filename)
{
d_poster = new gri_log_poster(filename);
}
gri_logger::~gri_logger()
{
d_poster->kill();
d_poster->join(NULL);
}
void
gri_logger::write(const void *buf, size_t count)
{
omni_mutex_lock l(d_write_mutex);
gr_buffer_sptr writer = d_poster->writer();
// either write it all, or drop it on the ground
if (count <= (size_t) writer->space_available()){
memcpy(writer->write_pointer(), buf, count);
writer->update_write_pointer(count);
d_poster->post();
}
else {
d_poster->note_writer_overrun();
}
}
void
gri_logger::printf(const char *format, ...)
{
va_list ap;
char buf[4096];
int n;
va_start(ap, format);
n = vsnprintf(buf, sizeof(buf), format, ap);
va_end(ap);
if (n > -1 && n < (ssize_t) sizeof(buf))
write(buf, n);
}
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