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/* This file contains the flushpl method, which is a GNU extension to
libplot. It flushes (i.e. pushes onward) all plot commands sent to the
graphics device. */
/* This file also contains the internal _flush_plotter_outstreams() method,
which should be invoked by any Plotter that forks an auxiliary process.
(E.g., an XPlotter forks off an auxiliary process when closepl() is
invoked, to manage its `spun-off' window.) */
#include "sys-defines.h"
#include "extern.h"
#ifdef MSDOS
#include <unistd.h> /* for fsync() */
#endif
/* Mutex for locking _plotters[] and _plotters_len. Defined in
g_defplot.c. */
#ifdef PTHREAD_SUPPORT
#ifdef HAVE_PTHREAD_H
extern pthread_mutex_t _plotters_mutex;
#endif
#endif
int
#ifdef _HAVE_PROTOS
_API_flushpl (S___(Plotter *_plotter))
#else
_API_flushpl (S___(_plotter))
S___(Plotter *_plotter;)
#endif
{
int retval = 0;
if (!_plotter->data->open)
{
_plotter->error (R___(_plotter)
"flushpl: invalid operation");
return -1;
}
switch ((int)_plotter->data->output_model)
{
case (int)PL_OUTPUT_NONE:
/* Plotter doesn't do any output, so do nothing */
break;
case (int)PL_OUTPUT_ONE_PAGE:
case (int)PL_OUTPUT_ONE_PAGE_AT_A_TIME:
case (int)PL_OUTPUT_PAGES_ALL_AT_ONCE:
/* Plotter may have an output stream that can be flushed. Should
really distinguish here between Plotters that write graphics in
real time, and those that wait until the end of a page, or of all
pages, before writing graphics. */
if (_plotter->data->outfp)
{
if (fflush(_plotter->data->outfp) < 0
#ifdef MSDOS
/* data can be caught in DOS buffers, so do an fsync() too */
|| fsync (_plotter->data->outfp) < 0
#endif
)
retval = -1;
}
#ifdef LIBPLOTTER
if (_plotter->data->outstream)
{
_plotter->data->outstream->flush ();
if (!(*(_plotter->data->outstream)))
retval = -1;
}
#endif
break;
case (int)PL_OUTPUT_VIA_CUSTOM_ROUTINES:
case (int)PL_OUTPUT_VIA_CUSTOM_ROUTINES_IN_REAL_TIME:
case (int)PL_OUTPUT_VIA_CUSTOM_ROUTINES_TO_NON_STREAM:
/* Plotter does its own output, so invoke Plotter-specific flush
method */
if (_plotter->flush_output (S___(_plotter)) == false)
retval = -1;
break;
default: /* shouldn't happen */
break;
}
if (retval < 0)
_plotter->error (R___(_plotter)
"output stream jammed");
return retval;
}
/* An internal method that's called when any Plotter that does its own
output to a non-stream is flushed. Actually, this generic version does
nothing; it'll need to be overridden by any Plotter that wishes to make
use of this feature. Return value indicates success. */
bool
#ifdef _HAVE_PROTOS
_g_flush_output (S___(Plotter *_plotter))
#else
_g_flush_output (S___(_plotter))
S___(Plotter *_plotter;)
#endif
{
return true;
}
/* Flush output streams for all Plotters. Plotters that fork when the
closepl() operation is invoked should call this before forking.
This code is messy, because there are four cases to cover, and in the
final three, the global variables _plotters[] and _plotters_len need to
be locked and unlocked. */
void
#ifdef _HAVE_PROTOS
_flush_plotter_outstreams (S___(Plotter *_plotter))
#else
_flush_plotter_outstreams (S___(_plotter))
S___(Plotter *_plotter;)
#endif
{
#ifndef LIBPLOTTER
#ifdef HAVE_NULL_FLUSH
fflush ((FILE *)NULL);
#else /* not HAVE_NULL_FLUSH */
int i;
#ifdef PTHREAD_SUPPORT
#ifdef HAVE_PTHREAD_H
pthread_mutex_lock (&_plotters_mutex);
#endif
#endif
for (i = 0; i < _plotters_len; i++)
if (_plotters[i])
{
if (_plotters[i]->data->outfp)
fflush (_plotters[i]->data->outfp);
if (_plotters[i]->data->errfp)
fflush (_plotters[i]->data->errfp);
}
#ifdef PTHREAD_SUPPORT
#ifdef HAVE_PTHREAD_H
pthread_mutex_unlock (&_plotters_mutex);
#endif
#endif
#endif /* not HAVE_NULL_FLUSH */
#else /* LIBPLOTTER */
int i;
#ifdef PTHREAD_SUPPORT
#ifdef HAVE_PTHREAD_H
pthread_mutex_lock (&_plotters_mutex);
#endif
#endif
#ifdef HAVE_NULL_FLUSH
fflush ((FILE *)NULL);
for (i = 0; i < _plotters_len; i++)
if (_plotters[i])
{
if (_plotters[i]->data->outstream)
_plotters[i]->data->outstream->flush ();
if (_plotters[i]->data->errstream)
_plotters[i]->data->errstream->flush ();
}
#else /* not HAVE_NULL_FLUSH */
for (i = 0; i < _plotters_len; i++)
if (_plotters[i])
{
if (_plotters[i]->data->outfp)
fflush (_plotters[i]->data->outfp);
if (_plotters[i]->data->errfp)
fflush (_plotters[i]->data->errfp);
if (_plotters[i]->data->outstream)
_plotters[i]->data->outstream->flush ();
if (_plotters[i]->data->errstream)
_plotters[i]->data->errstream->flush ();
}
#endif /* not HAVE_NULL_FLUSH */
#ifdef PTHREAD_SUPPORT
#ifdef HAVE_PTHREAD_H
pthread_mutex_unlock (&_plotters_mutex);
#endif
#endif
#endif /* LIBPLOTTER */
}
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