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Experiment about SG_FLAG_DIRECT_IO

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This commit is contained in:
Thomas Schmitt
2009-11-20 13:48:44 +00:00
parent c8e0472637
commit f39ff2c2f6
4 changed files with 38 additions and 2 deletions
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27
libburn/write.c
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@ -50,6 +50,12 @@
extern struct libdax_msgs *libdax_messenger;
/* ts A91120 : <<< experimental */
#ifdef Libburn_mmap_write_buffeR
#include <sys/mman.h>
#endif
/* The maximum output size to be used with CD media. This is also curbed
by BURN_OS_TRANSPORT_BUFFER_SIZE. The smaller number gets into effect.
*/
@ -2307,6 +2313,11 @@ void burn_disc_write_sync(struct burn_write_opts *o, struct burn_disc *disc)
off_t default_size;
char msg[80];
#ifdef Libburn_mmap_write_buffeR
size_t buffer_size;
#endif
/* ts A60924 : libburn/message.c gets obsoleted
burn_message_clear_queue();
*/
@ -2321,9 +2332,21 @@ void burn_disc_write_sync(struct burn_write_opts *o, struct burn_disc *disc)
else
d->stream_recording_start = 0;
#ifdef Libburn_mmap_write_buffeR
fprintf(stderr,
"libburn_EXPERIMENTAL: allocating write buffer via mmap()\n");
buffer_size = sizeof(struct buffer);
if (buffer_size % (64 * 1024))
buffer_size += 64 * 1024 - (buffer_size % (64 * 1024));
d->buffer = mmap(NULL, buffer_size, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, (off_t) 0);
if(d->buffer == MAP_FAILED)
goto fail_wo_sync;
#else
d->buffer = calloc(sizeof(struct buffer), 1);
if (d->buffer == NULL)
goto fail_wo_sync;
#endif /* ! Libburn_mmap_write_buffeR */
/* >>> ts A90321
@ -2546,7 +2569,11 @@ fail_wo_sync:;
ex:;
d->do_stream_recording = 0;
if (d->buffer != NULL)
#ifdef Libburn_mmap_write_buffeR
munmap(d->buffer, buffer_size);
#else
free((char *) d->buffer);
#endif
d->buffer = buffer_mem;
return;
}