summaryrefslogtreecommitdiffstats
path: root/src
diff options
context:
space:
mode:
authorRobb Matzke <matzke@llnl.gov>1997-10-15 18:13:53 (GMT)
committerRobb Matzke <matzke@llnl.gov>1997-10-15 18:13:53 (GMT)
commit20554bcc96cdcb7100ec435ef33116fb1e3f642e (patch)
tree986baa0d0f2868e92c4812fd52933792477e092c /src
parentf2257d5c815c3feee98d06136d191f0de8932da1 (diff)
downloadhdf5-20554bcc96cdcb7100ec435ef33116fb1e3f642e.zip
hdf5-20554bcc96cdcb7100ec435ef33116fb1e3f642e.tar.gz
hdf5-20554bcc96cdcb7100ec435ef33116fb1e3f642e.tar.bz2
[svn-r119] Fixed seek optimization problems.
Diffstat (limited to 'src')
-rw-r--r--src/H5F.c39
1 files changed, 33 insertions, 6 deletions
diff --git a/src/H5F.c b/src/H5F.c
index 25cb336..eccb1ef 100644
--- a/src/H5F.c
+++ b/src/H5F.c
@@ -49,6 +49,13 @@ static char RcsId[] = "@(#)$Revision$";
#include <sys/types.h>
#include <sys/stat.h>
+/*
+ * Define the following if you want H5F_block_read() and H5F_block_write() to
+ * keep track of the file position and attempt to minimize calls to the file
+ * seek method.
+ */
+#define H5F_OPT_SEEK
+
#define PABLO_MASK H5F_mask
@@ -807,12 +814,24 @@ H5F_open (const char *name, uintn flags,
}
/* What is the current size of the file? */
- if (H5F_SEEKEND (f->shared->file_handle)<0) {
- /* Cannot determine file size */
- HGOTO_ERROR (H5E_FILE, H5E_CANTINIT, NULL);
+#ifndef LATER
+ /*
+ * Remember the current position so we can reset it. If not, the seek()
+ * optimization stuff gets confused. Eventually we should have a
+ * get_filesize() method for the various file types we'll have.
+ */
+ {
+ size_t curpos = H5F_TELL (f->shared->file_handle);
+#endif
+ if (H5F_SEEKEND (f->shared->file_handle)<0) {
+ /* Cannot determine file size */
+ HGOTO_ERROR (H5E_FILE, H5E_CANTINIT, NULL);
+ }
+ f->shared->logical_len = H5F_TELL (f->shared->file_handle);
+#ifndef LATER
+ H5F_SEEK (f->shared->file_handle, curpos);
}
- f->shared->logical_len = H5F_TELL (f->shared->file_handle);
-
+#endif
/* Success! */
@@ -1041,7 +1060,7 @@ hid_t H5Fopen(const char *filename, uintn flags, hid_t access_temp)
* INVALIDATE was non-zero.
*
* Programmer: Robb Matzke
- * robb@maya.nuance.com
+ * matzke@llnl.gov
* Aug 29 1997
*
* Modifications:
@@ -1296,14 +1315,18 @@ H5F_block_read (H5F_t *f, haddr_t addr, size_t size, void *buf)
addr += f->shared->file_create_parms.userblock_size;
/* Check for switching file access operations or mis-placed seek offset */
+#ifdef H5F_OPT_SEEK
if(f->shared->last_op!=OP_READ || f->shared->f_cur_off!=addr)
{
+#endif
f->shared->last_op=OP_READ;
if (H5F_SEEK (f->shared->file_handle, addr)<0) {
/* low-level seek failure */
HRETURN_ERROR (H5E_IO, H5E_SEEKERROR, FAIL);
} /* end if */
+#ifdef H5F_OPT_SEEK
} /* end if */
+#endif
if (H5F_READ (f->shared->file_handle, buf, size)<0) {
/* low-level read failure */
HRETURN_ERROR (H5E_IO, H5E_READERROR, FAIL);
@@ -1351,14 +1374,18 @@ H5F_block_write (H5F_t *f, haddr_t addr, size_t size, void *buf)
}
/* Check for switching file access operations or mis-placed seek offset */
+#ifdef H5F_OPT_SEEK
if(f->shared->last_op!=OP_WRITE || f->shared->f_cur_off!=addr)
{
+#endif
f->shared->last_op=OP_WRITE;
if (H5F_SEEK (f->shared->file_handle, addr)<0) {
/* low-level seek failure */
HRETURN_ERROR (H5E_IO, H5E_SEEKERROR, FAIL);
}
+#ifdef H5F_OPT_SEEK
} /* end if */
+#endif
if (H5F_WRITE (f->shared->file_handle, buf, size)<0) {
/* low-level write failure */