obitools/obitools3
2
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases 66 Wiki Activity

When enlarging a column, the function doesn't try anymore to keep the

Browse Source 
mapped region at the same pointer (never works), and unmap/remap
instead.
This commit is contained in:
Celine Mercier
2015-11-10 13:18:36 +01:00
parent d885eb48ff
commit 8ce4f264aa
1 changed files with 17 additions and 41 deletions
Download Patch File Download Diff File Expand all files Collapse all files

58
src/obidmscolumn.c
View File

@ -962,7 +962,7 @@ int obi_truncate_column_to_lines_used(OBIDMS_column_p column) // TODO is it nece
// Compute the new line count = the number of lines used rounded to the nearest greater multiple of page size greater than 0
multiple = ceil((double) (ONE_IF_ZERO((column->header)->lines_used) * (column->header)->nb_elements_per_line * obi_sizeof((column->header)->data_type)) / (double) getpagesize());
new_line_count = floor((((int) multiple) * getpagesize()) / ((column->header)->nb_elements_per_line * obi_sizeof((column->header)->data_type))); // TODO is it safe to cast like this?
new_line_count = floor((((int) multiple) * getpagesize()) / ((column->header)->nb_elements_per_line * obi_sizeof((column->header)->data_type)));
// Check that it is actually greater than the current number of lines allocated in the file, otherwise no need to truncate
if ((column->header)->line_count == new_line_count)
@ -1090,18 +1090,23 @@ int obi_enlarge_column(OBIDMS_column_p column)
return -1;
}
// Remap the data: try enlarging mapped region (TODO this actually never works on my mac without the MAP_FIXED flag which overwrites everything)
// TODO : makes separate function even if it's only used here?
//obidebug(2, "\ntry enlarging mapped region: old size = %ld, new size = %ld, size = %ld", old_data_size, new_data_size, new_data_size - old_data_size);
new_data = mmap(column->data,
new_data_size - old_data_size,
PROT_READ | PROT_WRITE,
MAP_SHARED,
column_file_descriptor,
old_data_size
);
// Unmap and remap the data
if (munmap(column->data, old_data_size) < 0)
{
obi_set_errno(OBICOL_UNKNOWN_ERROR);
obidebug(1, "\nError munmapping the data of a column before enlarging");
close(column_file_descriptor);
return -1;
}
if (new_data == MAP_FAILED)
column->data = mmap(NULL,
new_data_size,
PROT_READ | PROT_WRITE,
MAP_SHARED,
column_file_descriptor,
header_size
);
if (column->data == MAP_FAILED)
{
obi_set_errno(OBICOL_UNKNOWN_ERROR);
obidebug(1, "\nError re-mmapping the data of a column after enlarging the file");
@ -1109,35 +1114,6 @@ int obi_enlarge_column(OBIDMS_column_p column)
return -1;
}
// If remap failed: Unmap and map the data again
if (new_data != (column->data)) // TODO check that this works without exception
{
//obidebug(2, "\nEnlarging mapped region failed: Unmap and map the data again, %x != %x", column->data, new_data);
if (munmap(column->data, old_data_size) < 0)
{
obi_set_errno(OBICOL_UNKNOWN_ERROR);
obidebug(1, "\nError munmapping the data of a column before enlarging");
close(column_file_descriptor);
return -1;
}
column->data = mmap(NULL,
new_data_size,
PROT_READ | PROT_WRITE,
MAP_SHARED,
column_file_descriptor,
header_size
);
if (column->data == MAP_FAILED)
{
obi_set_errno(OBICOL_UNKNOWN_ERROR);
obidebug(1, "\nError re-mmapping the data of a column after enlarging the file");
close(column_file_descriptor);
return -1;
}
}
// Set new line count and new data size
(column->header)->line_count = new_line_count;
(column->header)->data_size = new_data_size;