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Rename temporary object file to cached object file if possible

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This avoids copying the object file unnecessarily in the common case when we
store object files uncompressed in the cache.
This commit is contained in:
Joel Rosdahl 2010-05-09 17:50:20 +02:00
parent f12d64243f
commit c609b16cc0
3 changed files with 19 additions and 2 deletions
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5
ccache.c
View File

@ -594,7 +594,8 @@ static void to_cache(ARGS *args)
failed();
}
if (st.st_size > 0) {
if (move_file(tmp_stderr, cached_stderr, compress) != 0) {
if (move_uncompressed_file(tmp_stderr, cached_stderr,
compress) != 0) {
cc_log("Failed to move %s to %s",
tmp_stderr, cached_stderr);
stats_update(STATS_ERROR);
@ -604,7 +605,7 @@ static void to_cache(ARGS *args)
} else {
unlink(tmp_stderr);
}
if (move_file(tmp_obj, cached_obj, compress) != 0) {
if (move_uncompressed_file(tmp_obj, cached_obj, compress) != 0) {
cc_log("Failed to move %s to %s", tmp_obj, cached_obj);
stats_update(STATS_ERROR);
failed();

2
ccache.h
View File

@ -70,6 +70,8 @@ void fatal(const char *format, ...) ATTR_FORMAT(printf, 1, 2);
void copy_fd(int fd_in, int fd_out);
int copy_file(const char *src, const char *dest, int compress_dest);
int move_file(const char *src, const char *dest, int compress_dest);
int move_uncompressed_file(const char *src, const char *dest,
int compress_dest);
int test_if_compressed(const char *filename);
int create_dir(const char *dir);

14
util.c
View File

@ -259,6 +259,20 @@ int move_file(const char *src, const char *dest, int compress_dest)
return ret;
}
/*
* Like move_file(), but assumes that src is uncompressed and that src and dest
* are on the same file system.
*/
int
move_uncompressed_file(const char *src, const char *dest, int compress_dest)
{
if (compress_dest) {
return move_file(src, dest, compress_dest);
} else {
return rename(src, dest);
}
}
/* test if a file is zlib compressed */
int test_if_compressed(const char *filename)
{