diff options
Diffstat (limited to 'bfd/cache.c')
| -rw-r--r-- | bfd/cache.c | 38 |
1 files changed, 32 insertions, 6 deletions
diff --git a/bfd/cache.c b/bfd/cache.c index 5226816..4d46936 100644 --- a/bfd/cache.c +++ b/bfd/cache.c @@ -31,7 +31,7 @@ SECTION regard to the underlying operating system's file descriptor limit (often as low as 20 open files). The module in <<cache.c>> maintains a least recently used list of - <<BFD_CACHE_MAX_OPEN>> files, and exports the name + <<bfd_cache_max_open>> files, and exports the name <<bfd_cache_lookup>>, which runs around and makes sure that the required BFD is open. If not, then it chooses a file to close, closes it and opens the one wanted, returning its file @@ -67,9 +67,35 @@ enum cache_flag { }; /* The maximum number of files which the cache will keep open at - one time. */ + one time. When needed call bfd_cache_max_open to initialize. */ -#define BFD_CACHE_MAX_OPEN 10 +static int max_open_files = 0; + +/* Set max_open_files, if not already set, to 12.5% of the allowed open + file descriptors, but at least 10, and return the value. */ +static int +bfd_cache_max_open (void) +{ + if (max_open_files == 0) + { + int max; +#ifdef HAVE_GETRLIMIT + struct rlimit rlim; + if (getrlimit (RLIMIT_NOFILE, &rlim) == 0 + && rlim.rlim_cur != RLIM_INFINITY) + max = rlim.rlim_cur / 8; + else +#endif /* HAVE_GETRLIMIT */ +#ifdef _SC_OPEN_MAX + max = sysconf (_SC_OPEN_MAX) / 8; +#else + max = 10; +#endif /* _SC_OPEN_MAX */ + max_open_files = max < 10 ? 10 : max; + } + + return max_open_files; +} /* The number of BFD files we have open. */ @@ -187,7 +213,7 @@ close_one (void) /* Called when the macro <<bfd_cache_lookup>> fails to find a quick answer. Find a file descriptor for @var{abfd}. If necessary, it open it. If there are already more than - <<BFD_CACHE_MAX_OPEN>> files open, it tries to close one first, to + <<bfd_cache_max_open>> files open, it tries to close one first, to avoid running out of file descriptors. It will return NULL if it is unable to (re)open the @var{abfd}. */ @@ -466,7 +492,7 @@ bfd_boolean bfd_cache_init (bfd *abfd) { BFD_ASSERT (abfd->iostream != NULL); - if (open_files >= BFD_CACHE_MAX_OPEN) + if (open_files >= bfd_cache_max_open ()) { if (! close_one ()) return FALSE; @@ -553,7 +579,7 @@ bfd_open_file (bfd *abfd) { abfd->cacheable = TRUE; /* Allow it to be closed later. */ - if (open_files >= BFD_CACHE_MAX_OPEN) + if (open_files >= bfd_cache_max_open ()) { if (! close_one ()) return NULL; |