diff options
Diffstat (limited to 'source/l/glibc/glibc-2.15.nscd-race-fix.diff')
-rw-r--r-- | source/l/glibc/glibc-2.15.nscd-race-fix.diff | 47 |
1 files changed, 0 insertions, 47 deletions
diff --git a/source/l/glibc/glibc-2.15.nscd-race-fix.diff b/source/l/glibc/glibc-2.15.nscd-race-fix.diff deleted file mode 100644 index f1323570..00000000 --- a/source/l/glibc/glibc-2.15.nscd-race-fix.diff +++ /dev/null @@ -1,47 +0,0 @@ ---- c/nscd/nscd_gethst_r.c 2012-01-01 05:16:32.000000000 -0700 -+++ c/nscd/nscd_gethst_r.c 2012-03-28 10:45:51.546600822 -0600 -@@ -101,9 +101,27 @@ libc_freeres_fn (hst_map_free) - uint32_t - __nscd_get_nl_timestamp (void) - { -+ uint32_t retval; - if (__nss_not_use_nscd_hosts != 0) - return 0; - -+ int cnt = 0; -+ /* __nscd_get_mapping can change hst_map_handle.mapped to NO_MAPPING. -+ However, __nscd_get_mapping assumes the prior value was not NO_MAPPING. -+ Thus we have to acquire the lock to prevent this thread from changing -+ hst_map_handle.mapped to NO_MAPPING while another thread is inside -+ __nscd_get_mapping. */ -+ while (__builtin_expect -+ (atomic_compare_and_exchange_val_acq (&__hst_map_handle.lock, -+ 1, 0) != 0, 0)) -+ { -+ // XXX Best number of rounds? -+ if (__builtin_expect (++cnt > 5, 0)) -+ return 0; -+ -+ atomic_delay (); -+ } -+ - struct mapped_database *map = __hst_map_handle.mapped; - - if (map == NULL -@@ -113,9 +131,14 @@ __nscd_get_nl_timestamp (void) - map = __nscd_get_mapping (GETFDHST, "hosts", &__hst_map_handle.mapped); - - if (map == NO_MAPPING) -- return 0; -+ retval = 0; -+ else -+ retval = map->head->extra_data[NSCD_HST_IDX_CONF_TIMESTAMP]; -+ -+ /* Release the lock. */ -+ __hst_map_handle.lock = 0; - -- return map->head->extra_data[NSCD_HST_IDX_CONF_TIMESTAMP]; -+ return retval; - } - - |