diff options
| -rw-r--r-- | ChangeLog | 12 | ||||
| -rw-r--r-- | nscd/Makefile | 3 | ||||
| -rw-r--r-- | nscd/connections.c | 3 | ||||
| -rw-r--r-- | nscd/nscd-client.h | 1 | ||||
| -rw-r--r-- | nscd/nscd.h | 4 | ||||
| -rw-r--r-- | nscd/nscd_helper.c | 7 | ||||
| -rw-r--r-- | sysdeps/generic/nscd_setup_thread.c | 28 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/nscd_setup_thread.c | 47 |
8 files changed, 99 insertions, 6 deletions
diff --git a/ChangeLog b/ChangeLog index 4338896cd2..57ced8e8e5 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,4 +1,16 @@ 2004-09-08 Ulrich Drepper <drepper@redhat.com> + Jakub Jelinek <jakub@redhat.com> + + * nscd/Makefile (nscd-modules): Add nscd_setup_thread. + * nscd/connections.c (nscd_run): Call setup_thread for maintenance + threads. + * nscd/nscd-client.h (struct database_pers_head): Add + nscd_certainly_running field. + * nscd/nscd.h: Declare setup_thread. + * nscd/nscd_helper.c (__nscd_get_map_ref): Avoid the time test if + nscd_certainly_running is nonzero. + +2004-09-08 Ulrich Drepper <drepper@redhat.com> * nscd/connections.c: Implement r/o sharing of nscd's cache with client processes via shared memory. diff --git a/nscd/Makefile b/nscd/Makefile index 5b3529267a..9be82317d4 100644 --- a/nscd/Makefile +++ b/nscd/Makefile @@ -31,7 +31,8 @@ vpath %.c ../locale/programs nscd-modules := nscd connections pwdcache getpwnam_r getpwuid_r grpcache \ getgrnam_r getgrgid_r hstcache gethstbyad_r gethstbynm2_r \ - dbg_log nscd_conf nscd_stat cache mem xmalloc xstrdup + dbg_log nscd_conf nscd_stat cache mem nscd_setup_thread \ + xmalloc xstrdup ifeq ($(have-thread-library),yes) diff --git a/nscd/connections.c b/nscd/connections.c index 552d554295..2ca6f69cf2 100644 --- a/nscd/connections.c +++ b/nscd/connections.c @@ -770,6 +770,9 @@ nscd_run (void *p) time_t next_prune = run_prune ? time (NULL) + CACHE_PRUNE_INTERVAL : 0; static unsigned long int nready; + if (my_number < lastdb) + setup_thread (&dbs[my_number]); + conn.fd = sock; conn.events = POLLRDNORM; diff --git a/nscd/nscd-client.h b/nscd/nscd-client.h index 708f62d6aa..02a57787b5 100644 --- a/nscd/nscd-client.h +++ b/nscd/nscd-client.h @@ -180,6 +180,7 @@ struct database_pers_head int version; int header_size; int gc_cycle; + int nscd_certainly_running; volatile time_t timestamp; size_t module; diff --git a/nscd/nscd.h b/nscd/nscd.h index 889588cd9a..910fba33be 100644 --- a/nscd/nscd.h +++ b/nscd/nscd.h @@ -195,4 +195,8 @@ extern void readdhstbyaddrv6 (struct database_dyn *db, struct hashentry *he, extern void *mempool_alloc (struct database_dyn *db, size_t len); extern void gc (struct database_dyn *db); + +/* nscd_setup_thread.c */ +extern void setup_thread (struct database_dyn *db); + #endif /* nscd.h */ diff --git a/nscd/nscd_helper.c b/nscd/nscd_helper.c index 95661b6ff3..01c4c81848 100644 --- a/nscd/nscd_helper.c +++ b/nscd/nscd_helper.c @@ -234,11 +234,8 @@ __nscd_get_map_ref (request_type type, const char *name, { /* If not mapped or timestamp not updated, request new map. */ if (cur == NULL - // XXX The following syscalls increases the cost of the entire - // XXX lookup by a factor of 5 but unfortunately there is not - // XXX much we can do except hoping we get a userlevel - // XXX implementation soon. - || cur->head->timestamp + MAPPING_TIMEOUT < time (NULL)) + || (cur->head->nscd_certainly_running == 0 + && cur->head->timestamp + MAPPING_TIMEOUT < time (NULL))) cur = get_mapping (type, name, &mapptr->mapped); if (__builtin_expect (cur != NO_MAPPING, 1)) diff --git a/sysdeps/generic/nscd_setup_thread.c b/sysdeps/generic/nscd_setup_thread.c new file mode 100644 index 0000000000..8ebc050b4a --- /dev/null +++ b/sysdeps/generic/nscd_setup_thread.c @@ -0,0 +1,28 @@ +/* Setup of nscd worker threads. Stub verison. + Copyright (C) 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2004. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <nscd.h> + + +void +setup_thread (struct database_dyn *db) +{ + /* Nothing. */ +} diff --git a/sysdeps/unix/sysv/linux/nscd_setup_thread.c b/sysdeps/unix/sysv/linux/nscd_setup_thread.c new file mode 100644 index 0000000000..3496f02dca --- /dev/null +++ b/sysdeps/unix/sysv/linux/nscd_setup_thread.c @@ -0,0 +1,47 @@ +/* Setup of nscd worker threads. Linux verison. + Copyright (C) 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2004. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <string.h> +#include <unistd.h> +#include <nscd.h> +#include <sysdep.h> + + +void +setup_thread (struct database_dyn *db) +{ + /* Only supported when NPTL is used. */ + char buf[100]; + if (confstr (_CS_GNU_LIBPTHREAD_VERSION, buf, sizeof (buf)) >= sizeof (buf) + || strncmp (buf, "NPTL", 4) != 0) + return; + + /* Do not try this at home, kids. We play with the SETTID address + even thought the process is multi-threaded. This can only work + since none of the threads ever terminates. */ + INTERNAL_SYSCALL_DECL (err); + int r = INTERNAL_SYSCALL (set_tid_address, err, 1, + &db->head->nscd_certainly_running); + if (!INTERNAL_SYSCALL_ERROR_P (r, err)) + /* We know the kernel can reset this field when nscd terminates. + So, set the field to a nonzero value which indicates that nscd + is certainly running and clients can skip the test. */ + db->head->nscd_certainly_running = 1; +} |