mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-30 22:41:06 +00:00
(client_queued): New variable. (nscd_run): Revamp the loop. Don't call poll except for cleanup threads. Keep track of the number of delays caused because of busy worker threads.
This commit is contained in:
Ulrich Drepper
parent
bf7725a9bc
commit
0fdb4f42e4
@ -19,6 +19,7 @@
|
||||
02111-1307 USA. */
|
||||
|
||||
#include <assert.h>
|
||||
#include <atomic.h>
|
||||
#include <error.h>
|
||||
#include <errno.h>
|
||||
#include <grp.h>
|
||||
@ -130,6 +131,9 @@ int nthreads = -1;
|
||||
/* Socket for incoming connections. */
|
||||
static int sock;
|
||||
|
||||
/* Number of times clients had to wait. */
|
||||
unsigned long int client_queued;
|
||||
|
||||
|
||||
/* Initialize database information structures. */
|
||||
void
|
||||
@ -435,145 +439,163 @@ nscd_run (void *p)
|
||||
long int my_number = (long int) p;
|
||||
struct pollfd conn;
|
||||
int run_prune = my_number < lastdb && dbs[my_number].enabled;
|
||||
time_t now = time (NULL);
|
||||
time_t next_prune = now + CACHE_PRUNE_INTERVAL;
|
||||
int timeout = run_prune ? 1000 * (next_prune - now) : -1;
|
||||
time_t next_prune = run_prune ? time (NULL) + CACHE_PRUNE_INTERVAL : 0;
|
||||
static unsigned long int nready;
|
||||
|
||||
conn.fd = sock;
|
||||
conn.events = POLLRDNORM;
|
||||
|
||||
while (1)
|
||||
{
|
||||
int nr = poll (&conn, 1, timeout);
|
||||
int nr;
|
||||
|
||||
if (nr == 0)
|
||||
/* One more thread available. */
|
||||
atomic_increment (&nready);
|
||||
|
||||
no_conn:
|
||||
if (run_prune)
|
||||
do
|
||||
{
|
||||
time_t now = time (NULL);
|
||||
int timeout = now < next_prune ? 1000 * (next_prune - now) : 0;
|
||||
|
||||
nr = poll (&conn, 1, timeout);
|
||||
|
||||
if (nr == 0)
|
||||
{
|
||||
/* The `poll' call timed out. It's time to clean up the
|
||||
cache. */
|
||||
atomic_decrement (&nready);
|
||||
assert (my_number < lastdb);
|
||||
prune_cache (&dbs[my_number], time(NULL));
|
||||
now = time (NULL);
|
||||
next_prune = now + CACHE_PRUNE_INTERVAL;
|
||||
goto try_get;
|
||||
}
|
||||
}
|
||||
while ((conn.revents & POLLRDNORM) == 0);
|
||||
|
||||
got_data:;
|
||||
/* We have a new incoming connection. Accept the connection. */
|
||||
int fd = TEMP_FAILURE_RETRY (accept (conn.fd, NULL, NULL));
|
||||
request_header req;
|
||||
char buf[256];
|
||||
uid_t uid = 0;
|
||||
#ifdef SO_PEERCRED
|
||||
pid_t pid = 0;
|
||||
#endif
|
||||
|
||||
if (__builtin_expect (fd, 0) < 0)
|
||||
{
|
||||
/* The `poll' call timed out. It's time to clean up the cache. */
|
||||
assert (my_number < lastdb);
|
||||
now = time (NULL);
|
||||
prune_cache (&dbs[my_number], now);
|
||||
next_prune = now + CACHE_PRUNE_INTERVAL;
|
||||
timeout = 1000 * (next_prune - now);
|
||||
dbg_log (_("while accepting connection: %s"),
|
||||
strerror_r (errno, buf, sizeof (buf)));
|
||||
goto no_conn;
|
||||
}
|
||||
|
||||
/* This thread is busy. */
|
||||
atomic_decrement (&nready);
|
||||
|
||||
/* Now read the request. */
|
||||
if (__builtin_expect (TEMP_FAILURE_RETRY (read (fd, &req, sizeof (req)))
|
||||
!= sizeof (req), 0))
|
||||
{
|
||||
if (debug_level > 0)
|
||||
dbg_log (_("short read while reading request: %s"),
|
||||
strerror_r (errno, buf, sizeof (buf)));
|
||||
close (fd);
|
||||
continue;
|
||||
}
|
||||
|
||||
/* We have a new incoming connection. */
|
||||
if (conn.revents & (POLLRDNORM|POLLERR|POLLHUP|POLLNVAL))
|
||||
{
|
||||
/* Accept the connection. */
|
||||
int fd = TEMP_FAILURE_RETRY (accept (conn.fd, NULL, NULL));
|
||||
request_header req;
|
||||
char buf[256];
|
||||
uid_t uid = 0;
|
||||
/* Some systems have no SO_PEERCRED implementation. They don't
|
||||
care about security so we don't as well. */
|
||||
#ifdef SO_PEERCRED
|
||||
pid_t pid = 0;
|
||||
#endif
|
||||
if (secure_in_use)
|
||||
{
|
||||
struct ucred caller;
|
||||
socklen_t optlen = sizeof (caller);
|
||||
|
||||
if (__builtin_expect (fd, 0) < 0)
|
||||
if (getsockopt (fd, SOL_SOCKET, SO_PEERCRED, &caller, &optlen) < 0)
|
||||
{
|
||||
dbg_log (_("while accepting connection: %s"),
|
||||
dbg_log (_("error getting callers id: %s"),
|
||||
strerror_r (errno, buf, sizeof (buf)));
|
||||
close (fd);
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Now read the request. */
|
||||
if (__builtin_expect (TEMP_FAILURE_RETRY (read (fd, &req,
|
||||
sizeof (req)))
|
||||
!= sizeof (req), 0))
|
||||
if (req.type < GETPWBYNAME || req.type > LASTDBREQ
|
||||
|| secure[serv2db[req.type]])
|
||||
uid = caller.uid;
|
||||
|
||||
pid = caller.pid;
|
||||
}
|
||||
else if (__builtin_expect (debug_level > 0, 0))
|
||||
{
|
||||
struct ucred caller;
|
||||
socklen_t optlen = sizeof (caller);
|
||||
|
||||
if (getsockopt (fd, SOL_SOCKET, SO_PEERCRED, &caller, &optlen) == 0)
|
||||
pid = caller.pid;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* It should not be possible to crash the nscd with a silly
|
||||
request (i.e., a terribly large key). We limit the size to 1kb. */
|
||||
if (__builtin_expect (req.key_len, 1) < 0
|
||||
|| __builtin_expect (req.key_len, 1) > 1024)
|
||||
{
|
||||
if (debug_level > 0)
|
||||
dbg_log (_("key length in request too long: %d"), req.key_len);
|
||||
close (fd);
|
||||
continue;
|
||||
}
|
||||
else
|
||||
{
|
||||
/* Get the key. */
|
||||
char keybuf[req.key_len];
|
||||
|
||||
if (__builtin_expect (TEMP_FAILURE_RETRY (read (fd, keybuf,
|
||||
req.key_len))
|
||||
!= req.key_len, 0))
|
||||
{
|
||||
if (debug_level > 0)
|
||||
dbg_log (_("short read while reading request: %s"),
|
||||
dbg_log (_("short read while reading request key: %s"),
|
||||
strerror_r (errno, buf, sizeof (buf)));
|
||||
close (fd);
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Some systems have no SO_PEERCRED implementation. They don't
|
||||
care about security so we don't as well. */
|
||||
if (__builtin_expect (debug_level, 0) > 0)
|
||||
{
|
||||
#ifdef SO_PEERCRED
|
||||
if (secure_in_use)
|
||||
{
|
||||
struct ucred caller;
|
||||
socklen_t optlen = sizeof (caller);
|
||||
|
||||
if (getsockopt (fd, SOL_SOCKET, SO_PEERCRED,
|
||||
&caller, &optlen) < 0)
|
||||
{
|
||||
dbg_log (_("error getting callers id: %s"),
|
||||
strerror_r (errno, buf, sizeof (buf)));
|
||||
close (fd);
|
||||
continue;
|
||||
}
|
||||
|
||||
if (req.type < GETPWBYNAME || req.type > LASTDBREQ
|
||||
|| secure[serv2db[req.type]])
|
||||
uid = caller.uid;
|
||||
|
||||
pid = caller.pid;
|
||||
}
|
||||
else if (__builtin_expect (debug_level > 0, 0))
|
||||
{
|
||||
struct ucred caller;
|
||||
socklen_t optlen = sizeof (caller);
|
||||
|
||||
if (getsockopt (fd, SOL_SOCKET, SO_PEERCRED,
|
||||
&caller, &optlen) == 0)
|
||||
pid = caller.pid;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* It should not be possible to crash the nscd with a silly
|
||||
request (i.e., a terribly large key). We limit the size
|
||||
to 1kb. */
|
||||
if (__builtin_expect (req.key_len, 1) < 0
|
||||
|| __builtin_expect (req.key_len, 1) > 1024)
|
||||
{
|
||||
if (debug_level > 0)
|
||||
dbg_log (_("key length in request too long: %d"), req.key_len);
|
||||
close (fd);
|
||||
continue;
|
||||
}
|
||||
else
|
||||
{
|
||||
/* Get the key. */
|
||||
char keybuf[req.key_len];
|
||||
|
||||
if (__builtin_expect (TEMP_FAILURE_RETRY (read (fd, keybuf,
|
||||
req.key_len))
|
||||
!= req.key_len, 0))
|
||||
{
|
||||
if (debug_level > 0)
|
||||
dbg_log (_("short read while reading request key: %s"),
|
||||
strerror_r (errno, buf, sizeof (buf)));
|
||||
close (fd);
|
||||
continue;
|
||||
}
|
||||
|
||||
if (__builtin_expect (debug_level, 0) > 0)
|
||||
{
|
||||
#ifdef SO_PEERCRED
|
||||
if (pid != 0)
|
||||
dbg_log (_("\
|
||||
if (pid != 0)
|
||||
dbg_log (_("\
|
||||
handle_request: request received (Version = %d) from PID %ld"),
|
||||
req.version, (long int) pid);
|
||||
else
|
||||
req.version, (long int) pid);
|
||||
else
|
||||
#endif
|
||||
dbg_log (_("\
|
||||
dbg_log (_("\
|
||||
handle_request: request received (Version = %d)"), req.version);
|
||||
}
|
||||
|
||||
/* Phew, we got all the data, now process it. */
|
||||
handle_request (fd, &req, keybuf, uid);
|
||||
|
||||
/* We are done. */
|
||||
close (fd);
|
||||
}
|
||||
|
||||
/* Phew, we got all the data, now process it. */
|
||||
handle_request (fd, &req, keybuf, uid);
|
||||
|
||||
/* We are done. */
|
||||
close (fd);
|
||||
}
|
||||
|
||||
if (run_prune)
|
||||
/* Just determine whether any data is present. We do this to
|
||||
measure whether clients are queued up. */
|
||||
try_get:
|
||||
nr = poll (&conn, 1, 0);
|
||||
if (nr != 0)
|
||||
{
|
||||
now = time (NULL);
|
||||
timeout = now < next_prune ? 1000 * (next_prune - now) : 0;
|
||||
if (nready == 0)
|
||||
++client_queued;
|
||||
|
||||
atomic_increment (&nready);
|
||||
|
||||
goto got_data;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user