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Experiment with busy loop protection...

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This commit is contained in:
Kurt Zeilenga 2001-10-21 00:48:14 +00:00
parent 125165ff97
commit 17264d1ad4
1 changed files with 38 additions and 7 deletions
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45
servers/slapd/daemon.c
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@ -988,6 +988,9 @@ slapd_daemon_task(
ber_socket_t nfds;
#define SLAPD_EBADF_LIMIT 16
int ebadf = 0;
#if defined( EMFILE ) || defined( ENFILE )
int emfile = 0;
#endif
#define SLAPD_IDLE_CHECK_LIMIT 4
time_t now = slap_get_time();
@ -998,14 +1001,18 @@ slapd_daemon_task(
Sockaddr from;
#if defined(SLAPD_RLOOKUPS)
struct hostent *hp;
struct hostent *hp;
#endif
struct timeval zero;
struct timeval *tvp;
if( global_idletimeout > 0 && difftime(
last_idle_check+global_idletimeout/SLAPD_IDLE_CHECK_LIMIT,
now ) < 0 )
if(
#if defined( EMFILE ) || defined( ENFILE )
emfile ||
#endif
( global_idletimeout > 0 && difftime(
last_idle_check+global_idletimeout/SLAPD_IDLE_CHECK_LIMIT,
now ) < 0 ))
{
connections_timeout_idle(now);
}
@ -1194,19 +1201,43 @@ slapd_daemon_task(
(struct sockaddr *) &from, &len );
if ( s == AC_SOCKET_INVALID ) {
int err = sock_errno();
ldap_pvt_thread_yield();
#if defined( EMFILE ) || defined( ENFILE )
#ifdef EMFILE
if( err == EMFILE ) {
emfile++;
} else
#endif
#ifdef ENFILE
if( err == ENFILE ) {
emfile++;
}
#endif
/* prevent busy loop */
# ifdef HAVE_USLEEP
if( emfile % 4 == 3 ) usleep( 250 );
# else
if( emfile % 8 == 7 ) sleep( 1 );
# endif
else continue;
#endif
#ifdef NEW_LOGGING
LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
"slapd_daemon_task: accept(%ld) failed errno=%d (%s)\n",
(long)slap_listeners[l]->sl_sd, err, sock_errstr(err) ));
"slapd_daemon_task: accept(%ld) failed errno=%d (%s)\n",
(long)slap_listeners[l]->sl_sd, err, sock_errstr(err) ));
#else
Debug( LDAP_DEBUG_ANY,
"daemon: accept(%ld) failed errno=%d (%s)\n",
(long) slap_listeners[l]->sl_sd, err,
sock_errstr(err) );
#endif
ldap_pvt_thread_yield();
continue;
}
emfile = 0;
#ifndef HAVE_WINSOCK
/* make sure descriptor number isn't too great */