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Resched changes struct state without lock to avoid deadlock.

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Hence connection_get must recheck struct state after obtaining
c_mutex to detect close.
This commit is contained in:
Kurt Zeilenga 1999-06-12 00:29:41 +00:00
parent 35e91be482
commit 18e5e729ac
1 changed files with 12 additions and 9 deletions
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21
servers/slapd/connection.c
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@ -158,14 +158,6 @@ static Connection* connection_get( int s )
assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
if( c->c_struct_state != SLAP_C_USED ) {
/* connection must have been closed */
assert( c->c_conn_state == SLAP_C_INVALID );
assert( !ber_pvt_sb_in_use( c->c_sb ) );
return NULL;
}
#else
c = NULL;
{
@ -199,7 +191,18 @@ static Connection* connection_get( int s )
if( c != NULL ) {
ldap_pvt_thread_mutex_lock( &c->c_mutex );
/* we do this AFTER locking to aid in debugging */
if( c->c_struct_state != SLAP_C_USED ) {
/* connection must have been closed due to resched */
assert( c->c_conn_state == SLAP_C_INVALID );
assert( !ber_pvt_sb_in_use( c->c_sb ) );
Debug( LDAP_DEBUG_TRACE,
"connection_get(%d): connection not used.\n",
s, c->c_connid, 0 );
return NULL;
}
Debug( LDAP_DEBUG_TRACE,
"connection_get(%d): got connid=%ld\n",
s, c->c_connid, 0 );