--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libfdcore/p_expiry.c	Fri Jan 14 15:15:23 2011 +0900
@@ -0,0 +1,207 @@
+/*********************************************************************************************************
+* Software License Agreement (BSD License)                                                               *
+* Author: Sebastien Decugis <sdecugis@nict.go.jp>							 *
+*													 *
+* Copyright (c) 2010, WIDE Project and NICT								 *
+* All rights reserved.											 *
+* 													 *
+* Redistribution and use of this software in source and binary forms, with or without modification, are  *
+* permitted provided that the following conditions are met:						 *
+* 													 *
+* * Redistributions of source code must retain the above 						 *
+*   copyright notice, this list of conditions and the 							 *
+*   following disclaimer.										 *
+*    													 *
+* * Redistributions in binary form must reproduce the above 						 *
+*   copyright notice, this list of conditions and the 							 *
+*   following disclaimer in the documentation and/or other						 *
+*   materials provided with the distribution.								 *
+* 													 *
+* * Neither the name of the WIDE Project or NICT nor the 						 *
+*   names of its contributors may be used to endorse or 						 *
+*   promote products derived from this software without 						 *
+*   specific prior written permission of WIDE Project and 						 *
+*   NICT.												 *
+* 													 *
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
+* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
+* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
+* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 	 *
+* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 	 *
+* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
+* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF   *
+* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.								 *
+*********************************************************************************************************/
+
+#include "fdcore-internal.h"
+
+/* Delay for garbage collection of expired peers, in seconds */
+#define GC_TIME		120
+
+static pthread_t       exp_thr;
+static pthread_t       gc_thr;
+static struct fd_list  exp_list = FD_LIST_INITIALIZER( exp_list );
+static pthread_cond_t  exp_cnd  = PTHREAD_COND_INITIALIZER;
+static pthread_mutex_t exp_mtx  = PTHREAD_MUTEX_INITIALIZER;
+
+static void * gc_th_fct(void * arg)
+{
+	fd_log_threadname ( "Peers/garb. col." );
+	TRACE_ENTRY( "%p", arg );
+	
+	do {
+		struct fd_list * li, purge = FD_LIST_INITIALIZER(purge);
+		
+		sleep(GC_TIME);	/* sleep is a cancellation point */
+		
+		/* Now check in the peers list if any peer can be deleted */
+		CHECK_FCT_DO( pthread_rwlock_wrlock(&fd_g_peers_rw), goto error );
+		
+		for (li = fd_g_peers.next; li != &fd_g_peers; li = li->next) {
+			struct fd_peer * peer = (struct fd_peer *)li;
+			
+			fd_cpu_flush_cache();
+			if (peer->p_hdr.info.runtime.pir_state != STATE_ZOMBIE)
+				continue;
+			
+			if (peer->p_hdr.info.config.pic_flags.persist == PI_PRST_ALWAYS)
+				continue; /* This peer was not supposed to terminate, keep it in the list for debug */
+			
+			/* Ok, the peer was expired, let's remove it */
+			li = li->prev; /* to avoid breaking the loop */
+			fd_list_unlink(&peer->p_hdr.chain);
+			fd_list_insert_before(&purge, &peer->p_hdr.chain);
+		}
+
+		CHECK_FCT_DO( pthread_rwlock_unlock(&fd_g_peers_rw), goto error );
+		
+		/* Now delete peers that are in the purge list */
+		while (!FD_IS_LIST_EMPTY(&purge)) {
+			struct fd_peer * peer = (struct fd_peer *)(purge.next);
+			fd_list_unlink(&peer->p_hdr.chain);
+			TRACE_DEBUG(INFO, "Garbage Collect: delete zombie peer '%s'", peer->p_hdr.info.pi_diamid);
+			CHECK_FCT_DO( fd_peer_free(&peer), /* Continue... what else to do ? */ );
+		}
+	} while (1);
+	
+error:
+	TRACE_DEBUG(INFO, "An error occurred in peers module! GC thread is terminating...");
+	ASSERT(0);
+	CHECK_FCT_DO(fd_event_send(fd_g_config->cnf_main_ev, FDEV_TERMINATE, 0, NULL), );
+	return NULL;
+}
+
+
+static void * exp_th_fct(void * arg)
+{
+	fd_log_threadname ( "Peers/expire" );
+	TRACE_ENTRY( "%p", arg );
+	
+	CHECK_POSIX_DO( pthread_mutex_lock(&exp_mtx),  goto error );
+	pthread_cleanup_push( fd_cleanup_mutex, &exp_mtx );
+	
+	do {
+		struct timespec	now;
+		struct fd_peer * first;
+		
+		/* Check if there are expiring sessions available */
+		if (FD_IS_LIST_EMPTY(&exp_list)) {
+			/* Just wait for a change or cancelation */
+			CHECK_POSIX_DO( pthread_cond_wait( &exp_cnd, &exp_mtx ), goto error );
+			/* Restart the loop on wakeup */
+			continue;
+		}
+		
+		/* Get the pointer to the peer that expires first */
+		first = (struct fd_peer *)(exp_list.next->o);
+		ASSERT( CHECK_PEER(first) );
+		
+		/* Get the current time */
+		CHECK_SYS_DO(  clock_gettime(CLOCK_REALTIME, &now),  goto error  );
+
+		/* If first peer is not expired, we just wait until it happens */
+		if ( TS_IS_INFERIOR( &now, &first->p_exp_timer ) ) {
+			
+			CHECK_POSIX_DO2(  pthread_cond_timedwait( &exp_cnd, &exp_mtx, &first->p_exp_timer ),  
+					ETIMEDOUT, /* ETIMEDOUT is a normal return value, continue */,
+					/* on other error, */ goto error );
+	
+			/* on wakeup, loop */
+			continue;
+		}
+		
+		/* Now, the first peer in the list is expired; signal it */
+		fd_list_unlink( &first->p_expiry );
+		CHECK_FCT_DO( fd_event_send(first->p_events, FDEVP_TERMINATE, 0, "DO_NOT_WANT_TO_TALK_TO_YOU"), goto error );
+		
+	} while (1);
+	
+	pthread_cleanup_pop( 1 );
+error:
+	TRACE_DEBUG(INFO, "An error occurred in peers module! Expiry thread is terminating...");
+	ASSERT(0);
+	CHECK_FCT_DO(fd_event_send(fd_g_config->cnf_main_ev, FDEV_TERMINATE, 0, NULL), );
+	return NULL;
+}
+
+/* Initialize peers expiry mechanism */
+int fd_p_expi_init(void)
+{
+	TRACE_ENTRY();
+	CHECK_FCT( pthread_create( &exp_thr, NULL, exp_th_fct, NULL ) );
+	CHECK_FCT( pthread_create( &gc_thr,  NULL, gc_th_fct,  NULL ) );
+	return 0;
+}
+
+/* Finish peers expiry mechanism */
+int fd_p_expi_fini(void)
+{
+	CHECK_FCT_DO( fd_thr_term(&exp_thr), );
+	CHECK_POSIX( pthread_mutex_lock(&exp_mtx) );
+	while (!FD_IS_LIST_EMPTY(&exp_list)) {
+		struct fd_peer * peer = (struct fd_peer *)(exp_list.next->o);
+		fd_list_unlink(&peer->p_expiry );
+	}
+	CHECK_POSIX( pthread_mutex_unlock(&exp_mtx) );
+	
+	CHECK_FCT_DO( fd_thr_term(&gc_thr), );
+	return 0;
+}
+
+/* Add / requeue a peer in the expiry list */
+int fd_p_expi_update(struct fd_peer * peer )
+{
+	TRACE_ENTRY("%p", peer);
+	CHECK_PARAMS( CHECK_PEER(peer) );
+	
+	CHECK_POSIX( pthread_mutex_lock(&exp_mtx) );
+	
+	fd_list_unlink(&peer->p_expiry );
+	
+	/* if peer expires */
+	if (peer->p_hdr.info.config.pic_flags.exp) {
+		struct fd_list * li;
+		
+		/* update the p_exp_timer value */
+		CHECK_SYS(  clock_gettime(CLOCK_REALTIME, &peer->p_exp_timer)  );
+		peer->p_exp_timer.tv_sec += peer->p_hdr.info.config.pic_lft;
+		
+		/* add to the expiry list in appropriate position (probably around the end) */
+		for (li = exp_list.prev; li != &exp_list; li = li->prev) {
+			struct fd_peer * p = (struct fd_peer *)(li->o);
+			if (TS_IS_INFERIOR( &p->p_exp_timer, &peer->p_exp_timer ) )
+				break;
+		}
+		
+		fd_list_insert_after(li, &peer->p_expiry);
+		
+		/* signal the expiry thread if we added in first position */
+		if (li == &exp_list) {
+			CHECK_POSIX( pthread_cond_signal(&exp_cnd) );
+		}
+	}
+	
+	CHECK_POSIX( pthread_mutex_unlock(&exp_mtx) );
+	return 0;
+}
+