j3d1/tinc
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Nearly tickless tinc.

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Use pselect instead of select in main_loop (if available). This lets
tincd sleeps as long as there is nothing to do.
This commit is contained in:
Loïc Grenié 2011-06-04 09:05:23 +02:00 • committed by Guus Sliepen
parent 64771f73eb
commit 50af33d01f
7 changed files with 63 additions and 15 deletions
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57
src/net.c
View file

@ -42,6 +42,9 @@
bool do_purge = false;
volatile bool running = false;
#ifdef HAVE_PSELECT
bool graph_dump = false;
#endif
time_t now = 0;
int contradicting_add_edge = 0;
@ -229,14 +232,14 @@ static void check_dead_connections(void) {
next = node->next;
c = node->data;
if(c->last_ping_time + pingtimeout < now) {
if(c->last_ping_time + pingtimeout <= now) {
if(c->status.active) {
if(c->status.pinged) {
ifdebug(CONNECTIONS) logger(LOG_INFO, "%s (%s) didn't respond to PING in %ld seconds",
c->name, c->hostname, now - c->last_ping_time);
c->status.timeout = true;
terminate_connection(c, true);
} else if(c->last_ping_time + pinginterval < now) {
} else if(c->last_ping_time + pinginterval <= now) {
send_ping(c);
}
} else {
@ -258,7 +261,7 @@ static void check_dead_connections(void) {
}
}
if(c->outbuflen > 0 && c->last_flushed_time + pingtimeout < now) {
if(c->outbuflen > 0 && c->last_flushed_time + pingtimeout <= now) {
if(c->status.active) {
ifdebug(CONNECTIONS) logger(LOG_INFO,
"%s (%s) could not flush for %ld seconds (%d bytes remaining)",
@ -350,7 +353,13 @@ static void check_network_activity(fd_set * readset, fd_set * writeset) {
*/
int main_loop(void) {
fd_set readset, writeset;
#ifdef HAVE_PSELECT
struct timespec tv;
sigset_t omask, block_mask;
time_t next_event;
#else
struct timeval tv;
#endif
int r, maxfd;
time_t last_ping_check, last_config_check, last_graph_dump;
event_t *event;
@ -361,21 +370,48 @@ int main_loop(void) {
srand(now);
#ifdef HAVE_PSELECT
if(lookup_config(config_tree, "GraphDumpFile"))
graph_dump = true;
/* Block SIGHUP & SIGALRM */
sigemptyset(&block_mask);
sigaddset(&block_mask, SIGHUP);
sigaddset(&block_mask, SIGALRM);
sigprocmask(SIG_BLOCK, &block_mask, &omask);
#endif
running = true;
while(running) {
now = time(NULL);
#ifdef HAVE_PSELECT
next_event = last_ping_check + pingtimeout;
if(graph_dump && next_event > last_graph_dump + 60)
next_event = last_graph_dump + 60;
// tv.tv_sec = 1 + (rand() & 7); /* Approx. 5 seconds, randomized to prevent global synchronisation effects */
if((event = peek_next_event()) && next_event > event->time)
next_event = event->time;
if(next_event <= now)
tv.tv_sec = 0;
else
tv.tv_sec = next_event - now;
tv.tv_nsec = 0;
#else
tv.tv_sec = 1;
tv.tv_usec = 0;
#endif
maxfd = build_fdset(&readset, &writeset);
#ifdef HAVE_MINGW
LeaveCriticalSection(&mutex);
#endif
#ifdef HAVE_PSELECT
r = pselect(maxfd + 1, &readset, &writeset, NULL, &tv, &omask);
#else
r = select(maxfd + 1, &readset, &writeset, NULL, &tv);
#endif
now = time(NULL);
#ifdef HAVE_MINGW
EnterCriticalSection(&mutex);
#endif
@ -398,7 +434,7 @@ int main_loop(void) {
/* Let's check if everybody is still alive */
if(last_ping_check + pingtimeout < now) {
if(last_ping_check + pingtimeout <= now) {
check_dead_connections();
last_ping_check = now;
@ -409,7 +445,7 @@ int main_loop(void) {
/* Should we regenerate our key? */
if(keyexpires < now) {
if(keyexpires <= now) {
avl_node_t *node;
node_t *n;
@ -550,11 +586,16 @@ int main_loop(void) {
/* Dump graph if wanted every 60 seconds*/
if(last_graph_dump + 60 < now) {
if(last_graph_dump + 60 <= now) {
dump_graph();
last_graph_dump = now;
}
}
#ifdef HAVE_PSELECT
/* Restore SIGHUP & SIGALARM mask */
sigprocmask(SIG_SETMASK, &omask, NULL);
#endif
return 0;
}