Writing metadata xattr on directories with sticky bit set, FR#94

[netatalk.git] / libevent / bufferevent_ratelim.c

diff --git a/libevent/bufferevent_ratelim.c b/libevent/bufferevent_ratelim.c
index 85904e828bde3a85f089304df7042a640a269ddd..7965390ee66be91217b90de9bf0c6ce30538e4ff 100644 (file)
--- a/libevent/bufferevent_ratelim.c
+++ b/libevent/bufferevent_ratelim.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007-2010 Niels Provos and Nick Mathewson
+ * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
  * Copyright (c) 2002-2006 Niels Provos <provos@citi.umich.edu>
  * All rights reserved.
  *
@@ -43,6 +43,7 @@
 #include "bufferevent-internal.h"
 #include "mm-internal.h"
 #include "util-internal.h"
+#include "event-internal.h"
 
 int
 ev_token_bucket_init(struct ev_token_bucket *bucket,
@@ -165,7 +166,8 @@ ev_token_bucket_cfg_new(size_t read_rate, size_t read_burst,
        r->read_maximum = read_burst;
        r->write_maximum = write_burst;
        memcpy(&r->tick_timeout, tick_len, sizeof(struct timeval));
-       r->msec_per_tick = (tick_len->tv_sec * 1000) + tick_len->tv_usec/1000;
+       r->msec_per_tick = (tick_len->tv_sec * 1000) +
+           (tick_len->tv_usec & COMMON_TIMEOUT_MICROSECONDS_MASK)/1000;
        return r;
 }
 
@@ -187,6 +189,8 @@ ev_token_bucket_cfg_free(struct ev_token_bucket_cfg *cfg)
 
 static int _bev_group_suspend_reading(struct bufferevent_rate_limit_group *g);
 static int _bev_group_suspend_writing(struct bufferevent_rate_limit_group *g);
+static void _bev_group_unsuspend_reading(struct bufferevent_rate_limit_group *g);
+static void _bev_group_unsuspend_writing(struct bufferevent_rate_limit_group *g);
 
 /** Helper: figure out the maximum amount we should write if is_write, or
     the maximum amount we should read if is_read.  Return that maximum, or
@@ -283,6 +287,10 @@ _bufferevent_decrement_read_buckets(struct bufferevent_private *bev, ev_ssize_t
                        if (event_add(&bev->rate_limiting->refill_bucket_event,
                                &bev->rate_limiting->cfg->tick_timeout) < 0)
                                r = -1;
+               } else if (bev->read_suspended & BEV_SUSPEND_BW) {
+                       if (!(bev->write_suspended & BEV_SUSPEND_BW))
+                               event_del(&bev->rate_limiting->refill_bucket_event);
+                       bufferevent_unsuspend_read(&bev->bev, BEV_SUSPEND_BW);
                }
        }
 
@@ -292,6 +300,8 @@ _bufferevent_decrement_read_buckets(struct bufferevent_private *bev, ev_ssize_t
                bev->rate_limiting->group->total_read += bytes;
                if (bev->rate_limiting->group->rate_limit.read_limit <= 0) {
                        _bev_group_suspend_reading(bev->rate_limiting->group);
+               } else if (bev->rate_limiting->group->read_suspended) {
+                       _bev_group_unsuspend_reading(bev->rate_limiting->group);
                }
                UNLOCK_GROUP(bev->rate_limiting->group);
        }
@@ -315,6 +325,10 @@ _bufferevent_decrement_write_buckets(struct bufferevent_private *bev, ev_ssize_t
                        if (event_add(&bev->rate_limiting->refill_bucket_event,
                                &bev->rate_limiting->cfg->tick_timeout) < 0)
                                r = -1;
+               } else if (bev->write_suspended & BEV_SUSPEND_BW) {
+                       if (!(bev->read_suspended & BEV_SUSPEND_BW))
+                               event_del(&bev->rate_limiting->refill_bucket_event);
+                       bufferevent_unsuspend_write(&bev->bev, BEV_SUSPEND_BW);
                }
        }
 
@@ -324,6 +338,8 @@ _bufferevent_decrement_write_buckets(struct bufferevent_private *bev, ev_ssize_t
                bev->rate_limiting->group->total_written += bytes;
                if (bev->rate_limiting->group->rate_limit.write_limit <= 0) {
                        _bev_group_suspend_writing(bev->rate_limiting->group);
+               } else if (bev->rate_limiting->group->write_suspended) {
+                       _bev_group_unsuspend_writing(bev->rate_limiting->group);
                }
                UNLOCK_GROUP(bev->rate_limiting->group);
        }
@@ -518,6 +534,7 @@ _bev_group_refill_callback(evutil_socket_t fd, short what, void *arg)
        event_base_gettimeofday_cached(event_get_base(&g->master_refill_event), &now);
 
        LOCK_GROUP(g);
+
        tick = ev_token_bucket_get_tick(&now, &g->rate_limit_cfg);
        ev_token_bucket_update(&g->rate_limit, &g->rate_limit_cfg, tick);
 
@@ -636,13 +653,15 @@ bufferevent_rate_limit_group_new(struct event_base *base,
 
        ev_token_bucket_init(&g->rate_limit, cfg, tick, 0);
 
-       g->min_share = 64;
        event_assign(&g->master_refill_event, base, -1, EV_PERSIST,
            _bev_group_refill_callback, g);
        /*XXXX handle event_add failure */
        event_add(&g->master_refill_event, &cfg->tick_timeout);
 
        EVTHREAD_ALLOC_LOCK(g->lock, EVTHREAD_LOCKTYPE_RECURSIVE);
+
+       bufferevent_rate_limit_group_set_min_share(g, 64);
+
        return g;
 }
 
@@ -670,6 +689,9 @@ bufferevent_rate_limit_group_set_cfg(
                event_add(&g->master_refill_event, &cfg->tick_timeout);
        }
 
+       /* The new limits might force us to adjust min_share differently. */
+       bufferevent_rate_limit_group_set_min_share(g, g->configured_min_share);
+
        UNLOCK_GROUP(g);
        return 0;
 }
@@ -682,6 +704,15 @@ bufferevent_rate_limit_group_set_min_share(
        if (share > EV_SSIZE_MAX)
                return -1;
 
+       g->configured_min_share = share;
+
+       /* Can't set share to less than the one-tick maximum.  IOW, at steady
+        * state, at least one connection can go per tick. */
+       if (share > g->rate_limit_cfg.read_rate)
+               share = g->rate_limit_cfg.read_rate;
+       if (share > g->rate_limit_cfg.write_rate)
+               share = g->rate_limit_cfg.write_rate;
+
        g->min_share = share;
        return 0;
 }