fix: conev add/del race

conev.c

@@ -14,6 +14,7 @@ struct poolhd *init_pool(int count)
     }
     pool->max = count;
     pool->count = 0;
+    pool->init_count = 0;
     pool->iters = 0;
 
     #ifndef NOEPOLL
@@ -51,12 +52,17 @@ struct eval *add_event(struct poolhd *pool, enum eid type,
             return 0;
         }
         val = pool->links[c];
-    } while (c && val->del_iter == pool->iters);
+    } while (c < pool->init_count && val->del_iter == pool->iters);
 
+    if (c != pool->count) {
+        struct eval *t = pool->links[c];
+        pool->links[c] = pool->links[pool->count];
+        pool->links[pool->count] = t;
+    }
     memset(val, 0, sizeof(*val));
 
     val->fd = fd;
-    val->index = c;
+    val->index = pool->count;
     val->type = type;
 
     #ifndef NOEPOLL
@@ -68,14 +74,17 @@ struct eval *add_event(struct poolhd *pool, enum eid type,
     }
     val->events = ev.events;
     #else
-    struct pollfd *pfd = &(pool->pevents[c]);
+    struct pollfd *pfd = &(pool->pevents[pool->count]);
 
     pfd->fd = fd;
     pfd->events = POLLIN | e;
     pfd->revents = 0;
     #endif
 
     pool->count++;
+    if (pool->count > pool->init_count) {
+        pool->init_count = pool->count;
+    }
     return val;
 }
 

conev.h

@@ -85,6 +85,7 @@ struct eval {
 
 struct poolhd {
     int max;
+    int init_count;
     int count;
     int efd;
     struct eval **links;

proxy.c

@@ -807,7 +807,7 @@ int event_loop(int srvfd)
             uniperror("(e)poll");
             break;
         }
-        LOG(LOG_L, "new event: fd: %d, evt: %s\n", val->fd, eid_name[val->type]);
+        LOG(LOG_L, "new event: fd: %d, evt: %s, del_iter: %d\n", val->fd, eid_name[val->type], val->del_iter);
 
         if (val->del_iter) {
             continue;