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diff --git a/src/pollable.cc b/src/pollable.cc
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+/**
+ * Copyright (c) 2022, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use 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 Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 <algorithm>
+
+#include "pollable.hh"
+
+#include "base/itertools.hh"
+#include "base/lnav_log.hh"
+
+pollable::pollable(std::shared_ptr<pollable_supervisor> supervisor,
+                   category cat)
+    : p_supervisor(supervisor), p_category(cat)
+{
+    log_debug("pollable attach %p to %p", this, this->p_supervisor.get());
+    this->p_supervisor->attach(this);
+}
+
+pollable::~pollable()
+{
+    log_debug("pollable detach %p from %p", this, this->p_supervisor.get());
+    this->p_supervisor->detach(this);
+}
+
+pollable_supervisor::update_result
+pollable_supervisor::update_poll_set(std::vector<struct pollfd>& pollfds)
+{
+    update_result retval;
+    size_t old_size = pollfds.size();
+
+    for (auto& pol : this->b_components) {
+        pol->update_poll_set(pollfds);
+        switch (pol->get_category()) {
+            case pollable::category::background:
+                retval.ur_background += pollfds.size() - old_size;
+                break;
+            case pollable::category::interactive:
+                retval.ur_interactive += pollfds.size() - old_size;
+                break;
+        }
+        old_size = pollfds.size();
+    }
+
+    return retval;
+}
+
+void
+pollable_supervisor::check_poll_set(const std::vector<struct pollfd>& pollfds)
+{
+    std::vector<pollable*> visited;
+    auto found_new = false;
+
+    // TODO move this loop into the superclass
+    do {
+        found_new = false;
+        for (auto* pol : this->b_components) {
+            if (std::find(visited.begin(), visited.end(), pol) == visited.end())
+            {
+                visited.emplace_back(pol);
+                pol->check_poll_set(pollfds);
+                found_new = true;
+                break;
+            }
+        }
+    } while (found_new);
+}
+
+size_t
+pollable_supervisor::count(pollable::category cat)
+{
+    size_t retval = 0;
+
+    for (const auto* pol : this->b_components) {
+        if (pol->get_category() == cat) {
+            retval += 1;
+        }
+    }
+
+    return retval;
+}
+
+short
+pollfd_revents(const std::vector<struct pollfd>& pollfds, int fd)
+{
+    return pollfds | lnav::itertools::find_if([fd](const auto& entry) {
+               return entry.fd == fd;
+           })
+        | lnav::itertools::deref() | lnav::itertools::map(&pollfd::revents)
+        | lnav::itertools::unwrap_or((short) 0);
+}
+
+bool
+pollfd_ready(const std::vector<struct pollfd>& pollfds, int fd, short events)
+{
+    return std::any_of(
+        pollfds.begin(), pollfds.end(), [fd, events](const auto& entry) {
+            return entry.fd == fd && entry.revents & events;
+        });
+}