diff --git a/src/tools/list-threads.c b/src/tools/list-threads.c
new file mode 100644
index 00000000..42bfc1db
--- /dev/null
+++ b/src/tools/list-threads.c
@@ -0,0 +1,92 @@
+/* list-threads.c
+ *
+ * Copyright 2019 Christian Hergert <chergert@redhat.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include <fcntl.h>
+#include <stdlib.h>
+#include <glib.h>
+#include <sysprof-capture.h>
+#include <unistd.h>
+
+static gboolean
+foreach_cb (const SysprofCaptureFrame *frame,
+            gpointer                   user_data)
+{
+  const SysprofCaptureSample *sample = (SysprofCaptureSample *)frame;
+  GHashTable *seen = user_data;
+
+  if (!g_hash_table_contains (seen, GINT_TO_POINTER (sample->tid)))
+    g_hash_table_insert (seen,
+                         GINT_TO_POINTER (sample->tid),
+                         GINT_TO_POINTER (frame->pid));
+
+  return TRUE;
+}
+
+gint
+main (gint   argc,
+      gchar *argv[])
+{
+  static const SysprofCaptureFrameType types[] = {
+    SYSPROF_CAPTURE_FRAME_SAMPLE,
+  };
+  g_autoptr(GHashTable) seen = NULL;
+  g_autoptr(SysprofCaptureReader) reader = NULL;
+  g_autoptr(SysprofCaptureCursor) cursor = NULL;
+
+  if (argc != 2)
+    {
+      g_printerr ("usage: %s CAPTURE_FILE\n", argv[0]);
+      return EXIT_FAILURE;
+    }
+
+  if (g_strcmp0 ("-", argv[1]) == 0)
+    reader = sysprof_capture_reader_new_from_fd (dup (STDIN_FILENO), 0);
+  else
+    reader = sysprof_capture_reader_new (argv[1], 0);
+
+  if (reader == NULL)
+    {
+      g_printerr ("Failed to open %s capture\n", argv[1]);
+      return EXIT_FAILURE;
+    }
+
+  seen = g_hash_table_new (NULL, NULL);
+
+  cursor = sysprof_capture_cursor_new (reader);
+  sysprof_capture_cursor_add_condition (cursor,
+      sysprof_capture_condition_new_where_type_in (G_N_ELEMENTS (types), types));
+  sysprof_capture_cursor_foreach (cursor, foreach_cb, seen);
+
+  {
+    GHashTableIter iter;
+    gpointer k, v;
+
+    g_hash_table_iter_init (&iter, seen);
+
+    while (g_hash_table_iter_next (&iter, &k, &v))
+      {
+        g_print ("pid=%d  tid=%d\n",
+                 GPOINTER_TO_INT (v),
+                 GPOINTER_TO_INT (k));
+      }
+  }
+
+  return EXIT_SUCCESS;
+}
diff --git a/src/tools/meson.build b/src/tools/meson.build
index 3c812354..5c6c1910 100644
--- a/src/tools/meson.build
+++ b/src/tools/meson.build
@@ -27,3 +27,8 @@ sysprof_profiler_ctl = executable('sysprof-profiler-ctl',
   dependencies: [ tools_deps, gio_unix_dep ],
        install: false,
 )
+
+list_threads = executable('list-threads', ['list-threads.c'],
+  dependencies: [ tools_deps ],
+       install: false,
+)