logger: avoid polling without watchers

Inspired by #768 - logger thread would wake up once per second looking
for watchers or log entries, but without any watchers. Now sleeps on a
condition.

Note that if I ever actually get logger to syslog/stdout/stderr/etc
working properly this will still always poll.

1 files changed, 1 insertions, 0 deletions

diff --git a/logger.h b/logger.h
index 5492f72..0f5377c 100644
--- a/logger.h
+++ b/logger.h
@@ -162,6 +162,7 @@ typedef struct  {
     int sfd; /* client fd */
     int id; /* id number for watcher list */
     uint64_t skipped; /* lines skipped since last successful print */
+    uint64_t min_gid; /* don't show log entries older than this GID */
     bool failed_flush; /* recently failed to write out (EAGAIN), wait before retry */
     enum logger_watcher_type t; /* stderr, client, syslog, etc */
     uint16_t eflags; /* flags we are interested in */