Cap time to sleep to 10 ms when failing to acquire a lock

diff --git a/src/lockfile.c b/src/lockfile.c
index 9d1a49db2f3d499422d571853d9bed4e270ef0ff..0bdb87739e4d29a62873b0484a1a01121e1f88fe 100644 (file)
--- a/src/lockfile.c
+++ b/src/lockfile.c
@@ -1,4 +1,4 @@
-// Copyright (C) 2010-2018 Joel Rosdahl
+// Copyright (C) 2010-2020 Joel Rosdahl
 //
 // 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
@@ -34,6 +34,7 @@ lockfile_acquire(const char *path, unsigned staleness_limit)
        const char *hostname = get_hostname();
        bool acquired = false;
        unsigned to_sleep = 1000; // Microseconds.
+       unsigned max_to_sleep = 10000; // Microseconds.
        unsigned slept = 0; // Microseconds.
 
        while (true) {
@@ -164,7 +165,7 @@ lockfile_acquire(const char *path, unsigned staleness_limit)
                       lockfile, to_sleep);
                usleep(to_sleep);
                slept += to_sleep;
-               to_sleep *= 2;
+               to_sleep = MIN(max_to_sleep, 2 * to_sleep);
        }
 
 out: