oysteikt/mpd
0
0
Fork 0
Code Issues Pull Requests Releases Activity

state_file: save only if something has changed

Browse Source 
If nothing has changed since the last save, don't save the state
file.  Saving will spin up the hard drive, which is undesirable on
hosts where MPD is idling in background.
This commit is contained in:
Max Kellermann
2009-10-08 15:22:39 +02:00
parent 1e663b1869
commit ecb118f1ed
9 changed files with 87 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
src/state_file.c
View File

@@ -36,6 +36,13 @@ static char *state_file_path;
/** the GLib source id for the save timer */
static guint save_state_source_id;
/**
* These version numbers determine whether we need to save the state
* file. If nothing has changed, we won't let the hard drive spin up.
*/
static unsigned prev_volume_version, prev_output_version,
prev_playlist_version;
static void
state_file_write(void)
{
@@ -57,6 +64,10 @@ state_file_write(void)
playlist_state_save(fp, &g_playlist);
while(fclose(fp) && errno == EINTR) /* nothing */;
prev_volume_version = sw_volume_state_get_hash();
prev_output_version = audio_output_state_get_version();
prev_playlist_version = playlist_state_get_hash(&g_playlist);
}
static void
@@ -88,6 +99,10 @@ state_file_read(void)
}
while(fclose(fp) && errno == EINTR) /* nothing */;
prev_volume_version = sw_volume_state_get_hash();
prev_output_version = audio_output_state_get_version();
prev_playlist_version = playlist_state_get_hash(&g_playlist);
}
/**
@@ -97,6 +112,13 @@ state_file_read(void)
static gboolean
timer_save_state_file(G_GNUC_UNUSED gpointer data)
{
if (prev_volume_version == sw_volume_state_get_hash() &&
prev_output_version == audio_output_state_get_version() &&
prev_playlist_version == playlist_state_get_hash(&g_playlist))
/* nothing has changed - don't save the state file,
don't spin up the hard disk */
return true;
state_file_write();
return true;
}