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-rw-r--r--src/directory.c89
1 files changed, 50 insertions, 39 deletions
diff --git a/src/directory.c b/src/directory.c
index 66f652867..04c06af14 100644
--- a/src/directory.c
+++ b/src/directory.c
@@ -32,6 +32,7 @@
#include "dbUtils.h"
#include "song_print.h"
#include "song_save.h"
+#include "main_notify.h"
#define DIRECTORY_DIR "directory: "
#define DIRECTORY_MTIME "mtime: "
@@ -54,11 +55,13 @@ static Directory *mp3rootDirectory;
static time_t directory_dbModTime;
-static volatile int directory_updatePid;
+static sig_atomic_t directory_updatePid;
-static volatile int directory_reReadDB;
+static sig_atomic_t update_exited;
-static volatile mpd_uint16 directory_updateJobId;
+static sig_atomic_t update_status;
+
+static sig_atomic_t directory_updateJobId;
static DirectoryList *newDirectoryList(void);
@@ -108,53 +111,48 @@ static char *getDbFile(void)
return param->value;
}
-static void clearUpdatePid(void)
-{
- directory_updatePid = 0;
-}
-
int isUpdatingDB(void)
{
- if (directory_updatePid > 0 || directory_reReadDB) {
- return directory_updateJobId;
- }
- return 0;
+ return directory_updatePid > 0 ? directory_updateJobId : 0;
}
void directory_sigChldHandler(int pid, int status)
{
if (directory_updatePid == pid) {
- if (WIFSIGNALED(status) && WTERMSIG(status) != SIGTERM) {
- /* ERROR("update process died from a "
- "non-TERM signal: %i\n", WTERMSIG(status)); */
- } else if (!WIFSIGNALED(status)) {
- switch (WEXITSTATUS(status)) {
- case DIRECTORY_UPDATE_EXIT_UPDATE:
- directory_reReadDB = 1;
- /* DEBUG("directory_sigChldHandler: "
- "updated db\n"); */
- case DIRECTORY_UPDATE_EXIT_NOUPDATE:
- /* DEBUG("directory_sigChldHandler: "
- "update exited succesffully\n"); */
- break;
- /*
- default:
- ERROR("error updating db\n");
- */
- }
- }
- clearUpdatePid();
+ update_status = status;
+ update_exited = 1;
+ wakeup_main_task();
}
}
void readDirectoryDBIfUpdateIsFinished(void)
{
- if (directory_reReadDB && 0 == directory_updatePid) {
- DEBUG("readDirectoryDB since update finished successfully\n");
- readDirectoryDB();
- playlistVersionChange();
- directory_reReadDB = 0;
+ int status;
+
+ if (!update_exited)
+ return;
+
+ status = update_status;
+
+ if (WIFSIGNALED(status) && WTERMSIG(status) != SIGTERM) {
+ ERROR("update process died from a non-TERM signal: %d\n",
+ WTERMSIG(status));
+ } else if (!WIFSIGNALED(status)) {
+ switch (WEXITSTATUS(status)) {
+ case DIRECTORY_UPDATE_EXIT_UPDATE:
+ DEBUG("update finished successfully with changes\n");
+ readDirectoryDB();
+ DEBUG("update changes read into memory\n");
+ playlistVersionChange();
+ case DIRECTORY_UPDATE_EXIT_NOUPDATE:
+ DEBUG("update exited successfully with no changes\n");
+ break;
+ default:
+ ERROR("error updating db\n");
+ }
}
+ update_exited = 0;
+ directory_updatePid = 0;
}
int updateInit(List * pathList)
@@ -162,8 +160,14 @@ int updateInit(List * pathList)
if (directory_updatePid > 0)
return 0;
- /* need to block CHLD signal, cause it can exit before we
- even get a chance to assign directory_updatePID */
+ /*
+ * need to block CHLD signal, cause it can exit before we
+ * even get a chance to assign directory_updatePID
+ *
+ * Update: our signal blocking is is utterly broken by
+ * pthreads(); goal will be to remove dependency on signals;
+ * but for now use the my_usleep hack below.
+ */
blockSignals();
directory_updatePid = fork();
if (directory_updatePid == 0) {
@@ -178,6 +182,13 @@ int updateInit(List * pathList)
finishPlaylist();
finishVolume();
+ /*
+ * XXX HACK to workaround race condition where
+ * directory_updatePid is still zero in the parent even upon
+ * entry of directory_sigChldHandler.
+ */
+ my_usleep(100000);
+
if (pathList) {
ListNode *node = pathList->firstNode;