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info: Fix deadlock in gst_ring_buffer_logger_log

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gst_ring_buffer_logger_log calls several functions while formatting
the message which may in turn log a message while we already hold
the mutex. Do all formatting first before acquiring the mutex to
avoid this and reduce the time we hold the mutex.
This commit is contained in:
Doug Nazar 2019-07-30 21:40:47 -04:00 committed by Sebastian Dröge
parent e4cba8a0bf
commit 7b596ba6c6
1 changed files with 37 additions and 36 deletions
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73
gst/gstinfo.c
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@ -3000,9 +3000,44 @@ gst_ring_buffer_logger_log (GstDebugCategory * category,
gint64 now = g_get_monotonic_time ();
const gchar *message_str = gst_debug_message_get (message);
/* __FILE__ might be a file name or an absolute path or a
* relative path, irrespective of the exact compiler used,
* in which case we want to shorten it to the filename for
* readability. */
c = file[0];
if (c == '.' || c == '/' || c == '\\' || (c != '\0' && file[1] == ':')) {
file = gst_path_basename (file);
}
if (object) {
obj = gst_debug_print_object (object);
} else {
obj = (gchar *) "";
}
elapsed = GST_CLOCK_DIFF (_priv_gst_start_time, gst_util_get_timestamp ());
pid = getpid ();
thread = g_thread_self ();
/* no color, all platforms */
#define PRINT_FMT " "PID_FMT" "PTR_FMT" %s "CAT_FMT" %s\n"
output =
g_strdup_printf ("%" GST_TIME_FORMAT PRINT_FMT, GST_TIME_ARGS (elapsed),
pid, thread, gst_debug_level_get_name (level),
gst_debug_category_get_name (category), file, line, function, obj,
message_str);
#undef PRINT_FMT
output_len = strlen (output);
if (object != NULL)
g_free (obj);
G_LOCK (ring_buffer_logger);
if (logger->thread_timeout > 0) {
gchar *buf;
/* Remove all threads that saw no output since thread_timeout seconds.
* By construction these are all at the tail of the queue, and the queue
* is ordered by last use, so we just need to look at the tail.
@ -3013,8 +3048,8 @@ gst_ring_buffer_logger_log (GstDebugCategory * category,
break;
g_hash_table_remove (logger->thread_index, log->thread);
while ((output = g_queue_pop_head (&log->log)))
g_free (output);
while ((buf = g_queue_pop_head (&log->log)))
g_free (buf);
g_free (log);
g_queue_pop_tail (&logger->threads);
}
@ -3022,7 +3057,6 @@ gst_ring_buffer_logger_log (GstDebugCategory * category,
/* Get logger for this thread, and put it back at the
* head of the threads queue */
thread = g_thread_self ();
log = g_hash_table_lookup (logger->thread_index, thread);
if (!log) {
log = g_new0 (GstRingBufferLog, 1);
@ -3038,36 +3072,6 @@ gst_ring_buffer_logger_log (GstDebugCategory * category,
}
log->last_use = now;
/* __FILE__ might be a file name or an absolute path or a
* relative path, irrespective of the exact compiler used,
* in which case we want to shorten it to the filename for
* readability. */
c = file[0];
if (c == '.' || c == '/' || c == '\\' || (c != '\0' && file[1] == ':')) {
file = gst_path_basename (file);
}
pid = getpid ();
if (object) {
obj = gst_debug_print_object (object);
} else {
obj = (gchar *) "";
}
elapsed = GST_CLOCK_DIFF (_priv_gst_start_time, gst_util_get_timestamp ());
/* no color, all platforms */
#define PRINT_FMT " "PID_FMT" "PTR_FMT" %s "CAT_FMT" %s\n"
output =
g_strdup_printf ("%" GST_TIME_FORMAT PRINT_FMT, GST_TIME_ARGS (elapsed),
pid, thread, gst_debug_level_get_name (level),
gst_debug_category_get_name (category), file, line, function, obj,
message_str);
#undef PRINT_FMT
output_len = strlen (output);
if (output_len < logger->max_size_per_thread) {
gchar *buf;
@ -3098,9 +3102,6 @@ gst_ring_buffer_logger_log (GstDebugCategory * category,
log->log_size = 0;
}
if (object != NULL)
g_free (obj);
G_UNLOCK (ring_buffer_logger);
}