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pull: Close another race 

Only send _IDLE messages if and only if we state transition the main
thread (from idle -> !idle or !idle -> idle).  This ensures that we
don't send IDLE, then get it back, and process that when we're !idle.
This commit is contained in:
Colin Walters 2014-01-20 06:17:45 -05:00
parent 3cd866556c
commit 9640171711
1 changed files with 20 additions and 24 deletions
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44
src/libostree/ostree-repo-pull.c
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@ -104,6 +104,7 @@ typedef struct {
GHashTable *requested_content; /* Maps object name to itself */
guint checking_metadata_scan_complete : 1;
guint metadata_scan_complete : 1;
gboolean was_idle;
guint idle_serial;
guint n_outstanding_metadata_fetches;
guint n_outstanding_metadata_write_requests;
@ -253,24 +254,6 @@ throw_async_error (OtPullData *pull_data,
}
}
static gboolean
termination_condition (OtPullData *pull_data,
gboolean current_fetch_idle,
gboolean current_write_idle)
{
/* This is true in the phase when we're fetching refs */
if (pull_data->metadata_objects_to_scan == NULL)
{
if (!pull_data->fetching_sync_uri)
return TRUE;
}
else if (pull_data->metadata_scan_complete && current_fetch_idle && current_write_idle)
{
return TRUE;
}
return FALSE;
}
static void
check_outstanding_requests_handle_error (OtPullData *pull_data,
GError *error)
@ -279,24 +262,37 @@ check_outstanding_requests_handle_error (OtPullData *pull_data,
pull_data->n_outstanding_content_fetches == 0);
gboolean current_write_idle = (pull_data->n_outstanding_metadata_write_requests == 0 &&
pull_data->n_outstanding_content_write_requests == 0);
gboolean current_idle = current_fetch_idle && current_write_idle;
g_debug ("pull: scanning: %u fetching: %u staging: %u",
!pull_data->metadata_scan_complete, !current_fetch_idle, !current_write_idle);
throw_async_error (pull_data, error);
if (pull_data->metadata_objects_to_scan &&
!pull_data->checking_metadata_scan_complete &&
!pull_data->metadata_scan_complete &&
(current_fetch_idle && current_write_idle))
/* This is true in the phase when we're fetching refs */
if (pull_data->metadata_objects_to_scan == NULL)
{
pull_data->checking_metadata_scan_complete = TRUE;
if (!pull_data->fetching_sync_uri)
g_main_loop_quit (pull_data->loop);
return;
}
if (pull_data->was_idle && !current_idle)
{
/* We transitioned to !idle */
g_debug ("pull: No longer idle");
pull_data->idle_serial++;
pull_data->was_idle = FALSE;
}
else if (!pull_data->was_idle && current_idle)
{
pull_data->was_idle = TRUE;
g_debug ("Sending new MSG_IDLE with serial %u", pull_data->idle_serial);
ot_waitable_queue_push (pull_data->metadata_objects_to_scan,
pull_worker_message_new (PULL_MSG_IDLE, GUINT_TO_POINTER (pull_data->idle_serial)));
}
else if (termination_condition (pull_data, current_fetch_idle, current_write_idle))
if (pull_data->metadata_scan_complete && current_idle)
g_main_loop_quit (pull_data->loop);
}