manager: Move threading functions to utils

src/utils/gcal-thread-utils.c

@@ -0,0 +1,101 @@
+/* gcal-thread-utils.c
+ *
+ * Copyright 2019 Georges Basile Stavracas Neto <georges.stavracas@gmail.com>
+ *
+ * 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 Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "gcal-thread-utils.h"
+
+/* Code kindly provided by Milan Crha */
+
+typedef struct {
+  EThreadJobFunc      func;
+  gpointer            user_data;
+  GDestroyNotify      free_user_data;
+
+  GCancellable       *cancellable;
+  GError             *error;
+} ThreadJobData;
+
+static void
+thread_job_data_free (gpointer ptr)
+{
+  ThreadJobData *tjd = ptr;
+
+  if (tjd != NULL)
+    {
+      /* This should go to UI with more info/description,
+       * if it is not G_IOI_ERROR_CANCELLED */
+      if (tjd->error != NULL && !g_error_matches (tjd->error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
+        g_warning ("Job failed: %s\n", tjd->error->message);
+
+      if (tjd->free_user_data != NULL)
+        tjd->free_user_data (tjd->user_data);
+
+      g_clear_object (&tjd->cancellable);
+      g_clear_error (&tjd->error);
+      g_free (tjd);
+    }
+}
+
+static gpointer
+thread_job_thread (gpointer user_data)
+{
+  ThreadJobData *tjd = user_data;
+
+  g_return_val_if_fail (tjd != NULL, NULL);
+
+  if (tjd->func != NULL)
+    tjd->func (tjd->user_data, tjd->cancellable, &tjd->error);
+
+  thread_job_data_free (tjd);
+
+  return g_thread_self ();
+}
+
+GCancellable*
+gcal_thread_submit_job (EThreadJobFunc func,
+                        gpointer       user_data,
+                        GDestroyNotify free_user_data)
+{
+  ThreadJobData *tjd;
+  GThread *thread;
+  GCancellable *cancellable;
+
+  cancellable = g_cancellable_new ();
+
+  tjd = g_new0 (ThreadJobData, 1);
+  tjd->func = func;
+  tjd->user_data = user_data;
+  tjd->free_user_data = free_user_data;
+  /* user should be able to cancel this cancellable somehow */
+  tjd->cancellable = g_object_ref (cancellable);
+  tjd->error = NULL;
+
+  thread = g_thread_try_new (NULL, thread_job_thread, tjd, &tjd->error);
+  if (thread != NULL)
+    {
+      g_thread_unref (thread);
+    }
+  else
+    {
+      thread_job_data_free (tjd);
+      g_clear_object (&cancellable);
+    }
+
+  return cancellable;
+}

src/utils/gcal-thread-utils.h

@@ -0,0 +1,33 @@
+/* gcal-thread-utils.h
+ *
+ * Copyright 2019 Georges Basile Stavracas Neto <georges.stavracas@gmail.com>
+ *
+ * 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 Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include "e-cal-data-model.h"
+
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+GCancellable*        gcal_thread_submit_job                      (EThreadJobFunc     func,
+                                                                  gpointer           user_data,
+                                                                  GDestroyNotify     free_user_data);
+
+G_END_DECLS

src/utils/gcal-utils.h

@@ -20,6 +20,7 @@
 #define __GCAL_UTILS_H__
 
 #include "gcal-date-time-utils.h"
+#include "gcal-thread-utils.h"
 #include "gcal-manager.h"
 
 #include <gtk/gtk.h>