From 121599dc897e7a31fca1ff2973c9a431c57567a2 Mon Sep 17 00:00:00 2001
From: Christian Thaeter <ct@pipapo.org>
Date: Tue, 23 Dec 2008 08:44:30 +0100
Subject: [PATCH] lowest level thread api proposal

---
 src/backend/threads.c |  52 +++++++++++++++++++++
 src/backend/threads.h | 102 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 154 insertions(+)
 create mode 100644 src/backend/threads.c
 create mode 100644 src/backend/threads.h

diff --git a/src/backend/threads.c b/src/backend/threads.c
new file mode 100644
index 000000000..9c051fc13
--- /dev/null
+++ b/src/backend/threads.c
@@ -0,0 +1,52 @@
+/*
+  threads.c  -  Manage threads
+
+  Copyright (C)         Lumiera.org
+    2008,               Christian Thaeter <ct@pipapo.org>
+
+  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 2 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, write to the Free Software
+  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+//TODO: Support library includes//
+
+
+//TODO: Lumiera header includes//
+#include "backend/threads.h"
+
+//TODO: internal/static forward declarations//
+
+
+//TODO: System includes//
+
+
+/**
+ * @file
+ *
+ */
+
+NOBUG_DEFINE_FLAG_PARENT (threads, /*TODO insert parent flag here */);
+
+
+//code goes here//
+
+
+
+/*
+// Local Variables:
+// mode: C
+// c-file-style: "gnu"
+// indent-tabs-mode: nil
+// End:
+*/
diff --git a/src/backend/threads.h b/src/backend/threads.h
new file mode 100644
index 000000000..38c0e12f7
--- /dev/null
+++ b/src/backend/threads.h
@@ -0,0 +1,102 @@
+/*
+  threads.h  -  Manage threads
+
+  Copyright (C)         Lumiera.org
+    2008,               Christian Thaeter <ct@pipapo.org>
+
+  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 2 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, write to the Free Software
+  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#ifndef LUMIERA_THREADS_H
+#define LUMIERA_THREADS_H
+
+//TODO: Support library includes//
+
+
+//TODO: Forward declarations//
+
+
+//TODO: Lumiera header includes//
+
+
+//TODO: System includes//
+#include <nobug.h>
+
+
+/**
+ * @file
+ *
+ */
+
+//TODO: declarations go here//
+
+typedef struct lumiera_thread_struct lumiera_thread;
+typedef lumiera_thread* LumieraThread;
+
+/**
+ * Thread classes.
+ * We define some 'classes' of threads for different purposes to abstract
+ * priorities and other attributes.
+ */
+enum lumiera_thread_class
+  {
+    /** mostly idle, low latency **/
+    LUMIERA_THREAD_INTERACTIVE,
+    /** busy at average priority **/
+    LUMIERA_THREAD_WORKER,
+    /** busy, soft realtime, high priority **/
+    LUMIERA_THREAD_URGEND,
+    /** high latency, background jobs **/
+    LUMIERA_THREAD_BATCH,
+    /** Something to do when there is really nothing else to do **/
+    LUMIERA_THREAD_IDLE,
+  };
+
+/**
+ * Start a thread.
+ * Threads are implemented as procedures which take a void* and dont return anything.
+ * When a thread wants to pass something back to the application it should use the void* it got for
+ * constructing the return.
+ *  * Threads must complete (return from their thread function)
+ *  * They must not call any exit() function.
+ *  * Threads are not cancelable
+ *  * Threads shall not handle signals (all signals will be disabled for them) unless explicitly acknowledged
+ *
+ * @param kind class of the thread to start
+ * @param start_routine pointer to a function to execute in a thread (returning void, not void* as in pthreads)
+ * @param arg generic pointer passed to the thread
+ * @param finished a condition variable to be broadcasted, if not NULL.
+ *        The associated mutex should be locked at thread_run time already, else the signal can get lost.
+ * @param purpose descriptive name of this thread, used by NoBug
+ * @param flag NoBug flag used for logging the thread startup and return
+ */
+LumieraThread
+lumiera_thread_run (enum lumiera_thread_class kind,
+                    void (*start_routine)(void *),
+                    void * arg,
+                    LumieraCondition finished,
+                    const char* purpose,
+                    struct nobug_flag* flag);
+
+
+
+#endif
+/*
+// Local Variables:
+// mode: C
+// c-file-style: "gnu"
+// indent-tabs-mode: nil
+// End:
+*/