libtf: initial commit

libtf is to be user-space cooperative threading library similar
to State Threads (http://state-threads.sourceforge.net/), but
with additional support for multiple cores, using better
algorithms and taking advantage of new Linux kernel syscalls
such as eventfd, signalfd and epoll (edge-triggered mode).

Initial implementation has setjmp based user-space context
switching and trivial testcase. Works on Linux/x86.

TFbuild uses ideas from different build systems, namely Kbuild,
but it's inner workings are quite different. All build files are
included (using macro trickery) instead of recursive making. Thus
the build dependency graph is complete and should yield good make
performance. Also parallel stuff should work.

1 files changed, 52 insertions, 0 deletions

diff --git a/include/libtf/fiber.h b/include/libtf/fiber.h
new file mode 100644
index 0000000..48d4924
--- /dev/null
+++ b/include/libtf/fiber.h
@@ -0,0 +1,52 @@
+/* tf.h - libtf main include
+ *
+ * Copyright (C) 2009 Timo Teräs <timo.teras@iki.fi>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 or later as
+ * published by the Free Software Foundation.
+ *
+ * See http://www.gnu.org/ for details.
+ */
+
+#ifndef TF_FIBER_H
+#define TF_FIBER_H
+
+#include <errno.h>
+#include <libtf/defines.h>
+#include <libtf/atomic.h>
+#include <libtf/list.h>
+
+#ifndef TF_STACK_SIZE
+#define TF_STACK_SIZE		4096
+#endif
+
+struct tf_fiber {
+	unsigned int		ref_count;
+	struct tf_list_node	queue_node;
+	char			data[TF_EMPTY_ARRAY];
+};
+
+typedef void (*tf_fiber_proc)(void *fiber);
+
+int tf_main(tf_fiber_proc fiber_main);
+
+void *tf_fiber_create(tf_fiber_proc fiber_main, int private_size);
+void *tf_fiber_get(void *data);
+void tf_fiber_put(void *data);
+
+int tf_schedule(int err);
+void tf_kill(void *fiber);
+
+static inline int tf_yield(void)
+{
+	return tf_schedule(EAGAIN);
+}
+
+static inline int tf_exit(void)
+{
+	return tf_schedule(EFAULT);
+}
+
+#endif