From bd489eb73ac0c401864888fe1bfb29a88cd10717 Mon Sep 17 00:00:00 2001
From: Jonas 'Sortie' Termansen <sortie@maxsi.org>
Date: Fri, 4 May 2012 13:13:44 +0200
Subject: [PATCH] Forward compatbility with the kthread branch.

---
 sortix/Makefile                        |  1 +
 sortix/include/sortix/kernel/kthread.h | 66 ++++++++++++++++++++++++++
 sortix/kthread.cpp                     | 58 ++++++++++++++++++++++
 3 files changed, 125 insertions(+)
 create mode 100644 sortix/include/sortix/kernel/kthread.h
 create mode 100644 sortix/kthread.cpp

diff --git a/sortix/Makefile b/sortix/Makefile
index ba217d87..fd0ba87f 100644
--- a/sortix/Makefile
+++ b/sortix/Makefile
@@ -94,6 +94,7 @@ log.o \
 utf8.o \
 calltrace.o \
 $(CPU)/calltrace.o \
+kthread.o \
 panic.o \
 keyboard.o \
 kb/ps2.o \
diff --git a/sortix/include/sortix/kernel/kthread.h b/sortix/include/sortix/kernel/kthread.h
new file mode 100644
index 00000000..c73d0288
--- /dev/null
+++ b/sortix/include/sortix/kernel/kthread.h
@@ -0,0 +1,66 @@
+/*******************************************************************************
+
+	COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2012.
+
+	This file is part of Sortix.
+
+	Sortix 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.
+
+	Sortix 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
+	Sortix. If not, see <http://www.gnu.org/licenses/>.
+
+	kthread.h
+	Fake header providing noop threading functions. This is simply forward
+	compatibility with the upcoming kthread branch and to ease merging.
+
+*******************************************************************************/
+
+#ifndef SORTIX_KTHREAD_H
+#define SORTIX_KTHREAD_H
+
+#warning Using noop kthread functions
+
+namespace Sortix {
+
+typedef unsigned kthread_mutex_t;
+const kthread_mutex_t KTHREAD_MUTEX_INITIALIZER = 0;
+extern "C" unsigned kthread_mutex_trylock(kthread_mutex_t* mutex);
+extern "C" void kthread_mutex_lock(kthread_mutex_t* mutex);
+extern "C" void kthread_mutex_unlock(kthread_mutex_t* mutex);
+typedef unsigned kthread_cond_t;
+const kthread_cond_t KTHREAD_COND_INITIALIZER = 0;
+extern "C" void kthread_cond_wait(kthread_cond_t* cond, kthread_mutex_t* mutex);
+extern "C" void kthread_cond_signal(kthread_cond_t* cond);
+extern "C" void kthread_cond_broadcast(kthread_cond_t* cond);
+
+class ScopedLock
+{
+public:
+	ScopedLock(kthread_mutex_t* mutex)
+	{
+		this->mutex = mutex;
+		kthread_mutex_lock(mutex);
+	}
+
+	~ScopedLock()
+	{
+		kthread_mutex_unlock(mutex);
+	}
+
+private:
+	kthread_mutex_t* mutex;
+
+};
+
+} // namespace Sortix
+
+#endif
+
diff --git a/sortix/kthread.cpp b/sortix/kthread.cpp
new file mode 100644
index 00000000..d10e279d
--- /dev/null
+++ b/sortix/kthread.cpp
@@ -0,0 +1,58 @@
+/*******************************************************************************
+
+	COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2012.
+
+	This file is part of Sortix.
+
+	Sortix 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.
+
+	Sortix 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
+	Sortix. If not, see <http://www.gnu.org/licenses/>.
+
+	kthread.cpp
+	Fake header providing noop threading functions. This is simply forward
+	compatibility with the upcoming kthread branch and to ease merging.
+
+*******************************************************************************/
+
+#include <sortix/kernel/platform.h>
+#include <sortix/kernel/kthread.h>
+
+namespace Sortix {
+
+// This isn't as bad as it looks. Kernel code traditionally runs with interrupts
+// disabled so there are no race conditions.
+
+extern "C" unsigned kthread_mutex_trylock(kthread_mutex_t* mutex)
+{
+}
+
+extern "C" void kthread_mutex_lock(kthread_mutex_t* mutex)
+{
+}
+
+extern "C" void kthread_mutex_unlock(kthread_mutex_t* mutex)
+{
+}
+
+extern "C" void kthread_cond_wait(kthread_cond_t* cond, kthread_mutex_t* mutex)
+{
+}
+
+extern "C" void kthread_cond_signal(kthread_cond_t* cond)
+{
+}
+
+extern "C" void kthread_cond_broadcast(kthread_cond_t* cond)
+{
+}
+
+} // namespace Sortix