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+/***************************************************************************
+
+ cothread.h
+
+ Class wrapper around byuu's cothread library.
+
+****************************************************************************
+
+ Copyright Aaron Giles
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are
+ met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+ * Neither the name 'MAME' nor the names of its contributors may be
+ used to endorse or promote products derived from this software
+ without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR
+ IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT,
+ INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ POSSIBILITY OF SUCH DAMAGE.
+
+***************************************************************************/
+
+#pragma once
+
+#ifndef __EMU_H__
+#error Dont include this file directly; include emu.h instead.
+#endif
+
+#ifndef __COTHREAD_H__
+#define __COTHREAD_H__
+
+#include "cothread/libco.h"
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// delegate that points to a thread's entry
+typedef delegate<void ()> cothread_entry_delegate;
+
+
+// ======================> cothread
+
+class cothread
+{
+public:
+ // construction/destruction
+ cothread(cothread_t existing_thread);
+ cothread(cothread_entry_delegate entry, size_t stack = 1048576);
+ ~cothread() { if (m_creator_cothread != NULL) co_delete(m_cothread); }
+
+ // switching
+ void make_active() { co_switch(m_cothread); }
+
+private:
+ // internal helpers
+ static void cothread_entry();
+
+ // internal state
+ cothread_t m_cothread;
+ cothread_t m_creator_cothread;
+ cothread_entry_delegate m_entry;
+
+ // static state
+ static osd_lock * s_create_lock;
+ static cothread * s_create_cothread;
+};
+
+
+#endif // __COTHREAD_H__