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+/***************************************************************************
+
+ cothread.c
+
+ 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.
+
+***************************************************************************/
+
+#include "emu.h"
+#include "cothread/libco.h"
+
+
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+
+// static members of the cothread class
+osd_lock *cothread::s_create_lock = osd_lock_alloc();
+cothread *cothread::s_create_cothread;
+
+
+
+//**************************************************************************
+// COTHREAD
+//**************************************************************************
+
+//-------------------------------------------------
+// cothread - constructor
+//-------------------------------------------------
+
+cothread::cothread(cothread_t existing_thread)
+ : m_cothread(existing_thread),
+ m_creator_cothread(NULL)
+{
+}
+
+cothread::cothread(cothread_entry_delegate entry, size_t stack)
+ : m_cothread(NULL),
+ m_creator_cothread(co_active()),
+ m_entry(entry)
+{
+ // due to the lack of input parameter to the entry function,
+ // all cothread creation is explicitly serialized
+ osd_lock_acquire(s_create_lock);
+ s_create_cothread = this;
+ m_cothread = co_create(stack, &cothread_entry);
+ co_switch(m_cothread);
+ osd_lock_release(s_create_lock);
+}
+
+
+//-------------------------------------------------
+// cothread_entry - static entry point
+//-------------------------------------------------
+
+void cothread::cothread_entry()
+{
+ // on first call, retrieve the static pointer and return
+ cothread *thread = s_create_cothread;
+ co_switch(thread->m_creator_cothread);
+
+ // when actually swapped in later, call the entry point
+ thread->m_entry();
+}