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Diffstat (limited to 'trunk/src/emu/cothread.c')
-rw-r--r-- | trunk/src/emu/cothread.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/trunk/src/emu/cothread.c b/trunk/src/emu/cothread.c new file mode 100644 index 00000000000..4dbce1fa465 --- /dev/null +++ b/trunk/src/emu/cothread.c @@ -0,0 +1,95 @@ +/*************************************************************************** + + 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(); +} |