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//============================================================
//
//  winsync.c - Win32 OSD core synchronization functions
//
//============================================================
//
//  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
//  DAMAGE (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.
//
//============================================================

// standard windows headers
#define WIN32_LEAN_AND_MEAN
#include <windows.h>

// MAME headers
#include "osdcore.h"
#include "osinline.h"


//============================================================
//  DEBUGGING
//============================================================

#define DEBUG_SLOW_LOCKS	0



//============================================================
//  TYPE DEFINITIONS
//============================================================

typedef BOOL (WINAPI *try_enter_critical_section_ptr)(LPCRITICAL_SECTION lpCriticalSection);

struct _osd_lock
{
	CRITICAL_SECTION	critsect;
};



//============================================================
//  GLOBAL VARIABLES
//============================================================

static try_enter_critical_section_ptr try_enter_critical_section = NULL;
static int checked_for_try_enter = FALSE;



//============================================================
//  osd_lock_alloc
//============================================================

osd_lock *osd_lock_alloc(void)
{
	osd_lock *lock = (osd_lock *)malloc(sizeof(*lock));
	if (lock == NULL)
		return NULL;
	InitializeCriticalSection(&lock->critsect);
	return lock;
}


//============================================================
//  osd_lock_acquire
//============================================================

void osd_lock_acquire(osd_lock *lock)
{
#if DEBUG_SLOW_LOCKS
	osd_ticks_t ticks = osd_ticks();
#endif

	// block until we can acquire the lock
	EnterCriticalSection(&lock->critsect);

#if DEBUG_SLOW_LOCKS
	// log any locks that take more than 1ms
	ticks = osd_ticks() - ticks;
	if (ticks > osd_ticks_per_second() / 1000) mame_printf_debug("Blocked %d ticks on lock acquire\n", (int)ticks);
#endif
}


//============================================================
//  osd_lock_try
//============================================================

int osd_lock_try(osd_lock *lock)
{
	int result = TRUE;

	// if we haven't yet checked for the TryEnter API, do it now
	if (!checked_for_try_enter)
	{
		// see if we can use TryEnterCriticalSection
		HMODULE library = LoadLibrary(TEXT("kernel32.dll"));
		if (library != NULL)
			try_enter_critical_section = (try_enter_critical_section_ptr)GetProcAddress(library, "TryEnterCriticalSection");
		checked_for_try_enter = TRUE;
	}

	// if we have it, use it, otherwise just block
	if (try_enter_critical_section != NULL)
		result = (*try_enter_critical_section)(&lock->critsect);
	else
		EnterCriticalSection(&lock->critsect);
	return result;
}


//============================================================
//  osd_lock_release
//============================================================

void osd_lock_release(osd_lock *lock)
{
	LeaveCriticalSection(&lock->critsect);
}


//============================================================
//  osd_lock_free
//============================================================

void osd_lock_free(osd_lock *lock)
{
	DeleteCriticalSection(&lock->critsect);
	free(lock);
}


//============================================================
//  win_compare_exchange32
//============================================================

INT32 win_compare_exchange32(INT32 volatile *ptr, INT32 compare, INT32 exchange)
{
	return InterlockedCompareExchange((LPLONG)ptr, (LONG)exchange, (LONG)compare);
}


//============================================================
//  win_compare_exchange64
//============================================================

#ifdef PTR64
INT64 win_compare_exchange64(INT64 volatile *ptr, INT64 compare, INT64 exchange)
{
	return InterlockedCompareExchange64((LONGLONG*)ptr, (LONGLONG)exchange, (LONGLONG)compare);
}
#endif


//============================================================
//  win_atomic_exchange32
//============================================================

INT32 win_atomic_exchange32(INT32 volatile *ptr, INT32 exchange)
{
	return InterlockedExchange((LONG *) ptr, exchange);
}


//============================================================
//  win_atomic_add32
//============================================================

INT32 win_atomic_add32(INT32 volatile *ptr, INT32 delta)
{
	return InterlockedExchangeAdd((LONG *) ptr, delta) + delta;
}