//============================================================
//
//  sdlsync.c - SDL core synchronization functions
//
//  Copyright (c) 1996-2010, Nicola Salmoria and the MAME Team.
//  Visit http://mamedev.org for licensing and usage restrictions.
//
//  SDLMAME by Olivier Galibert and R. Belmont
//
//============================================================

#ifndef _GNU_SOURCE
#define _GNU_SOURCE 	// for PTHREAD_MUTEX_RECURSIVE; needs to be here before other glibc headers are included
#endif

#include "SDL/SDL.h"

#ifdef SDLMAME_MACOSX
#include <mach/mach.h>
#endif

// standard C headers
#include <math.h>
#include <unistd.h>

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

#include "sdlsync.h"

#include <pthread.h>
#include <errno.h>
#include <sys/time.h>

typedef struct _hidden_mutex_t hidden_mutex_t;
struct _hidden_mutex_t {
	pthread_mutex_t id;
};

struct _osd_event {
	pthread_mutex_t 	mutex;
	pthread_cond_t		cond;
	volatile INT32		autoreset;
	volatile INT32		signalled;
#ifdef PTR64
	INT8				padding[40];	// Fill a 64-byte cache line
#else
	INT8				padding[48];	// A bit more padding
#endif
};

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

struct _osd_thread {
	pthread_t			thread;
};

struct _osd_scalable_lock
{
	osd_lock			*lock;
};

//============================================================
//  Scalable Locks
//============================================================

osd_scalable_lock *osd_scalable_lock_alloc(void)
{
	osd_scalable_lock *lock;

	lock = (osd_scalable_lock *)calloc(1, sizeof(*lock));

	lock->lock = osd_lock_alloc();
	return lock;
}


INT32 osd_scalable_lock_acquire(osd_scalable_lock *lock)
{
	osd_lock_acquire(lock->lock);
	return 0;
}


void osd_scalable_lock_release(osd_scalable_lock *lock, INT32 myslot)
{
	osd_lock_release(lock->lock);
}

void osd_scalable_lock_free(osd_scalable_lock *lock)
{
	osd_lock_free(lock->lock);
	free(lock);
}


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

osd_lock *osd_lock_alloc(void)
{
	hidden_mutex_t *mutex;
	pthread_mutexattr_t mtxattr;

	mutex = (hidden_mutex_t *)calloc(1, sizeof(hidden_mutex_t));

	pthread_mutexattr_init(&mtxattr);
	pthread_mutexattr_settype(&mtxattr, PTHREAD_MUTEX_RECURSIVE);
	pthread_mutex_init(&mutex->id, &mtxattr);

	return (osd_lock *)mutex;
}

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

void osd_lock_acquire(osd_lock *lock)
{
	hidden_mutex_t *mutex = (hidden_mutex_t *) lock;
	int r;

	r =	pthread_mutex_lock(&mutex->id);
	if (r==0)
		return;
	//mame_printf_error("Error on lock: %d: %s\n", r, strerror(r));
}

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

int osd_lock_try(osd_lock *lock)
{
	hidden_mutex_t *mutex = (hidden_mutex_t *) lock;
	int r;

	r = pthread_mutex_trylock(&mutex->id);
	if (r==0)
		return 1;
	//if (r!=EBUSY)
    //  mame_printf_error("Error on trylock: %d: %s\n", r, strerror(r));
	return 0;
}

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

void osd_lock_release(osd_lock *lock)
{
	hidden_mutex_t *mutex = (hidden_mutex_t *) lock;

	pthread_mutex_unlock(&mutex->id);
}

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

void osd_lock_free(osd_lock *lock)
{
	hidden_mutex_t *mutex = (hidden_mutex_t *) lock;

	pthread_mutex_unlock(&mutex->id);
	pthread_mutex_destroy(&mutex->id);
	free(mutex);
}

//============================================================
//  osd_event_alloc
//============================================================

osd_event *osd_event_alloc(int manualreset, int initialstate)
{
	osd_event *ev;
	pthread_mutexattr_t mtxattr;

	ev = (osd_event *)calloc(1, sizeof(osd_event));

	pthread_mutexattr_init(&mtxattr);
	pthread_mutex_init(&ev->mutex, &mtxattr);
	pthread_cond_init(&ev->cond, NULL);
	ev->signalled = initialstate;
	ev->autoreset = !manualreset;

	return ev;
}

//============================================================
//  osd_event_free
//============================================================

void osd_event_free(osd_event *event)
{
	pthread_mutex_destroy(&event->mutex);
	pthread_cond_destroy(&event->cond);
	free(event);
}

//============================================================
//  osd_event_set
//============================================================

void osd_event_set(osd_event *event)
{
	pthread_mutex_lock(&event->mutex);
	if (event->signalled == FALSE)
	{
		event->signalled = TRUE;
		if (event->autoreset)
			pthread_cond_signal(&event->cond);
		else
			pthread_cond_broadcast(&event->cond);
	}
	pthread_mutex_unlock(&event->mutex);
}

//============================================================
//  osd_event_reset
//============================================================

void osd_event_reset(osd_event *event)
{
	pthread_mutex_lock(&event->mutex);
	event->signalled = FALSE;
	pthread_mutex_unlock(&event->mutex);
}

//============================================================
//  osd_event_wait
//============================================================

int osd_event_wait(osd_event *event, osd_ticks_t timeout)
{
	pthread_mutex_lock(&event->mutex);
	if (!timeout)
	{
		if (!event->signalled)
		{
				pthread_mutex_unlock(&event->mutex);
				return FALSE;
		}
	}
	else
	{
		if (!event->signalled)
		{
			struct timespec   ts;
			struct timeval    tp;
			UINT64 msec = timeout * 1000 / osd_ticks_per_second();
			UINT64 nsec;

			gettimeofday(&tp, NULL);

			ts.tv_sec  = tp.tv_sec;
			nsec = (UINT64) tp.tv_usec * (UINT64) 1000 + (msec * (UINT64) 1000000);
			ts.tv_nsec = nsec % (UINT64) 1000000000;
			ts.tv_sec += nsec / (UINT64) 1000000000;

			do {
				int ret = pthread_cond_timedwait(&event->cond, &event->mutex, &ts);
				if ( ret == ETIMEDOUT )
				{
					if (!event->signalled)
					{
						pthread_mutex_unlock(&event->mutex);
						return FALSE;
					}
					else
						break;
				}
				if (ret == 0)
					break;
				if ( ret != EINTR)
				{
					printf("Error %d while waiting for pthread_cond_timedwait:  %s\n", ret, strerror(ret));
				}

			} while (TRUE);
		}
	}

	if (event->autoreset)
		event->signalled = 0;

	pthread_mutex_unlock(&event->mutex);

	return TRUE;
}

//============================================================
//  osd_thread_create
//============================================================

osd_thread *osd_thread_create(osd_thread_callback callback, void *cbparam)
{
	osd_thread *thread;
	pthread_attr_t	attr;

	thread = (osd_thread *)calloc(1, sizeof(osd_thread));
	pthread_attr_init(&attr);
	pthread_attr_setinheritsched(&attr, PTHREAD_INHERIT_SCHED);
	if ( pthread_create(&thread->thread, &attr, callback, cbparam) != 0 )
	{
		free(thread);
		return NULL;
	}
	return thread;
}

//============================================================
//  osd_thread_adjust_priority
//============================================================

int osd_thread_adjust_priority(osd_thread *thread, int adjust)
{
	struct sched_param	sched;
	int					policy;

	if ( pthread_getschedparam( thread->thread, &policy, &sched ) == 0 )
	{
		sched.sched_priority += adjust;
		if ( pthread_setschedparam(thread->thread, policy, &sched ) == 0)
			return TRUE;
		else
			return FALSE;
	}
	else
		return FALSE;
}

//============================================================
//  osd_thread_cpu_affinity
//============================================================

int osd_thread_cpu_affinity(osd_thread *thread, UINT32 mask)
{
#if !defined(NO_AFFINITY_NP)
	cpu_set_t	cmask;
	pthread_t	lthread;
	int			bitnum;

	CPU_ZERO(&cmask);
	for (bitnum=0; bitnum<32; bitnum++)
		if (mask & (1<<bitnum))
			CPU_SET(bitnum, &cmask);

	if (thread == NULL)
		lthread = pthread_self();
	else
		lthread = thread->thread;

	if (pthread_setaffinity_np(lthread, sizeof(cmask), &cmask) <0)
	{
		/* Not available during link in all targets */
		fprintf(stderr, "error %d setting cpu affinity to mask %08x", errno, mask);
		return FALSE;
	}
	else
		return TRUE;
#else
	return TRUE;
#endif
}

//============================================================
//  osd_thread_wait_free
//============================================================

void osd_thread_wait_free(osd_thread *thread)
{
	pthread_join(thread->thread, NULL);
	free(thread);
}

