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//============================================================
//
//  sdlos_*.c - OS specific low level code
//
//  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
//
//============================================================

#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <signal.h>

#include <mach/mach.h>
#include <mach/mach_time.h>
#include <mach/mach_traps.h>
#include <Carbon/Carbon.h>

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

// FIXME: We shouldn't use SDL functions in here

#include "sdlinc.h"

//============================================================
//  osd_getenv
//============================================================

const char *osd_getenv(const char *name)
{
    return getenv(name);
}

//============================================================
//  osd_setenv
//============================================================

int osd_setenv(const char *name, const char *value, int overwrite)
{
    return setenv(name, value, overwrite);
}

//============================================================
//  osd_process_kill
//============================================================

void osd_process_kill(void)
{
    kill(getpid(), SIGKILL);
}

//============================================================
//  osd_num_processors
//============================================================

int osd_get_num_processors(void)
{
    int processors = 1;

    struct host_basic_info host_basic_info;
    unsigned int count;
    kern_return_t r;
    mach_port_t my_mach_host_self;

    count = HOST_BASIC_INFO_COUNT;
    my_mach_host_self = mach_host_self();
    if ( ( r = host_info(my_mach_host_self, HOST_BASIC_INFO, (host_info_t)(&host_basic_info), &count)) == KERN_SUCCESS )
    {
        processors = host_basic_info.avail_cpus;
    }
    mach_port_deallocate(mach_task_self(), my_mach_host_self);

    return processors;
}

//============================================================
//  osd_malloc
//============================================================

void *osd_malloc(size_t size)
{
#ifndef MALLOC_DEBUG
    return malloc(size);
#else
#error "MALLOC_DEBUG not yet supported"
#endif
}


//============================================================
//  osd_malloc_array
//============================================================

void *osd_malloc_array(size_t size)
{
#ifndef MALLOC_DEBUG
    return malloc(size);
#else
#error "MALLOC_DEBUG not yet supported"
#endif
}


//============================================================
//  osd_free
//============================================================

void osd_free(void *ptr)
{
#ifndef MALLOC_DEBUG
    free(ptr);
#else
#error "MALLOC_DEBUG not yet supported"
#endif
}


//============================================================
//  osd_alloc_executable
//
//  allocates "size" bytes of executable memory.  this must take
//  things like NX support into account.
//============================================================

void *osd_alloc_executable(size_t size)
{
#if defined(SDLMAME_BSD) || defined(SDLMAME_MACOSX)
    return (void *)mmap(0, size, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED, -1, 0);
#elif defined(SDLMAME_UNIX)
    return (void *)mmap(0, size, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED, 0, 0);
#endif
}

//============================================================
//  osd_free_executable
//
//  frees memory allocated with osd_alloc_executable
//============================================================

void osd_free_executable(void *ptr, size_t size)
{
#ifdef SDLMAME_SOLARIS
    munmap((char *)ptr, size);
#else
    munmap(ptr, size);
#endif
}

//============================================================
//  osd_break_into_debugger
//============================================================

void osd_break_into_debugger(const char *message)
{
    #ifdef MAME_DEBUG
    printf("MAME exception: %s\n", message);
    printf("Attempting to fall into debugger\n");
    kill(getpid(), SIGTRAP);
    #else
    printf("Ignoring MAME exception: %s\n", message);
    #endif
}


//============================================================
//  PROTOTYPES
//============================================================

static osd_ticks_t init_cycle_counter(void);
static osd_ticks_t mach_cycle_counter(void);

//============================================================
//  STATIC VARIABLES
//============================================================

static osd_ticks_t      (*cycle_counter)(void) = init_cycle_counter;
static osd_ticks_t      (*ticks_counter)(void) = init_cycle_counter;
static osd_ticks_t      ticks_per_second;

//============================================================
//  init_cycle_counter
//
//  to avoid total grossness, this function is split by subarch
//============================================================

static osd_ticks_t init_cycle_counter(void)
{
    osd_ticks_t start, end;
    osd_ticks_t a, b;

    cycle_counter = mach_cycle_counter;
    ticks_counter = mach_cycle_counter;

    // wait for an edge on the timeGetTime call
    a = SDL_GetTicks();
    do
    {
        b = SDL_GetTicks();
    } while (a == b);

    // get the starting cycle count
    start = (*cycle_counter)();

    // now wait for 1/4 second total
    do
    {
        a = SDL_GetTicks();
    } while (a - b < 250);

    // get the ending cycle count
    end = (*cycle_counter)();

    // compute ticks_per_sec
    ticks_per_second = (end - start) * 4;

    // return the current cycle count
    return (*cycle_counter)();
}

//============================================================
//  performance_cycle_counter
//============================================================

//============================================================
//  mach_cycle_counter
//============================================================
static osd_ticks_t mach_cycle_counter(void)
{
    return mach_absolute_time();
}

//============================================================
//   osd_ticks
//============================================================

osd_ticks_t osd_ticks(void)
{
    return (*cycle_counter)();
}


//============================================================
//  osd_ticks_per_second
//============================================================

osd_ticks_t osd_ticks_per_second(void)
{
    if (ticks_per_second == 0)
    {
        // if we haven't computed the value yet, there's no time like the present
        init_cycle_counter();
    }
    return ticks_per_second;
}



//============================================================
//  osd_sleep
//============================================================

void osd_sleep(osd_ticks_t duration)
{
    UINT32 msec;

    // make sure we've computed ticks_per_second
    if (ticks_per_second == 0)
        (void)osd_ticks();

    // convert to milliseconds, rounding down
    msec = (UINT32)(duration * 1000 / ticks_per_second);

    // only sleep if at least 2 full milliseconds
    if (msec >= 2)
    {
        // take a couple of msecs off the top for good measure
        msec -= 2;
        usleep(msec*1000);
    }
}