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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
//
//============================================================
// standard sdl header
#include <SDL/SDL.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <signal.h>
#include <unistd.h>
#include <mach/mach.h>
#include <mach/mach_time.h>
// MAME headers
#include "osdcore.h"
//============================================================
// 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_cycles
//============================================================
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)
{
return 1; // this isn't correct, but it prevents the crash
}
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);
}
}
//============================================================
// osd_num_processors
//============================================================
int osd_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_alloc_executable
//
// allocates "size" bytes of executable memory. this must take
// things like NX support into account.
//============================================================
void *osd_alloc_executable(size_t size)
{
return (void *)mmap(0, size, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED, -1, 0);
}
//============================================================
// osd_free_executable
//
// frees memory allocated with osd_alloc_executable
//============================================================
void osd_free_executable(void *ptr, size_t size)
{
munmap(ptr, size);
}
//============================================================
// 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
}
//============================================================
// osd_malloc
//============================================================
void *osd_malloc(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
}
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