/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Rubber Band Library
    An audio time-stretching and pitch-shifting library.
    Copyright 2007-2012 Particular Programs Ltd.

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.

    Alternatively, if you have a valid commercial licence for the
    Rubber Band Library obtained by agreement with the copyright
    holders, you may redistribute and/or modify it under the terms
    described in that licence.

    If you wish to distribute code using the Rubber Band Library
    under terms other than those of the GNU General Public License,
    you must obtain a valid commercial licence before doing so.
*/

#ifndef _RUBBERBAND_SYSUTILS_H_
#define _RUBBERBAND_SYSUTILS_H_

#ifdef __MSVC__
#include "float_cast/float_cast.h"
#define R__ __restrict
#endif

#ifdef __GNUC__
#define R__ __restrict__
#endif

#ifndef R__
#define R__
#endif

#ifdef __MINGW32__
#include <malloc.h>
#else
#ifndef __MSVC__
#include <alloca.h>
#endif
#endif

#ifdef __MSVC__
#include <malloc.h>
#include <process.h>
#define alloca _alloca
#define getpid _getpid
#endif

#ifdef __MSVC__
#define uint8_t unsigned __int8
#define uint16_t unsigned __int16
#define uint32_t unsigned __int32
#define ssize_t long
#else
#include <stdint.h>
#endif

#include <math.h>

namespace RubberBand {

extern const char *system_get_platform_tag();
extern bool system_is_multiprocessor();
extern void system_specific_initialise();
extern void system_specific_application_initialise();

enum ProcessStatus { ProcessRunning, ProcessNotRunning, UnknownProcessStatus };
extern ProcessStatus system_get_process_status(int pid);

#ifdef __APPLE__
struct timespec { long tv_sec; long tv_nsec; };
void clock_gettime(int clk_id, struct timespec *p);
#define CLOCK_MONOTONIC 1
#define CLOCK_REALTIME 2
#endif

#ifdef _WIN32

struct timeval { long tv_sec; long tv_usec; };
void gettimeofday(struct timeval *p, void *tz);

struct timespec { long tv_sec; long tv_nsec; };
// always uses GetPerformanceCounter, does not check whether it's valid or not:
void clock_gettime(int clk_id, struct timespec *p);
#define CLOCK_MONOTONIC 1
#define CLOCK_REALTIME 2

#endif

#ifdef __MSVC__

void usleep(unsigned long);

#endif

inline double mod(double x, double y) { return x - (y * floor(x / y)); }
inline float modf(float x, float y) { return x - (y * float(floor(x / y))); }

#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif

inline double princarg(double a) { return mod(a + M_PI, -2.0 * M_PI) + M_PI; }
inline float princargf(float a) { return modf(a + (float)M_PI, -2.f * (float)M_PI) + (float)M_PI; }

} // end namespace

// The following should be functions in the RubberBand namespace, really

#ifdef _WIN32

#define MLOCK(a,b)   1
#define MUNLOCK(a,b) 1
#define MUNLOCK_SAMPLEBLOCK(a) 1

namespace RubberBand {
extern void system_memorybarrier();
}
#define MBARRIER() RubberBand::system_memorybarrier()

#define DLOPEN(a,b)  LoadLibrary((a).toStdWString().c_str())
#define DLSYM(a,b)   GetProcAddress((HINSTANCE)(a),(b))
#define DLCLOSE(a)   FreeLibrary((HINSTANCE)(a))
#define DLERROR()    ""

#else

#include <sys/mman.h>
#include <dlfcn.h>
#include <stdio.h>

#define MLOCK(a,b)   ::mlock((char *)(a),(b))
#define MUNLOCK(a,b) (::munlock((char *)(a),(b)) ? (::perror("munlock failed"), 0) : 0)
#define MUNLOCK_SAMPLEBLOCK(a) do { if (!(a).empty()) { const float &b = *(a).begin(); MUNLOCK(&b, (a).capacity() * sizeof(float)); } } while(0);

#ifdef __APPLE__
#include <libkern/OSAtomic.h>
#define MBARRIER() OSMemoryBarrier()
#else
#if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
#define MBARRIER() __sync_synchronize()
#else
namespace RubberBand {
extern void system_memorybarrier();
}
#define MBARRIER() ::RubberBand::system_memorybarrier()
#endif
#endif

#define DLOPEN(a,b)  dlopen((a).toStdString().c_str(),(b))
#define DLSYM(a,b)   dlsym((a),(b))
#define DLCLOSE(a)   dlclose((a))
#define DLERROR()    dlerror()

#endif

#ifdef NO_THREADING
#undef MBARRIER
#define MBARRIER() 
#endif

#endif
