/*
    Copyright 2005-2014 Intel Corporation.  All Rights Reserved.

    This file is part of Threading Building Blocks. Threading Building Blocks is free software;
    you can redistribute it and/or modify it under the terms of the GNU General Public License
    version 2  as  published  by  the  Free Software Foundation.  Threading Building Blocks is
    distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
    implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    See  the GNU General Public License for more details.   You should have received a copy of
    the  GNU General Public License along with Threading Building Blocks; if not, write to the
    Free Software Foundation, Inc.,  51 Franklin St,  Fifth Floor,  Boston,  MA 02110-1301 USA

    As a special exception,  you may use this file  as part of a free software library without
    restriction.  Specifically,  if other files instantiate templates  or use macros or inline
    functions from this file, or you compile this file and link it with other files to produce
    an executable,  this file does not by itself cause the resulting executable to be covered
    by the GNU General Public License. This exception does not however invalidate any other
    reasons why the executable file might be covered by the GNU General Public License.
*/

#ifndef __TBB_scalable_allocator_H
#define __TBB_scalable_allocator_H
/** @file */

#include <stddef.h> /* Need ptrdiff_t and size_t from here. */
#if !_MSC_VER
#include <stdint.h> /* Need intptr_t from here. */
#endif

#if !defined(__cplusplus) && __ICC==1100
    #pragma warning (push)
    #pragma warning (disable: 991)
#endif

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

#if _MSC_VER >= 1400
#define __TBB_EXPORTED_FUNC   __cdecl
#else
#define __TBB_EXPORTED_FUNC
#endif

/** The "malloc" analogue to allocate block of memory of size bytes.
  * @ingroup memory_allocation */
void * __TBB_EXPORTED_FUNC scalable_malloc (size_t size);

/** The "free" analogue to discard a previously allocated piece of memory.
    @ingroup memory_allocation */
void   __TBB_EXPORTED_FUNC scalable_free (void* ptr);

/** The "realloc" analogue complementing scalable_malloc.
    @ingroup memory_allocation */
void * __TBB_EXPORTED_FUNC scalable_realloc (void* ptr, size_t size);

/** The "calloc" analogue complementing scalable_malloc.
    @ingroup memory_allocation */
void * __TBB_EXPORTED_FUNC scalable_calloc (size_t nobj, size_t size);

/** The "posix_memalign" analogue.
    @ingroup memory_allocation */
int __TBB_EXPORTED_FUNC scalable_posix_memalign (void** memptr, size_t alignment, size_t size);

/** The "_aligned_malloc" analogue.
    @ingroup memory_allocation */
void * __TBB_EXPORTED_FUNC scalable_aligned_malloc (size_t size, size_t alignment);

/** The "_aligned_realloc" analogue.
    @ingroup memory_allocation */
void * __TBB_EXPORTED_FUNC scalable_aligned_realloc (void* ptr, size_t size, size_t alignment);

/** The "_aligned_free" analogue.
    @ingroup memory_allocation */
void __TBB_EXPORTED_FUNC scalable_aligned_free (void* ptr);

/** The analogue of _msize/malloc_size/malloc_usable_size.
    Returns the usable size of a memory block previously allocated by scalable_*,
    or 0 (zero) if ptr does not point to such a block.
    @ingroup memory_allocation */
size_t __TBB_EXPORTED_FUNC scalable_msize (void* ptr);

/* Results for scalable_allocation_* functions */
typedef enum {
    TBBMALLOC_OK,
    TBBMALLOC_INVALID_PARAM,
    TBBMALLOC_UNSUPPORTED,
    TBBMALLOC_NO_MEMORY,
    TBBMALLOC_NO_EFFECT
} ScalableAllocationResult;

/* Setting TBB_MALLOC_USE_HUGE_PAGES environment variable to 1 enables huge pages.
   scalable_allocation_mode call has priority over environment variable. */
typedef enum {
    TBBMALLOC_USE_HUGE_PAGES,  /* value turns using huge pages on and off */
    /* deprecated, kept for backward compatibility only */
    USE_HUGE_PAGES = TBBMALLOC_USE_HUGE_PAGES,
    /* try to limit memory consumption value Bytes, clean internal buffers
       if limit is exceeded, but not prevents from requesting memory from OS */
    TBBMALLOC_SET_SOFT_HEAP_LIMIT
} AllocationModeParam;

/** Set TBB allocator-specific allocation modes.
    @ingroup memory_allocation */
int __TBB_EXPORTED_FUNC scalable_allocation_mode(int param, intptr_t value);

typedef enum {
    /* Clean internal allocator buffers for all threads.
       Returns TBBMALLOC_NO_EFFECT if no buffers cleaned,
       TBBMALLOC_OK if some memory released from buffers. */
    TBBMALLOC_CLEAN_ALL_BUFFERS,
    /* Clean internal allocator buffer for current thread only.
       Return values same as for TBBMALLOC_CLEAN_ALL_BUFFERS. */
    TBBMALLOC_CLEAN_THREAD_BUFFERS
} ScalableAllocationCmd;

/** Call TBB allocator-specific commands.
    @ingroup memory_allocation */
int __TBB_EXPORTED_FUNC scalable_allocation_command(int cmd, void *param);

#ifdef __cplusplus
} /* extern "C" */
#endif /* __cplusplus */

#ifdef __cplusplus

//! The namespace rml contains components of low-level memory pool interface.
namespace rml {
class MemoryPool;

typedef void *(*rawAllocType)(intptr_t pool_id, size_t &bytes);
typedef int   (*rawFreeType)(intptr_t pool_id, void* raw_ptr, size_t raw_bytes);

/*
MemPoolPolicy extension must be compatible with such structure fields layout

struct MemPoolPolicy {
    rawAllocType pAlloc;
    rawFreeType  pFree;
    size_t       granularity;   // granularity of pAlloc allocations
};
*/

struct MemPoolPolicy {
    enum {
        TBBMALLOC_POOL_VERSION = 1
    };

    rawAllocType pAlloc;
    rawFreeType  pFree;
                 // granularity of pAlloc allocations. 0 means default used.
    size_t       granularity;
    int          version;
                 // all memory consumed at 1st pAlloc call and never returned,
                 // no more pAlloc calls after 1st
    unsigned     fixedPool : 1,
                 // memory consumed but returned only at pool termination
                 keepAllMemory : 1,
                 reserved : 30;

    MemPoolPolicy(rawAllocType pAlloc_, rawFreeType pFree_,
                  size_t granularity_ = 0, bool fixedPool_ = false,
                  bool keepAllMemory_ = false) :
        pAlloc(pAlloc_), pFree(pFree_), granularity(granularity_), version(TBBMALLOC_POOL_VERSION),
        fixedPool(fixedPool_), keepAllMemory(keepAllMemory_),
        reserved(0) {}
};

// enums have same values as appropriate enums from ScalableAllocationResult
// TODO: use ScalableAllocationResult in pool_create directly
enum MemPoolError {
    // pool created successfully
    POOL_OK = TBBMALLOC_OK,
    // invalid policy parameters found
    INVALID_POLICY = TBBMALLOC_INVALID_PARAM,
     // requested pool policy is not supported by allocator library
    UNSUPPORTED_POLICY = TBBMALLOC_UNSUPPORTED,
    // lack of memory during pool creation
    NO_MEMORY = TBBMALLOC_NO_MEMORY,
    // action takes no effect
    NO_EFFECT = TBBMALLOC_NO_EFFECT
};

MemPoolError pool_create_v1(intptr_t pool_id, const MemPoolPolicy *policy,
                            rml::MemoryPool **pool);

bool  pool_destroy(MemoryPool* memPool);
void *pool_malloc(MemoryPool* memPool, size_t size);
void *pool_realloc(MemoryPool* memPool, void *object, size_t size);
void *pool_aligned_malloc(MemoryPool* mPool, size_t size, size_t alignment);
void *pool_aligned_realloc(MemoryPool* mPool, void *ptr, size_t size, size_t alignment);
bool  pool_reset(MemoryPool* memPool);
bool  pool_free(MemoryPool *memPool, void *object);
}

#include <new>      /* To use new with the placement argument */

/* Ensure that including this header does not cause implicit linkage with TBB */
#ifndef __TBB_NO_IMPLICIT_LINKAGE
    #define __TBB_NO_IMPLICIT_LINKAGE 1
    #include "tbb_stddef.h"
    #undef  __TBB_NO_IMPLICIT_LINKAGE
#else
    #include "tbb_stddef.h"
#endif

#if __TBB_ALLOCATOR_CONSTRUCT_VARIADIC
 #include <utility> // std::forward
#endif

namespace tbb {

#if _MSC_VER && !defined(__INTEL_COMPILER)
    // Workaround for erroneous "unreferenced parameter" warning in method destroy.
    #pragma warning (push)
    #pragma warning (disable: 4100)
#endif

//! Meets "allocator" requirements of ISO C++ Standard, Section 20.1.5
/** The members are ordered the same way they are in section 20.4.1
    of the ISO C++ standard.
    @ingroup memory_allocation */
template<typename T>
class scalable_allocator {
public:
    typedef typename internal::allocator_type<T>::value_type value_type;
    typedef value_type* pointer;
    typedef const value_type* const_pointer;
    typedef value_type& reference;
    typedef const value_type& const_reference;
    typedef size_t size_type;
    typedef ptrdiff_t difference_type;
    template<class U> struct rebind {
        typedef scalable_allocator<U> other;
    };

    scalable_allocator() throw() {}
    scalable_allocator( const scalable_allocator& ) throw() {}
    template<typename U> scalable_allocator(const scalable_allocator<U>&) throw() {}

    pointer address(reference x) const {return &x;}
    const_pointer address(const_reference x) const {return &x;}

    //! Allocate space for n objects.
    pointer allocate( size_type n, const void* /*hint*/ =0 ) {
        return static_cast<pointer>( scalable_malloc( n * sizeof(value_type) ) );
    }

    //! Free previously allocated block of memory
    void deallocate( pointer p, size_type ) {
        scalable_free( p );
    }

    //! Largest value for which method allocate might succeed.
    size_type max_size() const throw() {
        size_type absolutemax = static_cast<size_type>(-1) / sizeof (value_type);
        return (absolutemax > 0 ? absolutemax : 1);
    }
#if __TBB_ALLOCATOR_CONSTRUCT_VARIADIC
    template<typename U, typename... Args>
    void construct(U *p, Args&&... args)
        { ::new((void *)p) U(std::forward<Args>(args)...); }
#else // __TBB_ALLOCATOR_CONSTRUCT_VARIADIC
#if __TBB_CPP11_RVALUE_REF_PRESENT
    void construct( pointer p, value_type&& value ) { ::new((void*)(p)) value_type( std::move( value ) ); }
#endif
    void construct( pointer p, const value_type& value ) {::new((void*)(p)) value_type(value);}
#endif // __TBB_ALLOCATOR_CONSTRUCT_VARIADIC
    void destroy( pointer p ) {p->~value_type();}
};

#if _MSC_VER && !defined(__INTEL_COMPILER)
    #pragma warning (pop)
#endif // warning 4100 is back

//! Analogous to std::allocator<void>, as defined in ISO C++ Standard, Section 20.4.1
/** @ingroup memory_allocation */
template<>
class scalable_allocator<void> {
public:
    typedef void* pointer;
    typedef const void* const_pointer;
    typedef void value_type;
    template<class U> struct rebind {
        typedef scalable_allocator<U> other;
    };
};

template<typename T, typename U>
inline bool operator==( const scalable_allocator<T>&, const scalable_allocator<U>& ) {return true;}

template<typename T, typename U>
inline bool operator!=( const scalable_allocator<T>&, const scalable_allocator<U>& ) {return false;}

} // namespace tbb

#if _MSC_VER
    #if (__TBB_BUILD || __TBBMALLOC_BUILD) && !defined(__TBBMALLOC_NO_IMPLICIT_LINKAGE)
        #define __TBBMALLOC_NO_IMPLICIT_LINKAGE 1
    #endif

    #if !__TBBMALLOC_NO_IMPLICIT_LINKAGE
        #ifdef _DEBUG
            #pragma comment(lib, "tbbmalloc_debug.lib")
        #else
            #pragma comment(lib, "tbbmalloc.lib")
        #endif
    #endif


#endif

#endif /* __cplusplus */

#if !defined(__cplusplus) && __ICC==1100
    #pragma warning (pop)
#endif // ICC 11.0 warning 991 is back

#endif /* __TBB_scalable_allocator_H */
