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//==========================================================================
//
//      kapi.cxx
//
//      Implementation of kernel C API functions for memory pools
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
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//
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// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
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//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    nickg, dsm, jlarmour
// Contributors: 
// Date:         2000-06-12
// Description:  Implementation of kernel C API functions for memory pools
// Usage:        
//              
//
//####DESCRIPTIONEND####
//
//==========================================================================
 
// CONFIGURATION
 
#include <pkgconf/memalloc.h>
#include <pkgconf/system.h>
#ifdef CYGPKG_KERNEL
# include <pkgconf/kernel.h>
#endif
 
#ifdef CYGFUN_MEMALLOC_KAPI
 
// INCLUDES
 
#include <cyg/infra/cyg_type.h>        // types
#include <cyg/infra/cyg_ass.h>         // assertion macros
#include <cyg/infra/cyg_trac.h>        // tracing macros
#include <cyg/kernel/ktypes.h>         // base kernel types
 
#include <cyg/memalloc/memvar.hxx>
#include <cyg/memalloc/memfixed.hxx>
#include <cyg/memalloc/common.hxx>     // status flags
 
#include <cyg/kernel/kapi.h>           // C API
 
// MACROS
 
#ifdef CYGDBG_USE_ASSERTS
 
#define CYG_ASSERT_SIZES(cstruct, cxxstruct)                      \
CYG_MACRO_START                                                   \
    char *msg = "Size of C struct " #cstruct                      \
                       " != size of C++ struct " #cxxstruct ;     \
    CYG_ASSERT( sizeof(cstruct) == sizeof(cxxstruct) , msg );     \
CYG_MACRO_END
 
#else
 
#define CYG_ASSERT_SIZES(cstruct, cxxstruct)
 
#endif
 
// FUNCTIONS
 
// -------------------------------------------------------------------------
// Magic new function
 
inline void *operator new(size_t size, void *ptr)
{
    CYG_CHECK_DATA_PTR( ptr, "Bad pointer" );
    return ptr;
}
 
/*-----------------------------------------------------------------------*/
/* Memory pools                                                          */
 
/* Create a variable size memory pool */
externC void cyg_mempool_var_create(
    void            *base,              /* base of memory to use for pool */
    cyg_int32       size,               /* size of memory in bytes        */
    cyg_handle_t    *handle,            /* returned handle of memory pool */
    cyg_mempool_var *var                /* space to put pool structure in */
    )
{
    CYG_ASSERT_SIZES( cyg_mempool_var, Cyg_Mempool_Variable );
 
    Cyg_Mempool_Variable *t = new((void *)var) Cyg_Mempool_Variable (
        (cyg_uint8 *)base,
        size
    );
    t=t;
 
    CYG_CHECK_DATA_PTR( handle, "Bad handle pointer" );
    *handle = (cyg_handle_t)var;
}
 
/* Delete variable size memory pool */
externC void cyg_mempool_var_delete(cyg_handle_t varpool)
{
    ((Cyg_Mempool_Variable *)varpool)->~Cyg_Mempool_Variable();
}
 
/* Allocates a block of length size.  This waits if the memory is not
   currently available.  */
#ifdef CYGSEM_MEMALLOC_ALLOCATOR_VARIABLE_THREADAWARE
externC void *cyg_mempool_var_alloc(cyg_handle_t varpool, cyg_int32 size)
{
    return ((Cyg_Mempool_Variable *)varpool)->alloc(size);
}
 
# ifdef CYGFUN_KERNEL_THREADS_TIMER
 
/* Allocates a block of length size.  This waits for up to delay
   ticks, if the memory is not already available.  NULL is returned if
   no memory is available. */
externC void *cyg_mempool_var_timed_alloc(
    cyg_handle_t     varpool,
    cyg_int32        size,
    cyg_tick_count_t abstime)
{
    return ((Cyg_Mempool_Variable *)varpool)->alloc(size, abstime);
}
 
# endif
#endif
 
/* Allocates a block of length size.  NULL is returned if no memory is
   available. */
externC void *cyg_mempool_var_try_alloc(
    cyg_handle_t varpool,
    cyg_int32    size)
{
    return ((Cyg_Mempool_Variable *)varpool)->try_alloc(size);
}
 
/* Frees memory back into variable size pool. */
externC void cyg_mempool_var_free(cyg_handle_t varpool, void *p)
{
    cyg_bool b;
    b = ((Cyg_Mempool_Variable *)varpool)->free((cyg_uint8 *)p, 0);
    CYG_ASSERT( b, "Bad free");
}
 
 
/* Returns true if there are any threads waiting for memory in the
   given memory pool. */
externC cyg_bool_t cyg_mempool_var_waiting(cyg_handle_t varpool)
{
    Cyg_Mempool_Variable *v = (Cyg_Mempool_Variable *)varpool;
    Cyg_Mempool_Status stat;
 
    v->get_status( CYG_MEMPOOL_STAT_WAITING, stat );
    return (stat.waiting != 0);
}
 
/* Puts information about a variable memory pool into the structure
   provided. */
externC void cyg_mempool_var_get_info(
    cyg_handle_t varpool,
    cyg_mempool_info *info)
{
    Cyg_Mempool_Variable *v = (Cyg_Mempool_Variable *)varpool;
    Cyg_Mempool_Status stat;
 
    v->get_status( CYG_MEMPOOL_STAT_ARENASIZE|
                   CYG_MEMPOOL_STAT_TOTALFREE|
                   CYG_MEMPOOL_STAT_ARENABASE|
                   CYG_MEMPOOL_STAT_ORIGSIZE|
                   CYG_MEMPOOL_STAT_MAXFREE, stat );
 
    info->totalmem = stat.arenasize;
    info->freemem  = stat.totalfree;
    info->size = stat.origsize;
    info->base = const_cast<cyg_uint8 *>(stat.arenabase);
    info->blocksize  = -1;
    info->maxfree = stat.maxfree;
}
 
 
/* Create a fixed size memory pool */
externC void cyg_mempool_fix_create(
    void            *base,              // base of memory to use for pool
    cyg_int32       size,               // size of memory in byte
    cyg_int32       blocksize,          // size of allocation in bytes
    cyg_handle_t    *handle,            // handle of memory pool
    cyg_mempool_fix *fix                // space to put pool structure in
    )
{
    CYG_ASSERT_SIZES( cyg_mempool_fix, Cyg_Mempool_Fixed );
 
    Cyg_Mempool_Fixed *t = new((void *)fix) Cyg_Mempool_Fixed (
        (cyg_uint8 *)base,
        size,
        blocksize
    );
    t=t;
 
    CYG_CHECK_DATA_PTR( handle, "Bad handle pointer" );
    *handle = (cyg_handle_t)fix;
}
 
/* Delete fixed size memory pool */
externC void cyg_mempool_fix_delete(cyg_handle_t fixpool)
{
    ((Cyg_Mempool_Fixed *)fixpool)->~Cyg_Mempool_Fixed();
}
 
#ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
/* Allocates a block.  This waits if the memory is not
   currently available.  */
externC void *cyg_mempool_fix_alloc(cyg_handle_t fixpool)
{
    return ((Cyg_Mempool_Fixed *)fixpool)->alloc();
}
 
# ifdef CYGFUN_KERNEL_THREADS_TIMER
 
/* Allocates a block.  This waits for up to delay ticks, if the memory
   is not already available.  NULL is returned if no memory is
   available. */
externC void *cyg_mempool_fix_timed_alloc(
    cyg_handle_t     fixpool,
    cyg_tick_count_t abstime)
{
    return ((Cyg_Mempool_Fixed *)fixpool)->alloc(abstime);
}
 
# endif
#endif
 
/* Allocates a block.  NULL is returned if no memory is available. */
externC void *cyg_mempool_fix_try_alloc(cyg_handle_t fixpool)
{
    return ((Cyg_Mempool_Fixed *)fixpool)->try_alloc();
}
 
/* Frees memory back into fixed size pool. */
externC void cyg_mempool_fix_free(cyg_handle_t fixpool, void *p)
{
    cyg_bool b;
    b = ((Cyg_Mempool_Fixed *)fixpool)->free((cyg_uint8 *)p);
    CYG_ASSERT( b, "Bad free");
}
 
/* Returns true if there are any threads waiting for memory in the
   given memory pool. */
externC cyg_bool_t cyg_mempool_fix_waiting(cyg_handle_t fixpool)
{
    Cyg_Mempool_Fixed *f = (Cyg_Mempool_Fixed *)fixpool;
    Cyg_Mempool_Status stat;
 
    f->get_status( CYG_MEMPOOL_STAT_WAITING, stat );
    return (stat.waiting != 0);
}
 
/* Puts information about a fixed block memory pool into the structure
   provided. */
externC void cyg_mempool_fix_get_info(
    cyg_handle_t fixpool,
    cyg_mempool_info *info)
{
    Cyg_Mempool_Fixed *f = (Cyg_Mempool_Fixed *)fixpool;
    Cyg_Mempool_Status stat;
 
    f->get_status( CYG_MEMPOOL_STAT_ARENASIZE|
                   CYG_MEMPOOL_STAT_TOTALFREE|
                   CYG_MEMPOOL_STAT_ARENABASE|
                   CYG_MEMPOOL_STAT_ORIGSIZE|
                   CYG_MEMPOOL_STAT_BLOCKSIZE|
                   CYG_MEMPOOL_STAT_MAXFREE, stat );
 
    info->totalmem = stat.arenasize;
    info->freemem  = stat.totalfree;
    info->size = stat.origsize;
    info->base = const_cast<cyg_uint8 *>(stat.arenabase);
    info->blocksize  = stat.blocksize;
    info->maxfree = stat.maxfree;
}
 
// -------------------------------------------------------------------------
// Check structure sizes.
// This class and constructor get run automatically in debug versions
// of the kernel and check that the structures configured in the C
// code are the same size as the C++ classes they should match.
 
#ifdef CYGPKG_INFRA_DEBUG
 
class Cyg_Check_Mem_Structure_Sizes
{
    int dummy;
public:    
    Cyg_Check_Mem_Structure_Sizes( int x );
 
};
 
#define CYG_CHECK_SIZES(cstruct, cxxstruct)                               \
if( sizeof(cstruct) != sizeof(cxxstruct) )                                \
{                                                                         \
    char *fmt = "Size of C struct " #cstruct                              \
                " != size of C++ struct " #cxxstruct ;                    \
    CYG_TRACE2(1, fmt, sizeof(cstruct) , sizeof(cxxstruct) );             \
    fail = true;                                                          \
    fmt = fmt;                                                            \
}
 
Cyg_Check_Mem_Structure_Sizes::Cyg_Check_Mem_Structure_Sizes(int x)
{
    cyg_bool fail = false;
 
    dummy = x+1;
 
    CYG_CHECK_SIZES( cyg_mempool_var, Cyg_Mempool_Variable );
    CYG_CHECK_SIZES( cyg_mempool_fix, Cyg_Mempool_Fixed );
 
    CYG_ASSERT( !fail, "Size checks failed");
}
 
static Cyg_Check_Mem_Structure_Sizes cyg_memalloc_check_structure_sizes(1);
 
#endif
 
// -------------------------------------------------------------------------
 
 
#endif // ifdef CYGFUN_MEMALLOC_KAPI
 
// End of kapi.cxx