예제 #1
0
static int __CreateNewNHeap( unsigned amount )
{
    mheapptr        p1;
    frlptr          flp;
    unsigned        brk_value;
  #if defined(__WARP__)
    ULONG           os2_alloc_flags;
  #endif

    if( !__heap_enabled )
        return( 0 );
    if( _curbrk == ~1u )
        return( 0 );
    if( __AdjustAmount( &amount ) == 0 )
        return( 0 );
  #if defined(__WINDOWS_286__)
    brk_value = (unsigned)LocalAlloc( LMEM_FIXED, amount );
    if( brk_value == 0 ) {
        return( 0 );
    }
  #elif defined(__WINDOWS_386__)
    brk_value = (unsigned)DPMIAlloc( amount );
    if( brk_value == 0 ) {
        return( 0 );
    }
  #elif defined(__WARP__)
    {
        PBYTE           p;
        APIRET          apiret;

        os2_alloc_flags = PAG_COMMIT | PAG_READ | PAG_WRITE;
        if( _os2_obj_any_supported && _os2_use_obj_any ) {
            os2_alloc_flags |= OBJ_ANY;
        }
        apiret = DosAllocMem( (PPVOID)&p, amount, os2_alloc_flags );
        if( apiret )
            return( 0 );

        brk_value = (unsigned)p;
    }
  #elif defined(__NT__)
    brk_value = (unsigned)VirtualAlloc( NULL, amount, MEM_COMMIT,
                                        PAGE_EXECUTE_READWRITE );
    //brk_value = (unsigned) LocalAlloc( LMEM_FIXED, amount );
    if( brk_value == 0 ) {
        return( 0 );
    }
  #elif defined(__CALL21__)
    {
        tag _WCNEAR *tmp_tag;

        tmp_tag = (tag _WCNEAR *)TinyMemAlloc( amount );
        if( tmp_tag == NULL ) {
            return( 0 );
        }
        /* make sure it will not look like the end of a heap */
        tmp_tag[0] = ! END_TAG;
        brk_value = (unsigned)&tmp_tag[2];
        amount -= 2 * TAG_SIZE; // 11-jun-95, subtract extra tag
    }
  #elif defined(__DOS_EXT__)
    // if( !__IsCtsNHeap() ) {
    {
        tag         *tmp_tag;

        if( _IsRational() ) {
            tmp_tag = RationalAlloc( amount );
            if( tmp_tag ) {
                amount = *tmp_tag;
            }
        } else {    /* CodeBuilder */
            tmp_tag = TinyCBAlloc( amount );
            amount -= TAG_SIZE;
        }
        if( tmp_tag == NULL ) {
            return( 0 );
        }
        brk_value = (unsigned)tmp_tag;
    }
    // Pharlap, RSI/non-zero can never call this function
  #elif defined(__RDOS__)
    brk_value = (unsigned)RdosAllocateMem( amount );
    if( brk_value == 0 ) {
        return( 0 );
    }
  #endif
    if( amount - TAG_SIZE > amount ) {
        return( 0 );
    } else {
        amount -= TAG_SIZE;
    }
    if( amount < sizeof( miniheapblkp ) + sizeof( frl ) ) {
        /* there isn't enough for a heap block (struct miniheapblkp) and
           one free block (frl) */
        return( 0 );
    }
    /* we've got a new heap block */
    p1 = (mheapptr)brk_value;
    p1->len = amount;
  #if defined(__WARP__)
    // Remeber if block was allocated with OBJ_ANY - may be in high memory
    p1->used_obj_any = ( _os2_obj_any_supported && _os2_use_obj_any );
  #endif
    // Now link it up
    flp = __LinkUpNewMHeap( p1 );
    amount = flp->len;
    /* build a block for _nfree() */
    SET_MEMBLK_SIZE_USED( flp, amount );
    ++p1->numalloc;
    p1->largest_blk = 0;
    _nfree( (PTR)flp + TAG_SIZE );
    return( 1 );
}
예제 #2
0
static int __AdjustAmount( unsigned *amount )
{
    unsigned old_amount = *amount;
    unsigned amt;
    #if ! ( defined(__WINDOWS_286__) || \
            defined(__WINDOWS_386__) || \
            defined(__WARP__)        || \
            defined(__NT__)             \
        )
        unsigned last_free_amt;
    #endif

    amt = old_amount;
    amt = ( amt + TAG_SIZE + ROUND_SIZE) & ~ROUND_SIZE;
    if( amt < old_amount ) {
        return( 0 );
    }
    #if ! ( defined(__WINDOWS_286__) || \
            defined(__WINDOWS_386__) || \
            defined(__WARP__)        || \
            defined(__NT__)             \
        )
        #if defined(__DOS_EXT__)
            if( _IsRationalZeroBase() || _IsCodeBuilder() ) {
                // Allocating extra to identify the dpmi block
                amt += sizeof(struct dpmi_hdr);
            } else {
        #else
            {
        #endif
                last_free_amt = __LastFree();   /* adjust for last free block */
                if( last_free_amt >= amt ) {
                    amt = 0;
                } else {
                    amt -= last_free_amt;
                }
            }
    #endif
    /* amount is even here */
    /*
      extra amounts        (22-feb-91 AFS)

       (1) adding a new heap needs:
           frl                    free block req'd for _nmalloc request
                                  (frl is the MINIMUM because the block
                                  may be freed)
           tag                    end of miniheap descriptor
           struct miniheapblkp    start of miniheap descriptor
       (2) extending heap needs:
           tag               free block req'd for _nmalloc request
    */
    *amount = amt;
    amt += ( (TAG_SIZE) + sizeof(frl) + sizeof(struct miniheapblkp) );
    if( amt < *amount ) return( 0 );
    if( amt < _amblksiz ) {
        /*
          _amblksiz may not be even so round down to an even number
          nb. pathological case: where _amblksiz == 0xffff, we don't
                                 want the usual round up to even
        */
        amt = _amblksiz & ~1u;
    }
    #if defined(__WINDOWS_386__) || \
        defined(__WARP__)        || \
        defined(__NT__)          || \
        defined(__CALL21__)      || \
        defined(__DOS_EXT__)     || \
        defined(__RDOS__)
        /* make sure amount is a multiple of 4k */
        *amount = amt;
        amt += 0x0fff;
        if( amt < *amount ) return( 0 );
        amt &= ~0x0fff;
    #endif
    *amount = amt;
    return( *amount != 0 );
}

#if defined(__WINDOWS_286__) || \
    defined(__WINDOWS_386__) || \
    defined(__WARP__)        || \
    defined(__NT__)          || \
    defined(__CALL21__)      || \
    defined(__DOS_EXT__)     || \
    defined(__RDOS__)
static int __CreateNewNHeap( unsigned amount )
{
    mheapptr        p1;
    frlptr          flp;
    unsigned        brk_value;

    if( !__heap_enabled ) return( 0 );
    if( _curbrk == ~1u ) return( 0 );
    if( __AdjustAmount( &amount ) == 0 ) return( 0 );
#if defined(__WINDOWS_286__)
    brk_value = (unsigned) LocalAlloc( LMEM_FIXED, amount );
    if( brk_value == 0 ) {
        return( 0 );
    }
#elif defined(__WINDOWS_386__)
    brk_value = (unsigned) DPMIAlloc( amount );
    if( brk_value == 0 ) {
        return( 0 );
    }
#elif defined(__WARP__)
    {
        PBYTE           p;

        if( DosAllocMem( (PPVOID)&p, amount, PAG_COMMIT|PAG_READ|PAG_WRITE ) ) {
            return( 0 );
        }
        brk_value = (unsigned)p;
    }
#elif defined(__NT__)
    brk_value = (unsigned) VirtualAlloc( NULL, amount, MEM_COMMIT,
                                        PAGE_EXECUTE_READWRITE );
    //brk_value = (unsigned) LocalAlloc( LMEM_FIXED, amount );
    if( brk_value == 0 ) {
        return( 0 );
    }
#elif defined(__CALL21__)
    {
        tag _WCNEAR *tmp_tag;

        tmp_tag = (tag _WCNEAR *)TinyMemAlloc( amount );
        if( tmp_tag == NULL ) {
            return( 0 );
        }
        /* make sure it will not look like the end of a heap */
        tmp_tag[0] = ! END_TAG;
        brk_value = (unsigned) &tmp_tag[2];
        amount -= 2 * TAG_SIZE; // 11-jun-95, subtract extra tag
    }
#elif defined(__DOS_EXT__)
    // if( _IsRationalZeroBase() || _IsCodeBuilder() ) {
    {
        tag         *tmp_tag;

        if( _IsRational() ) {
            tmp_tag = RationalAlloc( amount );
            if( tmp_tag ) amount = *tmp_tag;
        } else {    /* CodeBuilder */
            tmp_tag = TinyCBAlloc( amount );
            amount -= TAG_SIZE;
        }
        if( tmp_tag == NULL ) {
            return( 0 );
        }
        brk_value = (unsigned) tmp_tag;
    }
    // Pharlap, RSI/non-zero can never call this function
#elif defined(__RDOS__)
    brk_value = (unsigned) RdosAllocateMem( amount );
    if( brk_value == 0 ) {
        return( 0 );
    }
#endif
    if( amount - TAG_SIZE > amount ) {
        return( 0 );
    } else {
        amount -= TAG_SIZE;
    }
    if( amount < sizeof( struct miniheapblkp ) + sizeof( frl ) ) {
        /* there isn't enough for a heap block (struct miniheapblkp) and
           one free block (frl) */
        return( 0 );
    }
    /* we've got a new heap block */
    p1 = (mheapptr) brk_value;
    p1->len = amount;
    // Now link it up
    flp = __LinkUpNewMHeap( p1 );
    amount = flp->len;
    /* build a block for _nfree() */
    flp->len = amount | 1;
    ++p1->numalloc;                         /* 28-dec-90 */
    p1->largest_blk = 0;
    _nfree( (PTR)flp + TAG_SIZE );
    return( 1 );
}