PxMcTakeBlk()

Take a block from memory class.

APPLIES TO

1.0.0

SYNOPSIS
PxMptr_t PxMcTakeBlk (PxMc_t mcid, PxSize_t size);
ARGUMENTS






mcid




The memory class handle, the block is taken from


















size




Requested size

















RETURN VALUES






    

  • 

    Start adress of block on success
    

    • 

  • 

    Null pointer on failure
    

    • 







ERROR CODES















PXERR_MC_ILLMC




mcid is not a valid memory class








PXERR_MC_NOMEM




Not enough memory in the memory class to satisfy the request








PXERR_ACCESS_RIGHT




The calling task has not the right to access the memory class








PXERR_MC_USE_BUDDY_FOR_MSG_ONLY




Buddy memory classes must only be used for messages








PXERR_GLOBAL_ILLEGAL_CORE




The requested memory class is not on the same core








PXERR_MC_ILLTYPE




Illegal MC type for PxMcTakeBlk








PXERR_INIT_ILLMCTYPE




The type for PXMcSystemdefault is different from PXMcVarsized, PXMcVarsizedAdjusted and PXMcVarsizedAligned








PXERR_MC_DAMAGED_BLOCK




The block in the memory class has been damaged








PXERR_MC_INCONSISTENCY




Inconsistency in memory class: blk








PXERR_MC_ILLALIGN




Invalid memory block or size alignment in memory insert








PXERR_MC_ILLSIZE




Insufficient block size








PXERR_REQUEST_ABORTED




Request aborted








PXERR_MC_SIZETOOBIG




Fixed block size too small to satisfy the request








PXERR_UNSUPPORTED_MCTYPE




mc is not supported (If mcid corresponds to PXMcVarsized, PXMcVarsizedAligned, PXMcVarsizedAdjusted)









DESCRIPTION










PxMcTakeBlk takes a block of a size no less than size (specified in byte units) from mcid and returns its address.






















IMPLEMENTATION GUIDELINES
















Before call






    

  • 

    mcid must be:
    

    

      

    • 

      a valid PXROS-HR memory class created with a PxMcRequest call (V). The validity of mcid may also be checked by the PxMcIsValid macro (F).
      

      • 

    • 

      the symbolic value PXMcSystemdefault specfying the system memory class (V)
      

      • 

    • 

      the symbolic value PXMcTaskdefault specifying the task’s memory class (V)
      

      • 

    

    

    • 

  • 

    The memory class must be created on the same core as the caller runs on. The creator core id can be read with the macro PxMcCoreId and the own core id with PxGetCoreId (C).
    

    • 

  • 

    size must be a plausible value given as a constant (V) or a variable (C).
    

    • 



















After call






    

  • 

    PxMcTakeBlk returns a null pointer on failure (C).
    

    • 



















Best Practice






    

  • 

    PxMcTakeBlk should only be called during initialization to ensure the availability of the memory block.
    

    • 






























SEE ALSO











USAGE








#include "pxdef.h"

PxMptr_t Buf = PxMcTakeBlk(mcid, 16)

if (Buf == NULL) {
    // Report error
}