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RTEMS 4.10.0 On-Line Library


Fixed Block Manager ref_mpf - Reference Fixed-Size Memorypool Status

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10.4.7: ref_mpf - Reference Fixed-Size Memorypool Status

CALLING SEQUENCE:

ER ref_mpf(
  T_RMPF *pk_rmpf,
  ID mpfid
);

STATUS CODES:

E_OK - Normal Completion

E_ID - Invalid ID number (mpfid was invalid or could not be used)

E_NOEXS - Object does not exist \(the memorypool specified by mpfid does not exist.)

E_OACV - Object access violation (A mpfid less than -4 was specified from a user task. This is implementation dependent.)

E_PAR - Parameter error (the packet address for the return parameters could not be used)

DESCRIPTION:

This system call refers to the state of the fixed-size memorypool specified by mpfid, and returns the current number of free blocks (frbcnt), information of a task waiting to be allocated memory (wtsk), and its extended information (exinf). Wtsk indicates whether or not there is a task waiting to be allocated memory from the fixed-size memorypool specified. If there is no waiting task, wtsk is returned as FALSE = 0. If there is a waiting task, wtsk is returned as a value other than 0.

NOTES:

While the frsz return parameter of ref_mpl returns the total size of free memory, the frbcnt return parameter of ref_mpf returns the number of free blocks.

Depending on the implementation, additional information besides wtsk and frbcnt (such as memorypool attributes, mpfatr) may also be referred.


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