RTEMS 4.6.1 On-Line Library

Fixed Block Manager pget_blf - Poll and Get Fixed-Size Memory Block

RTEMS ITRON 3.0 API User's Guide

10.4.4: pget_blf - Poll and Get Fixed-Size Memory Block

CALLING SEQUENCE:

ER ercd =pget_blf(
  VP *p_blf,
  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 (tmout is -2 or less)

E_DLT - The object being waited for was deleted (the specified memorypool was deleted while waiting)

E_RLWAI - WAIT state was forcibly released (rel_wai was received while waiting)

E_TMOUT - Polling failure or timeout exceeded

E_CTX - Context error (issued from task-independent portions or a task in dispatch disabled state; implementation dependent for pget_blf and tget_blf(tmout=TMO_POL))

DESCRIPTION:

The pget_blf system call has the same function as get_blf except for the waiting feature. Pget_blf polls whether or not the task should wait if get_blf is executed. The meaning of parameters to pget_blf are the same with get_blf. The specific operations by pget_blf are as follows.

- If there is a free memory block available, processing is the same as get_blf: that is, the requested memory is allocated and the system call completes normally.

- If there is no free memory block, an E_TMOUT error is returned to indicate polling failed and the system call finishes. Unlike get_blf, the issuing task does not wait in this case. Also, the issuing task does not get any memory.

NOTES:

NONE

RTEMS ITRON 3.0 API User's Guide