-
tget_mpf
-
Acquire fixed-sized memory block (with timeout).
ER tget_mpf ( ID mpfid, VP *p_blk, TMO tmout );
|
MOVW AX, #tmout_hi
PUSH AX
MOVW AX, #tmout_lo
PUSH AX
MOVW BC, #LOWW(_p_blk)
MOV A, #mpfid
CALL !!_tget_mpf
ADDW SP, #0x0004
|
|
|
|
|
|
|
ID mpfid;
|
ID number of the fixed-sized memory pool from which a memory block is acquired.
|
|
|
VP *p_blk;
|
Start address of the acquired memory block.
|
|
|
TMO tmout;
|
Specified timeout (unit: ticks).
TMO_FEVR: Waiting forever.
Value: Specified timeout.
|
This service call acquires the memory block from the fixed-sized memory pool specified by parameter
mpfid and stores the start address in the area specified by parameter
p_blk.
If a memory block could not be acquired from the target fixed-sized memory pool (no available memory blocks exist) when this service call is issued, memory block acquisition processing is not performed but the invoking task is queued to the target fixed-sized memory pool wait queue in the order of memory block acquisition request (FIFO order).
As a result, the invoking task is unlinked from the ready queue and is moved from the RUNNING state to the WAITING state (waiting state for a fixed-sized memory block).
The waiting state for a fixed-sized memory block is cancelled in the following cases, and then moved to the READY state.
Waiting State for a Fixed-sized Memory Block Cancel Operation
|
|
A memory block was returned to the target fixed-sized memory pool as a result of issuing rel_mpf.
|
|
Forced release from waiting (accept rel_wai while waiting).
|
|
Forced release from waiting (accept irel_wai while waiting).
|
|
Polling failure or timeout.
|
|
Note When TMO_FEVR is specified for wait time
tmout, processing equivalent to
get_mpf will be executed. When TMO_POL is specified, processing equivalent to
pget_mpf will be executed.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Polling failure or timeout.
|