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tget_mpf
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Acquire fixed-sized memory block (with time-out).
ER tget_mpf (ID mpfid, VP *p_blk, TMO tmout);
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ID mpfid;
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ID number of the fixed-sized memory pool.
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VP *p_blk;
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Start address of the acquired memory block.
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TMO tmout;
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Specified time-out (in millisecond).
Value: Specified time-out.
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This service call acquires the fixed-sized 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 no fixed-size memory blocks could be acquired from the target fixed-size memory pool (no available fixed-size memory blocks exist) when this service call is issued, this service call does not acquire the fixed-size memory block but queues the invoking task to the target fixed-size memory pool wait queue and moves it from the RUNNING state to the WAITING state with time-out (fixed-size memory block acquisition wait state).
The WAITING state for a fixed-sized memory block is cancelled in the following cases.
WAITING State for a Fixed-sized Memory Block Cancel Operation
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A fixed-sized memory block was returned to the target fixed-sized memory pool as a result of issuing rel_mpf.
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A fixed-sized memory block was returned to the target fixed-sized memory pool as a result of issuing irel_mpf.
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Forced release from waiting (accept rel_wai while waiting).
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Forced release from waiting (accept irel_wai while waiting).
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The fixed-sized memory pool is reset as a result of issuing vrst_mpf.
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The time specified by tmout has elapsed.
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Note 1 Invoking tasks are queued to the target fixed-size memory pool wait queue in the order defined during configuration (FIFO order or current priority order).
Note 2 The contents of the block are undefined.
Note 3 The boundary alignment for the memory blocks acquired is 1. If memory blocks need to be acquired with a larger boundary alignment than that, observe the following:
Note 4
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.
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- This service call was issued from a non-task.
- This service call was issued in the CPU locked state.
- This service call was issued in the dispatching disabled state.
- This service call was issued in the status "PSW.IPL > kernel interrupt mask level".
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Forced release from the WAITING state.
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Polling failure or specified time has elapsed.
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Released from WAITING state by the object reset ( vrst_mpf)
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