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tget_mpl
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Acquire variable-sized memory block (with timeout).
ER tget_mpl (ID mplid, UINT blksz, VP *p_blk, TMO tmout);
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ID mplid;
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ID number of the variable-sized memory pool from which a memory block is acquired.
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UINT blksz;
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Memory block size to be acquired (in bytes).
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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 timeout (unit:millisecond).
TMO_FEVR: Waiting forever.
Value: Specified timeout.
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This service call acquires a variable-size memory block of the size specified by parameter
blksz from the variable-size memory pool specified by parameter
mplid, and stores its start address into the area specified by parameter
p_blk.
If no variable-size memory blocks could be acquired from the target variable-size memory pool (no successive areas equivalent to the requested size were available) when this service call is issued, this service call does not acquire variable-size memory blocks but queues the invoking task to the target variable-size memory pool wait queue and moves it from the RUNNING state to the WAITING state with timeout (variable-size memory block acquisition wait state).
The WAITING state for a variable-sized memory block is cancelled in the following cases, and then moved to the READY state.
WAITING State for a Variable-sized Memory Block Cancel Operation
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The variable-size memory block that satisfies the requested size was returned to the target variable-size memory pool as a result of issuing rel_mpl.
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The variable-size memory block that satisfies the requested size was returned to the target variable-size memory pool as a result of issuing irel_mpl.
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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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Polling failure or timeout.
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Note 1 The RI850V4 acquires variable-size memory blocks in the unit of "integral multiple of 4". If a value other than an integral multiple of 4 is specified for parameter
blksz, it is rounded up to be an integral multiple of 4.
Note 2 Invoking tasks are queued to the target variable-size memory pool wait queue in the order defined during configuration (FIFO order or priority order).
Note 3 If the variable-size memory block acquisition wait state is cancelled because
rel_wai or
irel_wai was issued or the wait time elapsed, the contents in the area specified by parameter
p_blk become undefined.
Note 4 TMO_FEVR is specified for wait time
tmout, processing equivalent to
get_mpl will be executed. When TMO_POL is specified, processing equivalent to
pget_mpl /
ipget_mpl will be executed.
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- mplid > Maximum ID number
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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.
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- Specified variable-sized memory pool is not registered.
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Forced release from the WAITING state.
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- Polling failure or timeout.
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