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ref_mbf
iref_mbf
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Reference message buffer state.
ER ref_mbf (ID mbfid, T_RMBF *pk_rmbf);
ER iref_mbf (ID mbfid, T_RMBF *pk_rmbf);
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ID mbfid;
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ID number of the message.
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T_RMBF *pk_rmbf;
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Pointer to the packet returning the message buffer state.
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[Message buffer state packet: T_RMBF]
typedef struct t_rmbf {
ID stskid; /*Existence of tasks waiting for message transmission*/
ID rtskid; /*Existence of tasks waiting for message reception*/
UINT smsgcnt; /*Number of message elements in message buffer*/
SIZE fmbfsz; /*Available buffer size*/
} T_RMBF;
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These service calls store the detailed information of the message buffer (existence of waiting tasks, number of data elements in the message buffer, etc.) specified by parameter
mbfid into the area specified by parameter
pk_rmbf.
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stskid
Stores whether a task is queued to the transmission wait queue of the message buffer.
Value: ID number of the task at the head of the transmission wait queue
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rtskid
Stores whether a task is queued to the reception wait queue of the message buffer.
Value: ID number of the task at the head of the reception wait queue
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smsgcnt
Stores the number of message elements in message buffer.
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fmbfsz
Stores available size of the message buffer (in bytes).
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- This service call was issued in the CPU locked state.
- This service call was issued in the status "PSW.IPL > kernel interrupt mask level".
Note When the iref_mbf is issued from task or the ref_mbf is issued from non-task, the context error is not detected and normal operation of the system is not guaranteed.
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Memory access violation. (only for ref_mbf)
- The operand-write access to the area indicated by pk_rmbf has not been permitted to the invoking task.
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- The message buffer specified by mbfid does not exist.
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