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ref_mbx Reference mailbox status
iref_mbx Reference mailbox status (handler only)
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ER ercd = ref_mbx( ID mbxid, T_RMBX *pk_rmbx );
ER ercd = iref_mbx( ID mbxid, T_RMBX *pk_rmbx );
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ID mbxid ID number of the target mailbox
T_RMBX *pk_rmbx Pointer to the packet to which mailbox status is returned
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ER ercd Terminated normally (E_OK)
T_RMBX *pk_rmbx Pointer to the packet to which mailbox status is returned
Contents of pk_rmbx
typedef struct t_rmbx{
ID wtskid +0 2 Reception waiting task ID
T_MSG *pk_msg +4 4 Next message packet to be received
} T_RMBX;
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.include mr100.inc
ref_mbx MBXID, PK_RMBX
iref_mbx MBXID, PK_RMBX
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MBXID ID number of the target mailbox
PK_RMBX Pointer to the packet to which mailbox status is returned
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Register name Content after service call is issued
R0 Error code
R2 ID number of the target mailbox
A1 Pointer to the packet to which mailbox status is returned
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This service call returns various statuses of the mailbox indicated by mbxid.
wtskid
Returned to wtskid is the ID number of the task at the top of a reception waiting queue (the next task to be de-
queued). If no tasks are kept waiting, TSK_NONE is returned.
*pk_msg
Returned to *pk_msg is the start address of the next message to be received. If there are no messages to be re-
ceived next, NULL is returned. T_MSG* should be specified with a 32-bit address.
If this service call is to be issued from task context, use ref_mbx; if issued from non-task context, use iref_mbx.