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trcv_mbx
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Receive from mailbox (with time-out).
ER trcv_mbx (ID mbxid, T_MSG **ppk_msg, TMO tmout);
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ID mbxid;
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ID number of the mailbox.
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T_MSG **ppk_msg;
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Start address of the message packet received from the mailbox.
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TMO tmout;
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Specified time-out (in millisecond).
Value: Specified time-out.
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typedef struct t_msg {
struct t_msg *msgnext; /*Reserved for future use*/
} T_MSG;
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[Message packet: T_MSG_PRI]
typedef struct t_msg_pri {
struct t_msg msgque; /*Reserved for future use*/
PRI msgpri; /*Message priority*/
} T_MSG_PRI;
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This service call receives a message from the mailbox specified by parameter
mbxid, and stores its start address in the area specified by parameter
ppk_msg.
If no message could be received from the target mailbox (no messages were queued to the wait queue) when this service call is issued, this service call does not receive messages but queues the invoking task to the target mailbox wait queue and moves it from the RUNNING state to the WAITING state with time-out (message reception wait state).
The receiving WAITING state for a mailbox is cancelled in the following cases.
Receiving WAITING State for a Mailbox Cancel Operation
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A message was transmitted to the target mailbox as a result of issuing snd_mbx.
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A message was transmitted to the target mailbox as a result of issuing isnd_mbx.
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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 time specified by tmout has elapsed.
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Forced release from waiting (accept del_mbx while waiting).
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Note 1 Invoking tasks are queued to the target mailbox wait queue in the order specified at creating the mailbox (FIFO order or current priority order).
Note 2
TMO_FEVR is specified for wait time
tmout, processing equivalent to
rcv_mbx will be executed. When
TMO_POL is specified, processing equivalent to
prcv_mbx 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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- Stack pointer points out of user stack for invoking task.
- The operand-write access to the area indicated by ppk_msg has not been permitted to the invoking task.
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- The mailbox specified by mbxid does not exist.
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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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