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RX703100 Datasheet

  • RX703100

  • RX850 Pro for Basics | User＇s Manual[04/2003]

  • 290頁(yè)

  • ETC

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CHAPTER 11 SYSTEM CALLS
This chapter describes the system calls supported by the RX850 Pro.
11.1 Overview
A system call is a procedure or function for invoking RX850 Pro service routines from the user鈥檚 processing
programs (tasks/non-tasks).
The user can use system calls to indirectly manipulate those resources (such as
counters and queues) that are managed directly by the RX850 Pro.
The RX850 Pro supports its own seven system calls as well as the 65 defined in the
碌
ITRON3.0 specifications,
thus enhancing the versatility of application systems.
System calls can be classified into the following seven groups, according to their functions.
(1) Task management system calls (14)
These system calls are used to manipulate the status of a task.
This group provides functions for creating, activating, terminating, and deleting a task, a function for disabling
and resuming dispatch processing, a function for changing the task priority, a function for rotating a task
ready queue, a function for forcibly releasing a task from the wait state, and a function for referencing the task
status.
cre_tsk
ter_tsk
rel_wai
del_tsk
dis_dsp
get_tid
sta_tsk
ena_dsp
ref_tsk
ext_tsk
chg_pri
vget_tid
exd_tsk
rot_rdq
(2) Task-associated synchronization system calls (7)
These system calls perform synchronous operations associated with tasks.
This group provides a function for placing a task in the suspend state and restarting a suspended task, a
function for placing a task in the wake-up wait state and waking up a task currently in the wake-up wait state,
and another function for canceling a task wake-up request.
sus_tsk
wup_tsk
rsm_tsk
can_wup
frsm_tsk
slp_tsk
tslp_tsk
(3) Synchronous communication system calls (25)
These system calls are used for the synchronization (exclusive control and queuing) and communication
between tasks.
This group provides a function for manipulating semaphores, a function for manipulating events and flags,
and a function for manipulating mailboxes.
cre_sem
twai_sem
set_flg
ref_flg
rcv_msg
del_sem
ref_sem
clr_flg
vget_flg
prcv_msg
sig_sem
vget_sid
wai_flg
cre_mbx
trcv_msg
wai_sem
cre_flg
pol_flg
del_mbx
ref_mbx
preq_sem
del_flg
twai_flg
snd_msg
vget_mid
94
User鈥檚 Manual U13773EJ3V0UM

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