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RX703100 Datasheet

  • RX703100

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

  • 290頁

  • ETC

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CHAPTER 4 SYNCHRONOUS COMMUNICATION FUNCTIONS
4.2.1 Generating semaphores
The RX850 Pro provides two interfaces for generating semaphores.
semaphore by issuing a system call from within a processing program.
To generate a semaphore in the RX850 Pro, an area in system memory is allocated for managing that semaphore
(as an object of management by the RX850 Pro), then initialized.
(1) Static registration of a semaphore
To statically register a semaphore, specify it during configuration.
The RX850 Pro generates that semaphore according to the semaphore information defined in the information
file (including system information tables and system information header files) during system initialization. The
semaphore is subsequently managed by the RX850 Pro.
(2) Dynamic registration of a semaphore
To dynamically register a semaphore, issue the cre_sem system call from within a processing program (task).
The RX850 Pro generates that semaphore according to the information specified with parameters when the
cre_sem system call is issued. The semaphore is subsequently managed by the RX850 Pro.
4.2.2 Deleting semaphores
A semaphore is deleted by issuing the del_sem system call.
鈥?/div>
del_sem system call
The del_sem system call deletes the semaphore specified by the parameter.
That semaphore is then no longer managed by the RX850 Pro.
If a task is queued into the wait queue of the semaphore specified by this system call parameter, that task is
removed from the wait queue, after which it leaves the wait state (the resource wait state) and enters the ready
state.
E_DLT is returned to the task released from the wait state as the value returned in response to the system call
(wai_sem or twai_sem) that triggered the transition of the task to the wait state.
4.2.3 Returning resources
A resource is returned by issuing the sig_sem system call.
鈥?/div>
sig_sem system call
By issuing the sig_sem system call, the task returns a resource to the semaphore specified by the parameter
(the semaphore counter is incremented by 0x1).
If a task or tasks are queued into the wait queue of the semaphore specified by these system call parameter,
the relevant resource is passed to the first task in the wait queue without being returned to the semaphore
(thus, the semaphore counter is not incremented).
That task is then removed from the wait queue, after which it either leaves the wait state (the resource wait
state) and enters the ready state, or leaves the wait-suspend state and enters the suspend state.
One enables the static generation of a
The other dynamically generates a
semaphore during system initialization (in the nucleus initialization section).
38
User鈥檚 Manual U13773EJ3V0UM

RX703100相關(guān)型號(hào)PDF文件下載

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  • 英文版
    RD850 Task Debugger Windows(TM) based | User＇s Manual[06/20...
    ETC
  • 英文版
    RD850 Task Debugger Windows(TM) based | User＇s Manual[06/20...
  • 英文版
    RX850 Pro for Basics | User＇s Manual[04/2003]
    ETC
  • 英文版
    RX850 Pro for Basics | User＇s Manual[04/2003]

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