[ECOS] regarding DSR

[ECOS] regarding DSR

[Mahesh]

Hi,
    I am using Real time clock for alarms.
    My configuration is Arm pid and sid (simulator only)
    The alarm is being initialized in one thread and at the time the   
	alarm triggers, i am in one more thread.The alarm is periodic.
    How i can go to the thread which initialized that alarm.Or can i put
the part of code in DSR without going to that thread.The part of code i
am talking consists of initializing alarms and sending messages to
mailboxes.Is it permissible in DSR's.
  
Thanks and Regards
Mahesh  


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Mahesh M Patil
Software Engineer
Cranes Software International Limited
VasanthNagar
Bangalore
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Office:2381740/1/2 Extn:234
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Re: [ECOS] regarding DSR

[Andrew Lunn]

On Tue, Oct 21, 2003 at 03:29:28PM +0530, Mahesh wrote:
> Hi,
>     I am using Real time clock for alarms.
>     My configuration is Arm pid and sid (simulator only)
>     The alarm is being initialized in one thread and at the time the   
> 	alarm triggers, i am in one more thread.The alarm is periodic.
>     How i can go to the thread which initialized that alarm.Or can i put
> the part of code in DSR without going to that thread.The part of code i
> am talking consists of initializing alarms and sending messages to
> mailboxes.Is it permissible in DSR's.
 
You cannot do anything that can block in a DSR. Initializing an alarm
is OK. You have to be careful with sending a message to a
mbox. cyg_mbox_put() can block when the mbox is full. So instead you
have to use cyg_mbox_tryput() and if it fails because the message box
is full you cannot wait and try again. 

All this is documented. So please RTM.

    Andrew

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