Semaphores in DSP/BIOS
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From: 42Bastian Schick on 29 May 2010 02:22 On Fri, 28 May 2010 16:00:45 -0700, Tim Wescott <tim(a)seemywebsite.now> wrote: >> The main point is this: isn't there a "type" of semaphore usually >> provided in other OSes which allows multiple tasks to pend on a >> "single" post? > >Yes. It's called a 'binary semaphore'. Sometimes it's called an >'event' or a 'flag'. A complete RTOS should have both: many have just Bah, a 'complete RTOS' ?! What is this? Why is having semaphore a measure for the completeness of an RTOS ? -- 42Bastian Do not email to bastian42(a)yahoo.com, it's a spam-only account :-) Use <same-name>@monlynx.de instead !
From: Tim Wescott on 29 May 2010 02:27 On 05/28/2010 11:22 PM, 42Bastian Schick wrote: > On Fri, 28 May 2010 16:00:45 -0700, Tim Wescott<tim(a)seemywebsite.now> > wrote: > >>> The main point is this: isn't there a "type" of semaphore usually >>> provided in other OSes which allows multiple tasks to pend on a >>> "single" post? >> >> Yes. It's called a 'binary semaphore'. Sometimes it's called an >> 'event' or a 'flag'. A complete RTOS should have both: many have just > > Bah, a 'complete RTOS' ?! What is this? Why is having semaphore a > measure for the completeness of an RTOS ? > Because I said so, before you weighed in. -- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
From: D Yuniskis on 29 May 2010 05:04 Tim Wescott wrote: > On 05/28/2010 11:22 PM, 42Bastian Schick wrote: >> On Fri, 28 May 2010 16:00:45 -0700, Tim Wescott<tim(a)seemywebsite.now> >> wrote: >> >>>> The main point is this: isn't there a "type" of semaphore usually >>>> provided in other OSes which allows multiple tasks to pend on a >>>> "single" post? >>> >>> Yes. It's called a 'binary semaphore'. Sometimes it's called an >>> 'event' or a 'flag'. A complete RTOS should have both: many have just >> >> Bah, a 'complete RTOS' ?! What is this? Why is having semaphore a >> measure for the completeness of an RTOS ? >> > Because I said so, before you weighed in. ROTFL! +1 Tim! ;-)
From: 42Bastian Schick on 29 May 2010 05:15 On Fri, 28 May 2010 23:27:21 -0700, Tim Wescott <tim(a)seemywebsite.now> wrote: >On 05/28/2010 11:22 PM, 42Bastian Schick wrote: >> On Fri, 28 May 2010 16:00:45 -0700, Tim Wescott<tim(a)seemywebsite.now> >> wrote: >>> >>> Yes. It's called a 'binary semaphore'. Sometimes it's called an >>> 'event' or a 'flag'. A complete RTOS should have both: many have just >> >> Bah, a 'complete RTOS' ?! What is this? Why is having semaphore a >> measure for the completeness of an RTOS ? >> >Because I said so, before you weighed in. Then it is ok. I go back to my corner and be ashamed :-) -- 42Bastian Do not email to bastian42(a)yahoo.com, it's a spam-only account :-) Use <same-name>@monlynx.de instead !
From: Tim Wescott on 29 May 2010 13:49
On 05/29/2010 02:15 AM, 42Bastian Schick wrote: > On Fri, 28 May 2010 23:27:21 -0700, Tim Wescott<tim(a)seemywebsite.now> > wrote: > >> On 05/28/2010 11:22 PM, 42Bastian Schick wrote: >>> On Fri, 28 May 2010 16:00:45 -0700, Tim Wescott<tim(a)seemywebsite.now> >>> wrote: >>>> >>>> Yes. It's called a 'binary semaphore'. Sometimes it's called an >>>> 'event' or a 'flag'. A complete RTOS should have both: many have just >>> >>> Bah, a 'complete RTOS' ?! What is this? Why is having semaphore a >>> measure for the completeness of an RTOS ? >>> >> Because I said so, before you weighed in. > > Then it is ok. I go back to my corner and be ashamed :-) > Good. I'll pat myself on the back. Note that I don't think that one necessarily _needs_ a "complete" RTOS (whatever that is), but if there were one out there it would certainly have both flavors of semaphores. -- Tim Wescott Control system and signal processing consulting www.wescottdesign.com |