November 2008 - Darwin-dev - lists.apple.com

Semaphore
by Rakesh Singhal 27 Nov '08

27 Nov '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:mime-version:content-type:content-transfer-encoding :content-disposition; bh=EBAvYevwzwtpJ2UWOD7QoCkETq9DNg83LvQvIlJ0zpM=; b=NAhm2LHKVYaHgTnaolXSccWg35lZMZ2beY7vwPVXjuUYUksOwAmsJS5n0ttzRLVpne GCU1DyV0an+KPtoTGXimTQ6rxjmL4S05j8CKUI7fJ0Igc4FD0Xz8dHQEg5B6YlNb+0jx A+nWUqsqiTfX35w2AkV+VLR+OyHOSUFmbJmBk= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:mime-version:content-type :content-transfer-encoding:content-disposition; b=oZDnjzLbTxIRpShS+UXdLPx5D5JYpHCu0foEw5b88p3ZC4kd2CSQ9optxHtb2ovDqF IzpYEraq8hxz26EPnVRhESnwOT3Ps7pY9HZ+0uLTAcphBHdx38pBiMiZQLhLAzbriw/1 fjpKaOFlySWdNhnUs/7qGt/g75R2Hhy6sgWXU= Hi all I tried to use sem_init() but I think it is not there to use. It is declared in semaphore.h but when I do man sem_init() then it gives the message "No manual entry for sem_init". Now, I am using sem_open(). I think it is right API to create unique semaphore between multi-processes. But creating it in one process if I try to create in another process, the value of semaphore is not same. I am using same name in both process(1st argument of sem_open()). Please suggest to create semaphore (cross-processes). Regards rksinghal _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Event on modem or virtual serial port
by Eli Bach 26 Nov '08

26 Nov '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:from:to :in-reply-to:content-type:content-transfer-encoding:mime-version :subject:date:references:x-mailer; bh=KChK52YoFRn5neakCab0H1onZjmZFPCF17E7Fjo2xAs=; b=T3Klo7bEa/iBI4OPHRm/AHe3bvRUMRWuJwj/dfBU699njwyxluRwi611nInwJohQTT XBNql1NZwO7Bhi+Z9cc79d0bD5jaeMjnml139j5Wtpva/9PdlgXRw7ZNB2mlLxkL+oTc 4A34KsLGg4hPW3stp8h8ippSdiWZdzB43Avqk= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:from:to:in-reply-to:content-type :content-transfer-encoding:mime-version:subject:date:references :x-mailer; b=Dp480jkwOh1JqI76zbeI20qO5M8zPCaKibu0EyKcE8kqwuCvHmLOGItgk6cymXggED QHYkEj5LbNZuteqNNyGt3KltU92mM56hjf73qhucVh0gxAyb0r62OjVx7IgpHphRr8AW dMp5k3Cc5TGYaFnjaA1J83dHJYfGxYgtgYkHU= On Nov 25, 2008, at 10:24 PM, Rakesh Singhal wrote: Hi all I want to get the notification for event on virtual serial (modem) port. I am using select() API to polling on it. I get notification in this case, but if I do not read the data or reading handling thread is busy, then also it keeps giving notification that data is there. I want to get the notification only when there any new event happen or new data comes. Eli _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Please suggest me to resolve the issue. Keep track of it yourself then. Set a flag in your own code when select() tells you the serial port has data that your 'worker' thread checks/clears before it goes idle, then stop passing that port to select() until your worker thread clears that flag. Waking up select() to re-add the port when the worker thread goes idle is left as an exercise for the reader. This email sent to site_archiver(a)lists.apple.com

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Event on modem or virtual serial port
by Rakesh Singhal 26 Nov '08

26 Nov '08

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Re: IOUserClient::getNotificationSemaphore()?
by Duane Murphy 25 Nov '08

25 Nov '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Naturally, it takes sending a message to find things. :-) Nevermind. --- At Mon, 24 Nov 2008 16:27:01 -0800, Duane Murphy wrote: >I would like to use getNotificationSemaphore() from IOUserClient. I'd >like to create a semaphore in the kernel and be able to access it from >my user space client. The semaphore would be used as a signal from the >kernel process to user space. > >How do I call the kernel getNotificationSemaphore() from user space? I >have not been able to find the corresponding user space API for this. ...Duane _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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IOUserClient::getNotificationSemaphore()?
by Duane Murphy 25 Nov '08

25 Nov '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com I would like to use getNotificationSemaphore() from IOUserClient. I'd like to create a semaphore in the kernel and be able to access it from my user space client. The semaphore would be used as a signal from the kernel process to user space. How do I call the kernel getNotificationSemaphore() from user space? I have not been able to find the corresponding user space API for this. Thanks for the help, ...Duane _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Disabling auto-mounting of CDROM
by Dan Markarian 25 Nov '08

25 Nov '08

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Re: loginwindow
by Kevin Metha 24 Nov '08

24 Nov '08

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Re: interprocess communication
by Jonas Maebe 24 Nov '08

24 Nov '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On 24 Nov 2008, at 04:28, Rakesh Singhal wrote: pthread_cond_signal() leaves the object nonsignaled like PulseEvent() in Win32. Is there any POSIX or Mac function which leaves the object signaled like SetEvent() in Win32? Counting semaphore will not fit in my case. typedef struct _persistent_event { pthread_cond_t cond; pthread_mutex_t mutex; int isset; } t_persistent_event; t_persistent_event *NewEvent(void) { t_persistent_event *event = malloc(sizeof(*event)); pthread_cond_init(&event->condvar, NULL); pthread_mutex_init(&event->mutex, NULL); event->isset=0; return event; } void SetEvent(t_persistent_event *event) { pthread_mutex_lock(&event->mutex); event->isset=1; pthread_cond_signal(&event->cond); pthread_mutex_unlock(&event->mutex); } void WaitEvent(t_persistent_event *event) { pthread_mutex_lock(&event->mutex); while (!event->isset) pthread_cond_wait(&event->condvar,&event->mutex); event->isset=0; pthread_mutex_unlock(&event->mutex); } ResetEvent() and DestroyEvent() left as an exercise to the reader. Jonas _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… There is none in the pthread_* family at least. But you can implement one on top of them using something like this (typed in Mail): This email sent to site_archiver(a)lists.apple.com

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Porting Darwin to PowerPC BookE
by feng kan 24 Nov '08

24 Nov '08

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Re: interprocess communication
by Rakesh Singhal 24 Nov '08

24 Nov '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=Ca7cZ0cA7df/2Ipiy/jRFz4VTvLnPs72qBoATrJfTTc=; b=LfclhGNcf6zW6kjX4B88kShtXzF20SMg+ctLeY3QN36DfdyWu8vx/+IMbyOCp715e0 WbLMdyUGVEv6Rbz6Pzm/w1HWTE47YP8Kg9K2q9SNb5BBfDY3/yfoYX0UuKTX38HvZjIs YHIN4qkBIMDsI6Fbk2jwA+MV8Mlr1tlmZ6r2Y= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=UPo6IZwAtfQWXJMMncEATqx8Xw6DlAvVhYeRLqgZriWuhkriDTtApECGJpCKznV/dA fqZWFrV30JunQMSBKJO0pepxzVW9DofDQ1XSbG21D6t0G6f+Jbuq+/sanmP6EYRZafIk PpZ553MIc3ngRmcWxRKYqiD1PdDHq2+fnl6h8= pthread_cond_signal() leaves the object nonsignaled like PulseEvent() in Win32. Is there any POSIX or Mac function which leaves the object signaled like SetEvent() in Win32? Counting semaphore will not fit in my case. On Sat, Nov 22, 2008 at 5:00 AM, Terry Lambert <tlambert(a)apple.com> wrote: > man pthread_cond_wait > man pthread_cond_signal > man pthread_cond_broadcast > > -- Terry > > On Nov 20, 2008, at 9:31 PM, Rakesh Singhal wrote: >> >> Yes, but I do not need counting semaphore. Binary semaphore fits in my >> case. I am looking for it to understand and then implement. >> >> Regards >> >> On Fri, Nov 21, 2008 at 2:05 AM, Terry Lambert <tlambert(a)apple.com> wrote: >>> >>> On Nov 20, 2008, at 4:07 AM, Jean-Daniel Dupas wrote: >>>> >>>> Le 20 nov. 08 à 12:30, Rakesh Singhal a écrit : >>>>> >>>>> I want some advice on Inter Process Communication (IPC). I have one >>>>> dynamic library(dylib) and one application(app). Actually I am porting >>>>> something from Windows so I will write about windows code. >>>>> >>>>> In Application, I create one event object (eventName). Now, I create >>>>> one thread and call waitForSingleObject and now it is waiting for >>>>> someone to set the event and the it will come out. In DLL I create >>>>> one event object of same name (eventName). Now, whenever I need, set >>>>> the event in DLL then in application that thread comes out of wait and >>>>> executes the code and again start waiting. >>> >>> You are describing a condition variable, which is a simplified case of a >>> counting semaphore. Google either of these. >>> >>> -- Terry > > _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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