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

Re: Semaphore
by Philip Aker 01 Dec '08

01 Dec '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On 2008-11-30, at 20:41:02, Rakesh Singhal wrote: I would like to ask how brazen it is to install at this location. Philip Aker echo astwta@lvpc.dslh@nl | tr a-z@. p-za-o.@ Democracy: Two wolves and a sheep voting on lunch. _______________________________________________ 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… The dylib will be installed in /usr/lib/ … I normally work a couple of levels up the hierarchy and, as a third party developer, wouldn't (for example) install anything in /System/ Library/Frameworks. This email sent to site_archiver(a)lists.apple.com

1 0

Re: Semaphore
by Rakesh Singhal 01 Dec '08

01 Dec '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=nkKnY+9vs684G9WDhJFsDIAH963dMTUcTvFLkVOe2gM=; b=anhA9qNcbI0hjhzNC9jhS0j8K3YBw0+lCChm6HBG/XmQ+Bhl3Qhyl/87XKmcXgK/1o pcbiXoFt6WvBeXQ8qRtiTx58uiNtBstGoExApdl4dSHTpy16T3tCQj255S9iGgzKs1ir ZawOU0H2A94vum1k3QGJqmzhsi3xLTcy1lZDA= 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=pgQZRB4AulloECZwRUJsVTjXRRJKZs1cyNl8unbwnRM5vpHwrQ7X6LxjdBqiAr+PwG vRa2NRpl65Cd2GIe+c45BxBCwfnM5RvzotHqB5J94S8LOAjyY29jdjTSy2VwpnmQHwdo +Ku+reapGuOY3oEIzQ91SztQOk2/g3TmZTo1g= The dylib will be installed in /usr/lib/ so I can give path "/usr/lib/libMyDylib.dylib". Yes it is a good idea. Currently both are in different folders and I am giving "./" path in both (dylib and app) and generating same key. I hope it would work. Thanks a lot. Regards rksinghal On Mon, Dec 1, 2008 at 9:48 AM, Luke Hiesterman <luketheh(a)apple.com> wrote: > How about the path of the library? It must be in some known location to be > loaded at runtime. > > Luke > > Sent from my iPhone. > > On Nov 30, 2008, at 8:07 PM, Rakesh Singhal <rakesh.singhal(a)gmail.com> > wrote: > >> Yes that is my query what path to choose to make sure that it would >> generate same key in both dylib and app. >> >> regards >> >> On Mon, Dec 1, 2008 at 9:16 AM, Luke Hiesterman <luketheh(a)apple.com> >> wrote: >>> >>> If you use the same path and same id for ftok on both processes then you >>> will get the same key for use with semget. This is precisely the purpose >>> of >>> ftok. >>> >>> Luke >>> >>> Sent from my iPhone. >>> >>> On Nov 30, 2008, at 7:15 PM, Rakesh Singhal <rakesh.singhal(a)gmail.com> >>> wrote: >>> >>>> Thanks. The problem I have to give file path to generate key. How will >>>> I ensure that the path I am giving will work always to generate the >>>> same key? I have one application and another is dynamic library and I >>>> want to generate the same key in both to use. >>>> >>>> Regards >>>> rksinghal >>>> >>>> >>>> On Mon, Dec 1, 2008 at 12:56 AM, Luke Hiesterman <luketheh(a)apple.com> >>>> wrote: >>>>> >>>>> Why exactly do you want to avoid ftok? It's a good way to generate >>>>> shared >>>>> keys. >>>>> >>>>> It's always possible to generate an integer key some other way yourself >>>>> and >>>>> then you just have to figure out how to communicate it across >>>>> processes. >>>>> You >>>>> could write it to a file or send it over a socket. >>>>> >>>>> Luke >>>>> >>>>> Sent from my iPhone. >>>>> >>>>> On Nov 30, 2008, at 3:25 AM, Rakesh Singhal <rakesh.singhal(a)gmail.com> >>>>> wrote: >>>>> >>>>>> Is it possible to use semget() without using ftok() for IPC >>>>>> communication? >>>>>> >>>>>> Please suggest me. >>>>>> >>>>>> Regards >>>>>> rksinghal >>>>>> >>>>>> On Fri, Nov 28, 2008 at 9:54 AM, Rakesh Singhal >>>>>> <rakesh.singhal(a)gmail.com> wrote: >>>>>>> >>>>>>> Thanks. Now I am using following set of APIs: >>>>>>> >>>>>>> ftok() >>>>>>> semget() >>>>>>> semop() >>>>>>> semctl() >>>>>>> >>>>>>> It is working till now :) >>>>>>> >>>>>>> Regards >>>>>>> rksinghal >>>>>>> >>>>>>> On Thu, Nov 27, 2008 at 9:49 AM, Terry Lambert <tlambert(a)apple.com> >>>>>>> wrote: >>>>>>>> >>>>>>>> On Nov 26, 2008, at 7:31 PM, Rakesh Singhal wrote: >>>>>>>>> >>>>>>>>> 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). >>>>>>>> >>>>>>>> POSIX unnamed semaphores are not supported. >>>>>>>> >>>>>>>> Use either POSIX named semaphores, or use System V semaphores: >>>>>>>> >>>>>>>> man sem_open >>>>>>>> man semget >>>>>>>> >>>>>>>> -- 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

1 0

Re: Semaphore
by Luke Hiesterman 01 Dec '08

01 Dec '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Luke Sent from my iPhone. Yes that is my query what path to choose to make sure that it would generate same key in both dylib and app. regards Luke Sent from my iPhone. Regards rksinghal Luke Sent from my iPhone. Is it possible to use semget() without using ftok() for IPC communication? Please suggest me. Regards rksinghal On Fri, Nov 28, 2008 at 9:54 AM, Rakesh Singhal <rakesh.singhal(a)gmail.com> wrote: Thanks. Now I am using following set of APIs: ftok() semget() semop() semctl() It is working till now :) Regards rksinghal Hi all POSIX unnamed semaphores are not supported. Use either POSIX named semaphores, or use System V semaphores: man sem_open man semget -- 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… How about the path of the library? It must be in some known location to be loaded at runtime. On Nov 30, 2008, at 8:07 PM, Rakesh Singhal <rakesh.singhal(a)gmail.com> wrote: On Mon, Dec 1, 2008 at 9:16 AM, Luke Hiesterman <luketheh(a)apple.com> wrote: If you use the same path and same id for ftok on both processes then you will get the same key for use with semget. This is precisely the purpose of ftok. On Nov 30, 2008, at 7:15 PM, Rakesh Singhal <rakesh.singhal(a)gmail.com> wrote: Thanks. The problem I have to give file path to generate key. How will I ensure that the path I am giving will work always to generate the same key? I have one application and another is dynamic library and I want to generate the same key in both to use. On Mon, Dec 1, 2008 at 12:56 AM, Luke Hiesterman <luketheh(a)apple.com> wrote: Why exactly do you want to avoid ftok? It's a good way to generate shared keys. It's always possible to generate an integer key some other way yourself and then you just have to figure out how to communicate it across processes. You could write it to a file or send it over a socket. On Nov 30, 2008, at 3:25 AM, Rakesh Singhal <rakesh.singhal(a)gmail.com > wrote: On Thu, Nov 27, 2008 at 9:49 AM, Terry Lambert <tlambert(a)apple.com > wrote: On Nov 26, 2008, at 7:31 PM, Rakesh Singhal wrote: 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). This email sent to site_archiver(a)lists.apple.com

1 0

Re: Semaphore
by Rakesh Singhal 01 Dec '08

01 Dec '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=hoRW+A9QOT9Ooh367JlI5IyPjQUX//164iOon0HDv9M=; b=MtSnbFudqtsitSLOGdklxLzmovsqlQTSUEyIQ1IVe5x3RMxDrCz9ubjOZTb6YiR6be X6GcfZuhqivfEECoAhVhBTNR28eknu2GldioIOOYknXgLHq95FVj9Rk8sDBE+TjZ8h8n 05pAWgxmidyqUKhISZq+hdHfpRgJCSIBgjcQ8= 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=Bi3ucBDqJkPpMILue732RqDER/UjH/9lhWq2wLYWKJjCXwBJv9O5xlbG1Ts5e1pjQc bB64SMtjVrJvjJ6ZAstON2QspO1cnHtITY0LXu2vLCZfGVzpzbQLLnJ5dJmeqFxam0oW 2trWvsTxBN+SIB0ex9RNOS773DNxxNv2B271k= Yes that is my query what path to choose to make sure that it would generate same key in both dylib and app. regards On Mon, Dec 1, 2008 at 9:16 AM, Luke Hiesterman <luketheh(a)apple.com> wrote: > If you use the same path and same id for ftok on both processes then you > will get the same key for use with semget. This is precisely the purpose of > ftok. > > Luke > > Sent from my iPhone. > > On Nov 30, 2008, at 7:15 PM, Rakesh Singhal <rakesh.singhal(a)gmail.com> > wrote: > >> Thanks. The problem I have to give file path to generate key. How will >> I ensure that the path I am giving will work always to generate the >> same key? I have one application and another is dynamic library and I >> want to generate the same key in both to use. >> >> Regards >> rksinghal >> >> >> On Mon, Dec 1, 2008 at 12:56 AM, Luke Hiesterman <luketheh(a)apple.com> >> wrote: >>> >>> Why exactly do you want to avoid ftok? It's a good way to generate shared >>> keys. >>> >>> It's always possible to generate an integer key some other way yourself >>> and >>> then you just have to figure out how to communicate it across processes. >>> You >>> could write it to a file or send it over a socket. >>> >>> Luke >>> >>> Sent from my iPhone. >>> >>> On Nov 30, 2008, at 3:25 AM, Rakesh Singhal <rakesh.singhal(a)gmail.com> >>> wrote: >>> >>>> Is it possible to use semget() without using ftok() for IPC >>>> communication? >>>> >>>> Please suggest me. >>>> >>>> Regards >>>> rksinghal >>>> >>>> On Fri, Nov 28, 2008 at 9:54 AM, Rakesh Singhal >>>> <rakesh.singhal(a)gmail.com> wrote: >>>>> >>>>> Thanks. Now I am using following set of APIs: >>>>> >>>>> ftok() >>>>> semget() >>>>> semop() >>>>> semctl() >>>>> >>>>> It is working till now :) >>>>> >>>>> Regards >>>>> rksinghal >>>>> >>>>> On Thu, Nov 27, 2008 at 9:49 AM, Terry Lambert <tlambert(a)apple.com> >>>>> wrote: >>>>>> >>>>>> On Nov 26, 2008, at 7:31 PM, Rakesh Singhal wrote: >>>>>>> >>>>>>> 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). >>>>>> >>>>>> POSIX unnamed semaphores are not supported. >>>>>> >>>>>> Use either POSIX named semaphores, or use System V semaphores: >>>>>> >>>>>> man sem_open >>>>>> man semget >>>>>> >>>>>> -- 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

1 0

Re: Semaphore
by Luke Hiesterman 01 Dec '08

01 Dec '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Luke Sent from my iPhone. Thanks. The problem I have to give file path to generate key. How will I ensure that the path I am giving will work always to generate the same key? I have one application and another is dynamic library and I want to generate the same key in both to use. Regards rksinghal Luke Sent from my iPhone. Please suggest me. Regards rksinghal On Fri, Nov 28, 2008 at 9:54 AM, Rakesh Singhal <rakesh.singhal(a)gmail.com> wrote: Thanks. Now I am using following set of APIs: ftok() semget() semop() semctl() It is working till now :) Regards rksinghal On Thu, Nov 27, 2008 at 9:49 AM, Terry Lambert <tlambert(a)apple.com> wrote: Hi all POSIX unnamed semaphores are not supported. Use either POSIX named semaphores, or use System V semaphores: man sem_open man semget -- 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… If you use the same path and same id for ftok on both processes then you will get the same key for use with semget. This is precisely the purpose of ftok. On Nov 30, 2008, at 7:15 PM, Rakesh Singhal <rakesh.singhal(a)gmail.com> wrote: On Mon, Dec 1, 2008 at 12:56 AM, Luke Hiesterman <luketheh(a)apple.com> wrote: Why exactly do you want to avoid ftok? It's a good way to generate shared keys. It's always possible to generate an integer key some other way yourself and then you just have to figure out how to communicate it across processes. You could write it to a file or send it over a socket. On Nov 30, 2008, at 3:25 AM, Rakesh Singhal <rakesh.singhal(a)gmail.com> wrote: Is it possible to use semget() without using ftok() for IPC communication? On Nov 26, 2008, at 7:31 PM, Rakesh Singhal wrote: 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). This email sent to site_archiver(a)lists.apple.com

1 0

Re: Semaphore
by Rakesh Singhal 01 Dec '08

01 Dec '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=JZOoi2ct5cBP+QdUtoznkUeRymbwDAYcI9G/U+wf67o=; b=Mq6/hcgo3U2r9m1oyBEcPFHusuWBtUBLoJ7nBNhwlD+eRrugrdQYsnH/vvyW79z/Zz 43KlKVAugtTRDuAA/zpGQOszp6Q0Xu+7ciAwvatun60jBSE48+YHcOO9mQMLNy26U+o0 Txq0mPYQiFmHXZX6eBD4GQHPwBa7Anw7o21Vs= 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=hSHVi4ewqmmusFHryJw3L4SvPyZ8yZ0RkIM4/FdjXZSZ2BHt4eoE1ZuMO/eCTuv92J 64W4JmkosXQKM0uG3fI7yyElbGRboHcSfkghSNgW9j9vzH78eDla9ehmR+DLGW6gW/vv Mo7S1a5/tDh2otdoVnL3NS+XXbhnlzVftekXA= Thanks. The problem I have to give file path to generate key. How will I ensure that the path I am giving will work always to generate the same key? I have one application and another is dynamic library and I want to generate the same key in both to use. Regards rksinghal On Mon, Dec 1, 2008 at 12:56 AM, Luke Hiesterman <luketheh(a)apple.com> wrote: > Why exactly do you want to avoid ftok? It's a good way to generate shared > keys. > > It's always possible to generate an integer key some other way yourself and > then you just have to figure out how to communicate it across processes. You > could write it to a file or send it over a socket. > > Luke > > Sent from my iPhone. > > On Nov 30, 2008, at 3:25 AM, Rakesh Singhal <rakesh.singhal(a)gmail.com> > wrote: > >> Is it possible to use semget() without using ftok() for IPC communication? >> >> Please suggest me. >> >> Regards >> rksinghal >> >> On Fri, Nov 28, 2008 at 9:54 AM, Rakesh Singhal >> <rakesh.singhal(a)gmail.com> wrote: >>> >>> Thanks. Now I am using following set of APIs: >>> >>> ftok() >>> semget() >>> semop() >>> semctl() >>> >>> It is working till now :) >>> >>> Regards >>> rksinghal >>> >>> On Thu, Nov 27, 2008 at 9:49 AM, Terry Lambert <tlambert(a)apple.com> >>> wrote: >>>> >>>> On Nov 26, 2008, at 7:31 PM, Rakesh Singhal wrote: >>>>> >>>>> 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). >>>> >>>> POSIX unnamed semaphores are not supported. >>>> >>>> Use either POSIX named semaphores, or use System V semaphores: >>>> >>>> man sem_open >>>> man semget >>>> >>>> -- 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

1 0