Re: Semaphore
Re: Semaphore
- Subject: Re: Semaphore
- From: Jean-Daniel Dupas <email@hidden>
- Date: Mon, 8 Dec 2008 14:19:13 +0100
Disable ZeroLink in your build settings.
You should never deploy a zero linked binary, and zero link no longer
exists on 10.5 (and nobody misses it IMHO).
http://developer.apple.com/qa/qa2001/qa1322.html
Le 8 déc. 08 à 13:23, Rakesh Singhal a écrit :
I have put 2 dynamic libraries in /usr/lib/ folder and trying to use
them using dlopen API. It is working fine with PPC 10.4.9 but I am
trying now on 10.5.4 Intel. I do knot know what is happening. It
shows:
dyld: Library not loaded:
/Developer/Library/PrivateFrameworks/ZeroLink.framework/Versions/A/
ZeroLink
Referenced from: /myProject/myApp
Reason: image not found
Trace/BPT trap
Please suggest me.
Thanks in advance.
Regards
rksinghal
On Mon, Dec 1, 2008 at 10:11 AM, Rakesh Singhal
<email@hidden> wrote:
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
<email@hidden> 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 <email@hidden
>
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
<email@hidden>
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 <email@hidden
>
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 <email@hidden
>
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 <email@hidden
>
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
<email@hidden> 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 <email@hidden
>
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
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