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Comments:
<0> it's bad design to create threads from a dll
<1> i need it to improve performance of an app
<0> but you can use something like WaitForSingleObject/WaitForMultipleObjects and wait for the thread handle to signal
<0> and then execute code
<0> there is DLL_THREAD_DETACH in DLLMAIn
<0> but it's easy to cause deadlocks by putting code there
<1> does DLLMain run in the same addr space as the process that is loading/unloading it ?
<0> of course
<1> its seems like it spawns an extra thread just for DLLMain
<1> when its loaded/unloaded
<1> and if i want to create an extra thread in DLLMain my program hangs, because its wating for DLLMain to finish
<1> and DLLMain does not finish because it spawned a new thread
<0> you can
<0> yyou can't do that in dll main
<1> well currently i have an exported function Initialize/Destroy to spawn/destroy extra threads
<0> that is correct
<1> and i need to make sure that when dll is unloaded Destroy is called automatically
<0> right
<1> i am trying to make a singleton object
<0> or you can make sure it doesn't get unloaded while the extra threads are running
<1> that auto-intializes and auto-destroys on load/unload
<1> hm
<0> there's a refcount maintained to see if a dll can be unloaded
<0> so you need to bump it up for every extra thread spawned
<0> and then release it before a thread exits
<0> then the dll will not be unloaded while the extra threads are running
<0> but like I said, it seems like a bad design
<1> whats wrong with having singletons in dll
<1> if you want to sup up sound in your application
<0> 1) singletons are usually a bad design
<1> wouldn't it be nice to have a dll that will create a sound server and all you have to do is control it via exported functions
<0> 2) dlls are not good candidates for a singleton
<0> and you can't make it an exe ?
<1> hmm
<1> well my other choice is to make an exe
<0> make it and exe then
<1> and make a dll that will talk to exe via some process to process communication
<0> you can use COM maybe
<1> i have an app that allows dll extensions
<1> so i need to use a dll
<0> can you make an COM exe server ( singleton) and call it from the extension dll
<1> hmm
<1> do you have some functions that i can look at to learn more on how it works ?
<0> google for ATL
<1> what does it stand for ?
<0> active template library
<1> wow, neat
<2> .. or maybe u need something more like a service
<0> CLoud: is this for school?
<1> no, its a hobby
<1> trying to sup up an application
<0> do you need a singleton in the context of a single process?
<1> yeah
<1> well
<1> it could be in another process
<1> but there has to be some way to communicate with it via dll functions
<0> COM
<0> from extension
<0> or make it a dll, and dance around all the multithreading issues there
<3> HEy guys, I need some help starting a project, what's the easyest way to
<3> create a board to the console of a board,9x9 then be able to keep track
<3> of each sqare.... just need some help starting that so i can do the rest
<3> any suggestions.... and it's in c++
<1> c_help : what system are you running on ?
<1> i knew Com would come back and bite me in the *** someday
<0> lol
<1> i tried to avoid it as much as possible
<3> unix console
<0> Cloud: why do you need multithreading again ?
<1> the exported functions use SDL library that needs a worker thread
<1> so when i call Initialize a new thread is spawned
<3> cloud_99: i'm on windows, but using a AIX compiler
<0> Cloud99: and what is the problem?
<1> when the app closes a window it kill one of the main threads and crashes
<1> this does not happen if you somehow call SLD_Quit procedure before exit
<1> i can't do it in DLL_main and can't do it in the app, unless i manually call it
<1> the app is a telnet program
<1> i have to manually type /calldll this.dll command
<1> btw
<1> do you know any good books on COM ?
<1> might as well learn it
<0> the extension dll must be notified from the main app on exit, no ?
<1> it is not, the only exit that i can detect is through DLLMain
<1> but that does not help
<0> it ****s that the main app doesn't notify the extension of a shut-down properly..
<0> sounds like a design flaw
<1> well the whole extension thing was designed only to perform text processing and return back a result
<0> usually extensions export a shut-down function of some sort
<1> i am abusing it
<1> its like taking a small toyota and turning it into a pick up track
<1> err truck
<0> you'll have to hack it
<1> do you work with COM a lot ?
<0> I do somewhat
<1> whats good about it ?
<0> it's a prepackaged solution for solving some problems
<0> no need to reinvent the wheel
<0> Do you need to call SLD_Quit ( I ***ume a 3rd party lib?)
<1> yeah
<1> there is one small hack
<1> when dll is loaded
<1> the app calls an init function on its own
<1> i am thinking of putting atexit there
<0> do you control application code at all?
<1> not really
<1> all i can do is type something in it and it will call a function in dll with parameters
<0> it's a bad design of the extension interface
<0> there should be some init() and Uninit() exported and called by main app
<0> which is where you'd do the work to create 3rd party stuff, and then shut it down/cleanup
<0> actually, COM won't help you in this situation
<0> by the time you know you need to clean up, it's too late to do anything, because you're under a loader lock
<0> so find a way to get notified from main app
<0> before the unload happens
<2> I just post some question uin chanel C#, no one is answering ... appreciate itif anyone can help me there
<4> C# is closer to Java than it is to C++
<5> what's the difference between a float and a double?
<6> float is double precision float
<6> err
<6> double is a double precision float
<7> Is double the most precise you can get?
<6> using primitive variable types, yes
<6> it is possible to get arbitrary precision, but it will be much slower and unless you're doing extremely accurate scientific modeling it's pretty much a waste
<4> there is long double, too
<4> and though it's not part of C++, some compilers (like g++) will let you use special flags to make them larger (and more precise)
<2> damn... I have devenv.exe in the Windows Task Manager Process tab that cannot be terminated... any idea how to kill it?
<8> hi ]
<8> im trying to use a cl*** in my program , i created a cl*** but when i compile i receive this
<8> Linking...
<8> LIBCD.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
<8> Debug/project1.exe : fatal error LNK1120: 1 unresolved externals
<8> Error executing link.exe.
<9> did you have a main()?
<4> and did you put main() in the cl***?
<8> no
<4> (that would be bad)
<8> i didnt put a main in the cl***
<9> do you have a main() at all?
<8> i dont have a main at all
<8> what means this error
<9> georgesUHF: it means it's looking for a main() to link to and can't find one
<8> what i have to do ?
<10> add a main()
<8> where ? in a cpp file for ex ?
<9> sure
<8> i did
<9> you said you didn't....
<10> lol
<8> now i added after u told me
<10> main = entry point of your program
<8> yes
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