[Mono-dev] reloading mono domain or assemblies
Hi Lucas, you can use mono_domain_create() and mono_domain_unload() just fine from c. In fact, I suspect it's actually easier to do from native code these days. basically what you should do is: create domain set it active load your assemblies run your code when you want to reload code, unload the domain load your assemblies again run your code. I actually found similar reply from you in another discussion and I am using this solution. However, I have a problem with one of the DLLs. I cannot delete it because there are internal calls registered (mono_add_internal_call) from that DLL. I cannot delete that DLL even after unloading the domain. I don't think it is related to loading an assembly from the disk instead of memory because other DLL that does not have any method registered with mono can be deleted after unloading the domain. Do you have any idea how to solve this? Thanks. ___ Mono-devel-list mailing list Mono-devel-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-devel-list
[Mono-dev] reloading mono domain or assemblies
Hi, We are developing a game and using C# and C++ with the help of mono. There are two dlls we use; Dll1 and Dll2. At run-time, I want to change (update) these dlls without restarting the game (which takes a while). Here is the code we use: mono_domain = mono_jit_init(Dll1); mono_world_assembly = mono_domain_assembly_open(mono_domain,Dll1); mono_world_image = mono_assembly_get_image(mono_world_assembly); mono_module_assembly = mono_domain_assembly_open(mono_domain, Dll2); mono_module_image = mono_assembly_get_image(mono_module_assembly); I tried two diferent ways, but neither was successful. I don't even know what is the exact error since I don't know how to debug mono in C++. First approach was to use mono_jit_cleanup and then when the dlls are recompiled use the code above to reload the dlls. Second approach was to close the assemblies and images and reopen them when the dlls are replaced. Did I make a mistake and/or is there a way to do this? Thanks. ___ Mono-devel-list mailing list Mono-devel-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-devel-list
Re: [Mono-dev] reloading mono domain or assemblies
On 13.08.2010 15:10, marcus julius wrote: Did I make a mistake and/or is there a way to do this? Once an assembly has been JITed (which basically means that one of its methods was invoked), there is no way to change it. There are 2 ways to reload an assembly: 1) change its assembly name and load it again. Note that this will not unload/release the types provided by the previous assembly, nor are the types of the reloaded assembly compatible with those of the first one. With other words: don't do it unless you've understood these drawbacks. 2) Use app domains which can be unloaded together with their assemblies by design. This is a common pattern in the .NET word, and it can be implemented easily in managed code. There are plenty of docs/sample on the internets. Robert ___ Mono-devel-list mailing list Mono-devel-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-devel-list
[Mono-dev] reloading mono domain or assemblies
On 13.08.2010 15:10, marcus julius wrote: Did I make a mistake and/or is there a way to do this? There are 2 ways to reload an assembly: 2) Use app domains which can be unloaded together with their assemblies by design. Thanks for the quick reply. Ok, I know how to do this in C#. Is there a way to create app domain using mono in C++? If there is, I can create my monoDomain and assemblies in that app domain, so I can unload them. Otherwise, It won't help me to create an appdomain in C# since the Dlls I want to change are locked by the mono in C++. ___ Mono-devel-list mailing list Mono-devel-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-devel-list
Re: [Mono-dev] reloading mono domain or assemblies
On 13.08.2010 15:39, marcus julius wrote: On 13.08.2010 15:10, marcus julius wrote: Did I make a mistake and/or is there a way to do this? There are 2 ways to reload an assembly: 2) Use app domains which can be unloaded together with their assemblies by design. Thanks for the quick reply. Ok, I know how to do this in C#. Is there a way to create app domain using mono in C++? If there is, I can create my monoDomain and assemblies in that app domain, so I can unload them. Otherwise, It won't help me to create an appdomain in C# since the Dlls I want to change are locked by the mono in C++. Well, it doesn't really matter who's creating the domains and loading the assemblies. It's by far easier to implement this in C# and then mono_runtime_invoke it from C++. Of course, you can invoke everything from C++ but this will likely triplicate the amount of code to be written. Furthermore, the only safe way to create a domain in C++ is mono_runtime_invoke-ing System.AppDomain.CreateDomain(), IIRC. Robert ___ Mono-devel-list mailing list Mono-devel-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-devel-list
Re: [Mono-dev] reloading mono domain or assemblies
On 8/13/10 4:04 PM, Robert Jordan wrote: Well, it doesn't really matter who's creating the domains and loading the assemblies. It's by far easier to implement this in C# and then mono_runtime_invoke it from C++. Of course, you can invoke everything from C++ but this will likely triplicate the amount of code to be written. Furthermore, the only safe way to create a domain in C++ is mono_runtime_invoke-ing System.AppDomain.CreateDomain(), IIRC. you can use mono_domain_create() and mono_domain_unload() just fine from c. In fact, I suspect it's actually easier to do from native code these days. basically what you should do is: create domain set it active load your assemblies run your code when you want to reload code, unload the domain load your assemblies again run your code. It gets tricky though, as you need to somehow maintain the state of your program. We use custom serialization to remember the state of all objects, tear down everything, load new assemblies, recreate all objects, and reconfigure them the way they were. not an easy task by any means. also make sure you load your assemblies from memory instead of from disk. at least on windows, if you read them from disk, you will not be allowed to overwrite your assemblies with new ones. domain unloading/reloading is a bit of a notorious area, with plenty of memory leaks and bugs. mostly because it is a way to use mono that not that many people seem to be doing. I would say from all the mono related work I do at Unity, about 80% is related to problems relating to domain unloading. Bye, Lucas ___ Mono-devel-list mailing list Mono-devel-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-devel-list
Re: [Mono-dev] reloading mono domain or assemblies
Well you could take a look at this code (http://monobin.com/__f7469 ), should be familiar to some of you ;) For me it works perfectly under Win7 and MacOS X. -Frank ___ Mono-devel-list mailing list Mono-devel-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-devel-list
