On 25.02.2014 11:20, jonat...@mugginsoft.com wrote:
I box my numeric primitives using a macro:#define DB_BOX_INT64( x ) ( mono_value_box(mono_domain_get(), mono_get_int64_class(), &x) ) And use it like so: 1. - (void)box { MonoObject *monoObject = DB_BOX_INT64(value); } I save the MonoObject * into a local variable. The collector will see the object on the stack and collect it only when the enclosing function completes. 2. - (void)box:(long long)value { self.monoObject = DB_BOX_INT64(value); self.gcHandle = mono_gchandle_new(self.monoObject, FALSE); } - (void)dealloc { mono_gchandle_free(self.gcHandle); } I save the MonoObject * into an instance variable. The collector will free the MonoObject after the call to mono_gchandle_free(). Is the above correct?
Not quite. Look at this line: self.monoObject = DB_BOX_INT64(value); There is a chance that the MonoObject* remains only reachable from self.monoObject. This means that it might be GCed before a handle could be taken from it. Something along these lines should be safe: MonoObject *obj = DB_BOX_INT64(value); self.gcHandle = mono_gchandle_new(obj, FALSE); self.monoObject = obj; For the paranoid: self.gcHandle = mono_gchandle_new(DB_BOX_INT64(value), FALSE); self.monoObject = mono_gchandle_get_target(self.gcHandle); :) Robert _______________________________________________ Mono-list maillist - Mono-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-list
