I'm using a C library that allocates some opaque structure, and returns a pointer to it. I'd like to save that pointer in a safe process-wide place, generate my own unique integer key (easy), and then return that simple key as a handle to my Tcl code. I also need to be able to find and use the C pointer from multiple threads.
In the past I've done that sort of thing with my own Tcl_HashTable in C, but those are a bit low level, not that friendly to deal with. I'd rather use nsv_set, nsv_get, etc.! And I already know how to call NsTclNsvGetObjCmd() etc. from C. But the Nsv functions all operate ONLY on strings... I suppose I should be able to (very carefully) convert my pointer value to a string and back each time, but that seems awfully kludgy. Is there a better way? Something that lets me store the binary pointer values as is, without string conversions? The Tcl_HashTable C code DOES let me do that. In general, what's the recommended way for Tcl and/or NaviServer programmers to allocate handles to C-level pointers, and then access those handles and pointers from more than one Tcl thread? Can anyone point me to examples of code doing it the right way? Is Tcl_HashTable the right tool to use, or is some nicer Nsv-like interface available? (Nsv itself is implemented using Tcl_HashTable, of course.) Does Zoran's Thread tsv package have any additional functionality to help with this, beyond what NaviServer's built-in nsv commands can do? I found these wiki pages, but these (handles as values) approaches seem to basically just be fancier versions of what I've done before with Tcl_HashTable entries, and don't address use from multiple threads at all: https://wiki.tcl-lang.org/page/Tcl+Handles https://wiki.tcl-lang.org/page/Creating+and+Using+Tcl+Handles+in+C+Extensions (Thanks in advance for your help and advice!) -- Andrew Piskorski <a...@piskorski.com> _______________________________________________ naviserver-devel mailing list naviserver-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/naviserver-devel
