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charset="us-ascii" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.15 Subject: [dpdk-dev] Importing DATA into the application X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions <dev.dpdk.org> List-Unsubscribe: <https://mails.dpdk.org/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://mails.dpdk.org/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <https://mails.dpdk.org/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> Errors-To: dev-bounces@dpdk.org Sender: "dev" <dev-bounces@dpdk.org> Hi, While using the DPDK libs as DLLs, I've ran into some access violation erro= rs. I believe they are caused by some incorrect imports. In Windows, accessing an imported variable is done either by using __declsp= ec(dllimport), or by using an extra level of indirection[1]. Some examples of variables in DPDK that are not declared correctly: rte_cycles.h: extern void (*rte_delay_us)(unsigned int us); rte_mempool.h: extern struct rte_mempool_ops_table rte_mempool_ops_table; rte_lcore.h: RTE_DECLARE_PER_LCORE(unsigned, _lcore_id); (Which expands to = extern __thread unsigned per_lcore__lcore_id) To fix this, we need to add the __declspec(dllimport) keyword to the declar= ations of these symbols. Also, we need to consider that the symbols can be = used both internally(in the same module) and externally (imported by other = modules). We can define a macro that will tell if the symbol is used internally or is= imported by a different DLL. Example: #ifdef RTE_INTERNAL extern void (*rte_delay_us)(unsigned int us); #else __declspec(dllimport) void (*rte_delay_us)(unsigned int us); #endif We can then hide the Windows-specific keywords under a new macro, such as: #define RTE_IMPORT __declspec(dllimport) However, there are a few issues to consider: * We cannot add __declspec(dllimport) when declaring per_lcore__lcore_id f= or example. We cannot have both __thread and __declspec(dllimport) (can't = import thread local variables). Have you discussed/run into these issues before? Let me know what you think= . Thanks, Naty [1] https://docs.microsoft.com/en-us/cpp/build/importing-using-def-files?vi= ew=3Dmsvc-160