WebSVN – HelenOS – Diff – /branches/dynload/uspace/srv/ns/ns.c

  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 /** @addtogroup ns
  * @{
  */
 /**
- * @file    ns.c
+ * @file  ns.c
- * @brief   Naming service for HelenOS IPC.
+ * @brief Naming service for HelenOS IPC.
  */
 #include <ipc/ipc.h>
 #include <ipc/ns.h>
 #include <sysinfo.h>
 #include <loader/loader.h>
 #include <ddi.h>
 #include <as.h>
-#define NAME    "ns"
+#define NAME  "ns"
-#define NS_HASH_TABLE_CHAINS    20
+#define NS_HASH_TABLE_CHAINS  20
 static int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call);
-static int connect_to_service(ipcarg_t service, ipc_call_t *call,
+static void connect_to_service(ipcarg_t service, ipc_call_t *call,
     ipc_callid_t callid);
 void register_clonable(ipcarg_t service, ipcarg_t phone, ipc_call_t *call,
     ipc_callid_t callid);
 void connect_to_clonable(ipcarg_t service, ipc_call_t *call,
     ipc_callid_t callid);
 /* Static functions implementing NS hash table operations. */
 static hash_index_t ns_hash(unsigned long *key);
 static int ns_compare(unsigned long *key, hash_count_t keys, link_t *item);
 static void ns_remove(link_t *item);
 static hash_table_t ns_hash_table;
 /** NS hash table item. */
 typedef struct {
     link_t link;
-    ipcarg_t service;       /**< Number of the service. */
+    ipcarg_t service;        /**< Number of the service. */
-    ipcarg_t phone;         /**< Phone registered with the service. */
+    ipcarg_t phone;          /**< Phone registered with the service. */
-    ipcarg_t in_phone_hash;     /**< Incoming phone hash. */
+    ipcarg_t in_phone_hash;  /**< Incoming phone hash. */
 } hashed_service_t;
-static void *clockaddr = NULL;
+/** Pending connection structure. */
+typedef struct {
+    link_t link;
+    ipcarg_t service;        /**< Number of the service. */
+    ipc_callid_t callid;     /**< Call ID waiting for the connection */
+    ipcarg_t arg2;           /**< Second argument */
+    ipcarg_t arg3;           /**< Third argument */
+} pending_req_t;
-static void *klogaddr = NULL;
+static link_t pending_req;
 /** Request for connection to a clonable service. */
 typedef struct {
     link_t link;
     ipcarg_t service;
 } cs_req_t;
 /** List of clonable-service connection requests. */
 static link_t cs_req;
+static void *clockaddr = NULL;
+static void *klogaddr = NULL;
 /** Return true if @a service is clonable. */
 static bool service_clonable(int service)
+{
-    return service == SERVICE_LOAD;
+    return (service == SERVICE_LOAD);
+}
 static void get_as_area(ipc_callid_t callid, ipc_call_t *call, char *name, void **addr)
+{
     void *ph_addr;
+        }
+    }
     ipc_answer_2(callid, EOK, (ipcarg_t) *addr, AS_AREA_READ);
+}
+/** Process pending connection requests */
+static void process_pending_req()
+{
+    link_t *cur;
+loop:
+    for (cur = pending_req.next; cur != &pending_req; cur = cur->next) {
+        pending_req_t *pr = list_get_instance(cur, pending_req_t, link);
+        unsigned long keys[3] = {
+            pr->service,
+,
+        };
+        link_t *link = hash_table_find(&ns_hash_table, keys);
+        if (!link)
+            continue;
+        hashed_service_t *hs = hash_table_get_instance(link, hashed_service_t, link);
+        ipcarg_t retval = ipc_forward_fast(pr->callid, hs->phone,
+            pr->arg2, pr->arg3, 0, IPC_FF_NONE);
+        if (!(pr->callid & IPC_CALLID_NOTIFICATION))
+            ipc_answer_0(pr->callid, retval);
+        list_remove(cur);
+        free(pr);
+        goto loop;
+    }
+}
 int main(int argc, char **argv)
+{
     printf(NAME ": HelenOS IPC Naming Service\n");
-    ipc_call_t call;
-    ipc_callid_t callid;
-    ipcarg_t retval;
     if (!hash_table_create(&ns_hash_table, NS_HASH_TABLE_CHAINS, 3,
         &ns_hash_table_ops)) {
-        printf(NAME ": No memory available\n");
+        printf(NAME ": No memory available for services\n");
         return ENOMEM;
+    }
+    list_initialize(&pending_req);
     list_initialize(&cs_req);
     printf(NAME ": Accepting connections\n");
-    while (1) {
+    while (true) {
+        process_pending_req();
+        ipc_call_t call;
-        callid = ipc_wait_for_call(&call);
+        ipc_callid_t callid = ipc_wait_for_call(&call);
+        ipcarg_t retval;
         switch (IPC_GET_METHOD(call)) {
         case IPC_M_SHARE_IN:
             switch (IPC_GET_ARG3(call)) {
             case SERVICE_MEM_REALTIME:
                 get_as_area(callid, &call, "clock.faddr", &clockaddr);
             if (service_clonable(IPC_GET_ARG1(call))) {
                 connect_to_clonable(IPC_GET_ARG1(call),
                     &call, callid);
                 continue;
             } else {
-                retval = connect_to_service(IPC_GET_ARG1(call),
+                connect_to_service(IPC_GET_ARG1(call), &call,
-                    &call, callid);
+                    callid);
+                continue;
+            }
             break;
         default:
             retval = ENOENT;
             break;
+        }
-        if (!(callid & IPC_CALLID_NOTIFICATION)) {
+        if (!(callid & IPC_CALLID_NOTIFICATION))
             ipc_answer_0(callid, retval);
-        }
+    }
     /* Not reached */
     return 0;
+}
 /** Register service.
+ *
- * @param service   Service to be registered.
+ * @param service Service to be registered.
- * @param phone     Phone to be used for connections to the service.
+ * @param phone   Phone to be used for connections to the service.
- * @param call      Pointer to call structure.
+ * @param call    Pointer to call structure.
+ *
+ * @return Zero on success or a value from @ref errno.h.
+ *
- * @return      Zero on success or a value from @ref errno.h.
  */
 int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call)
+{
     unsigned long keys[3] = {
         service,
         call->in_phone_hash,
     };
-    hashed_service_t *hs;
-    if (hash_table_find(&ns_hash_table, keys)) {
+    if (hash_table_find(&ns_hash_table, keys))
         return EEXISTS;
-    }
-    hs = (hashed_service_t *) malloc(sizeof(hashed_service_t));
+    hashed_service_t *hs = (hashed_service_t *) malloc(sizeof(hashed_service_t));
-    if (!hs) {
+    if (!hs)
         return ENOMEM;
-    }
     link_initialize(&hs->link);
     hs->service = service;
     hs->phone = phone;
     hs->in_phone_hash = call->in_phone_hash;
     hash_table_insert(&ns_hash_table, keys, &hs->link);
     return 0;
+}
 /** Connect client to service.
+ *
- * @param service   Service to be connected to.
+ * @param service Service to be connected to.
- * @param call      Pointer to call structure.
+ * @param call    Pointer to call structure.
- * @param callid    Call ID of the request.
+ * @param callid  Call ID of the request.
+ *
  * @return Zero on success or a value from @ref errno.h.
+ *
  */
-int connect_to_service(ipcarg_t service, ipc_call_t *call, ipc_callid_t callid)
+void connect_to_service(ipcarg_t service, ipc_call_t *call, ipc_callid_t callid)
+{
+    ipcarg_t retval;
-    unsigned long keys[3] = { service, 0, 0 };
+    unsigned long keys[3] = {
-    link_t *hlp;
+        service,
+,
-    hashed_service_t *hs;
+    };
-    hlp = hash_table_find(&ns_hash_table, keys);
+    link_t *link = hash_table_find(&ns_hash_table, keys);
-    if (!hlp) {
+    if (!link) {
+        if (IPC_GET_ARG4(*call) & IPC_FLAG_BLOCKING) {
+            /* Blocking connection, add to pending list */
+            pending_req_t *pr = (pending_req_t *) malloc(sizeof(pending_req_t));
+            if (!pr) {
+                retval = ENOMEM;
+                goto out;
+            }
+            pr->service = service;
+            pr->callid = callid;
+            pr->arg2 = IPC_GET_ARG2(*call);
+            pr->arg3 = IPC_GET_ARG3(*call);
+            list_append(&pr->link, &pending_req);
+            return;
+        }
-        return ENOENT;
+        retval = ENOENT;
+        goto out;
+    }
-    hs = hash_table_get_instance(hlp, hashed_service_t, link);
+    hashed_service_t *hs = hash_table_get_instance(link, hashed_service_t, link);
-    return ipc_forward_fast(callid, hs->phone, IPC_GET_ARG2(*call),
+    retval = ipc_forward_fast(callid, hs->phone, IPC_GET_ARG2(*call),
         IPC_GET_ARG3(*call), 0, IPC_FF_NONE);
+out:
+    if (!(callid & IPC_CALLID_NOTIFICATION))
+        ipc_answer_0(callid, retval);
+}
 /** Register clonable service.
+ *
- * @param service   Service to be registered.
+ * @param service Service to be registered.
- * @param phone     Phone to be used for connections to the service.
+ * @param phone   Phone to be used for connections to the service.
- * @param call      Pointer to call structure.
+ * @param call    Pointer to call structure.
+ *
  */
 void register_clonable(ipcarg_t service, ipcarg_t phone, ipc_call_t *call,
     ipc_callid_t callid)
+{
-    int rc;
-    cs_req_t *csr;
     if (list_empty(&cs_req)) {
         /* There was no pending connection request. */
         printf(NAME ": Unexpected clonable server.\n");
         ipc_answer_0(callid, EBUSY);
         return;
+    }
-    csr = list_get_instance(cs_req.next, cs_req_t, link);
+    cs_req_t *csr = list_get_instance(cs_req.next, cs_req_t, link);
     list_remove(&csr->link);
     /* Currently we can only handle a single type of clonable service. */
     assert(csr->service == SERVICE_LOAD);
     ipc_answer_0(callid, EOK);
-    rc = ipc_forward_fast(csr->callid, phone, IPC_GET_ARG2(csr->call),
+    int rc = ipc_forward_fast(csr->callid, phone, IPC_GET_ARG2(csr->call),
         IPC_GET_ARG3(csr->call), 0, IPC_FF_NONE);
     free(csr);
+}
 /** Connect client to clonable service.
+ *
- * @param service   Service to be connected to.
+ * @param service Service to be connected to.
- * @param call      Pointer to call structure.
+ * @param call    Pointer to call structure.
- * @param callid    Call ID of the request.
+ * @param callid  Call ID of the request.
+ *
+ * @return Zero on success or a value from @ref errno.h.
+ *
- * @return      Zero on success or a value from @ref errno.h.
  */
 void connect_to_clonable(ipcarg_t service, ipc_call_t *call,
     ipc_callid_t callid)
+{
-    int rc;
-    cs_req_t *csr;
     assert(service == SERVICE_LOAD);
-    csr = malloc(sizeof(cs_req_t));
+    cs_req_t *csr = malloc(sizeof(cs_req_t));
     if (csr == NULL) {
         ipc_answer_0(callid, ENOMEM);
         return;
+    }
     /* Spawn a loader. */
-    rc = loader_spawn("loader");
+    int rc = loader_spawn("loader");
     if (rc < 0) {
         free(csr);
         ipc_answer_0(callid, rc);
         return;
+    }
     csr->service = service;
     csr->call = *call;
     csr->callid = callid;
     /*
      * We can forward the call only after the server we spawned connects
      * to us. Meanwhile we might need to service more connection requests.
      * Thus we store the call in a queue.
      */
+}
 /** Compute hash index into NS hash table.
+ *
  * @param key Pointer keys. However, only the first key (i.e. service number)
- *        is used to compute the hash index.
+ *            is used to compute the hash index.
+ *
  * @return Hash index corresponding to key[0].
+ *
  */
 hash_index_t ns_hash(unsigned long *key)
+{
     assert(key);
-    return *key % NS_HASH_TABLE_CHAINS;
+    return (*key % NS_HASH_TABLE_CHAINS);
+}
 /** Compare a key with hashed item.
+ *
  * This compare function always ignores the third key.
  * It exists only to make it possible to remove records
  * originating from connection with key[1] in_phone_hash
  * value. Note that this is close to being classified
  * as a nasty hack.
+ *
- * @param key Array of keys.
+ * @param key  Array of keys.
  * @param keys Must be lesser or equal to 3.
  * @param item Pointer to a hash table item.
+ *
  * @return Non-zero if the key matches the item, zero otherwise.
+ *
  */
 int ns_compare(unsigned long key[], hash_count_t keys, link_t *item)
+{
-    hashed_service_t *hs;
     assert(key);
     assert(keys <= 3);
     assert(item);
-    hs = hash_table_get_instance(item, hashed_service_t, link);
+    hashed_service_t *hs = hash_table_get_instance(item, hashed_service_t, link);
     if (keys == 2)
         return key[1] == hs->in_phone_hash;
     else
         return key[0] == hs->service;
+}
 /** Perform actions after removal of item from the hash table.
+ *
  * @param item Item that was removed from the hash table.
+ *
  */
 void ns_remove(link_t *item)
+{
     assert(item);
     free(hash_table_get_instance(item, hashed_service_t, link));
+}
 /**
  * @}
  */

Subversion Repositories HelenOS

(root)/branches/dynload/uspace/srv/ns/ns.c – Rev 4343 → 4345