git subrepo clone (merge) --branch=v3.6.1 https://github.com/nats-io/nats.c.git deps/nats.c

subrepo:
  subdir:   "deps/nats.c"
  merged:   "66cec7f"
upstream:
  origin:   "https://github.com/nats-io/nats.c.git"
  branch:   "v3.6.1"
  commit:   "66cec7f"
git-subrepo:
  version:  "0.4.6"
  commit:   "b8b46501e"

deps/nats.c/examples/libuv-pub.c

@@ -0,0 +1,135 @@
+// Copyright 2016-2018 The NATS Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "adapters/libuv.h"
+#include "examples.h"
+
+static const char *usage = ""\
+"-txt           text to send (default is 'hello')\n" \
+"-count         number of messages to send\n";
+
+typedef struct
+{
+    natsConnection  *conn;
+    natsStatus      status;
+
+} threadInfo;
+
+static void
+pubThread(void *arg)
+{
+    threadInfo  *info = (threadInfo*) arg;
+    natsStatus  s     = NATS_OK;
+
+    for (count = 0; (s == NATS_OK) && (count < total); count++)
+        s = natsConnection_PublishString(info->conn, subj, payload);
+
+    if (s == NATS_OK)
+        s = natsConnection_Flush(info->conn);
+
+    natsConnection_Close(info->conn);
+
+    info->status = s;
+
+    // Since this is a user-thread, call this function to release
+    // possible thread-local memory allocated by the library.
+    nats_ReleaseThreadMemory();
+}
+
+int main(int argc, char **argv)
+{
+    natsConnection      *conn  = NULL;
+    natsOptions         *opts  = NULL;
+    natsSubscription    *sub   = NULL;
+    natsStatus          s      = NATS_OK;
+    uv_loop_t           *uvLoop= NULL;
+    uv_thread_t         pub;
+    threadInfo          info;
+
+    opts = parseArgs(argc, argv, usage);
+
+    printf("Sending %" PRId64 " messages to subject '%s'\n", total, subj);
+
+    // One time initialization of things that we need.
+    natsLibuv_Init();
+
+    // Create a loop.
+    uvLoop = uv_default_loop();
+    if (uvLoop != NULL)
+    {
+        // Libuv is not thread-safe. Almost all calls to libuv need to
+        // occur from the thread where the loop is running. NATS library
+        // may have to call into the event loop from different threads.
+        // This call allows natsLibuv APIs to know if they are executing
+        // from the event loop thread or not.
+        natsLibuv_SetThreadLocalLoop(uvLoop);
+    }
+    else
+    {
+        s = NATS_ERR;
+    }
+
+    // Indicate which loop and callbacks to use once connected.
+    if (s == NATS_OK)
+        s = natsOptions_SetEventLoop(opts, (void*) uvLoop,
+                                     natsLibuv_Attach,
+                                     natsLibuv_Read,
+                                     natsLibuv_Write,
+                                     natsLibuv_Detach);
+
+    if (s == NATS_OK)
+        s = natsConnection_Connect(&conn, opts);
+
+    if (s == NATS_OK)
+        start = nats_Now();
+
+    if (s == NATS_OK)
+    {
+        info.conn   = conn;
+        info.status = NATS_OK;
+
+        if (uv_thread_create(&pub, pubThread, (void*) &info) != 0)
+            s = NATS_ERR;
+    }
+
+    if (s == NATS_OK)
+    {
+        uv_run(uvLoop, UV_RUN_DEFAULT);
+
+        uv_thread_join(&pub);
+        s = info.status;
+    }
+
+    if (s == NATS_OK)
+    {
+        printPerf("Sent");
+    }
+    else
+    {
+        printf("Error: %d - %s\n", s, natsStatus_GetText(s));
+        nats_PrintLastErrorStack(stderr);
+    }
+
+    // Destroy all our objects to avoid report of memory leak
+    natsSubscription_Destroy(sub);
+    natsConnection_Destroy(conn);
+    natsOptions_Destroy(opts);
+
+    if (uvLoop != NULL)
+        uv_loop_close(uvLoop);
+
+    // To silence reports of memory still in used with valgrind
+    nats_Close();
+
+    return 0;
+}