Update pg_wait_sampling in PGPROEE10_wait_sampling up to its master

Author: Aleksandr Parfenov

contrib/pg_wait_sampling/META.json

@@ -0,0 +1,51 @@
+{
+   "name": "pg_wait_sampling",
+   "abstract": "Sampling based statistics of wait events",
+   "description": "pg_wait_sampling provides functions for detailed per backend and per query statistics about PostgreSQL wait events",
+   "version": "1.1.0",
+   "maintainer": [
+      "Alexander Korotkov <a.korotkov@postgrespro.ru>",
+      "Ildus Kurbangaliev <i.kurbangaliev@gmail.com>"
+   ],
+   "license": {
+      "PostgreSQL": "http://www.postgresql.org/about/licence"
+   },
+   "prereqs": {
+      "runtime": {
+         "requires": {
+            "PostgreSQL": "9.6.0"
+         }
+      }
+   },
+   "provides": {
+     "pg_wait_sampling": {
+       "file": "pg_wait_sampling--1.1.sql",
+       "docfile": "README.md",
+       "version": "1.1.0",
+       "abstract": "Sampling based statistics of wait events"
+     }
+   },
+   "resources": {
+      "bugtracker": {
+         "web": "https://github.com/postgrespro/pg_wait_sampling/issues"
+      },
+      "repository": {
+        "url":  "https://github.com/postgrespro/pg_wait_sampling.git",
+        "web":  "https://github.com/postgrespro/pg_wait_sampling",
+        "type": "git"
+      }
+   },
+   "generated_by": "Ildus Kurbangaliev",
+   "meta-spec": {
+      "version": "1.0.0",
+      "url": "http://pgxn.org/meta/spec.txt"
+   },
+   "tags": [
+      "waits",
+      "sampling",
+      "background worker",
+      "wait events",
+      "waits history",
+      "waits profile"
+   ]
+}

contrib/pg_wait_sampling/collector.c

@@ -38,16 +38,13 @@ register_wait_collector(void)
 	BackgroundWorker worker;
 
 	/* Set up background worker parameters */
+	memset(&worker, 0, sizeof(worker));
 	worker.bgw_flags = BGWORKER_SHMEM_ACCESS;
 	worker.bgw_start_time = BgWorkerStart_ConsistentState;
 	worker.bgw_restart_time = 0;
 	worker.bgw_notify_pid = 0;
-#if PG_VERSION_NUM >= 100000 || defined(WIN32)
-	memcpy(worker.bgw_library_name, "pg_wait_sampling", BGW_MAXLEN);
-	memcpy(worker.bgw_function_name, CppAsString(collector_main), BGW_MAXLEN);
-#else
-	worker.bgw_main = collector_main;
-#endif
+	snprintf(worker.bgw_library_name, BGW_MAXLEN, "pg_wait_sampling");
+	snprintf(worker.bgw_function_name, BGW_MAXLEN, CppAsString(collector_main));
 	snprintf(worker.bgw_name, BGW_MAXLEN, "pg_wait_sampling collector");
 	worker.bgw_main_arg = (Datum) 0;
 	RegisterBackgroundWorker(&worker);