Merge #9387: [Refactor] RAII of libevent stuff using unique ptrs with deleters

05a55a6 Added EVENT_CFLAGS to test makefile to explicitly include libevent headers. (Karl-Johan Alm)
280a559 Added some simple tests for the RAII-style events. (Karl-Johan Alm)
7f7f102 Switched bitcoin-cli.cpp to use RAII unique pointers with deleters. (Karl-Johan Alm)
e5534d2 Added std::unique_ptr<> wrappers with deleters for libevent modules. (Karl-Johan Alm)

src/test/raii_event_tests.cpp

@@ -0,0 +1,88 @@
+// Copyright (c) 2016 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <event2/event.h>
+#include <map>
+#include <stdlib.h>
+
+#include "support/events.h"
+
+#include "test/test_bitcoin.h"
+
+#include <vector>
+
+#include <boost/test/unit_test.hpp>
+
+static std::map<void*, short> tags;
+static std::map<void*, uint16_t> orders;
+static uint16_t tagSequence = 0;
+
+static void* tag_malloc(size_t sz) {
+    void* mem = malloc(sz);
+    if (!mem) return mem;
+    tags[mem]++;
+    orders[mem] = tagSequence++;
+    return mem;
+}
+
+static void tag_free(void* mem) {
+    tags[mem]--;
+    orders[mem] = tagSequence++;
+    free(mem);
+}
+
+BOOST_FIXTURE_TEST_SUITE(raii_event_tests, BasicTestingSetup)
+
+BOOST_AUTO_TEST_CASE(raii_event_creation)
+{
+    event_set_mem_functions(tag_malloc, realloc, tag_free);
+    
+    void* base_ptr = NULL;
+    {
+        auto base = obtain_event_base();
+        base_ptr = (void*)base.get();
+        BOOST_CHECK(tags[base_ptr] == 1);
+    }
+    BOOST_CHECK(tags[base_ptr] == 0);
+    
+    void* event_ptr = NULL;
+    {
+        auto base = obtain_event_base();
+        auto event = obtain_event(base.get(), -1, 0, NULL, NULL);
+
+        base_ptr = (void*)base.get();
+        event_ptr = (void*)event.get();
+
+        BOOST_CHECK(tags[base_ptr] == 1);
+        BOOST_CHECK(tags[event_ptr] == 1);
+    }
+    BOOST_CHECK(tags[base_ptr] == 0);
+    BOOST_CHECK(tags[event_ptr] == 0);
+    
+    event_set_mem_functions(malloc, realloc, free);
+}
+
+BOOST_AUTO_TEST_CASE(raii_event_order)
+{
+    event_set_mem_functions(tag_malloc, realloc, tag_free);
+    
+    void* base_ptr = NULL;
+    void* event_ptr = NULL;
+    {
+        auto base = obtain_event_base();
+        auto event = obtain_event(base.get(), -1, 0, NULL, NULL);
+
+        base_ptr = (void*)base.get();
+        event_ptr = (void*)event.get();
+
+        // base should have allocated before event
+        BOOST_CHECK(orders[base_ptr] < orders[event_ptr]);
+    }
+    // base should be freed after event
+    BOOST_CHECK(orders[base_ptr] > orders[event_ptr]);
+
+    event_set_mem_functions(malloc, realloc, free);
+}
+
+BOOST_AUTO_TEST_SUITE_END()