add heap checker and profiler demo

trunk/research/gperftools/heap-checker/heap_checker.cc

@@ -0,0 +1,73 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2013-2014 winlin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+/**
+set the pprof path if not set:
+    export PPROF_PATH=`pwd`/../../../objs/pprof
+to check mem leak:
+    make && env HEAPCHECK=normal ./heap_checker
+*/
+#include <stdio.h>
+#include <unistd.h>
+#include <signal.h>
+#include <stdlib.h>
+
+void explicit_leak_imp() {
+    printf("func leak: do something...\n");
+    for (int i = 0; i < 1024; ++i) {
+        char* p = new char[1024];
+    }
+    printf("func leak: memory leaked\n");
+}
+void explicit_leak() {
+    explicit_leak_imp();
+}
+
+char* pglobal = NULL;
+void global_leak_imp() {
+    printf("global leak: do something...\n");
+    for (int i = 0; i < 1024; ++i) {
+        pglobal = new char[189];
+    }
+    printf("global leak: memory leaked\n");
+}
+void global_leak() {
+    global_leak_imp();
+}
+
+void handler(int sig) {
+    exit(0);
+}
+int main(int argc, char** argv) {
+    signal(SIGINT, handler);
+    
+    global_leak();
+    printf("press CTRL+C if you want to abort the program.\n");
+    sleep(3);
+    
+    explicit_leak();
+    printf("press CTRL+C if you want to abort the program.\n");
+    sleep(3);
+    
+    return 0;
+}
+