add heap checker and profiler demo

@@ -440,7 +440,8 @@ if [ $SRS_GPERF = YES ]; then
             rm -rf ${SRS_OBJS}/gperftools-2.1 && cd ${SRS_OBJS} && 
             rm -rf ${SRS_OBJS}/gperftools-2.1 && cd ${SRS_OBJS} && 
             unzip -q ../3rdparty/gperftools-2.1.zip && cd gperftools-2.1 &&
             unzip -q ../3rdparty/gperftools-2.1.zip && cd gperftools-2.1 &&
             ./configure --prefix=`pwd`/_release --enable-frame-pointers && make ${SRS_JOBS} && make install &&
             ./configure --prefix=`pwd`/_release --enable-frame-pointers && make ${SRS_JOBS} && make install &&
-            cd .. && rm -f gperf && ln -sf gperftools-2.1/_release gperf
+            cd .. && rm -f gperf && ln -sf gperftools-2.1/_release gperf &&
+            rm -f pprof && ln -sf gperf/bin/pprof pprof
         )
         )
     fi
     fi
     # check status
     # check status

+heap_checker: heap_checker.cc Makefile
+	g++ -o heap_checker heap_checker.cc -g -O0 -ansi \
+        -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free \
+        ../../../objs/gperf/lib/libtcmalloc_and_profiler.a -lpthread
+clean:
+	rm -f heap_checker

+/*
+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;
+}
+

+heap_profiler: heap_profiler.cc Makefile
+	g++ -o heap_profiler heap_profiler.cc -g -O0 -ansi \
+        -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free \
+        -I../../../objs/gperf/include ../../../objs/gperf/lib/libtcmalloc_and_profiler.a -lpthread
+clean:
+	rm -f heap_profiler srs.*.heap

+/*
+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 do mem profile:
+    make && rm -f srs.*.heap && env ./heap_profiler
+    $PPROF_PATH --text heap_profiler ./*.heap
+*/
+#include <stdio.h>
+#include <unistd.h>
+#include <signal.h>
+#include <stdlib.h>
+
+#include <gperftools/heap-profiler.h>
+
+void memory_alloc_profile_imp() {
+    for (int i = 0; i < 2; ++i) {
+        char* p = new char[110 * 1024 * 1024];
+        for (int j = 0; j < 110 * 1024 * 1024; ++j) {
+            p[j] = j;
+        }
+        printf("mem profile, increase 110MB\n");
+        printf("press CTRL+C if you want to abort the program.\n");
+        sleep(5);
+    }
+}
+void memory_alloc_profile() {
+    memory_alloc_profile_imp();
+}
+
+void handler(int sig) {
+    exit(0);
+}
+int main(int argc, char** argv) {
+    signal(SIGINT, handler);
+    
+    // must start profiler manually.
+    HeapProfilerStart("srs");
+    
+    memory_alloc_profile();
+    // not neccessary to call stop.
+    //HeapProfilerStop();
+    
+    return 0;
+}
+