--- a/c/blocked_mmap/main.cc	Sun May 11 19:32:39 2014 +0900
+++ b/c/blocked_mmap/main.cc	Tue Aug 05 15:02:54 2014 +0900
@@ -41,17 +41,17 @@
     int loop_num = file_size / page_size;
     loop_num += (file_size % page_size != 0);
 
-    char * file_mmap = NULL;
+    char * file_mmap = (char *)malloc(4096);
     char * file_head = NULL; // head of read file
 
     for (int i = 0; i < loop_num; i++) {
         // mmap 6th arg must be a multiple of the paging size.
-        file_mmap = (char *)mmap(0, page_size, PROT_READ, MAP_PRIVATE, fd, i*page_size);
-        if (i == 0) file_head = file_mmap;
-        file_mmap += page_size;
+        printf("pre   file_mmap addr : %p\n",file_mmap);
+        mmap(file_mmap + i*page_size, page_size, PROT_READ|PROT_WRITE, MAP_FIXED, fd, i*page_size);
+        printf("after file_mmap addr : %p\n",file_mmap);
     }
 
-    printf("%s\n",file_head);
+    printf("%s\n",file_mmap);
 
     munmap(file_mmap, file_size);
     close(fd);

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/c/portmidi/Makefile	Tue Aug 05 15:02:54 2014 +0900
@@ -0,0 +1,11 @@
+TARGET=portmidi
+OPTION= -Wall -O0 -g
+LIBS= /usr/local/Cellar/portmidi/217/lib/libportmidi.dylib
+
+$(TARGET):main.cc
+	clang++ $(OPTION) $(LIBS) -o $(TARGET) main.cc
+
+clean:
+	rm -f $(TARGET)
+	rm -r $(TARGET).dSYM
+	rm -f *~ \#*

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/c/portmidi/main.cc	Tue Aug 05 15:02:54 2014 +0900
@@ -0,0 +1,46 @@
+#include <iostream>
+#include "portmidi.h"
+#include "porttime.h"
+#include <time.h>
+#include <stdlib.h>
+
+#define TIME_PROC ((long (*)(void *)) Pt_Time)
+
+using namespace std;
+
+    PmStream * midi;
+    char line[80];
+    PmEvent buffer[5];
+    void process_midi(PtTimestamp timestamp, void *userData);
+
+int main(int argc, char *argv[])
+{
+    //pt_start must be called before initialising midi
+    Pt_Start(2000, &process_midi, 0);
+    Pm_Initialize();
+    int device = 0;//microsoft midi mapper...
+    Pm_OpenOutput(&midi,device,NULL,0,NULL,NULL,10);
+    /*calling callback function once. When I called Pt_start
+    it waits until 'resolution' millisecs have passed before
+    start, hence I call the callback function once beforehand */
+    process_midi(0, NULL);
+    cin.get();
+    //wiat for user input and then stop midi timer callback function...
+    Pt_Stop();
+    Pm_Close(midi);
+    printf("done closing and terminating...\n");
+    Pm_Terminate();
+}
+
+void process_midi(PtTimestamp timestamp, void *userData)
+{
+ buffer[0].timestamp = timestamp+0;
+        buffer[0].message = Pm_Message(0x90, 60, 100);
+        buffer[1].timestamp = timestamp+1000;
+        buffer[1].message = Pm_Message(0x90, 60, 0);
+        buffer[2].timestamp = timestamp+1000;
+        buffer[2].message = Pm_Message(0x90, 64, 100);
+        buffer[3].timestamp = timestamp+2000;
+        buffer[3].message = Pm_Message(0x90, 64, 0);
+ Pm_Write(midi, buffer, 4);
+}