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+demo/PyCpp/CMakeFiles/PyCpp.dir/__/__/src/waiter.cpp.o: src/libipc/utility/concept.h
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+demo/PyCpp/CMakeFiles/PyCpp.dir/__/__/src/waiter.cpp.o: src/libipc/waiter_helper.h
+
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+demo/PyCpp/CMakeFiles/PyCpp.dir/util.cpp.o: demo/PyCpp/util.h
+
diff --git a/demo/PyCpp/CMakeFiles/PyCpp.dir/flags.make b/demo/PyCpp/CMakeFiles/PyCpp.dir/flags.make
new file mode 100644
index 0000000..e5fb53e
--- /dev/null
+++ b/demo/PyCpp/CMakeFiles/PyCpp.dir/flags.make
@@ -0,0 +1,10 @@
+# CMAKE generated file: DO NOT EDIT!
+# Generated by "Unix Makefiles" Generator, CMake Version 3.18
+
+# compile CXX with /usr/bin/c++
+CXX_DEFINES = -DPyCpp_EXPORTS
+
+CXX_INCLUDES = -I/home/ubuntu/ipc/cpp-ipc/include -I/home/ubuntu/ipc/cpp-ipc/3rdparty -I/home/ubuntu/ipc/cpp-ipc/src
+
+CXX_FLAGS = -fPIC -D__IPC_LIBRARY__ -fPIC -std=gnu++1z
+
diff --git a/demo/PyCpp/CMakeFiles/PyCpp.dir/link.txt b/demo/PyCpp/CMakeFiles/PyCpp.dir/link.txt
new file mode 100644
index 0000000..a8a0787
--- /dev/null
+++ b/demo/PyCpp/CMakeFiles/PyCpp.dir/link.txt
@@ -0,0 +1 @@
+/usr/bin/c++ -fPIC -shared -Wl,-soname,libPyCpp.so -o ../../bin/libPyCpp.so CMakeFiles/PyCpp.dir/__/__/src/libipc/platform/shm_linux.cpp.o CMakeFiles/PyCpp.dir/__/__/src/buffer.cpp.o CMakeFiles/PyCpp.dir/__/__/src/ipc.cpp.o CMakeFiles/PyCpp.dir/__/__/src/pool_alloc.cpp.o CMakeFiles/PyCpp.dir/__/__/src/shm.cpp.o CMakeFiles/PyCpp.dir/__/__/src/tls_pointer.cpp.o CMakeFiles/PyCpp.dir/__/__/src/waiter.cpp.o CMakeFiles/PyCpp.dir/Client.cpp.o CMakeFiles/PyCpp.dir/util.cpp.o  -lpthread -lrt 
diff --git a/demo/PyCpp/CMakeFiles/PyCpp.dir/progress.make b/demo/PyCpp/CMakeFiles/PyCpp.dir/progress.make
new file mode 100644
index 0000000..3cb65cf
--- /dev/null
+++ b/demo/PyCpp/CMakeFiles/PyCpp.dir/progress.make
@@ -0,0 +1,11 @@
+CMAKE_PROGRESS_1 = 3
+CMAKE_PROGRESS_2 = 4
+CMAKE_PROGRESS_3 = 5
+CMAKE_PROGRESS_4 = 6
+CMAKE_PROGRESS_5 = 7
+CMAKE_PROGRESS_6 = 8
+CMAKE_PROGRESS_7 = 9
+CMAKE_PROGRESS_8 = 10
+CMAKE_PROGRESS_9 = 11
+CMAKE_PROGRESS_10 = 12
+
diff --git a/demo/PyCpp/CMakeFiles/progress.marks b/demo/PyCpp/CMakeFiles/progress.marks
new file mode 100644
index 0000000..f599e28
--- /dev/null
+++ b/demo/PyCpp/CMakeFiles/progress.marks
@@ -0,0 +1 @@
+10
diff --git a/demo/PyCpp/CMakeLists.txt b/demo/PyCpp/CMakeLists.txt
new file mode 100644
index 0000000..f0a977b
--- /dev/null
+++ b/demo/PyCpp/CMakeLists.txt
@@ -0,0 +1,37 @@
+project(PyCpp)
+
+add_compile_options(-D__IPC_LIBRARY__)
+
+if(NOT MSVC)
+  add_compile_options(-fPIC)
+endif()
+
+include_directories(
+    ${CMAKE_SOURCE_DIR}/include 
+    ${CMAKE_SOURCE_DIR}/3rdparty
+    ${CMAKE_SOURCE_DIR}/src)
+
+if(UNIX)
+  file(GLOB SRC_FILES ${CMAKE_SOURCE_DIR}/src/libipc/platform/*_linux.cpp)
+else()
+  file(GLOB SRC_FILES ${CMAKE_SOURCE_DIR}/src/libipc/platform/*_win.cpp)
+endif()
+aux_source_directory(${CMAKE_SOURCE_DIR}/src SRC_FILES)
+aux_source_directory(${CMAKE_SOURCE_DIR}/demo/PyCpp SRC_FILES)
+file(GLOB HEAD_FILES
+  ${CMAKE_SOURCE_DIR}/include/libipc/*.h
+  ${CMAKE_SOURCE_DIR}/src/libipc/*.h
+  ${CMAKE_SOURCE_DIR}/src/libipc/*.inc
+  ${CMAKE_SOURCE_DIR}/src/libipc/circ/*.h
+  ${CMAKE_SOURCE_DIR}/src/libipc/memory/*.h
+  ${CMAKE_SOURCE_DIR}/src/libipc/platform/*.h
+  ${CMAKE_SOURCE_DIR}/src/libipc/utility/*.h
+  ${CMAKE_SOURCE_DIR}/src/demo/PyCpp/*.h)
+
+add_library(${PROJECT_NAME} SHARED ${SRC_FILES} ${HEAD_FILES})
+if(NOT MSVC)
+  target_link_libraries(${PROJECT_NAME} PUBLIC
+      pthread
+      $<$<NOT:$<STREQUAL:${CMAKE_SYSTEM_NAME},Windows>>:rt>)
+endif()
+
diff --git a/demo/PyCpp/Client.cpp b/demo/PyCpp/Client.cpp
new file mode 100644
index 0000000..2d13365
--- /dev/null
+++ b/demo/PyCpp/Client.cpp
@@ -0,0 +1,161 @@
+
+#include <signal.h>
+#include <iostream>
+#include <string>
+#include <cstring>
+#include <chrono>
+#include <cstddef>
+
+#include "libipc/ipc.h"
+#include "libipc/shm.h"
+#include "capo/random.hpp"
+#include "util.h"
+
+using string = std::string;
+
+
+using namespace ipc::shm;
+
+namespace ipc {
+
+constexpr char const name__  [] = "ipc-kvs";
+
+capo::random<> rand__{
+    static_cast<int>(1),
+    static_cast<int>(127)
+};
+
+ipc::channel shared_chan { name__, ipc::sender | ipc::receiver };
+
+char * kvs_client(char id, bool is_read, string info) {
+    
+    auto client_id = 2 + id;
+    std::cout << "Launching client " << client_id << " ...\n";
+
+    auto start_stamp = std::chrono::system_clock::now();
+    string req;
+    auto req_id = rand__();
+    string key_name = "a" + info;
+    
+    // request addres (1 byte) | resp address (1 byte) | get/put (1 byte) | request id (1 byte) | metadata len (1 byte)| metadata | optional value
+    req.push_back(1);
+    req.push_back(client_id);
+    if (is_read){
+        req.push_back(1);
+        req.push_back(req_id);
+        req.push_back((char) key_name.size());
+        req += key_name;
+    }
+    else {
+        req.push_back(2);
+        req.push_back(req_id);
+        req.push_back((char) key_name.size());
+        req += key_name;
+        auto shm_size = stoi(info) + 1;
+        req += std::to_string(shm_size);
+        int data_len = stoi(info);
+        auto shm_id = acquire(key_name.c_str(), shm_size);
+        auto shm_ptr = (char *) get_mem(shm_id, nullptr);
+        memset(shm_ptr, '1', data_len);
+        shm_ptr[data_len] = '\0';
+    }
+
+    auto ready_stamp = std::chrono::system_clock::now();
+
+    while (!shared_chan.send(req)) {
+        // waiting for connection
+        shared_chan.wait_for_recv(2);
+    }
+
+    // recv ack
+    auto dd = shared_chan.recv();
+    auto str = static_cast<char*>(dd.data());
+
+    // response address (1 byte) | request id (1 byte) | is_success (1 byte) | optional value
+    if (str == nullptr) {
+        char * err = "Ack error";
+        return err;
+    }
+    if (client_id != (int) str[0]){
+        char * err = "Not my ack";
+        return err;
+    }  
+    if (str[1] != req_id) {
+        char * err = "request id doesn't match";
+        return err;
+    }
+    auto ack_stamp = std::chrono::system_clock::now();
+
+        
+    if (is_read){
+        auto size_len = stoi(string(str + 3));
+        auto shm_id = acquire(key_name.c_str(), size_len);
+        auto shm_ptr = (char *) get_mem(shm_id, nullptr);
+
+        auto ptr_stamp = std::chrono::system_clock::now();
+
+        auto val_size = strlen(shm_ptr);
+        auto val_stamp = std::chrono::system_clock::now();
+
+        auto ready_time = std::chrono::duration_cast<std::chrono::microseconds>(ready_stamp - start_stamp).count();
+        auto ack_time = std::chrono::duration_cast<std::chrono::microseconds>(ack_stamp - ready_stamp).count();
+        auto ptr_time = std::chrono::duration_cast<std::chrono::microseconds>(ptr_stamp - ack_stamp).count();
+        auto val_time = std::chrono::duration_cast<std::chrono::microseconds>(val_stamp - ptr_stamp).count();
+
+        std::cout << "Receive Get " << key_name << ", val_size: " << val_size
+                                                << ", shm_size: " << size_len
+                                                << ", ready_time: " << ready_time
+                                                << ", ack_time: " << ack_time
+                                                << ", ptr_time: " << ptr_time
+                                                << ", val_time: " << val_time
+                                                <<"\n";
+
+        return shm_ptr;
+    } else {
+        auto ready_time = std::chrono::duration_cast<std::chrono::microseconds>(ready_stamp - start_stamp).count();
+        auto ack_time = std::chrono::duration_cast<std::chrono::microseconds>(ack_stamp - ready_stamp).count();
+
+        std::cout << "Receive Put " << key_name << ", ready_time "<< ready_time 
+                                                << ", ack_time: " << ack_time 
+                                                <<"\n";
+        char * put_Msg = "Receive Put";
+        return put_Msg;
+    }
+}
+
+
+
+
+PyObject* WrappClient(PyObject* self, PyObject *args)
+{
+    int id;
+    int is_read;
+    const char * info;
+    if(!PyArg_ParseTuple(args, "iiz", &id, &is_read, &info)){
+        return NULL;
+    }
+    char * resp = kvs_client(id, is_read, info);
+    return PyByteArray_FromString_WithoutCopy(resp, strlen(resp));
+
+}
+
+static PyMethodDef client_methods[] = {
+ {"kvs_client", WrappClient, METH_VARARGS, "something"},
+ {NULL, NULL}
+};
+
+static struct PyModuleDef client_module = {
+        PyModuleDef_HEAD_INIT,
+        "test",
+        NULL,
+        -1,
+        client_methods
+};
+
+PyMODINIT_FUNC PyInit_libPyCpp()
+{
+     return PyModule_Create(&client_module);
+}
+
+}
+
diff --git a/demo/PyCpp/cmake_install.cmake b/demo/PyCpp/cmake_install.cmake
new file mode 100644
index 0000000..a811c24
--- /dev/null
+++ b/demo/PyCpp/cmake_install.cmake
@@ -0,0 +1,44 @@
+# Install script for directory: /home/ubuntu/ipc/cpp-ipc/demo/PyCpp
+
+# Set the install prefix
+if(NOT DEFINED CMAKE_INSTALL_PREFIX)
+  set(CMAKE_INSTALL_PREFIX "/usr/local")
+endif()
+string(REGEX REPLACE "/$" "" CMAKE_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
+
+# Set the install configuration name.
+if(NOT DEFINED CMAKE_INSTALL_CONFIG_NAME)
+  if(BUILD_TYPE)
+    string(REGEX REPLACE "^[^A-Za-z0-9_]+" ""
+           CMAKE_INSTALL_CONFIG_NAME "${BUILD_TYPE}")
+  else()
+    set(CMAKE_INSTALL_CONFIG_NAME "")
+  endif()
+  message(STATUS "Install configuration: \"${CMAKE_INSTALL_CONFIG_NAME}\"")
+endif()
+
+# Set the component getting installed.
+if(NOT CMAKE_INSTALL_COMPONENT)
+  if(COMPONENT)
+    message(STATUS "Install component: \"${COMPONENT}\"")
+    set(CMAKE_INSTALL_COMPONENT "${COMPONENT}")
+  else()
+    set(CMAKE_INSTALL_COMPONENT)
+  endif()
+endif()
+
+# Install shared libraries without execute permission?
+if(NOT DEFINED CMAKE_INSTALL_SO_NO_EXE)
+  set(CMAKE_INSTALL_SO_NO_EXE "1")
+endif()
+
+# Is this installation the result of a crosscompile?
+if(NOT DEFINED CMAKE_CROSSCOMPILING)
+  set(CMAKE_CROSSCOMPILING "FALSE")
+endif()
+
+# Set default install directory permissions.
+if(NOT DEFINED CMAKE_OBJDUMP)
+  set(CMAKE_OBJDUMP "/usr/bin/objdump")
+endif()
+
diff --git a/demo/PyCpp/util.cpp b/demo/PyCpp/util.cpp
new file mode 100644
index 0000000..fa27369
--- /dev/null
+++ b/demo/PyCpp/util.cpp
@@ -0,0 +1,46 @@
+#include "util.h"
+namespace ipc {
+        
+    PyObject *
+    PyByteArray_FromString_WithoutCopy(char *bytes, Py_ssize_t size)
+    {
+        PyByteArrayObject *arrayObject;
+        Py_ssize_t alloc;
+
+        if (size < 0) {
+            PyErr_SetString(PyExc_SystemError,
+                "Negative size passed to PyByteArray_FromStringAndSize");
+            return NULL;
+        }
+
+        /* Prevent buffer overflow when setting alloc to size+1. */
+        if (size == PY_SSIZE_T_MAX) {
+            return PyErr_NoMemory();
+        }
+
+        arrayObject = PyObject_New(PyByteArrayObject, &PyByteArray_Type);
+        if (arrayObject == NULL)
+            return NULL;
+
+        if (size == 0) {
+            arrayObject->ob_bytes = NULL;
+            alloc = 0;
+        }
+        else {
+            alloc = size + 1;
+            // arrayObject->ob_bytes = PyObject_Malloc(alloc);
+            if (arrayObject->ob_bytes == NULL) {
+                Py_DECREF(arrayObject);
+                return PyErr_NoMemory();
+            }
+            arrayObject->ob_bytes = bytes;
+        }
+        Py_SIZE(arrayObject) = size;
+        arrayObject->ob_alloc = alloc;
+        arrayObject->ob_start = arrayObject->ob_bytes;
+        arrayObject->ob_exports = 0;
+
+        return (PyObject *)arrayObject;
+    }       
+
+}
diff --git a/demo/PyCpp/util.h b/demo/PyCpp/util.h
new file mode 100644
index 0000000..81a6f62
--- /dev/null
+++ b/demo/PyCpp/util.h
@@ -0,0 +1,5 @@
+#include<python3.6/Python.h>
+
+namespace ipc {
+	PyObject * PyByteArray_FromString_WithoutCopy(char *bytes, Py_ssize_t size);
+}
diff --git a/demo/kvs/CMakeLists.txt b/demo/kvs/CMakeLists.txt
index ddfac36..2a46f70 100644
--- a/demo/kvs/CMakeLists.txt
+++ b/demo/kvs/CMakeLists.txt
@@ -9,3 +9,4 @@ file(GLOB HEAD_FILES ./*.h)
 add_executable(${PROJECT_NAME} ${SRC_FILES} ${HEAD_FILES})
 
 target_link_libraries(${PROJECT_NAME} ipc)
+
diff --git a/test/test.h b/test/test.h
index 19bd22b..e0271c5 100755
--- a/test/test.h
+++ b/test/test.h
@@ -83,4 +83,4 @@ inline static thread_pool & reader() {
     return pool;
 }
 
-} // namespace ipc_ut
\ No newline at end of file
+} // namespace ipc_ut