diff --git a/include/def.h b/include/def.h
index 3f99855..47fc9bf 100644
--- a/include/def.h
+++ b/include/def.h
@@ -29,7 +29,6 @@ using uint_t = typename uint<N>::type;
 enum : std::size_t {
     invalid_value  = (std::numeric_limits<std::size_t>::max)(),
     data_length    = 64,
-    name_length    = 64,
     default_timeut = 100 // ms
 };
 
diff --git a/include/shm.h b/include/shm.h
index a7a0886..8430469 100644
--- a/include/shm.h
+++ b/include/shm.h
@@ -15,8 +15,8 @@ enum : unsigned {
 };
 
 IPC_EXPORT id_t   acquire(char const * name, std::size_t size, unsigned mode = create | open);
-IPC_EXPORT void * to_mem (id_t id);
-IPC_EXPORT void   release(id_t id, void * mem, std::size_t size);
+IPC_EXPORT void * get_mem(id_t id, std::size_t * size);
+IPC_EXPORT void   release(id_t id);
 IPC_EXPORT void   remove (char const * name);
 
 class IPC_EXPORT handle {
diff --git a/src/platform/shm_linux.cpp b/src/platform/shm_linux.cpp
index bd89215..e15e459 100644
--- a/src/platform/shm_linux.cpp
+++ b/src/platform/shm_linux.cpp
@@ -3,6 +3,7 @@
 #include <sys/shm.h>
 #include <sys/stat.h>
 #include <sys/mman.h>
+#include <sys/types.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <errno.h>
@@ -14,13 +15,19 @@
 
 #include "def.h"
 #include "log.h"
-#include "memory/resource.h"
+#include "pool_alloc.h"
 
 namespace {
 
 struct info_t {
     std::atomic_size_t acc_;
-    char name_[ipc::name_length];
+};
+
+struct id_info_t {
+    int         fd_   = -1;
+    void*       mem_  = nullptr;
+    std::size_t size_ = 0;
+    std::string name_;
 };
 
 constexpr std::size_t calc_size(std::size_t size) {
@@ -31,24 +38,17 @@ inline auto& acc_of(void* mem, std::size_t size) {
     return reinterpret_cast<info_t*>(static_cast<ipc::byte_t*>(mem) + size - sizeof(info_t))->acc_;
 }
 
-inline auto& str_of(void* mem, std::size_t size) {
-    return reinterpret_cast<info_t*>(static_cast<ipc::byte_t*>(mem) + size - sizeof(info_t))->name_;
-}
-
 } // internal-linkage
 
 namespace ipc {
 namespace shm {
 
 id_t acquire(char const * name, std::size_t size, unsigned mode) {
-    if (name == nullptr || name[0] == '\0' || size == 0) {
+    if (name == nullptr || name[0] == '\0') {
+        ipc::error("fail acquire: name is empty\n");
         return nullptr;
     }
     std::string op_name = std::string{"__IPC_SHM__"} + name;
-    if (op_name.size() >= ipc::name_length) {
-        ipc::error("name is too long!: [%d]%s\n", static_cast<int>(op_name.size()), op_name.c_str());
-        return nullptr;
-    }
     // Open the object for read-write access.
     int flag = O_RDWR;
     switch (mode) {
@@ -71,57 +71,84 @@ id_t acquire(char const * name, std::size_t size, unsigned mode) {
         ipc::error("fail shm_open[%d]: %s\n", errno, name);
         return nullptr;
     }
-    size = calc_size(size);
-    if (::ftruncate(fd, static_cast<off_t>(size)) != 0) {
-        ipc::error("fail ftruncate[%d]: %s\n", errno, name);
-        ::close(fd);
-        ::shm_unlink(op_name.c_str());
+    auto ii = mem::alloc<id_info_t>();
+    ii->fd_   = fd;
+    ii->size_ = size;
+    ii->name_ = std::move(op_name);
+    return ii;
+}
+
+void * get_mem(id_t id, std::size_t * size) {
+    if (id == nullptr) {
+        ipc::error("fail get_mem: invalid id (null)\n");
         return nullptr;
     }
-    void* mem = ::mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
-    ::close(fd);
+    auto ii = static_cast<id_info_t*>(id);
+    if (ii->mem_ != nullptr) {
+        if (size != nullptr) *size = ii->size_;
+        return ii->mem_;
+    }
+    int fd = ii->fd_;
+    if (fd == -1) {
+        ipc::error("fail to_mem: invalid id (fd = -1)\n");
+        return nullptr;
+    }
+    if (ii->size_ == 0) {
+        struct stat st;
+        if (::fstat(fd, &st) != 0) {
+            ipc::error("fail fstat[%d]: %s, size = %zd\n", errno, ii->name_.c_str(), ii->size_);
+            return nullptr;
+        }
+        ii->size_ = static_cast<std::size_t>(st.st_size);
+        if ((ii->size_ <= sizeof(info_t)) || (ii->size_ % sizeof(info_t))) {
+            ipc::error("fail to_mem: %s, invalid size = %zd\n", ii->name_.c_str(), ii->size_);
+            return nullptr;
+        }
+    }
+    else {
+        ii->size_ = calc_size(ii->size_);
+        if (::ftruncate(fd, static_cast<off_t>(ii->size_)) != 0) {
+            ipc::error("fail ftruncate[%d]: %s, size = %zd\n", errno, ii->name_.c_str(), ii->size_);
+            return nullptr;
+        }
+    }
+    void* mem = ::mmap(nullptr, ii->size_, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
     if (mem == MAP_FAILED) {
-        ipc::error("fail mmap[%d]: %s\n", errno, name);
-        ::shm_unlink(op_name.c_str());
+        ipc::error("fail mmap[%d]: %s, size = %zd\n", errno, ii->name_.c_str(), ii->size_);
         return nullptr;
     }
-    if (acc_of(mem, size).fetch_add(1, std::memory_order_release) == 0) {
-        std::memcpy(&str_of(mem, size), op_name.c_str(), op_name.size());
-    }
-    return static_cast<id_t>(mem);
+    ::close(fd);
+    ii->fd_  = -1;
+    ii->mem_ = mem;
+    if (size != nullptr) *size = ii->size_;
+    acc_of(mem, ii->size_).fetch_add(1, std::memory_order_release);
+    return mem;
 }
 
-void * to_mem(id_t id) {
-    return static_cast<void *>(id);
-}
-
-void release(id_t id, void * mem, std::size_t size) {
-    if (mem == nullptr) {
+void release(id_t id) {
+    if (id == nullptr) {
+        ipc::error("fail release: invalid id (null)\n");
         return;
     }
-    if (mem != to_mem(id)) {
+    auto ii = static_cast<id_info_t*>(id);
+    if (ii->mem_ == nullptr || ii->size_ == 0) {
+        ipc::error("fail release: invalid id (mem = %p, size = %zd)\n", ii->mem_, ii->size_);
         return;
     }
-    size = calc_size(size);
-    if (acc_of(mem, size).fetch_sub(1, std::memory_order_acquire) == 1) {
-        char name[ipc::name_length] = {};
-        std::memcpy(name, &str_of(mem, size), sizeof(name));
-        ::munmap(mem, size);
-        ::shm_unlink(name);
+    if (acc_of(ii->mem_, ii->size_).fetch_sub(1, std::memory_order_acquire) == 1) {
+        ::munmap(ii->mem_, ii->size_);
+        ::shm_unlink(ii->name_.c_str());
     }
-    else ::munmap(mem, size);
+    else ::munmap(ii->mem_, ii->size_);
+    mem::free(ii);
 }
 
 void remove(char const * name) {
     if (name == nullptr || name[0] == '\0') {
+        ipc::error("fail remove: name is empty\n");
         return;
     }
-    std::string op_name = std::string{"__IPC_SHM__"} + name;
-    if (op_name.size() >= ipc::name_length) {
-        ipc::error("name is too long!: [%d]%s\n", static_cast<int>(op_name.size()), op_name.c_str());
-        return;
-    }
-    ::shm_unlink(op_name.c_str());
+    ::shm_unlink((std::string{"__IPC_SHM__"} + name).c_str());
 }
 
 } // namespace shm
diff --git a/src/platform/shm_win.cpp b/src/platform/shm_win.cpp
index 3b3cb08..175f307 100644
--- a/src/platform/shm_win.cpp
+++ b/src/platform/shm_win.cpp
@@ -7,14 +7,26 @@
 
 #include "def.h"
 #include "log.h"
-#include "memory/resource.h"
+#include "pool_alloc.h"
+
 #include "platform/to_tchar.h"
 
+namespace {
+
+struct id_info_t {
+    HANDLE      h_    = NULL;
+    void*       mem_  = nullptr;
+    std::size_t size_ = 0;
+};
+
+} // internal-linkage
+
 namespace ipc {
 namespace shm {
 
 id_t acquire(char const * name, std::size_t size, unsigned mode) {
-    if (name == nullptr || name[0] == '\0' || size == 0) {
+    if (name == nullptr || name[0] == '\0') {
+        ipc::error("fail acquire: name is empty\n");
         return nullptr;
     }
     HANDLE h;
@@ -38,28 +50,67 @@ id_t acquire(char const * name, std::size_t size, unsigned mode) {
         ipc::error("fail CreateFileMapping/OpenFileMapping[%d]: %s\n", static_cast<int>(::GetLastError()), name);
         return nullptr;
     }
-    return static_cast<id_t>(h);
+    auto ii = mem::alloc<id_info_t>();
+    ii->h_    = h;
+    ii->size_ = size;
+    return ii;
 }
 
-void * to_mem(id_t id) {
-    if (id == nullptr) return nullptr;
-    HANDLE h = static_cast<HANDLE>(id);
-    LPVOID mem = ::MapViewOfFile(h, FILE_MAP_ALL_ACCESS, 0, 0, 0);
+void * get_mem(id_t id, std::size_t * size) {
+    if (id == nullptr) {
+        ipc::error("fail get_mem: invalid id (null)\n");
+        return nullptr;
+    }
+    auto ii = static_cast<id_info_t*>(id);
+    if (ii->mem_ != nullptr) {
+        if (size != nullptr) *size = ii->size_;
+        return ii->mem_;
+    }
+    if (ii->h_ == NULL) {
+        ipc::error("fail to_mem: invalid id (h = null)\n");
+        return nullptr;
+    }
+    LPVOID mem = ::MapViewOfFile(ii->h_, FILE_MAP_ALL_ACCESS, 0, 0, 0);
     if (mem == NULL) {
         ipc::error("fail MapViewOfFile[%d]\n", static_cast<int>(::GetLastError()));
         return nullptr;
     }
+    PMEMORY_BASIC_INFORMATION mem_info;
+    if (::VirtualQuery(mem, &mem_info, sizeof(mem_info)) == 0) {
+        ipc::error("fail VirtualQuery[%d]\n", static_cast<int>(::GetLastError()));
+        return nullptr;
+    }
+    ii->mem_  = mem;
+    ii->size_ = static_cast<std::size_t>(mem_info.RegionSize);
+    if (size != nullptr) *size = ii->size_;
     return static_cast<void *>(mem);
 }
 
-void release(id_t id, void * mem, std::size_t /*size*/) {
-    if (id  == nullptr) return;
-    if (mem == nullptr) return;
-    ::UnmapViewOfFile(static_cast<LPVOID>(mem));
-    ::CloseHandle(static_cast<HANDLE>(id));
+void release(id_t id) {
+    if (id == nullptr) {
+        ipc::error("fail release: invalid id (null)\n");
+        return;
+    }
+    auto ii = static_cast<id_info_t*>(id);
+    if (ii->mem_ == nullptr || ii->size_ == 0) {
+        ipc::error("fail release: invalid id (mem = %p, size = %zd)\n", ii->mem_, ii->size_);
+        return;
+    }
+    if (ii->h_ == NULL) {
+        ipc::error("fail release: invalid id (h = null)\n");
+        return;
+    }
+    ::UnmapViewOfFile(static_cast<LPCVOID>(ii->mem_));
+    ::CloseHandle(ii->h_);
+    mem::free(ii);
 }
 
-void remove(char const * /*name*/) {
+void remove(char const * name) {
+    if (name == nullptr || name[0] == '\0') {
+        ipc::error("fail remove: name is empty\n");
+        return;
+    }
+    // Do Nothing.
 }
 
 } // namespace shm
diff --git a/src/shm.cpp b/src/shm.cpp
index efeaba6..37227c1 100644
--- a/src/shm.cpp
+++ b/src/shm.cpp
@@ -59,15 +59,14 @@ char const * handle::name() const {
 
 bool handle::acquire(char const * name, std::size_t size, unsigned mode) {
     release();
-    impl(p_)->id_ = shm::acquire((impl(p_)->n_ = name).c_str(),
-                                  impl(p_)->s_ = size, mode);
-    impl(p_)->m_  = shm::to_mem  (impl(p_)->id_);
+    impl(p_)->id_ = shm::acquire((impl(p_)->n_ = name).c_str(), size, mode);
+    impl(p_)->m_  = shm::get_mem(impl(p_)->id_, &(impl(p_)->s_));
     return valid();
 }
 
 void handle::release() {
     if (!valid()) return;
-    shm::release(impl(p_)->id_, impl(p_)->m_, impl(p_)->s_);
+    shm::release(impl(p_)->id_);
     impl(p_)->id_ = nullptr;
     impl(p_)->m_  = nullptr;
     impl(p_)->s_  = 0;
diff --git a/test/test_ipc.cpp b/test/test_ipc.cpp
index 91e8a62..8e103e0 100644
--- a/test/test_ipc.cpp
+++ b/test/test_ipc.cpp
@@ -347,6 +347,8 @@ void Unit::test_route() {
 
     t1.join();
     t2.join();
+
+    test_prod_cons<ipc::route, 1, 1>(); // test & verify
 }
 
 void Unit::test_route_rtt() {
diff --git a/test/test_shm.cpp b/test/test_shm.cpp
index 5fa39c9..01a2a34 100644
--- a/test/test_shm.cpp
+++ b/test/test_shm.cpp
@@ -38,15 +38,15 @@ void Unit::test_acquire() {
     QVERIFY(!shm_hd__.valid());
 
     QVERIFY(shm_hd__.acquire("my-test-1", 1024));
-    QVERIFY(shm_hd__.size() == 1024);
+    QVERIFY(shm_hd__.valid());
     QCOMPARE(shm_hd__.name(), "my-test-1");
 
     QVERIFY(shm_hd__.acquire("my-test-2", 2048));
-    QVERIFY(shm_hd__.size() == 2048);
+    QVERIFY(shm_hd__.valid());
     QCOMPARE(shm_hd__.name(), "my-test-2");
 
     QVERIFY(shm_hd__.acquire("my-test-3", 4096));
-    QVERIFY(shm_hd__.size() == 4096);
+    QVERIFY(shm_hd__.valid());
     QCOMPARE(shm_hd__.name(), "my-test-3");
 }