diff --git a/build/test.pro b/build/test.pro
index d74222d..51b65b6 100644
--- a/build/test.pro
+++ b/build/test.pro
@@ -27,9 +27,10 @@ HEADERS += \
 SOURCES += \
     ../test/main.cpp \
     ../test/test_shm.cpp \
+    ../test/test_mem.cpp \
     ../test/test_circ.cpp \
-    ../test/test_ipc.cpp \
-    ../test/test_mem.cpp
+    ../test/test_waiter.cpp \
+    ../test/test_ipc.cpp
 
 LIBS += \
     -L$${DESTDIR} -lipc
diff --git a/src/memory/resource.h b/src/memory/resource.h
index f69d174..dfeacfb 100644
--- a/src/memory/resource.h
+++ b/src/memory/resource.h
@@ -18,12 +18,12 @@ namespace ipc {
 namespace mem {
 
 template <std::size_t Size>
-using sync_fixed_alloc = synchronized<page_fixed_alloc<Size>>;
+using sync_fixed_alloc = mem::synchronized<page_fixed_alloc<Size>>;
 
 template <std::size_t Size>
 using sync_fixed = mem::detail::fixed<Size, sync_fixed_alloc>;
 
-using sync_pool_alloc = detail::pool_alloc<sync_fixed>;
+using sync_pool_alloc = mem::detail::pool_alloc<sync_fixed>;
 
 template <typename T>
 using allocator = allocator_wrapper<T, sync_pool_alloc>;
diff --git a/src/memory/wrapper.h b/src/memory/wrapper.h
index 5acfca5..1d5b61c 100644
--- a/src/memory/wrapper.h
+++ b/src/memory/wrapper.h
@@ -199,5 +199,32 @@ public:
     }
 };
 
+////////////////////////////////////////////////////////////////
+/// Static allocation wrapper
+////////////////////////////////////////////////////////////////
+
+template <typename AllocP>
+class statical {
+public:
+    using alloc_policy = AllocP;
+
+    static alloc_policy& instance() {
+        static alloc_policy alloc;
+        return alloc;
+    }
+
+    static void clear() {
+        instance().clear();
+    }
+
+    static void* alloc(std::size_t size) {
+        return instance().alloc(size);
+    }
+
+    static void free(void* p, std::size_t size) {
+        instance().free(p, size);
+    }
+};
+
 } // namespace mem
 } // namespace ipc
diff --git a/src/platform/waiter_linux.h b/src/platform/waiter_linux.h
index e7987ab..effe1f7 100644
--- a/src/platform/waiter_linux.h
+++ b/src/platform/waiter_linux.h
@@ -1,6 +1,5 @@
 #pragma once
 
-#include <pthread.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <semaphore.h>
@@ -72,123 +71,6 @@ public:
 #pragma pop_macro("IPC_SEMAPHORE_FUNC_")
 };
 
-class mutex {
-    pthread_mutex_t mutex_ = PTHREAD_MUTEX_INITIALIZER;
-
-public:
-    pthread_mutex_t& native() {
-        return mutex_;
-    }
-
-    bool open() {
-        int eno;
-        // init mutex
-        pthread_mutexattr_t mutex_attr;
-        if ((eno = ::pthread_mutexattr_init(&mutex_attr)) != 0) {
-            ipc::error("fail pthread_mutexattr_init[%d]\n", eno);
-            return false;
-        }
-        IPC_UNUSED_ auto guard_mutex_attr = unique_ptr(&mutex_attr, ::pthread_mutexattr_destroy);
-        if ((eno = ::pthread_mutexattr_setpshared(&mutex_attr, PTHREAD_PROCESS_SHARED)) != 0) {
-            ipc::error("fail pthread_mutexattr_setpshared[%d]\n", eno);
-            return false;
-        }
-        if ((eno = ::pthread_mutex_init(&mutex_, &mutex_attr)) != 0) {
-            ipc::error("fail pthread_mutex_init[%d]\n", eno);
-            return false;
-        }
-        return true;
-    }
-
-    bool close() {
-        int eno;
-        if ((eno = ::pthread_mutex_destroy(&mutex_)) != 0) {
-            ipc::error("fail pthread_mutex_destroy[%d]\n", eno);
-            return false;
-        }
-        return true;
-    }
-
-    bool lock() {
-        int eno;
-        if ((eno = ::pthread_mutex_lock(&mutex_)) != 0) {
-            ipc::error("fail pthread_mutex_lock[%d]\n", eno);
-            return false;
-        }
-        return true;
-    }
-
-    bool unlock() {
-        int eno;
-        if ((eno = ::pthread_mutex_unlock(&mutex_)) != 0) {
-            ipc::error("fail pthread_mutex_unlock[%d]\n", eno);
-            return false;
-        }
-        return true;
-    }
-};
-
-class condition {
-    pthread_cond_t cond_  = PTHREAD_COND_INITIALIZER;
-
-public:
-    bool open() {
-        int eno;
-        // init condition
-        pthread_condattr_t cond_attr;
-        if ((eno = ::pthread_condattr_init(&cond_attr)) != 0) {
-            ipc::error("fail pthread_condattr_init[%d]\n", eno);
-            return false;
-        }
-        IPC_UNUSED_ auto guard_cond_attr = unique_ptr(&cond_attr, ::pthread_condattr_destroy);
-        if ((eno = ::pthread_condattr_setpshared(&cond_attr, PTHREAD_PROCESS_SHARED)) != 0) {
-            ipc::error("fail pthread_condattr_setpshared[%d]\n", eno);
-            return false;
-        }
-        if ((eno = ::pthread_cond_init(&cond_, &cond_attr)) != 0) {
-            ipc::error("fail pthread_cond_init[%d]\n", eno);
-            return false;
-        }
-        return true;
-    }
-
-    bool close() {
-        int eno;
-        if ((eno = ::pthread_cond_destroy(&cond_)) != 0) {
-            ipc::error("fail pthread_cond_destroy[%d]\n", eno);
-            return false;
-        }
-        return true;
-    }
-
-    bool wait(mutex& mtx) {
-        int eno;
-        if ((eno = ::pthread_cond_wait(&cond_, &mtx.native())) != 0) {
-            ipc::error("fail pthread_cond_wait[%d]\n", eno);
-            return false;
-        }
-        return true;
-    }
-
-    bool notify() {
-        int eno;
-        if ((eno = ::pthread_cond_signal(&cond_)) != 0) {
-            ipc::error("fail pthread_cond_signal[%d]\n", eno);
-            return false;
-        }
-        return true;
-    }
-
-    bool broadcast() {
-        int eno;
-        if ((eno = ::pthread_cond_broadcast(&cond_)) != 0) {
-            ipc::error("fail pthread_cond_broadcast[%d]\n", eno);
-            return false;
-        }
-        return true;
-    }
-};
-
 class event {
     std::atomic<std::size_t>* cnt_ = nullptr;
     semaphore::handle_t sem_ = semaphore::invalid();
@@ -198,7 +80,9 @@ class event {
         return "__IPC_WAIT__" + std::to_string(wait_id_);
     }
 
-    void open() {
+public:
+    event(std::size_t id)
+        : wait_id_(static_cast<uint_t<16>>(id)) {
         auto n = name();
         cnt_ = static_cast<std::atomic<std::size_t>*>(
                     shm::acquire(n.c_str(), sizeof(std::atomic<std::size_t>)));
@@ -206,27 +90,16 @@ class event {
             ipc::error("fail shm::acquire: %s\n", n.c_str());
             return;
         }
-        if (cnt_->fetch_add(1, std::memory_order_acq_rel) == 0) {
-            sem_ = semaphore::open(n.c_str());
-        }
-    }
-
-    void close() {
-        semaphore::close(sem_);
-        if (cnt_->fetch_sub(1, std::memory_order_acq_rel) == 1) {
-            semaphore::destroy(name().c_str());
-        }
-        shm::release(cnt_, sizeof(std::atomic<std::size_t>));
-    }
-
-public:
-    event(std::size_t id)
-        : wait_id_(static_cast<uint_t<16>>(id)) {
-        open();
+        cnt_->fetch_add(1, std::memory_order_acquire);
+        sem_ = semaphore::open(n.c_str());
     }
 
     ~event() {
-        close();
+        semaphore::close(sem_);
+        if (cnt_->fetch_sub(1, std::memory_order_release) == 1) {
+            semaphore::destroy(name().c_str());
+        }
+        shm::release(cnt_, sizeof(std::atomic<std::size_t>));
     }
 
     auto get_id() const noexcept {
@@ -321,8 +194,7 @@ public:
         IPC_UNUSED_ auto guard = ipc::detail::unique_lock(evt_lc_);
         evt_ids_.for_acquired([this](auto id) {
             event evt { *static_cast<evt_id_t*>(evt_ids_.at(id)) };
-            evt.notify();
-            return false; // return first
+            return !evt.notify(); // return if succ
         });
     }
 
diff --git a/test/test_waiter.cpp b/test/test_waiter.cpp
new file mode 100644
index 0000000..5376c02
--- /dev/null
+++ b/test/test_waiter.cpp
@@ -0,0 +1,46 @@
+#include <thread>
+
+#include "platform/waiter_wrapper.h"
+#include "test.h"
+
+namespace {
+
+class Unit : public TestSuite {
+    Q_OBJECT
+
+    const char* name() const {
+        return "test_waiter";
+    }
+
+private slots:
+    void test_wakeup();
+} unit__;
+
+#include "test_waiter.moc"
+
+void Unit::test_wakeup() {
+    ipc::detail::waiter w;
+
+    std::thread t1 {[&w] {
+        ipc::detail::waiter_wrapper wp { &w };
+        QVERIFY(wp.open("test-ipc-waiter"));
+        QVERIFY(wp.wait());
+    }};
+
+    std::thread t2 {[&w] {
+        ipc::detail::waiter_wrapper wp { &w };
+        QVERIFY(wp.open("test-ipc-waiter"));
+        QVERIFY(wp.wait());
+    }};
+
+    ipc::detail::waiter_wrapper wp { &w };
+    QVERIFY(wp.open("test-ipc-waiter"));
+
+    std::this_thread::sleep_for(std::chrono::seconds(1));
+    QVERIFY(wp.broadcast());
+
+    t1.join();
+    t2.join();
+}
+
+} // internal-linkage