diff --git a/ThreadPool/build.gradle b/ThreadPool/build.gradle
new file mode 100644
index 0000000..8300af3
--- /dev/null
+++ b/ThreadPool/build.gradle
@@ -0,0 +1,15 @@
+group 'ru.ifmo'
+version '1.0-SNAPSHOT'
+
+apply plugin: 'java'
+
+sourceCompatibility = 1.8
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testCompile group: 'junit', name: 'junit', version: '4.12'
+    testCompile group: 'org.assertj', name: 'assertj-core', version: '3.9.0'
+}
diff --git a/ThreadPool/gradle/wrapper/gradle-wrapper.properties b/ThreadPool/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..b9d8cbd
--- /dev/null
+++ b/ThreadPool/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Sat Nov 10 18:12:31 MSK 2018
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.0-bin.zip
diff --git a/ThreadPool/gradlew b/ThreadPool/gradlew
new file mode 100755
index 0000000..cccdd3d
--- /dev/null
+++ b/ThreadPool/gradlew
@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"
diff --git a/ThreadPool/gradlew.bat b/ThreadPool/gradlew.bat
new file mode 100644
index 0000000..e95643d
--- /dev/null
+++ b/ThreadPool/gradlew.bat
@@ -0,0 +1,84 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/ThreadPool/settings.gradle b/ThreadPool/settings.gradle
new file mode 100644
index 0000000..64ea02f
--- /dev/null
+++ b/ThreadPool/settings.gradle
@@ -0,0 +1,2 @@
+rootProject.name = 'threadpool'
+
diff --git a/ThreadPool/src/main/java/ru/ifmo/threadpool/LightExecutionException.java b/ThreadPool/src/main/java/ru/ifmo/threadpool/LightExecutionException.java
new file mode 100644
index 0000000..7975036
--- /dev/null
+++ b/ThreadPool/src/main/java/ru/ifmo/threadpool/LightExecutionException.java
@@ -0,0 +1,9 @@
+package ru.ifmo.threadpool;
+
+public class LightExecutionException extends Exception {
+
+    LightExecutionException(Throwable throwable) {
+        super(throwable);
+    }
+
+}
diff --git a/ThreadPool/src/main/java/ru/ifmo/threadpool/LightFuture.java b/ThreadPool/src/main/java/ru/ifmo/threadpool/LightFuture.java
new file mode 100644
index 0000000..56c5a48
--- /dev/null
+++ b/ThreadPool/src/main/java/ru/ifmo/threadpool/LightFuture.java
@@ -0,0 +1,12 @@
+package ru.ifmo.threadpool;
+
+import java.util.function.Function;
+
+public interface LightFuture<R> {
+
+    boolean isReady();
+
+    R get() throws LightExecutionException;
+
+    <Y> LightFuture<Y> thenApply(Function<? super R, ? extends Y> function);
+}
diff --git a/ThreadPool/src/main/java/ru/ifmo/threadpool/ThreadPool.java b/ThreadPool/src/main/java/ru/ifmo/threadpool/ThreadPool.java
new file mode 100644
index 0000000..a67bd41
--- /dev/null
+++ b/ThreadPool/src/main/java/ru/ifmo/threadpool/ThreadPool.java
@@ -0,0 +1,11 @@
+package ru.ifmo.threadpool;
+
+import java.util.function.Supplier;
+
+public interface ThreadPool {
+
+    <R> LightFuture<R> submit(Supplier<R> supplier);
+
+    void shutdown();
+
+}
diff --git a/ThreadPool/src/main/java/ru/ifmo/threadpool/ThreadPoolImpl.java b/ThreadPool/src/main/java/ru/ifmo/threadpool/ThreadPoolImpl.java
new file mode 100644
index 0000000..14bed99
--- /dev/null
+++ b/ThreadPool/src/main/java/ru/ifmo/threadpool/ThreadPoolImpl.java
@@ -0,0 +1,144 @@
+package ru.ifmo.threadpool;
+
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Queue;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+public class ThreadPoolImpl implements ThreadPool {
+
+    private final List<Thread> threads = new ArrayList<>();
+
+    private volatile boolean isWorking;
+
+    private final Queue<LightFutureImpl> taskQueue = new LinkedList<>();
+
+    public ThreadPoolImpl(int threadsNumber) {
+        for (int i = 0; i < threadsNumber; i++) {
+            Thread thread = new Thread(new ThreadPoolWorker());
+            thread.start();
+            threads.add(thread);
+        }
+        isWorking = true;
+    }
+
+    @Override
+    public <R> LightFuture<R> submit(Supplier<R> supplier) {
+        if (!isWorking) {
+            return null;
+        }
+        LightFutureImpl<R> task = new LightFutureImpl<>(supplier);
+        synchronized (taskQueue) {
+            pushTaskToQueue(task);
+        }
+        return task;
+    }
+
+    @Override
+    public void shutdown() {
+        threads.forEach(Thread::interrupt);
+        for (Thread thread : threads) {
+            try {
+                thread.join();
+            } catch (InterruptedException ignored) {
+            }
+        }
+        isWorking = false;
+    }
+
+    private void pushTaskToQueue(LightFutureImpl task) {
+        synchronized (taskQueue) {
+            taskQueue.add(task);
+            taskQueue.notify();
+        }
+    }
+
+    private class LightFutureImpl<R> implements LightFuture<R>, Runnable {
+
+        private final Supplier<R> task;
+        private volatile boolean isReady = false;
+        private volatile R result = null;
+        private volatile LightExecutionException exception = null;
+        private List<LightFutureImpl> waitingTasks = new ArrayList<>();
+
+        private LightFutureImpl(Supplier<R> task) {
+            this.task = task;
+        }
+
+        @Override
+        public boolean isReady() {
+            return isReady;
+        }
+
+        @Override
+        public R get() throws LightExecutionException {
+            while (!isReady()) {
+                Thread.yield();
+            }
+            if (exception != null) {
+                throw exception;
+            }
+            return result;
+        }
+
+        @Override
+        public <Y> LightFuture<Y> thenApply(Function<? super R, ? extends Y> function) {
+            Supplier<Y> supplier = () -> {
+                try {
+                    return function.apply(this.get());
+                } catch (LightExecutionException e) {
+                    throw new RuntimeException(e.getMessage(), e.getCause());
+                }
+            };
+            LightFutureImpl<Y> nextTask = new LightFutureImpl<>(supplier);
+            synchronized (this) {
+                if (!isReady) {
+                    waitingTasks.add(nextTask);
+                } else {
+                    ThreadPoolImpl.this.pushTaskToQueue(nextTask);
+                }
+            }
+            return nextTask;
+        }
+
+        private synchronized void submitWaitingTasks() {
+            waitingTasks.forEach(ThreadPoolImpl.this::pushTaskToQueue);
+            waitingTasks.clear();
+        }
+
+        @Override
+        public void run() {
+            try {
+                result = task.get();
+            } catch (Exception e) {
+                exception = new LightExecutionException(e);
+            }
+            isReady = true;
+            submitWaitingTasks();
+        }
+    }
+
+    private class ThreadPoolWorker implements Runnable {
+
+        @Override
+        public void run() {
+            try {
+                while (!Thread.currentThread().isInterrupted()) {
+                    LightFutureImpl task;
+                    synchronized (taskQueue) {
+                        if (taskQueue.isEmpty()) {
+                            taskQueue.wait();
+                        }
+                        task = taskQueue.poll();
+                    }
+                    if (task != null) {
+                        task.run();
+                    }
+                }
+            } catch (InterruptedException ignored) {
+            }
+        }
+    }
+}
diff --git a/ThreadPool/src/test/java/ru/ifmo/threadpool/ThreadPoolImplTest.java b/ThreadPool/src/test/java/ru/ifmo/threadpool/ThreadPoolImplTest.java
new file mode 100644
index 0000000..245b71b
--- /dev/null
+++ b/ThreadPool/src/test/java/ru/ifmo/threadpool/ThreadPoolImplTest.java
@@ -0,0 +1,79 @@
+package ru.ifmo.threadpool;
+
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+
+
+public class ThreadPoolImplTest {
+
+    private final int threadNumber = 4;
+
+    @Test
+    public void TestCorrectThreadsNumber() {
+        int otherThreads = Thread.activeCount();
+        ThreadPool threadPool = new ThreadPoolImpl(threadNumber);
+        assertThat(Thread.activeCount() - otherThreads).isEqualTo(threadNumber);
+    }
+
+    @Test
+    public void testManyIndependentTasks() throws LightExecutionException {
+        ThreadPool threadPool = new ThreadPoolImpl(threadNumber);
+        List<LightFuture<Integer>> tasks = new ArrayList<>();
+        for (int i = 0; i < 1000; i++) {
+            final int j = i;
+            tasks.add(threadPool.submit(() -> j * j));
+        }
+        for (int i = 0; i < 1000; i++) {
+            assertThat(tasks.get(i).get()).isEqualTo(i * i);
+        }
+    }
+
+    @Test
+    public void testDependentTasksCorrectOrder() throws LightExecutionException {
+        ThreadPool threadPool = new ThreadPoolImpl(threadNumber);
+        List<LightFuture<Integer>> tasks = new ArrayList<>();
+        tasks.add(threadPool.submit(() -> 1));
+        for (int i = 1; i < 10; i++) {
+            tasks.add(tasks.get(i - 1).thenApply(k -> k * 2));
+        }
+        for (int i = 0; i < 10; i++) {
+            assertThat(tasks.get(i).get()).isEqualTo((int) Math.pow(2, i));
+        }
+    }
+
+    @Test
+    public void testDependentTasksReverseOrder() throws LightExecutionException {
+        ThreadPool threadPool = new ThreadPoolImpl(threadNumber);
+        List<LightFuture<Integer>> tasks = new ArrayList<>();
+        tasks.add(threadPool.submit(() -> 1));
+        for (int i = 1; i < 10; i++) {
+            tasks.add(tasks.get(i - 1).thenApply(k -> k * 2));
+        }
+        for (int i = 9; i >= 0; i--) {
+            assertThat(tasks.get(i).get()).isEqualTo((int) Math.pow(2, i));
+        }
+    }
+
+    @Test(expected = LightExecutionException.class)
+    public void testLightExecutionException() throws LightExecutionException {
+        ThreadPool threadPool = new ThreadPoolImpl(threadNumber);
+        LightFuture<Integer> task = threadPool.submit(() -> {
+            throw new RuntimeException("kek!");
+        });
+        task.get();
+    }
+
+    @Test
+    public void TestShutdown() {
+        int otherThreads = Thread.activeCount();
+        ThreadPool threadPool = new ThreadPoolImpl(threadNumber);
+        assertThat(Thread.activeCount() - otherThreads).isEqualTo(threadNumber);
+        threadPool.shutdown();
+        assertThat(Thread.activeCount()).isEqualTo(otherThreads);
+    }
+
+}