startThread() — netty Function Reference

Architecture documentation for the startThread() function in GlobalEventExecutor.java from the netty codebase.

Function java CommonUtil Concurrent calls 3 called by 2

Entity Profile

CommonUtil→ Concurrent→ startThread() — netty Function Reference

Dependency Diagram

graph TD
  31f472df_5417_844a_9cd1_9eddb4104927["startThread()"]
  408381e8_b0ab_c53d_3b6c_8d8a15aaa884["GlobalEventExecutor"]
  31f472df_5417_844a_9cd1_9eddb4104927 -->|defined in| 408381e8_b0ab_c53d_3b6c_8d8a15aaa884
  48cb8185_67c7_dc1b_0fe4_537c9eb85449["execute0()"]
  48cb8185_67c7_dc1b_0fe4_537c9eb85449 -->|calls| 31f472df_5417_844a_9cd1_9eddb4104927
  9f953b79_2e4a_57b7_6141_d89c69f7af26["run()"]
  9f953b79_2e4a_57b7_6141_d89c69f7af26 -->|calls| 31f472df_5417_844a_9cd1_9eddb4104927
  9f953b79_2e4a_57b7_6141_d89c69f7af26["run()"]
  31f472df_5417_844a_9cd1_9eddb4104927 -->|calls| 9f953b79_2e4a_57b7_6141_d89c69f7af26
  72fdbb93_fa1b_91b4_c12e_dc06d2a5f63d["setContextClassLoader()"]
  31f472df_5417_844a_9cd1_9eddb4104927 -->|calls| 72fdbb93_fa1b_91b4_c12e_dc06d2a5f63d
  8c3d26d7_9eb5_8b59_29b5_6800113feb3c["inEventLoop()"]
  31f472df_5417_844a_9cd1_9eddb4104927 -->|calls| 8c3d26d7_9eb5_8b59_29b5_6800113feb3c
  style 31f472df_5417_844a_9cd1_9eddb4104927 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

common/src/main/java/io/netty/util/concurrent/GlobalEventExecutor.java lines 238–267

    private void startThread() {
        if (started.compareAndSet(false, true)) {
            final Thread callingThread = Thread.currentThread();
            ClassLoader parentCCL = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
                @Override
                public ClassLoader run() {
                    return callingThread.getContextClassLoader();
                }
            });
            // Avoid calling classloader leaking through Thread.inheritedAccessControlContext.
            setContextClassLoader(callingThread, null);
            try {
                final Thread t = threadFactory.newThread(taskRunner);
                // Set to null to ensure we not create classloader leaks by holds a strong reference to the inherited
                // classloader.
                // See:
                // - https://github.com/netty/netty/issues/7290
                // - https://bugs.openjdk.java.net/browse/JDK-7008595
                setContextClassLoader(t, null);

                // Set the thread before starting it as otherwise inEventLoop() may return false and so produce
                // an assert error.
                // See https://github.com/netty/netty/issues/4357
                thread = t;
                t.start();
            } finally {
                setContextClassLoader(callingThread, parentCCL);
            }
        }
    }