Android C++ thread

如何创建和管理线程？

答案：在 Android C 中，可以使用 pthread 库来创建和管理线程。使用 pthread_create() 函数创建线程，使用 pthread_join() 函数等待线程结束并回收资源，使用 pthread_cancel() 函数取消线程的执行。同时，还可以使用互斥锁和条件变量来实现线程间的同步和通信。

相关问题

android的c++类Thread的源码

以下是Android中C++类Thread的部分源码，具体实现可以在Android源码中的`frameworks/native/libs/nativebase/include/utils/Thread.h`文件中找到：

class Thread : public Runnable {
public:
    Thread();
    virtual ~Thread();

    // Launch a new thread to execute the runnable object.
    virtual status_t    run(const char* name = 0, int32_t priority = PRIORITY_DEFAULT,
                            size_t stack = 0);

    // Ask the currently running thread to stop. This is called from a different thread.
    virtual status_t    requestExitAndWait();

    // Ask the currently running thread to stop. This is called from within the thread to be stopped.
    virtual status_t    requestExit();

    // Good place to do one-time initializations.
    virtual bool        threadLoop() = 0;

    // Return the thread's name.
    virtual const char* name() const;

    // Return the thread's priority.
    virtual int32_t     getPriority() const;

    // Set the thread's priority.
    virtual status_t    setPriority(int32_t priority);

    // Set the thread's scheduling policy.
    virtual status_t    setSchedulingPolicy(int32_t policy);

    // Get the thread's scheduling policy.
    virtual int32_t     getSchedulingPolicy() const;

    // Get the thread's unique identifier.
    virtual pid_t       getTid() const;

    // Sleeps for the specified number of milliseconds.
    static void         sleep(uint32_t ms);

protected:
    // Exit the thread.
    virtual void        onExit();

    // Called before the thread starts executing.
    virtual bool        readyToRun();

    // Return the thread's ID.
    pthread_t           id() const;

    // Return the thread's JNIEnv.
    JNIEnv*             env() const;

    // Return the thread's JavaVM.
    JavaVM*             javaVM() const;

private:
    class DeathRecipient : public IBinder::DeathRecipient {
    public:
        DeathRecipient(Thread* recipient) : mRecipient(recipient) {}
        virtual ~DeathRecipient() {}
        virtual void binderDied(const wp<IBinder>& who);
    private:
        wp<Thread> mRecipient;
    };

    static int          _threadLoop(void* user);
    int                 threadLoop();

    pthread_t           mThread;
    volatile bool       mRunning;
    volatile bool       mExited;
    bool                mNeedToExit;
    bool                mHasStarted;
    bool                mSuccessfullyStartedException;
    Mutex               mLock;
    Condition           mThreadExitedCondition;
    const char*         mName;
    int32_t             mPriority;
    size_t              mStackSize;
    pid_t               mTid;
    JavaVM*             mJavaVM;
    DeathRecipient*     mDeathRecipient;
};

android c++多线程

在 Android C++ 中使用多线程可以使用 pthread 库，以下是一个简单的示例代码：

#include <pthread.h>

void* myThread(void* arg) {
    // 线程执行的代码
    return nullptr;
}

int main() {
    // 创建线程
    pthread_t thread;
    pthread_create(&thread, nullptr, myThread, nullptr);

    // 等待线程结束
    pthread_join(thread, nullptr);

    return 0;
}

在上面的示例中，`pthread_create` 函数用于创建一个新的线程，并将其绑定到 `myThread` 函数上。`pthread_join` 函数用于等待线程结束，保证在主线程结束前，子线程已经执行完毕。

需要注意的是，在多线程编程中，需要注意线程安全性，避免出现数据竞争等问题。同时也需要考虑线程的优先级、同步机制等问题。