我想为循环计时器创建线程池：每n秒，我们将运行任务。
在我的示例中，我们有两个任务。对于每个任务，我将创建一个线程来运行。我为每个任务添加了状态条件，如果状态为false，我们什么也不做。我需要状态来控制计时器，我可以调用计时器的启动/停止（抱歉，在此代码中，只有启动功能）。
这是我的代码：
#include <iostream>
#include <list>
#include <functional>
#include <map>
#include <thread>
#include <chrono>
#include <vector>
#include <mutex>
//using namespace std::chrono_literals;
void print_time()
{
std::chrono::time_point<std::chrono::system_clock> now = std::chrono::system_clock::now();
std::chrono::system_clock::duration tp = now.time_since_epoch();
tp -= std::chrono::duration_cast<std::chrono::seconds>(tp);
std::time_t ttp = std::chrono::system_clock::to_time_t(now);
tm t = *gmtime(&ttp);
std::printf("[%04u-%02u-%02u %02u:%02u:%02u.%03u]: ", t.tm_year + 1900,
t.tm_mon + 1, t.tm_mday, t.tm_hour, t.tm_min, t.tm_sec,
static_cast<unsigned>(tp/std::chrono::milliseconds(1)));
}
typedef std::function<void()> Callback;
enum E_NUM {
NUM_ONE = 0,
NUM_TWO
};
class Foo {
public:
static Foo& getInstance()
{
static Foo instance;
return instance;
}
void init() {
m_mapThreadStatus[NUM_ONE] = false;
m_mapThreadStatus[NUM_TWO] = false;
m_mapCallback[NUM_ONE] = std::bind(&Foo::test, this);
m_mapCallback[NUM_TWO] = std::bind(&Foo::foo_test, this);
}
void addTimer(E_NUM id, int num_seconds) {
std::thread th ([id, num_seconds] () {
std::cout << std::this_thread::get_id() << " id: " << id << "\tseconds: " << num_seconds << std::endl;
while (1)
{
if ( Foo::getInstance().getStatus(id) == true)
{
Foo::getInstance().callfunctor(id);
std::this_thread::sleep_for(std::chrono::seconds(num_seconds));
}
else
{
}
//std::this_thread::sleep_for(std::chrono::seconds(num_seconds));
}
});
m_mapThreads[id] = std::move(th);
}
void callfunctor(E_NUM id) {
m_mapCallback[id]();
}
void startTimers(E_NUM id) {
m_mapThreadStatus[id] = true;
if (m_mapThreads[id].joinable())
{
m_mapThreads[id].join();
}
}
bool getStatus(E_NUM id) {
return m_mapThreadStatus[id];}
private:
void test() {
print_time();
std::cout << std::this_thread::get_id() << std::endl;
std::cout << "\033[1;31m" << __PRETTY_FUNCTION__ << "\033[0m" << std::endl;
}
void foo_test() {
print_time();
std::cout << std::this_thread::get_id() << std::endl;
std::cout << "\033[1;32m" << __PRETTY_FUNCTION__ << "\033[0m" << std::endl;
}
Foo() {init();}
std::map<E_NUM, Callback> m_mapCallback;
std::vector<std::thread> m_threads;
std::map<E_NUM, std::thread> m_mapThreads;
std::map<E_NUM, bool> m_mapThreadStatus;
};
int main()
{
Foo::getInstance().addTimer(NUM_ONE, 1);
Foo::getInstance().addTimer(NUM_TWO, 2);
Foo::getInstance().startTimers(NUM_ONE);
Foo::getInstance().startTimers(NUM_TWO);
return 0;
}
但是我的问题是： 1.似乎只有一项任务在运行，而不是预期的两项。
40557398533888 id: 0 seconds: 1140557390141184 id: 1 seconds: 2
[2019-05-28 11:56:49.770]: 140557398533888
void Foo::test()
[2019-05-28 11:56:50.770]: 140557398533888
void Foo::test()
[2019-05-28 11:56:51.771]: 140557398533888
void Foo::test()
[2019-05-28 11:56:52.771]: 140557398533888
void Foo::test()
[2019-05-28 11:56:53.772]: 140557398533888
void Foo::test()
我在Foo中添加了该功能：
class Foo {
...
void startTimers() {
m_mapThreads[NUM_ONE].join();
m_mapThreads[NUM_TWO].join();
}
};
我在main的END处调用此函数，它的作用就像是一个魅力。谢谢。
答案 0 :(得分：3)
考虑您的 <widget xmlns="http://www.w3.org/ns/widgets"
xmlns:gap="http://phonegap.com/ns/1.0"id="com.mitraye.earthinfosys"
version="6.5.0">
<name>Earth Infosys</name>
<description></description>
<description></description>
<author href="http://mitraye.com"
email="support@mitraye.com">Mitraye</author>
<content src="index.html"/>
<preference name="permissions" value="none"/>
<preference name="phonegap-version" value="cli-6.5.0" />
<preference name="orientation" value="default"/>
<preference name="target-device" value="universal"/>
<preference name="fullscreen" value="true"/>
<preference name="webviewbounce" value="true"/>
<preference name="prerendered-icon" value="true"/>
<preference name="stay-in-webview" value="false"/>
<preference name="ios-statusbarstyle" value="black-opaque"/>
<preference name="detect-data-types" value="true"/>
<preference name="exit-on-suspend" value="false"/>
<preference name="show-splash-screen-spinner" value="true"/>
<preference name="auto-hide-splash-screen" value="true"/>
<preference name="disable-cursor" value="false"/>
<preference name="windows-arch" value="anycpu" />
<preference name="android-minSdkVersion" value="20" />
<preference name="android-targetSdkVersion" value="28" />
<preference name="android-maxSdkVersion" value="28" />
<preference name="android-installLocation" value="auto"/>
<plugin name="cordova-plugin-battery-status" source="npm" spec="~1.1.1"/>
<plugin name="cordova-plugin-camera" source="npm" spec="~2.1.1"/>
<plugin name="cordova-plugin-media-capture" source="npm" spec="~1.2.0"/>
<plugin name="cordova-plugin-console" source="npm" spec="~1.0.2"/>
<plugin name="cordova-plugin-contacts" source="npm" spec="~2.0.1"/>
<plugin name="cordova-plugin-device" source="npm" spec="~1.1.1"/>
<plugin name="cordova-plugin-device-motion" source="npm" spec="~1.2.0"/>
<plugin name="cordova-plugin-device-orientation" source="npm"
spec="~1.0.2"/>
<plugin name="cordova-plugin-dialogs" source="npm" spec="~1.2.0"/>
<plugin name="cordova-plugin-file" source="npm" spec="~4.1.1"/>
<plugin name="cordova-plugin-native-spinner" source="npm" spec="~1.1.3"/>
<plugin name="cordova-plugin-file-transfer" source="npm" spec="~1.5.0"/>
<plugin name="cordova-plugin-geolocation" source="npm" spec="~2.1.0"/>
<plugin name="cordova-plugin-globalization" source="npm" spec="~1.0.3"/>
<plugin name="cordova-plugin-inappbrowser" source="npm" spec="~1.3.0"/>
<plugin name="cordova-plugin-media" source="npm" spec="~2.2.0"/>
<plugin name="cordova-plugin-network-information" source="npm"
spec="~1.2.0"/>
<plugin name="cordova-plugin-splashscreen" source="npm" spec="~3.2.1"/>
<plugin name="cordova-plugin-statusbar" source="npm" spec="~2.1.2"/>
<plugin name="cordova-plugin-vibration" source="npm" spec="~2.1.0"/>
<plugin name="cordova-plugin-whitelist" source="npm" spec="~1.2.1"/>
<access origin="*"/>
<allow-intent href="http://*/*"/>
<allow-intent href="https://*/*"/>
<allow-intent href="tel:*"/>
<allow-intent href="sms:*"/>
<allow-intent href="mailto:*"/>
<allow-intent href="geo:*"/>
<platform name="android">
<allow-intent href="market:*"/>
</platform>
<platform name="ios">
<allow-intent href="itms:*"/>
<allow-intent href="itms-apps:*"/>
</platform>
<icon src="icon.png"/>
<splash src="splash.png" />
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
</manifest>
<preference name="SplashScreenDelay" value="5000" />
<splash platform="android" qualifier="port-ldpi" src="res/android/screen-
ldpi-portrait.png" />
<splash platform="android" qualifier="port-mdpi" src="res/android/screen-
mdpi-portrait.png" />
<splash platform="android" qualifier="port-hdpi" src="res/android/screen-
hdpi-portrait.png" />
<splash platform="android" qualifier="port-xhdpi" src="res/android/screen-
xhdpi-portrait.png" />
</widget>
实施...
Foo::startTimers您void startTimers (E_NUM id)
{
m_mapThreadStatus[id] = true;
if (m_mapThreads[id].joinable()) {
m_mapThreads[id].join();
}
}
用... {p}标识的线程。
start但是您然后id那个线程。最终结果是，当您启动给定线程时，您的代码将阻塞，直到该线程完成为止。所以，有了...
m_mapThreadStatus[id] = true;
线路...
join将阻塞，直到与int main()
{
Foo::getInstance().addTimer(NUM_ONE, 1);
Foo::getInstance().addTimer(NUM_TWO, 2);
Foo::getInstance().startTimers(NUM_ONE);
Foo::getInstance().startTimers(NUM_TWO);
return 0;
}
关联的线程结束为止（在当前情况下永远不会），并且永远不会调用Foo::getInstance().startTimers(NUM_ONE);
。