| shixingya |
2022-09-30 10:19 |
【未解决】饿汉式单例开辟线程失败，求解原因
以下DEMO用VS2017编译，必现线程创建卡住，无下文。
VS2019、Ubuntu下编译，运行正常。 求解具体原因，是IDE的问题吗？
代码附在下面，也可从这里下载 https://github.com/shixingya/selfFileBed/raw/main/hungry_thread_create_in_singleton.zip
dllimpl.h
- #ifndef DLL_IMPL_H
#define DLL_IMPL_H
#include <iostream>
#include <mutex>
#include <thread>
#ifndef XTHREADPOOL_DLL
# ifdef _WIN32
# if defined( BUILD_DLL )
# define XTHREADPOOL_DLL __declspec(dllexport)
# elif defined( USE_DLL )
# define XTHREADPOOL_DLL __declspec(dllimport)
# else
# define XTHREADPOOL_DLL
# endif
# else
# define XTHREADPOOL_DLL
# endif
#endif
class XTHREADPOOL_DLL DLL_IMPL {
public:
DLL_IMPL() {
std::cout << __FUNCTION__ << " begin create subThread." << std::endl;
std::thread t1([]() {
std::cout << "subThread : Hello World" << std::endl;
});
t1.join();//这里也可以试试detach VS2019 detach运行正常/vs2017 detach运行异常
std::cout << __FUNCTION__ << " out" << std::endl;
}
};
using DLL_IMPL_Ptr = DLL_IMPL * ;
class XTHREADPOOL_DLL DLL_IMPLSingleton {
public:
static DLL_IMPL_Ptr get();
private:
static DLL_IMPL s_impl_;
};
#endif
- #include "dllImpl.h"
DLL_IMPL DLL_IMPLSingleton::s_impl_;
DLL_IMPL_Ptr DLL_IMPLSingleton::get() {
DLL_IMPL_Ptr ptr = &DLL_IMPLSingleton::s_impl_;
return ptr;
}
- #include <iostream>
#include "dllimpl.h"
int main(int argc, char* argv[]){
std::cout << " in main thread " << std::endl << std::flush;
DLL_IMPL imp;
std::cout <<"main thread "<<std::endl<< std::flush;
getchar();
return 0;
}
- # vs2017最高支持3.12
cmake_minimum_required(VERSION 3.10)
project (XThreadPool)
set(SHARED_LIB_SOURCES
src/dllimpl.cpp
)
set(EXE_SOURCES
test/main.cpp
)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
add_library(xthreadpool SHARED ${SHARED_LIB_SOURCES})
SET(CMAKE_CXX_FLAGS_DEBUG "$ENV{CXXFLAGS} -O0 -Wall -g -ggdb -std=c++17 -pthread")
SET(CMAKE_CXX_FLAGS_RELEASE "$ENV{CXXFLAGS} -O3 -Wall -std=c++17 -pthread")
set(CMAKE_CXX_FLAGS_RELEASE "/MT")
set(CMAKE_CXX_FLAGS_DEBUG "/MTd")
target_compile_definitions(xthreadpool PRIVATE BUILD_DLL )
target_include_directories(xthreadpool
PUBLIC ${PROJECT_SOURCE_DIR}/include
)
add_executable(test_xthreadpool ${EXE_SOURCES} )
target_compile_definitions( test_xthreadpool PRIVATE USE_DLL )
target_include_directories( test_xthreadpool
PRIVATE ${PROJECT_SOURCE_DIR}/include
${PROJECT_SOURCE_DIR}
)
target_link_libraries( test_xthreadpool
PRIVATE xthreadpool
)
#这行可以生成VS下sln工程
set_property ( DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY VS_STARTUP_PROJECT ${PROJECT_NAME} )
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