CMakeLists.txt 添加Boost库

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Demo描述：使用boost::mutex 锁机制，打印两个线程的输出。

源码如下：

#include <iostream>#include <boost/thread/thread.hpp> 
#include <boost/thread/mutex.hpp> boost::mutex mutex;void print_block(int n, char c)
{// critical section (exclusive access to std::cout signaled by locking mtx):mutex.lock();for (int i = 0; i < n; ++i){std::cout << c;}std::cout << '\n';mutex.unlock();
}int main(int argc, char* argv[])
{boost::thread thread1(&print_block, 300, '*');boost::thread thread2(&print_block, 300, '$');thread1.join();thread2.join();return 0;
}

CmakeLists.txt内容如下：

# cmake needs this line
cmake_minimum_required(VERSION 2.8)# Define project name
project(mutex_project)SET(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} "-std=c++11")## System dependencies are found with CMake's conventions
find_package(Boost REQUIRED COMPONENTSthread
)if(NOT Boost_FOUND)message("NOT found Boost")
endif()include_directories(${Boost_INCLUDE_DIRS})
# Declare the executable target built from your sources
add_executable(${PROJECT_NAME} src/main.cpp)
target_link_libraries(${PROJECT_NAME} ${Boost_LIBRARIES})

执行输出：

------------------------------------------------------------------------更新-------------------------------------------------------------------------------------------

如果去除lock

void print_block(int n, char c)
{// critical section (exclusive access to std::cout signaled by locking mtx)://mutex.lock();for (int i = 0; i < n; ++i){std::cout << c;}std::cout << '\n';//mutex.unlock();
}

结果执行如下：

 

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