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 ${CMAKE_CXX_FLAGS} "-std=c++11")
## System dependencies are found with CMake's conventions
find_package(Boost REQUIRED COMPONENTS
thread
)
if(NOT Boost_FOUND)
message("NOT found Boost")
endif()
include_directories(${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:
来源:CSDN
作者:惜缘865
链接:https://blog.csdn.net/u011608180/article/details/103770401