boost::interprocess::named_mutex named_mtx(boost::interprocess::open_or_create, "mtx"); boost::interprocess::named_condition named_cnd(boost::interprocess::open_or_create, "cnd"); boost::interprocess::scoped_lock<boost::interprocess::named_mutex> lock(named_mtx); while (*i < 10) { if ...
GreenPlum/PostgreSQL中有很多Latch以帮助多进程以及主线程与从线程之间协作。那么Latch是如何实现的呢？
boost::interprocess::named_mutex named_mtx(boost::interprocess::open_or_create, "mtx"); boost::interprocess::named_condition named_cnd(boost::interprocess::open_or_create, "cnd"); boost::interprocess::scoped_lock<boost::interprocess::named_mutex> lock(named_mtx); while (*i < 10) { if ...
Condition variables (named and anonymous) Semaphores (named and anonymous) Upgradable mutexes File locks Mutex 互斥锁(Mutex)代表着互斥,它是进程之间同步的最基本形式。互斥锁保证只有一个线程可以锁定给定的互斥锁。如果一段代码被互斥锁的锁定和解锁所包围,那么就可以保证一次只有一个线程执行该段代码。当该线程...
Example 33.14 uses a condition variable of type boost::interprocess::named_condition, which is defined in boost/interprocess/sync/named_condition.hpp. Because it is a named variable, it does not need to be stored in shared memory. The application uses a while loop to increment a variable of...
>::type condition; 前面说了predicate为一个lambda表达式. 简单的说就是之前的unwrap_predicate不是void*,则判断当前Argument(A0)能否转换成unwrap_predicate<void(T)>里面的T,结果保存到condition,这里就可以看出predicate的代码有些啰嗦,为什么非要搞个回调来绕一下,连lambda都用上了. ...
当中用蓝色标记出的部分（layout, local_size_x, local_size_y, local_size_z, in）为keyword，斜体...
Boost C++ 应用开发秘籍第二版(全) 原文:annas-archive.org/md5/8a1821d22bcd421390c328e6f1d92500 译者:飞龙 协议:CC BY-NC-SA 4.0 前言 如果您想充分利用 Boost 和 C++的真正力量,并避免在不同情况下使用哪个库的
typedef ipcdetail::windows_named_mutex internal_mutex_type; #undef BOOST_INTERPROCESS_USE_WINDOWS #else typedef ipcdetail::shm_named_mutex internal_mutex_type; #endif But define BOOST_INTERPROCESS_USE_POSIX_SEMAPHORES, boost using the posix semaphore, deadlock are also possible. You should use pos...
不变量是对象运行时的性质,必须永远为真。也就是说,对象中的函数必须保有这些性质。不变量经常以pre-condition和post-condition的形式出现 Complexity Guaranteesare maximum limits on how long the execution of one of the valid expressions will take, or how much of various resources its computation will use...