memory. ○ In C++, we have these available, and they are known as ‘mutexes’ ● A mutex, allows ‘mutual exclusion’ to a block of code. ○ Thus, the operation is ‘atomic’ in the sense that only 1 operation me! 77std::mutex and mutual exclusion (1/4) ● So what our lock is doing is providing access to only one thread at a time (mutually exclusive access). 78std::mutex and mutual exclusion (2/4) ● So want one thread at a time to enter and modify the shared state in the program. 79std::mutex and mutual exclusion (3/4) ● So what our lock is doing is providing access to only one thread at a time (mutually

communicating components whose interaction is based on precisely defined specifications of the mutual obligations — contracts.” —Building bug-free O-O software: An Introduction to Design by Contract™ communicating components whose interaction is based on precisely defined specifications of the mutual obligations — contracts.” —Building bug-free O-O software: An Introduction to Design by Contract™ communicating components whose interaction is based on precisely defined specifications of the mutual obligations — contracts.” —Building bug-free O-O software: An Introduction to Design by Contract™

formulated as recursive calculations. Interesting variations often include mutual recursion. Interesting variations often include mutual recursion. The most common inhibitor of recursive beauty is mixed up

Relatively simple structures (“Flat” structures) called “flats” • No pointers • use offsets • No mutual references • Field types • Char, various integers, various reals/floats • Optional, variant, array

mtx.unlock(); // Now go! threadB.join(); printf("Hello again from A\n"); 15 mutex is a mutual exclusion mechanism. I like to compare it to a coffeeshop bathroom key. When Alice holds the

81synchronization mechanism for linked data structures frequently read, but seldom updated not provide mutual exclusion user to schedule specified actions P2545 Read-Copy Update 82single-writer multi-reader

durable_goods, long_term_debts);CppCon 2023 74 David Olsen - Back to Basics: Concurrency MUTEXES MUTual EXclusion Most basic form of synchronization Only one thread at a time can lock or acquire the

的程序代码的「执行事实」。系统也是以一个特定的数据结构（Thread Database，TDB）记 录执行线程的所有相关资料，包括执行线程区域储存空间（Thread Local Storage，TLS）、讯 息队列、handle 表格、地址空间（Memory Context ）等等等。 最初，进程是以一个执行线程（称为主执行线程，primary thread）做为开始。如果需要，行 程可以 TerminateThread 结束某个执行线程 TlsAlloc 配置一个TLS（Thread Local Storage） TlsFree 释放一个TLS（Thread Local Storage） TlsGetValue 取得某个TLS（Thread Local Storage）的内容 TlsSetValue 设定某个TLS（Thread Local Storage）的内容 WaitForInputIdle Windows 系统提供四种同步化机制，帮助程序进行这种工作： 1. Critical Section（关键区域） 2. Semaphore（号志） 3. Event（事件） 4. Mutex（Mutual Exclusive，互斥器） MFC 也提供了四个对应的类别： 一想到本书的厚度，我就打消介绍同步机制的念头了。你可以在许多Visual C++ 或MFC 程序设计书籍中得到这个主题的知识。

prev* data frame* instr* keep drop TLS magic* process_fileWalking the stack CPU ret* prev* frame* ret* prev* data ret* prev* data frame* instr* keep drop TLS magic* process_fileWalking the stack data ret* prev* data frame* instr* keep drop TLS magic* process_fileWalking the stack CPU ret* prev* ret* prev* data frame* instr* drop TLS magic* keep frame*Walking the stack CPU ret* ret* prev* ret* prev* data frame* instr* drop TLS magic* keep frame*Walking the stack CPU ret* prev* ret* prev* data frame* instr* drop TLS magic* keep ? inject…thunk frame*Walking the stack

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