OpenSSL-多线程环境-C ++

Question

I'm using non-blocking sockets and OpenSSL 1.1.0 to create a simple web server.

The clients requests is handled inside 4 threads and the threads is created using C++ ( std::thread ).

My question is: Can we use the C++ threads to make OpenSSL thread safe for each client request?

I ask this because i have found this:

*) OpenSSL now uses a new threading API. It is no longer necessary to set locking callbacks to use OpenSSL in a multi-threaded environment. There are two supported threading models: pthreads and windows threads . It is also possible to configure OpenSSL at compile time for "no-threads". The old threading API should no longer be used. The functions have been replaced with "no-op" compatibility macros. [Alessandro Ghedini, Matt Caswell]

Answer 1

简而言之， 默认情况下， openssl 不是线程安全的 ，但是您可以使用一些带有锁（std :: lock_guard）的互斥锁（std :: lock_guard）或原子数据类型std :: atomic的锁机制，必须先设置一些回调，但是现在，我现在不记得了，请检查此锁定机制示例https://github.com/openssl/openssl/blob/OpenSSL_1_0_2-stable/crypto/threads/th-lock.c并阅读此文章，其中包含一些内容例如https://www.openssl.org/blog/blog/2017/02/21/threads/您可能会参与其中，成瘾我认为std :: thread在后台使用pthread，但它可以使用本机（取决于OS ）线程机制。