在多线程C/C ++中，分配内存时malloc/new是否锁定堆 [英] In multithreaded C/C++, does malloc/new lock the heap when allocating memory

问题描述

我很好奇，如果两个线程同时请求分配内存，内存分配是否存在锁定.我正在使用OpenMP进行多线程C ++代码.

I'm curious as to whether there is a lock on memory allocation if two threads simultaneously request to allocate memory. I am using OpenMP to do multithreading, C++ code.

操作系统:主要是linux，但也想了解Windows和Mac.

OS's: mostly linux, but would like to know for Windows and Mac as well.

推荐答案

在某些实现中可能会有改进，例如创建特定于线程的缓存(在这种情况下，小块的分配将是无锁的).例如，来自Google的此.但是总的来说，是的，内存分配有锁.

There could be improvements in certain implementations, such as creating a thread-specific cache (in this case allocations of small blocks will be lock-free). For instance, this from Google. But in general, yes, there is a lock on memory allocations.

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