有没有改善这种自旋锁功能的性能有任何简单的方法？ [英] Is there any simple way to improve performance of this spinlock function?

问题描述

我想实现我的code自旋锁，但我根据维基百科的结果极其缓慢的性能实现了自旋锁。

I'm trying to implement a spinlock in my code but the spinlock that I implemented based on Wikipedia results in extremely slow performance.

int lockValue = 0;

void lock() {
    __asm__("loop: \n\t"
            "movl $1, %eax \n\t"
            "xchg %eax, lockValue \n\t"
            "test %eax, %eax \n\t"
            "jnz loop");
}

有没有改进这个问题的任何方式，使其更快？

Is there any way of improving this to make it faster?

感谢。

推荐答案

如何像这样（我的理解，这是KeAcquireSpinLock实现）。我在与安培; T汇编薄弱不幸

How about something like this (I understand this is the KeAcquireSpinLock implementation). My at&t assembly is weak unfortunately.

spin_lock:
    rep; nop
    test lockValue, 1
    jnz spin_lock
    lock bts lockValue
    jc spin_lock

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