vlink::SpinLock类 参考

Adaptive spin lock satisfying the C++ Lockable named requirement. 更多...

#include <spin_lock.h>

vlink::SpinLock 的协作图:

Public 成员函数
	SpinLock () noexcept=default
	Constructs an unlocked spin lock. 更多...
	~SpinLock () noexcept=default
	Destructor. Assumes the lock has already been released. 更多...
void	lock () noexcept
	Acquires the lock, spinning with adaptive back-off until it becomes free. 更多...
bool	try_lock () noexcept
	Attempts a single non-blocking acquire of the lock. 更多...
void	unlock () noexcept
	Releases the lock with memory_order_release. 更多...

详细描述

Adaptive spin lock satisfying the C++ Lockable named requirement.

Cache-line aligned through alignas(64) to prevent false sharing. Composes with std::lock_guard, std::unique_lock and the supplied SpinLockGuard.

构造及析构函数说明

SpinLock()

vlink::SpinLock::SpinLock ( )

defaultnoexcept

Constructs an unlocked spin lock.

~SpinLock()

vlink::SpinLock::~SpinLock ( )

defaultnoexcept

Destructor. Assumes the lock has already been released.

成员函数说明

lock()

void vlink::SpinLock::lock ( )

inlinenoexcept

Acquires the lock, spinning with adaptive back-off until it becomes free.

Details

The inner loop alternates exchange attempts with relaxed-load spins. Each back-off rung doubles the spin budget from 8 up to 1024 then yields the CPU. After 50000 spins the back-off action switches to a 10 us sleep and a one-time warning is emitted.

警告

Recursive acquisition by the same thread deadlocks the lock.

函数调用图:

try_lock()

bool vlink::SpinLock::try_lock ( )

inlinenoexcept

Attempts a single non-blocking acquire of the lock.

返回

true when the lock was successfully acquired.

unlock()

void vlink::SpinLock::unlock ( )

inlinenoexcept

Releases the lock with memory_order_release.

May only be called by the thread that currently owns the lock.

这是这个函数的调用关系图:

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该类的文档由以下文件生成:

• include/vlink/base/spin_lock.h