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thread/spinlock: don't try to lock during a move operation

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This commit is contained in:
Danny Robson 2019-05-24 11:47:19 +10:00
parent ec883c3009
commit 747cfa9237
2 changed files with 7 additions and 14 deletions
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7
thread/spinlock.cpp
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@ -30,14 +30,7 @@ spinlock::spinlock (spinlock &&rhs) noexcept:
//-----------------------------------------------------------------------------
spinlock& spinlock::operator= (spinlock &&rhs) noexcept
{
lock ();
rhs.lock ();
held = rhs.held.load ();
rhs.unlock ();
unlock ();
return *this;
}

14
thread/spinlock.hpp
View File

@ -3,22 +3,24 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Copyright 2018 Danny Robson <danny@nerdcruft.net>
* Copyright 2018-2019 Danny Robson <danny@nerdcruft.net>
*/
#ifndef CRUFT_UTIL_THREAD_SPINLOCK_HPP
#define CRUFT_UTIL_THREAD_SPINLOCK_HPP
#pragma once
#include <atomic>
namespace cruft::thread {
/// a CPU intensive, but lower latency, lock.
/// A CPU intensive, but lower latency, lock.
///
/// std::atomic_flag seems like it might have been a good option on which
/// to base our implementation, but it appears potentially expensive to
/// spin over without a cheap read operation.
///
/// satisfies BasicLockable.
/// Satisfies BasicLockable.
///
/// NOTE: All move operations assume that either the lock is held by the
/// client performing the move, or that is not held by any client.
class spinlock {
public:
spinlock ();
@ -40,5 +42,3 @@ namespace cruft::thread {
std::atomic<bool> held;
};
};
#endif