38 lines
1.1 KiB
C++
38 lines
1.1 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
|
|
// or more contributor license agreements. See the NOTICE file
|
|
// distributed with this work for additional information
|
|
// regarding copyright ownership. The ASF licenses this file
|
|
// to you under the Apache License, Version 2.0 (the
|
|
// "License"); you may not use this file except in compliance
|
|
// with the License. You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing,
|
|
// software distributed under the License is distributed on an
|
|
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
|
// KIND, either express or implied. See the License for the
|
|
// specific language governing permissions and limitations
|
|
// under the License.
|
|
|
|
#include "util/spinlock.h"
|
|
|
|
namespace doris {
|
|
|
|
void SpinLock::slow_acquire() {
|
|
while (true) {
|
|
if (try_lock()) {
|
|
return;
|
|
}
|
|
for (int i = 0; i < NUM_SPIN_CYCLES; ++i) {
|
|
AtomicUtil::cpu_wait();
|
|
}
|
|
if (try_lock()) {
|
|
return;
|
|
}
|
|
sched_yield();
|
|
}
|
|
}
|
|
|
|
} // end namespace doris
|