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// Copyright 2015 The BoringSSL Authors
//
// Licensed 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
//
// https://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 "internal.h"
#include <assert.h>
#include <stdlib.h>
using namespace bssl;
void bssl::CRYPTO_refcount_inc(CRYPTO_refcount_t *count) {
uint32_t expected = count->load();
while (expected != CRYPTO_REFCOUNT_MAX) {
uint32_t new_value = expected + 1;
if (count->compare_exchange_weak(expected, new_value)) {
break;
}
}
}
int bssl::CRYPTO_refcount_dec_and_test_zero(CRYPTO_refcount_t *count) {
uint32_t expected = count->load();
for (;;) {
if (expected == 0) {
abort();
} else if (expected == CRYPTO_REFCOUNT_MAX) {
return 0;
} else {
const uint32_t new_value = expected - 1;
if (count->compare_exchange_weak(expected, new_value)) {
return new_value == 0;
}
}
}
}
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