David Benjamin
76919dabe6
This removes the goofy sizeof/alignof assertion we've been making. That was a strict aliasing violation. Now CRYPTO_refcount_t is just CRYPTO_atomic_u32 without any fuss. It also means nothing should include <openssl/thread.h> because it contains only deprecated symbols. Bug: 412269080 Change-Id: Icbf98a31d5af2a4dadab3b20a410c10f98061ed7 Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/79569 Reviewed-by: Adam Langley <agl@google.com> Commit-Queue: David Benjamin <davidben@google.com> Auto-Submit: David Benjamin <davidben@google.com>
49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
// Copyright 2015 The BoringSSL Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "internal.h"
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#include <assert.h>
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#include <stdlib.h>
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void CRYPTO_refcount_inc(CRYPTO_refcount_t *count) {
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uint32_t expected = CRYPTO_atomic_load_u32(count);
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while (expected != CRYPTO_REFCOUNT_MAX) {
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uint32_t new_value = expected + 1;
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if (CRYPTO_atomic_compare_exchange_weak_u32(count, &expected, new_value)) {
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break;
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}
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}
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}
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int CRYPTO_refcount_dec_and_test_zero(CRYPTO_refcount_t *count) {
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uint32_t expected = CRYPTO_atomic_load_u32(count);
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for (;;) {
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if (expected == 0) {
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abort();
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} else if (expected == CRYPTO_REFCOUNT_MAX) {
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return 0;
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} else {
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const uint32_t new_value = expected - 1;
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if (CRYPTO_atomic_compare_exchange_weak_u32(count, &expected,
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new_value)) {
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return new_value == 0;
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}
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}
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}
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}
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