Jacques Lucke
c73ae711bf
This patch introduces a new `CacheMutex` which makes it easy to implement lazily computed caches in e.g. `Curves`. For more details see `BLI_cache_mutex.hh`. Differential Revision: https://developer.blender.org/D16419
26 lines
629 B
C++
26 lines
629 B
C++
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#include "BLI_cache_mutex.hh"
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#include "BLI_task.hh"
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namespace blender {
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void CacheMutex::ensure(const FunctionRef<void()> compute_cache)
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{
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if (cache_valid_.load(std::memory_order_acquire)) {
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return;
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}
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std::scoped_lock lock{mutex_};
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/* Double checked lock. */
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if (cache_valid_.load(std::memory_order_relaxed)) {
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return;
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}
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/* Use task isolation because a mutex is locked and the cache computation might use
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* multi-threading. */
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threading::isolate_task(compute_cache);
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cache_valid_.store(true, std::memory_order_release);
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}
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} // namespace blender
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