66 lines
1.7 KiB
C#
66 lines
1.7 KiB
C#
namespace PerfectNumbers.Core.Gpu;
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public static class GpuWorkLimiter
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{
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private static SemaphoreSlim _semaphore = new(1, int.MaxValue);
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private static readonly object _lock = new();
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private static int _currentLimit = 1;
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public static Lease Acquire()
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{
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// TODO: Replace the per-call Releaser allocation with the pooled struct-based guard from the
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// GpuLimiterThroughputBenchmarks so limiter acquisition does not allocate when we enter the
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// GPU scanning hot path.
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var sem = _semaphore;
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sem.Wait();
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return new Lease(sem);
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}
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public static void SetLimit(int value)
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{
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if (value < 1)
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{
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value = 1;
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}
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lock (_lock)
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{
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if (value == _currentLimit)
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{
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return;
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}
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// Swap to a new semaphore for the new limit. We intentionally
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// do not dispose the old semaphore to avoid releasing handles
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// that may still be in use by existing Releaser instances.
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// TODO: Consolidate with GpuPrimeWorkLimiter so both limiters share a pooled SemaphoreSlim and avoid rebuilding the
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// limiter state whenever limits are adjusted from the CLI.
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_semaphore = new SemaphoreSlim(value, value);
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_currentLimit = value;
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}
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}
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public sealed class Lease
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{
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private readonly SemaphoreSlim _sem;
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private bool _disposed;
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public Lease(SemaphoreSlim sem)
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{
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_sem = sem;
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}
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public void Dispose()
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{
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if (_disposed)
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{
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return;
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}
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_sem.Release();
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_disposed = true;
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}
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}
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}
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