53 lines
1.6 KiB
C#
53 lines
1.6 KiB
C#
using System;
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using System.Runtime.CompilerServices;
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using System.Runtime.ConstrainedExecution;
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using System.Runtime.InteropServices;
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namespace Foodsoft.Alpm
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{
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internal sealed class SafeDatabaseHandle : SafeHandle
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{
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internal SafeAlpmHandle SafeAlpmHandle
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{
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[ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
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[PrePrepareMethod]
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get;
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} = null!; // we always throw in the constructor on failure
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[ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
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[PrePrepareMethod]
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internal SafeDatabaseHandle(IntPtr dbPtr, SafeAlpmHandle safeAlpmHandle)
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: base(IntPtr.Zero, true)
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{
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var success = false;
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RuntimeHelpers.PrepareConstrainedRegions();
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try { }
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finally
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{
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safeAlpmHandle.DangerousAddRef(ref success);
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if (success)
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{
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SafeAlpmHandle = safeAlpmHandle;
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handle = dbPtr;
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}
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}
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if (!success) throw new ObjectDisposedException(GetType().FullName);
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}
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[ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail), PrePrepareMethod]
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protected override bool ReleaseHandle()
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{
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var ret = alpm.alpm_db_unregister(handle) == 0;
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SafeAlpmHandle.DangerousRelease();
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return ret;
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}
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public override bool IsInvalid
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{
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[ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success), PrePrepareMethod]
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get => handle == IntPtr.Zero;
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}
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}
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} |