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Imported Upstream version 4.8.0.309
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//
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// System.Threading.Semaphore.cs
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//
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// Author:
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// Sebastien Pouliot <sebastien@ximian.com>
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//
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// Copyright (C) 2005 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Runtime.ConstrainedExecution;
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using System.Runtime.InteropServices;
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using System.Security.AccessControl;
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using System.Security.Permissions;
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using System.Runtime.CompilerServices;
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using System.IO;
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namespace System.Threading {
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[ComVisible (false)]
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public sealed class Semaphore : WaitHandle {
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[MethodImplAttribute(MethodImplOptions.InternalCall)]
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private static extern IntPtr CreateSemaphore_internal (
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int initialCount, int maximumCount, string name,
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out bool createdNew);
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[MethodImplAttribute(MethodImplOptions.InternalCall)]
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private static extern int ReleaseSemaphore_internal (
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IntPtr handle, int releaseCount, out bool fail);
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[MethodImplAttribute (MethodImplOptions.InternalCall)]
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private static extern IntPtr OpenSemaphore_internal (string name, SemaphoreRights rights, out MonoIOError error);
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private Semaphore (IntPtr handle)
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{
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Handle = handle;
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}
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public Semaphore (int initialCount, int maximumCount)
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: this (initialCount, maximumCount, null)
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{
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}
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public Semaphore (int initialCount, int maximumCount, string name)
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{
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if (initialCount < 0)
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throw new ArgumentOutOfRangeException ("initialCount", "< 0");
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if (maximumCount < 1)
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throw new ArgumentOutOfRangeException ("maximumCount", "< 1");
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if (initialCount > maximumCount)
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throw new ArgumentException ("initialCount > maximumCount");
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bool created;
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Handle = CreateSemaphore_internal (initialCount,
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maximumCount, name,
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out created);
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}
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public Semaphore (int initialCount, int maximumCount, string name, out bool createdNew)
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: this (initialCount, maximumCount, name, out createdNew, null)
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{
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}
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[MonoTODO ("CreateSemaphore_internal does not support access control, semaphoreSecurity is ignored")]
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public Semaphore (int initialCount, int maximumCount, string name, out bool createdNew,
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SemaphoreSecurity semaphoreSecurity)
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{
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if (initialCount < 0)
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throw new ArgumentOutOfRangeException ("initialCount", "< 0");
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if (maximumCount < 1)
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throw new ArgumentOutOfRangeException ("maximumCount", "< 1");
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if (initialCount > maximumCount)
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throw new ArgumentException ("initialCount > maximumCount");
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Handle = CreateSemaphore_internal (initialCount,
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maximumCount, name,
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out createdNew);
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}
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public SemaphoreSecurity GetAccessControl ()
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{
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return new SemaphoreSecurity (SafeWaitHandle,
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AccessControlSections.Owner |
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AccessControlSections.Group |
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AccessControlSections.Access);
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}
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[PrePrepareMethod]
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[ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
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public int Release ()
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{
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return (Release (1));
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}
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[ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
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public int Release (int releaseCount)
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{
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if (releaseCount < 1)
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throw new ArgumentOutOfRangeException ("releaseCount");
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int ret;
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bool fail;
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ret = ReleaseSemaphore_internal (Handle, releaseCount,
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out fail);
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if (fail) {
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throw new SemaphoreFullException ();
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}
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return (ret);
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}
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public void SetAccessControl (SemaphoreSecurity semaphoreSecurity)
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{
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if (semaphoreSecurity == null)
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throw new ArgumentNullException ("semaphoreSecurity");
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semaphoreSecurity.PersistModifications (SafeWaitHandle);
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}
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// static methods
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#if !MOBILE
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public static Semaphore OpenExisting (string name)
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{
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return OpenExisting (name, SemaphoreRights.Synchronize | SemaphoreRights.Modify);
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}
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public static Semaphore OpenExisting (string name, SemaphoreRights rights)
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{
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if (name == null)
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throw new ArgumentNullException ("name");
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if ((name.Length ==0) || (name.Length > 260))
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throw new ArgumentException ("name", Locale.GetText ("Invalid length [1-260]."));
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MonoIOError error;
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IntPtr handle = OpenSemaphore_internal (name, rights,
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out error);
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if (handle == (IntPtr)null) {
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if (error == MonoIOError.ERROR_FILE_NOT_FOUND) {
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throw new WaitHandleCannotBeOpenedException (Locale.GetText ("Named Semaphore handle does not exist: ") + name);
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} else if (error == MonoIOError.ERROR_ACCESS_DENIED) {
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throw new UnauthorizedAccessException ();
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} else {
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throw new IOException (Locale.GetText ("Win32 IO error: ") + error.ToString ());
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}
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}
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return(new Semaphore (handle));
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}
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[SecurityPermissionAttribute (SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
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public static bool TryOpenExisting (string name, out Semaphore result)
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{
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return TryOpenExisting (name, SemaphoreRights.Synchronize | SemaphoreRights.Modify, out result);
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}
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[SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
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public static bool TryOpenExisting (string name, SemaphoreRights rights, out Semaphore result)
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{
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if (name == null)
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throw new ArgumentNullException ("name");
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if ((name.Length == 0) || (name.Length > 260))
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throw new ArgumentException ("name", Locale.GetText ("Invalid length [1-260]."));
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MonoIOError error;
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IntPtr handle = OpenSemaphore_internal (name, rights, out error);
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if (handle == (IntPtr)null) {
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result = null;
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return false;
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}
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result = new Semaphore (handle);
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return true;
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}
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#else
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public static Semaphore OpenExisting (string name)
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{
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throw new NotSupportedException ();
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}
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public static Semaphore OpenExisting (string name, SemaphoreRights rights)
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{
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throw new NotSupportedException ();
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}
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public static bool TryOpenExisting (string name, out Semaphore result)
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{
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throw new NotSupportedException ();
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}
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public static bool TryOpenExisting (string name, SemaphoreRights rights, out Semaphore result)
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{
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throw new NotSupportedException ();
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}
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#endif
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}
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}
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