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//
// System.Threading.Semaphore.cs
//
// Author:
// Sebastien Pouliot <sebastien@ximian.com>
//
// Copyright (C) 2005 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if NET_2_0
using System.Runtime.ConstrainedExecution;
using System.Runtime.InteropServices;
using System.Security.AccessControl;
using System.Runtime.CompilerServices;
using System.IO;
namespace System.Threading {
[ComVisible (false)]
public sealed class Semaphore : WaitHandle {
#if !TARGET_JVM
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private static extern IntPtr CreateSemaphore_internal (
int initialCount, int maximumCount, string name,
out bool createdNew);
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private static extern int ReleaseSemaphore_internal (
IntPtr handle, int releaseCount, out bool fail);
[MethodImplAttribute (MethodImplOptions.InternalCall)]
private static extern IntPtr OpenSemaphore_internal (string name, SemaphoreRights rights, out MonoIOError error);
#endif
private Semaphore (IntPtr handle)
{
Handle = handle;
}
public Semaphore (int initialCount, int maximumCount)
: this (initialCount, maximumCount, null)
{
}
public Semaphore (int initialCount, int maximumCount, string name)
{
if (initialCount < 0)
throw new ArgumentOutOfRangeException ("initialCount", "< 0");
if (maximumCount < 1)
throw new ArgumentOutOfRangeException ("maximumCount", "< 1");
if (initialCount > maximumCount)
throw new ArgumentException ("initialCount > maximumCount");
bool created;
Handle = CreateSemaphore_internal (initialCount,
maximumCount, name,
out created);
}
public Semaphore (int initialCount, int maximumCount, string name, out bool createdNew)
: this (initialCount, maximumCount, name, out createdNew, null)
{
}
[MonoTODO ("Does not support access control, semaphoreSecurity is ignored")]
public Semaphore (int initialCount, int maximumCount, string name, out bool createdNew,
SemaphoreSecurity semaphoreSecurity)
{
if (initialCount < 0)
throw new ArgumentOutOfRangeException ("initialCount", "< 0");
if (maximumCount < 1)
throw new ArgumentOutOfRangeException ("maximumCount", "< 1");
if (initialCount > maximumCount)
throw new ArgumentException ("initialCount > maximumCount");
Handle = CreateSemaphore_internal (initialCount,
maximumCount, name,
out createdNew);
}
[MonoTODO]
public SemaphoreSecurity GetAccessControl ()
{
throw new NotImplementedException ();
}
[PrePrepareMethod]
[ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
public int Release ()
{
return (Release (1));
}
[ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
public int Release (int releaseCount)
{
#if TARGET_JVM
throw new NotImplementedException ();
#else
if (releaseCount < 1)
throw new ArgumentOutOfRangeException ("releaseCount");
int ret;
bool fail;
ret = ReleaseSemaphore_internal (Handle, releaseCount,
out fail);
if (fail) {
throw new SemaphoreFullException ();
}
return (ret);
#endif
}
[MonoTODO]
public void SetAccessControl (SemaphoreSecurity semaphoreSecurity)
{
if (semaphoreSecurity == null)
throw new ArgumentNullException ("semaphoreSecurity");
throw new NotImplementedException ();
}
// static methods
public static Semaphore OpenExisting (string name)
{
return OpenExisting (name, SemaphoreRights.Synchronize | SemaphoreRights.Modify);
}
public static Semaphore OpenExisting (string name, SemaphoreRights rights)
{
if (name == null)
throw new ArgumentNullException ("name");
if ((name.Length ==0) || (name.Length > 260))
throw new ArgumentException ("name", Locale.GetText ("Invalid length [1-260]."));
#if !TARGET_JVM
MonoIOError error;
IntPtr handle = OpenSemaphore_internal (name, rights,
out error);
if (handle == (IntPtr)null) {
if (error == MonoIOError.ERROR_FILE_NOT_FOUND) {
throw new WaitHandleCannotBeOpenedException (Locale.GetText ("Named Semaphore handle does not exist: ") + name);
} else if (error == MonoIOError.ERROR_ACCESS_DENIED) {
throw new UnauthorizedAccessException ();
} else {
throw new IOException (Locale.GetText ("Win32 IO error: ") + error.ToString ());
}
}
return(new Semaphore (handle));
#else
return null;
#endif
}
}
}
#endif
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