mcs/class/System.Core/Test/System.IO.MemoryMappedFiles/MemoryMappedFileTest.cs

   1 //
   2 // MemoryMappedFileTest.cs
   3 //
   4 // Author:
   5 //   Zoltan Varga (vargaz@gmail.com)
   6 //
   7 // (C) 2009 Novell, Inc. (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 #if NET_4_0
  30
  31 using System;
  32 using System.IO;
  33 using System.IO.MemoryMappedFiles;
  34 using System.Linq;
  35
  36 using NUnit.Framework;
  37
  38 namespace MonoTests.System.IO.MemoryMappedFiles {
  39
  40         [TestFixture]
  41         public class MemoryMappedFileTest {
  42
  43                 void AssertThrows<ExType> (Action del) where ExType : Exception {
  44                         bool thrown = false;
  45
  46                         try {
  47                                 del ();
  48                         } catch (ExType) {
  49                                 thrown = true;
  50                         }
  51                         Assert.IsTrue (thrown);
  52                 }
  53
  54                 static int named_index;
  55                 static String MkNamedMapping ()
  56                 {
  57                         return "test-" + named_index++;
  58                 }
  59
  60
  61                 static string tempDir = Path.Combine (Path.GetTempPath (), typeof (MemoryMappedFileTest).FullName);
  62
  63                 string fname;
  64
  65                 [SetUp]
  66                 protected void SetUp () {
  67                         if (Directory.Exists (tempDir))
  68                                 Directory.Delete (tempDir, true);
  69
  70                         Directory.CreateDirectory (tempDir);
  71
  72                         fname = Path.Combine (tempDir, "basic.txt");
  73
  74                         using (StreamWriter sw = new StreamWriter (fname)) {
  75                                 sw.WriteLine ("Hello!");
  76                                 sw.WriteLine ("World!");
  77                         }
  78                 }
  79
  80                 [TearDown]
  81                 protected void TearDown () {
  82                         if (Directory.Exists (tempDir))
  83                                 Directory.Delete (tempDir, true);
  84                 }
  85
  86                 [Test]
  87                 public void Basic () {
  88                         var file = MemoryMappedFile.CreateFromFile (fname, FileMode.Open);
  89
  90                         using (var stream = file.CreateViewStream ()) {
  91                                 TextReader r = new StreamReader (stream);
  92
  93                                 string s;
  94
  95                                 s = r.ReadLine ();
  96                                 Assert.AreEqual ("Hello!", s);
  97                                 s = r.ReadLine ();
  98                                 Assert.AreEqual ("World!", s);
  99                         }
 100                 }
 101
 102                 [Test]
 103                 public void CreateNew ()
 104                 {
 105                         // This must succeed
 106                         MemoryMappedFile.CreateNew (Path.Combine (tempDir, "createNew.test"), 8192);
 107                 }
 108
 109                 [Test]
 110                 [ExpectedException (typeof (IOException))]
 111                 public void CreateNew_OnExistingFile ()
 112                 {
 113                         // This must succeed
 114                         MemoryMappedFile.CreateNew (Path.Combine (tempDir, "createNew.test"), 8192);
 115
 116                         // This should fail, the file exists
 117                         MemoryMappedFile.CreateNew (Path.Combine (tempDir, "createNew.test"), 8192);
 118                 }
 119
 120                 // Call this twice, it should always work
 121                 [Test]
 122                 public void CreateOrOpen_Multiple ()
 123                 {
 124                         MemoryMappedFile.CreateOrOpen (Path.Combine (tempDir, "createOrOpen.test"), 8192);
 125                         MemoryMappedFile.CreateOrOpen (Path.Combine (tempDir, "createOrOpen.test"), 8192);
 126                 }
 127
 128                 [Test]
 129                 [ExpectedException(typeof(ArgumentOutOfRangeException))]
 130                 public void CreateFromFileWithSmallerCapacityThanFile ()
 131                 {
 132                         var f = Path.Combine (tempDir, "8192-file");
 133                         File.WriteAllBytes (f, new byte [8192]);
 134
 135                         // We are requesting fewer bytes to map.
 136                         MemoryMappedFile.CreateFromFile (f, FileMode.Open, "myMap", 4192);
 137                 }
 138
 139                 [Test]
 140                 public void CreateFromFile_Null () {
 141                         AssertThrows<ArgumentNullException> (delegate () {
 142                                         MemoryMappedFile.CreateFromFile (null);
 143                                 });
 144                 }
 145
 146                 [Test]
 147                 public void CreateViewStream_Offsets () {
 148                         var file = MemoryMappedFile.CreateFromFile (fname, FileMode.Open);
 149
 150                         using (var stream = file.CreateViewStream (2, 3)) {
 151                                 byte[] arr = new byte [128];
 152
 153                                 int len = stream.Read (arr, 0, 128);
 154
 155                                 Assert.AreEqual (3, len);
 156
 157                                 Assert.AreEqual ('l', (char)arr [0]);
 158                                 Assert.AreEqual ('l', (char)arr [1]);
 159                                 Assert.AreEqual ('o', (char)arr [2]);
 160                         }
 161                 }
 162
 163                 [Test]
 164                 public void CreateViewStream_Rights () {
 165                         var file = MemoryMappedFile.CreateFromFile (fname, FileMode.Open);
 166
 167                         using (var stream = file.CreateViewStream (0, 0, MemoryMappedFileAccess.Read)) {
 168                                 AssertThrows<NotSupportedException> (delegate () {
 169                                                 stream.WriteByte (0);
 170                                         });
 171                         }
 172
 173                         using (var stream = file.CreateViewStream (0, 0, MemoryMappedFileAccess.Write)) {
 174                                 AssertThrows<NotSupportedException> (delegate () {
 175                                                 stream.ReadByte ();
 176                                         });
 177                         }
 178                 }
 179
 180                 [Test]
 181                 public unsafe void CreateViewBasic () {
 182                         var file = MemoryMappedFile.CreateFromFile (fname, FileMode.Open);
 183
 184                         using (var v = file.CreateViewAccessor ()) {
 185                                 string s = "";
 186
 187                                 // FIXME: Use using
 188                                 var handle = v.SafeMemoryMappedViewHandle;
 189                                 byte *b = null;
 190
 191                                 try {
 192                                         handle.AcquirePointer (ref b);
 193
 194                                         for (int i = 0; i < 5; ++i)
 195                                                 s += (char)b [i];
 196                                 } finally {
 197                                         handle.ReleasePointer ();
 198                                 }
 199
 200                                 Assert.AreEqual ("Hello", s);
 201                         }
 202                 }
 203
 204                 [Test]
 205                 public unsafe void ViewReadArray () {
 206                         var file = MemoryMappedFile.CreateFromFile (fname, FileMode.Open);
 207
 208                         using (var v = file.CreateViewAccessor ()) {
 209                                 var a = new byte [5];
 210                                 var n = v.ReadArray (0, a, 0, 5);
 211                                 Assert.AreEqual (5, n);
 212                                 var s = new string (Array.ConvertAll (a, b => (char)b));
 213                                 Assert.AreEqual ("Hello", s);
 214                         }
 215                 }
 216
 217
 218                 [Test]
 219                 public void NamedMappingToInvalidFile ()
 220                 {
 221                         var fileName = Path.Combine (tempDir, "temp_file_123");
 222                 if (File.Exists (fileName))
 223                     File.Delete (fileName);
 224                 var memoryMappedFile90 = MemoryMappedFile.CreateNew (fileName, 4194304, MemoryMappedFileAccess.ReadWrite);
 225                 memoryMappedFile90.CreateViewStream (4186112, 3222, MemoryMappedFileAccess.Write);
 226                 }
 227
 228                 [Test]
 229                 public void CreateTheSameAreaTwiceShouldFail ()
 230                 {
 231                         var name = MkNamedMapping ();
 232                         using (var m0 = MemoryMappedFile.CreateNew(name, 4096, MemoryMappedFileAccess.ReadWrite)) {
 233                                 try {
 234                                         using (var m1 = MemoryMappedFile.CreateNew (name, 4096, MemoryMappedFileAccess.ReadWrite)) {
 235                                                 Assert.Fail ("Must fail");
 236                                         }
 237                                 } catch (IOException) {}
 238                         }
 239                 }
 240
 241                 [Test]
 242                 public void MapAFileToAMemoryAreaShouldFail ()
 243                 {
 244                         var name = MkNamedMapping ();
 245                         using (var m0 = MemoryMappedFile.CreateNew(name, 4096, MemoryMappedFileAccess.ReadWrite)) {
 246                                 try {
 247                                         using (var m1 = MemoryMappedFile.CreateFromFile (fname, FileMode.OpenOrCreate, name)) {
 248                                                 Assert.Fail ("Must fail");
 249                                         }
 250                                 } catch (IOException) {}
 251                         }
 252                 }
 253
 254                 [Test]
 255                 public void NamedMappingsShareMemoryArea ()
 256                 {
 257                         var name = MkNamedMapping ();
 258                         using (var m0 = MemoryMappedFile.CreateNew(name, 4096, MemoryMappedFileAccess.ReadWrite)) {
 259                                 using (var m1 = MemoryMappedFile.CreateOrOpen (name, 4096, MemoryMappedFileAccess.ReadWrite)) {
 260                                         using (MemoryMappedViewAccessor v0 = m0.CreateViewAccessor (), v1 = m1.CreateViewAccessor ()) {
 261                                                 v0.Write (10, 0x12345);
 262                                                 Assert.AreEqual (0x12345, v1.ReadInt32 (10));
 263                                         }
 264                                 }
 265                         }
 266                 }
 267
 268                 [Test]
 269                 public void NamedFileCanBeOpen ()
 270                 {
 271                         var name = MkNamedMapping ();
 272                         using (var sw = new FileStream (fname, FileMode.Open)) {
 273                                 byte[] b = new byte[20];
 274                                 for (int i = 0; i < 20; ++i)
 275                                         b[i] = 0xFF;
 276                                 sw.Write (b, 0, 20);
 277                         }
 278
 279                         using (var m0 = MemoryMappedFile.CreateFromFile (fname, FileMode.Open, name)) {
 280                                 using (var m1 = MemoryMappedFile.CreateOrOpen (name, 4096)) {
 281                                         using (MemoryMappedViewAccessor v0 = m0.CreateViewAccessor (), v1 = m1.CreateViewAccessor ()) {
 282                                                 v0.Write (10, 0x11223344);
 283                                                 Assert.AreEqual (0x11223344, v1.ReadInt32 (10));
 284                                         }
 285                                 }
 286                         }
 287                 }
 288
 289                 [Test]
 290                 public void MapAtEdgeOfPage ()
 291                 {
 292                         using (var f = new FileStream (fname, FileMode.Open)) {
 293                                 var b = new byte [4096];
 294                                 for (int i = 0; i < 4096; ++i)
 295                                         b[i] = 0xAA;
 296                                 for (int i = 0; i < 2; ++i)
 297                                         f.Write (b, 0, 4096);
 298                         }
 299                         var m0 = MemoryMappedFile.CreateFromFile (fname, FileMode.Open);
 300                         var v0 = m0.CreateViewAccessor (500, 4096);
 301                         var v1 = m0.CreateViewAccessor (0, 4096 * 2);
 302                         for (int i = 0; i < 4096; ++i) {
 303                                 Assert.AreEqual (0xAA, v1.ReadByte (i + 500));
 304                                 v0.Write (i, (byte)0xFF);
 305                                 Assert.AreEqual (0xFF, v1.ReadByte (i + 500));
 306                         }
 307                 }
 308
 309                 [Test]
 310                 public void DoubleAccountingInOffsetCalculation ()
 311                 {
 312                         var memoryMappedFile90 = MemoryMappedFile.CreateNew (MkNamedMapping (), 4194304, MemoryMappedFileAccess.ReadWrite);
 313                         var stream = memoryMappedFile90.CreateViewStream (4186112, 3222, MemoryMappedFileAccess.Write);
 314                         using (var tw = new StreamWriter(stream))
 315                         {
 316                                 tw.WriteLine ("Hello World!");
 317                         }
 318                 }
 319         }
 320 }
 321
 322 #endif
 323