mono/metadata/w32event-unix.c

   1 /*
   2  * w32event-unix.c: Runtime support for managed Event on Unix
   3  *
   4  * Author:
   5  *      Ludovic Henry (luhenry@microsoft.com)
   6  *
   7  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
   8  */
   9
  10 #include "w32event.h"
  11
  12 #include "w32handle-namespace.h"
  13 #include "mono/io-layer/io-layer.h"
  14 #include "mono/utils/mono-logger-internals.h"
  15 #include "mono/utils/w32handle.h"
  16
  17 typedef struct {
  18         gboolean manual;
  19         guint32 set_count;
  20 } MonoW32HandleEvent;
  21
  22 struct MonoW32HandleNamedEvent {
  23         MonoW32HandleEvent e;
  24         MonoW32HandleNamespace sharedns;
  25 };
  26
  27 static gboolean event_handle_own (gpointer handle, MonoW32HandleType type, guint32 *statuscode)
  28 {
  29         MonoW32HandleEvent *event_handle;
  30         gboolean ok;
  31
  32         *statuscode = WAIT_OBJECT_0;
  33
  34         ok = mono_w32handle_lookup (handle, type, (gpointer *)&event_handle);
  35         if (!ok) {
  36                 g_warning ("%s: error looking up %s handle %p",
  37                         __func__, mono_w32handle_ops_typename (type), handle);
  38                 return FALSE;
  39         }
  40
  41         mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: owning %s handle %p",
  42                 __func__, mono_w32handle_ops_typename (type), handle);
  43
  44         if (!event_handle->manual) {
  45                 g_assert (event_handle->set_count > 0);
  46                 event_handle->set_count --;
  47
  48                 if (event_handle->set_count == 0)
  49                         mono_w32handle_set_signal_state (handle, FALSE, FALSE);
  50         }
  51
  52         return TRUE;
  53 }
  54
  55 static void event_signal(gpointer handle)
  56 {
  57         ves_icall_System_Threading_Events_SetEvent_internal (handle);
  58 }
  59
  60 static gboolean event_own (gpointer handle, guint32 *statuscode)
  61 {
  62         return event_handle_own (handle, MONO_W32HANDLE_EVENT, statuscode);
  63 }
  64
  65 static void namedevent_signal (gpointer handle)
  66 {
  67         ves_icall_System_Threading_Events_SetEvent_internal (handle);
  68 }
  69
  70 /* NB, always called with the shared handle lock held */
  71 static gboolean namedevent_own (gpointer handle, guint32 *statuscode)
  72 {
  73         return event_handle_own (handle, MONO_W32HANDLE_NAMEDEVENT, statuscode);
  74 }
  75
  76 static void event_details (gpointer data)
  77 {
  78         MonoW32HandleEvent *event = (MonoW32HandleEvent *)data;
  79         g_print ("manual: %s, set_count: %d",
  80                 event->manual ? "TRUE" : "FALSE", event->set_count);
  81 }
  82
  83 static void namedevent_details (gpointer data)
  84 {
  85         MonoW32HandleNamedEvent *namedevent = (MonoW32HandleNamedEvent *)data;
  86         g_print ("manual: %s, set_count: %d, name: \"%s\"",
  87                 namedevent->e.manual ? "TRUE" : "FALSE", namedevent->e.set_count, namedevent->sharedns.name);
  88 }
  89
  90 static const gchar* event_typename (void)
  91 {
  92         return "Event";
  93 }
  94
  95 static gsize event_typesize (void)
  96 {
  97         return sizeof (MonoW32HandleEvent);
  98 }
  99
 100 static const gchar* namedevent_typename (void)
 101 {
 102         return "N.Event";
 103 }
 104
 105 static gsize namedevent_typesize (void)
 106 {
 107         return sizeof (MonoW32HandleNamedEvent);
 108 }
 109
 110 void
 111 mono_w32event_init (void)
 112 {
 113         static MonoW32HandleOps event_ops = {
 114                 NULL,                   /* close */
 115                 event_signal,           /* signal */
 116                 event_own,              /* own */
 117                 NULL,                   /* is_owned */
 118                 NULL,                   /* special_wait */
 119                 NULL,                   /* prewait */
 120                 event_details,  /* details */
 121                 event_typename, /* typename */
 122                 event_typesize, /* typesize */
 123         };
 124
 125         static MonoW32HandleOps namedevent_ops = {
 126                 NULL,                   /* close */
 127                 namedevent_signal,      /* signal */
 128                 namedevent_own,         /* own */
 129                 NULL,                   /* is_owned */
 130                 NULL,                   /* special_wait */
 131                 NULL,                   /* prewait */
 132                 namedevent_details,     /* details */
 133                 namedevent_typename, /* typename */
 134                 namedevent_typesize, /* typesize */
 135         };
 136
 137         mono_w32handle_register_ops (MONO_W32HANDLE_EVENT,      &event_ops);
 138         mono_w32handle_register_ops (MONO_W32HANDLE_NAMEDEVENT, &namedevent_ops);
 139
 140         mono_w32handle_register_capabilities (MONO_W32HANDLE_EVENT,
 141                 (MonoW32HandleCapability)(MONO_W32HANDLE_CAP_WAIT | MONO_W32HANDLE_CAP_SIGNAL));
 142         mono_w32handle_register_capabilities (MONO_W32HANDLE_NAMEDEVENT,
 143                 (MonoW32HandleCapability)(MONO_W32HANDLE_CAP_WAIT | MONO_W32HANDLE_CAP_SIGNAL));
 144 }
 145
 146 gpointer
 147 mono_w32event_create (gboolean manual, gboolean initial)
 148 {
 149         gpointer handle;
 150         gint32 error;
 151
 152         handle = ves_icall_System_Threading_Events_CreateEvent_internal (manual, initial, NULL, &error);
 153         if (error != ERROR_SUCCESS)
 154                 g_assert (!handle);
 155
 156         return handle;
 157 }
 158
 159 void
 160 mono_w32event_set (gpointer handle)
 161 {
 162         ves_icall_System_Threading_Events_SetEvent_internal (handle);
 163 }
 164
 165 void
 166 mono_w32event_reset (gpointer handle)
 167 {
 168         ves_icall_System_Threading_Events_ResetEvent_internal (handle);
 169 }
 170
 171 static gpointer event_handle_create (MonoW32HandleEvent *event_handle, MonoW32HandleType type, gboolean manual, gboolean initial)
 172 {
 173         gpointer handle;
 174         int thr_ret;
 175
 176         event_handle->manual = manual;
 177         event_handle->set_count = (initial && !manual) ? 1 : 0;
 178
 179         handle = mono_w32handle_new (type, event_handle);
 180         if (handle == INVALID_HANDLE_VALUE) {
 181                 g_warning ("%s: error creating %s handle",
 182                         __func__, mono_w32handle_ops_typename (type));
 183                 SetLastError (ERROR_GEN_FAILURE);
 184                 return NULL;
 185         }
 186
 187         thr_ret = mono_w32handle_lock_handle (handle);
 188         g_assert (thr_ret == 0);
 189
 190         if (initial)
 191                 mono_w32handle_set_signal_state (handle, TRUE, FALSE);
 192
 193         thr_ret = mono_w32handle_unlock_handle (handle);
 194         g_assert (thr_ret == 0);
 195
 196         mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: created %s handle %p",
 197                 __func__, mono_w32handle_ops_typename (type), handle);
 198
 199         return handle;
 200 }
 201
 202 static gpointer event_create (gboolean manual, gboolean initial)
 203 {
 204         MonoW32HandleEvent event_handle;
 205         mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: creating %s handle",
 206                 __func__, mono_w32handle_ops_typename (MONO_W32HANDLE_EVENT));
 207         return event_handle_create (&event_handle, MONO_W32HANDLE_EVENT, manual, initial);
 208 }
 209
 210 static gpointer namedevent_create (gboolean manual, gboolean initial, const gunichar2 *name G_GNUC_UNUSED)
 211 {
 212         gpointer handle;
 213         gchar *utf8_name;
 214
 215         mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: creating %s handle",
 216                 __func__, mono_w32handle_ops_typename (MONO_W32HANDLE_NAMEDEVENT));
 217
 218         /* w32 seems to guarantee that opening named objects can't race each other */
 219         mono_w32handle_namespace_lock ();
 220
 221         utf8_name = g_utf16_to_utf8 (name, -1, NULL, NULL, NULL);
 222
 223         handle = mono_w32handle_namespace_search_handle (MONO_W32HANDLE_NAMEDEVENT, utf8_name);
 224         if (handle == INVALID_HANDLE_VALUE) {
 225                 /* The name has already been used for a different object. */
 226                 handle = NULL;
 227                 SetLastError (ERROR_INVALID_HANDLE);
 228         } else if (handle) {
 229                 /* Not an error, but this is how the caller is informed that the event wasn't freshly created */
 230                 SetLastError (ERROR_ALREADY_EXISTS);
 231
 232                 /* mono_w32handle_namespace_search_handle already adds a ref to the handle */
 233         } else {
 234                 /* A new named event */
 235                 MonoW32HandleNamedEvent namedevent_handle;
 236
 237                 strncpy (&namedevent_handle.sharedns.name [0], utf8_name, MAX_PATH);
 238                 namedevent_handle.sharedns.name [MAX_PATH] = '\0';
 239
 240                 handle = event_handle_create ((MonoW32HandleEvent*) &namedevent_handle, MONO_W32HANDLE_NAMEDEVENT, manual, initial);
 241         }
 242
 243         g_free (utf8_name);
 244
 245         mono_w32handle_namespace_unlock ();
 246
 247         return handle;
 248 }
 249
 250 gpointer
 251 ves_icall_System_Threading_Events_CreateEvent_internal (MonoBoolean manual, MonoBoolean initial, MonoString *name, gint32 *error)
 252 {
 253         gpointer event;
 254
 255         /* Need to blow away any old errors here, because code tests
 256          * for ERROR_ALREADY_EXISTS on success (!) to see if an event
 257          * was freshly created */
 258         SetLastError (ERROR_SUCCESS);
 259
 260         event = name ? namedevent_create (manual, initial, mono_string_chars (name)) : event_create (manual, initial);
 261
 262         *error = GetLastError ();
 263
 264         return event;
 265 }
 266
 267 gboolean
 268 ves_icall_System_Threading_Events_SetEvent_internal (gpointer handle)
 269 {
 270         MonoW32HandleType type;
 271         MonoW32HandleEvent *event_handle;
 272         int thr_ret;
 273
 274         if (handle == NULL) {
 275                 SetLastError (ERROR_INVALID_HANDLE);
 276                 return(FALSE);
 277         }
 278
 279         switch (type = mono_w32handle_get_type (handle)) {
 280         case MONO_W32HANDLE_EVENT:
 281         case MONO_W32HANDLE_NAMEDEVENT:
 282                 break;
 283         default:
 284                 SetLastError (ERROR_INVALID_HANDLE);
 285                 return FALSE;
 286         }
 287
 288         if (!mono_w32handle_lookup (handle, type, (gpointer *)&event_handle)) {
 289                 g_warning ("%s: error looking up %s handle %p",
 290                         __func__, mono_w32handle_ops_typename (type), handle);
 291                 return FALSE;
 292         }
 293
 294         mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: setting %s handle %p",
 295                 __func__, mono_w32handle_ops_typename (type), handle);
 296
 297         thr_ret = mono_w32handle_lock_handle (handle);
 298         g_assert (thr_ret == 0);
 299
 300         if (!event_handle->manual) {
 301                 event_handle->set_count = 1;
 302                 mono_w32handle_set_signal_state (handle, TRUE, FALSE);
 303         } else {
 304                 mono_w32handle_set_signal_state (handle, TRUE, TRUE);
 305         }
 306
 307         thr_ret = mono_w32handle_unlock_handle (handle);
 308         g_assert (thr_ret == 0);
 309
 310         return TRUE;
 311 }
 312
 313 gboolean
 314 ves_icall_System_Threading_Events_ResetEvent_internal (gpointer handle)
 315 {
 316         MonoW32HandleType type;
 317         MonoW32HandleEvent *event_handle;
 318         int thr_ret;
 319
 320         SetLastError (ERROR_SUCCESS);
 321
 322         if (handle == NULL) {
 323                 SetLastError (ERROR_INVALID_HANDLE);
 324                 return(FALSE);
 325         }
 326
 327         switch (type = mono_w32handle_get_type (handle)) {
 328         case MONO_W32HANDLE_EVENT:
 329         case MONO_W32HANDLE_NAMEDEVENT:
 330                 break;
 331         default:
 332                 SetLastError (ERROR_INVALID_HANDLE);
 333                 return FALSE;
 334         }
 335
 336         if (!mono_w32handle_lookup (handle, type, (gpointer *)&event_handle)) {
 337                 g_warning ("%s: error looking up %s handle %p",
 338                         __func__, mono_w32handle_ops_typename (type), handle);
 339                 return FALSE;
 340         }
 341
 342         mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: resetting %s handle %p",
 343                 __func__, mono_w32handle_ops_typename (type), handle);
 344
 345         thr_ret = mono_w32handle_lock_handle (handle);
 346         g_assert (thr_ret == 0);
 347
 348         if (!mono_w32handle_issignalled (handle)) {
 349                 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: no need to reset %s handle %p",
 350                         __func__, mono_w32handle_ops_typename (type), handle);
 351         } else {
 352                 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: obtained write lock on %s handle %p",
 353                         __func__, mono_w32handle_ops_typename (type), handle);
 354
 355                 mono_w32handle_set_signal_state (handle, FALSE, FALSE);
 356         }
 357
 358         event_handle->set_count = 0;
 359
 360         thr_ret = mono_w32handle_unlock_handle (handle);
 361         g_assert (thr_ret == 0);
 362
 363         return TRUE;
 364 }
 365
 366 void
 367 ves_icall_System_Threading_Events_CloseEvent_internal (gpointer handle)
 368 {
 369         CloseHandle (handle);
 370 }
 371
 372 gpointer
 373 ves_icall_System_Threading_Events_OpenEvent_internal (MonoString *name, gint32 rights G_GNUC_UNUSED, gint32 *error)
 374 {
 375         gpointer handle;
 376         gchar *utf8_name;
 377
 378         *error = ERROR_SUCCESS;
 379
 380         /* w32 seems to guarantee that opening named objects can't race each other */
 381         mono_w32handle_namespace_lock ();
 382
 383         utf8_name = g_utf16_to_utf8 (mono_string_chars (name), -1, NULL, NULL, NULL);
 384
 385         mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: Opening named event [%s]", __func__, utf8_name);
 386
 387         handle = mono_w32handle_namespace_search_handle (MONO_W32HANDLE_NAMEDEVENT, utf8_name);
 388         if (handle == INVALID_HANDLE_VALUE) {
 389                 /* The name has already been used for a different object. */
 390                 *error = ERROR_INVALID_HANDLE;
 391                 goto cleanup;
 392         } else if (!handle) {
 393                 /* This name doesn't exist */
 394                 *error = ERROR_FILE_NOT_FOUND;
 395                 goto cleanup;
 396         }
 397
 398         mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: returning named event handle %p", __func__, handle);
 399
 400 cleanup:
 401         g_free (utf8_name);
 402
 403         mono_w32handle_namespace_unlock ();
 404
 405         return handle;
 406 }
 407
 408 MonoW32HandleNamespace*
 409 mono_w32event_get_namespace (MonoW32HandleNamedEvent *event)
 410 {
 411         return &event->sharedns;
 412 }