aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/mesa/main/syncobj.c
blob: 987d4f57cbd7e1c42058aa7806358f046c6595f6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
/*
 * Copyright © 2009 Intel Corporation
 *
 * 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 (including the next
 * paragraph) 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.
 */

/**
 * \file syncobj.c
 * Sync object management.
 *
 * Unlike textures and other objects that are shared between contexts, sync
 * objects are not bound to the context.  As a result, the reference counting
 * and delete behavior of sync objects is slightly different.  References to
 * sync objects are added:
 *
 *    - By \c glFencSynce.  This sets the initial reference count to 1.
 *    - At the start of \c glClientWaitSync.  The reference is held for the
 *      duration of the wait call.
 *
 * References are removed:
 *
 *    - By \c glDeleteSync.
 *    - At the end of \c glClientWaitSync.
 *
 * Additionally, drivers may call \c _mesa_ref_sync_object and
 * \c _mesa_unref_sync_object as needed to implement \c ServerWaitSync.
 *
 * As with shader objects, sync object names become invalid as soon as
 * \c glDeleteSync is called.  For this reason \c glDeleteSync sets the
 * \c DeletePending flag.  All functions validate object handles by testing
 * this flag.
 *
 * \note
 * Only \c GL_ARB_sync objects are shared between contexts.  If support is ever
 * added for either \c GL_NV_fence or \c GL_APPLE_fence different semantics
 * will need to be implemented.
 *
 * \author Ian Romanick <ian.d.romanick@intel.com>
 */

#include <inttypes.h>
#include "glheader.h"
#include "imports.h"
#include "context.h"
#include "macros.h"
#include "get.h"
#include "dispatch.h"
#include "mtypes.h"
#include "set.h"
#include "hash_table.h"

#include "syncobj.h"

static struct gl_sync_object *
_mesa_new_sync_object(struct gl_context *ctx, GLenum type)
{
   struct gl_sync_object *s = CALLOC_STRUCT(gl_sync_object);
   (void) ctx;
   (void) type;

   return s;
}


static void
_mesa_delete_sync_object(struct gl_context *ctx, struct gl_sync_object *syncObj)
{
   (void) ctx;
   free(syncObj->Label);
   free(syncObj);
}


static void
_mesa_fence_sync(struct gl_context *ctx, struct gl_sync_object *syncObj,
		 GLenum condition, GLbitfield flags)
{
   (void) ctx;
   (void) condition;
   (void) flags;

   syncObj->StatusFlag = 1;
}


static void
_mesa_check_sync(struct gl_context *ctx, struct gl_sync_object *syncObj)
{
   (void) ctx;
   (void) syncObj;

   /* No-op for software rendering.  Hardware drivers will need to determine
    * whether the state of the sync object has changed.
    */
}


static void
_mesa_wait_sync(struct gl_context *ctx, struct gl_sync_object *syncObj,
		GLbitfield flags, GLuint64 timeout)
{
   (void) ctx;
   (void) syncObj;
   (void) flags;
   (void) timeout;

   /* No-op for software rendering.  Hardware drivers will need to wait until
    * the state of the sync object changes or the timeout expires.
    */
}


void
_mesa_init_sync_object_functions(struct dd_function_table *driver)
{
   driver->NewSyncObject = _mesa_new_sync_object;
   driver->FenceSync = _mesa_fence_sync;
   driver->DeleteSyncObject = _mesa_delete_sync_object;
   driver->CheckSync = _mesa_check_sync;

   /* Use the same no-op wait function for both.
    */
   driver->ClientWaitSync = _mesa_wait_sync;
   driver->ServerWaitSync = _mesa_wait_sync;
}

/**
 * Allocate/init the context state related to sync objects.
 */
void
_mesa_init_sync(struct gl_context *ctx)
{
   (void) ctx;
}


/**
 * Free the context state related to sync objects.
 */
void
_mesa_free_sync_data(struct gl_context *ctx)
{
   (void) ctx;
}


int
_mesa_validate_sync(struct gl_context *ctx, struct gl_sync_object *syncObj)
{
   return (syncObj != NULL)
      && _mesa_set_search(ctx->Shared->SyncObjects,
                          _mesa_hash_pointer(syncObj),
                          syncObj) != NULL
      && (syncObj->Type == GL_SYNC_FENCE)
      && !syncObj->DeletePending;
}


void
_mesa_ref_sync_object(struct gl_context *ctx, struct gl_sync_object *syncObj)
{
   _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
   syncObj->RefCount++;
   _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
}


void
_mesa_unref_sync_object(struct gl_context *ctx, struct gl_sync_object *syncObj)
{
   struct set_entry *entry;

   _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
   syncObj->RefCount--;
   if (syncObj->RefCount == 0) {
      entry = _mesa_set_search(ctx->Shared->SyncObjects,
                               _mesa_hash_pointer(syncObj),
                               syncObj);
      assert (entry != NULL);
      _mesa_set_remove(ctx->Shared->SyncObjects, entry);
      _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);

      ctx->Driver.DeleteSyncObject(ctx, syncObj);
   } else {
      _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
   }
}


GLboolean GLAPIENTRY
_mesa_IsSync(GLsync sync)
{
   GET_CURRENT_CONTEXT(ctx);
   struct gl_sync_object *const syncObj = (struct gl_sync_object *) sync;
   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);

   return _mesa_validate_sync(ctx, syncObj) ? GL_TRUE : GL_FALSE;
}


void GLAPIENTRY
_mesa_DeleteSync(GLsync sync)
{
   GET_CURRENT_CONTEXT(ctx);
   struct gl_sync_object *const syncObj = (struct gl_sync_object *) sync;

   /* From the GL_ARB_sync spec:
    *
    *    DeleteSync will silently ignore a <sync> value of zero. An
    *    INVALID_VALUE error is generated if <sync> is neither zero nor the
    *    name of a sync object.
    */
   if (sync == 0) {
      return;
   }

   if (!_mesa_validate_sync(ctx, syncObj)) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteSync (not a valid sync object)");
      return;
   }

   /* If there are no client-waits or server-waits pending on this sync, delete
    * the underlying object.
    */
   syncObj->DeletePending = GL_TRUE;
   _mesa_unref_sync_object(ctx, syncObj);
}


GLsync GLAPIENTRY
_mesa_FenceSync(GLenum condition, GLbitfield flags)
{
   GET_CURRENT_CONTEXT(ctx);
   struct gl_sync_object *syncObj;
   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);

   if (condition != GL_SYNC_GPU_COMMANDS_COMPLETE) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glFenceSync(condition=0x%x)",
		  condition);
      return 0;
   }

   if (flags != 0) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glFenceSync(flags=0x%x)",
		  condition);
      return 0;
   }

   syncObj = ctx->Driver.NewSyncObject(ctx, GL_SYNC_FENCE);
   if (syncObj != NULL) {
      syncObj->Type = GL_SYNC_FENCE;
      /* The name is not currently used, and it is never visible to
       * applications.  If sync support is extended to provide support for
       * NV_fence, this field will be used.  We'll also need to add an object
       * ID hashtable.
       */
      syncObj->Name = 1;
      syncObj->RefCount = 1;
      syncObj->DeletePending = GL_FALSE;
      syncObj->SyncCondition = condition;
      syncObj->Flags = flags;
      syncObj->StatusFlag = 0;

      ctx->Driver.FenceSync(ctx, syncObj, condition, flags);

      _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
      _mesa_set_add(ctx->Shared->SyncObjects,
                    _mesa_hash_pointer(syncObj),
                    syncObj);
      _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);

      return (GLsync) syncObj;
   }

   return NULL;
}


GLenum GLAPIENTRY
_mesa_ClientWaitSync(GLsync sync, GLbitfield flags, GLuint64 timeout)
{
   GET_CURRENT_CONTEXT(ctx);
   struct gl_sync_object *const syncObj = (struct gl_sync_object *) sync;
   GLenum ret;
   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_WAIT_FAILED);

   if (!_mesa_validate_sync(ctx, syncObj)) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glClientWaitSync (not a valid sync object)");
      return GL_WAIT_FAILED;
   }

   if ((flags & ~GL_SYNC_FLUSH_COMMANDS_BIT) != 0) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glClientWaitSync(flags=0x%x)", flags);
      return GL_WAIT_FAILED;
   }

   _mesa_ref_sync_object(ctx, syncObj);

   /* From the GL_ARB_sync spec:
    *
    *    ClientWaitSync returns one of four status values. A return value of
    *    ALREADY_SIGNALED indicates that <sync> was signaled at the time
    *    ClientWaitSync was called. ALREADY_SIGNALED will always be returned
    *    if <sync> was signaled, even if the value of <timeout> is zero.
    */
   ctx->Driver.CheckSync(ctx, syncObj);
   if (syncObj->StatusFlag) {
      ret = GL_ALREADY_SIGNALED;
   } else {
      if (timeout == 0) {
         ret = GL_TIMEOUT_EXPIRED;
      } else {
         ctx->Driver.ClientWaitSync(ctx, syncObj, flags, timeout);

         ret = syncObj->StatusFlag ? GL_CONDITION_SATISFIED : GL_TIMEOUT_EXPIRED;
      }
   }

   _mesa_unref_sync_object(ctx, syncObj);
   return ret;
}


void GLAPIENTRY
_mesa_WaitSync(GLsync sync, GLbitfield flags, GLuint64 timeout)
{
   GET_CURRENT_CONTEXT(ctx);
   struct gl_sync_object *const syncObj = (struct gl_sync_object *) sync;

   if (!_mesa_validate_sync(ctx, syncObj)) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glWaitSync (not a valid sync object)");
      return;
   }

   if (flags != 0) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glWaitSync(flags=0x%x)", flags);
      return;
   }

   if (timeout != GL_TIMEOUT_IGNORED) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glWaitSync(timeout=0x%" PRIx64 ")",
                  (uint64_t) timeout);
      return;
   }

   ctx->Driver.ServerWaitSync(ctx, syncObj, flags, timeout);
}


void GLAPIENTRY
_mesa_GetSynciv(GLsync sync, GLenum pname, GLsizei bufSize, GLsizei *length,
		GLint *values)
{
   GET_CURRENT_CONTEXT(ctx);
   struct gl_sync_object *const syncObj = (struct gl_sync_object *) sync;
   GLsizei size = 0;
   GLint v[1];

   if (!_mesa_validate_sync(ctx, syncObj)) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glGetSynciv (not a valid sync object)");
      return;
   }

   switch (pname) {
   case GL_OBJECT_TYPE:
      v[0] = syncObj->Type;
      size = 1;
      break;

   case GL_SYNC_CONDITION:
      v[0] = syncObj->SyncCondition;
      size = 1;
      break;

   case GL_SYNC_STATUS:
      /* Update the state of the sync by dipping into the driver.  Note that
       * this call won't block.  It just updates state in the common object
       * data from the current driver state.
       */
      ctx->Driver.CheckSync(ctx, syncObj);

      v[0] = (syncObj->StatusFlag) ? GL_SIGNALED : GL_UNSIGNALED;
      size = 1;
      break;

   case GL_SYNC_FLAGS:
      v[0] = syncObj->Flags;
      size = 1;
      break;

   default:
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetSynciv(pname=0x%x)\n", pname);
      return;
   }

   if (size > 0) {
      const GLsizei copy_count = MIN2(size, bufSize);

      memcpy(values, v, sizeof(GLint) * copy_count);
   }

   if (length != NULL) {
      *length = size;
   }
}