src/mesa/main/syncobj.c

   1 /*
   2  * Copyright © 2009 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file syncobj.c
  26  * Sync object management.
  27  *
  28  * Unlike textures and other objects that are shared between contexts, sync
  29  * objects are not bound to the context.  As a result, the reference counting
  30  * and delete behavior of sync objects is slightly different.  References to
  31  * sync objects are added:
  32  *
  33  *    - By \c glFencSynce.  This sets the initial reference count to 1.
  34  *    - At the start of \c glClientWaitSync.  The reference is held for the
  35  *      duration of the wait call.
  36  *
  37  * References are removed:
  38  *
  39  *    - By \c glDeleteSync.
  40  *    - At the end of \c glClientWaitSync.
  41  *
  42  * Additionally, drivers may call \c _mesa_ref_sync_object and
  43  * \c _mesa_unref_sync_object as needed to implement \c ServerWaitSync.
  44  *
  45  * As with shader objects, sync object names become invalid as soon as
  46  * \c glDeleteSync is called.  For this reason \c glDeleteSync sets the
  47  * \c DeletePending flag.  All functions validate object handles by testing
  48  * this flag.
  49  *
  50  * \note
  51  * Only \c GL_ARB_sync objects are shared between contexts.  If support is ever
  52  * added for either \c GL_NV_fence or \c GL_APPLE_fence different semantics
  53  * will need to be implemented.
  54  *
  55  * \author Ian Romanick <ian.d.romanick@intel.com>
  56  */
  57
  58 #include <inttypes.h>
  59 #include "glheader.h"
  60 #include "imports.h"
  61 #include "context.h"
  62 #include "macros.h"
  63 #include "get.h"
  64 #include "dispatch.h"
  65 #include "mtypes.h"
  66 #include "util/hash_table.h"
  67 #include "util/set.h"
  68
  69 #include "syncobj.h"
  70
  71 static struct gl_sync_object *
  72 _mesa_new_sync_object(struct gl_context *ctx)
  73 {
  74    struct gl_sync_object *s = CALLOC_STRUCT(gl_sync_object);
  75    (void) ctx;
  76
  77    return s;
  78 }
  79
  80
  81 static void
  82 _mesa_delete_sync_object(struct gl_context *ctx, struct gl_sync_object *syncObj)
  83 {
  84    (void) ctx;
  85    free(syncObj->Label);
  86    free(syncObj);
  87 }
  88
  89
  90 static void
  91 _mesa_fence_sync(struct gl_context *ctx, struct gl_sync_object *syncObj,
  92                  GLenum condition, GLbitfield flags)
  93 {
  94    (void) ctx;
  95    (void) condition;
  96    (void) flags;
  97
  98    syncObj->StatusFlag = 1;
  99 }
 100
 101
 102 static void
 103 _mesa_check_sync(struct gl_context *ctx, struct gl_sync_object *syncObj)
 104 {
 105    (void) ctx;
 106    (void) syncObj;
 107
 108    /* No-op for software rendering.  Hardware drivers will need to determine
 109     * whether the state of the sync object has changed.
 110     */
 111 }
 112
 113
 114 static void
 115 _mesa_wait_sync(struct gl_context *ctx, struct gl_sync_object *syncObj,
 116                 GLbitfield flags, GLuint64 timeout)
 117 {
 118    (void) ctx;
 119    (void) syncObj;
 120    (void) flags;
 121    (void) timeout;
 122
 123    /* No-op for software rendering.  Hardware drivers will need to wait until
 124     * the state of the sync object changes or the timeout expires.
 125     */
 126 }
 127
 128
 129 void
 130 _mesa_init_sync_object_functions(struct dd_function_table *driver)
 131 {
 132    driver->NewSyncObject = _mesa_new_sync_object;
 133    driver->FenceSync = _mesa_fence_sync;
 134    driver->DeleteSyncObject = _mesa_delete_sync_object;
 135    driver->CheckSync = _mesa_check_sync;
 136
 137    /* Use the same no-op wait function for both.
 138     */
 139    driver->ClientWaitSync = _mesa_wait_sync;
 140    driver->ServerWaitSync = _mesa_wait_sync;
 141 }
 142
 143 /**
 144  * Allocate/init the context state related to sync objects.
 145  */
 146 void
 147 _mesa_init_sync(struct gl_context *ctx)
 148 {
 149    (void) ctx;
 150 }
 151
 152
 153 /**
 154  * Free the context state related to sync objects.
 155  */
 156 void
 157 _mesa_free_sync_data(struct gl_context *ctx)
 158 {
 159    (void) ctx;
 160 }
 161
 162
 163 /**
 164  * Check if the given sync object is:
 165  *  - non-null
 166  *  - not in sync objects hash table
 167  *  - not marked as deleted
 168  *
 169  * Returns the internal gl_sync_object pointer if the sync object is valid
 170  * or NULL if it isn't.
 171  *
 172  * If "incRefCount" is true, the reference count is incremented, which is
 173  * normally what you want; otherwise, a glDeleteSync from another thread
 174  * could delete the sync object while you are still working on it.
 175  */
 176 struct gl_sync_object *
 177 _mesa_get_and_ref_sync(struct gl_context *ctx, GLsync sync, bool incRefCount)
 178 {
 179    struct gl_sync_object *syncObj = (struct gl_sync_object *) sync;
 180    mtx_lock(&ctx->Shared->Mutex);
 181    if (syncObj != NULL
 182       && _mesa_set_search(ctx->Shared->SyncObjects, syncObj) != NULL
 183       && !syncObj->DeletePending) {
 184      if (incRefCount) {
 185        syncObj->RefCount++;
 186      }
 187    } else {
 188      syncObj = NULL;
 189    }
 190    mtx_unlock(&ctx->Shared->Mutex);
 191    return syncObj;
 192 }
 193
 194
 195 void
 196 _mesa_unref_sync_object(struct gl_context *ctx, struct gl_sync_object *syncObj,
 197                         int amount)
 198 {
 199    struct set_entry *entry;
 200
 201    mtx_lock(&ctx->Shared->Mutex);
 202    syncObj->RefCount -= amount;
 203    if (syncObj->RefCount == 0) {
 204       entry = _mesa_set_search(ctx->Shared->SyncObjects, syncObj);
 205       assert (entry != NULL);
 206       _mesa_set_remove(ctx->Shared->SyncObjects, entry);
 207       mtx_unlock(&ctx->Shared->Mutex);
 208
 209       ctx->Driver.DeleteSyncObject(ctx, syncObj);
 210    } else {
 211       mtx_unlock(&ctx->Shared->Mutex);
 212    }
 213 }
 214
 215
 216 GLboolean GLAPIENTRY
 217 _mesa_IsSync(GLsync sync)
 218 {
 219    GET_CURRENT_CONTEXT(ctx);
 220    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 221
 222    return _mesa_get_and_ref_sync(ctx, sync, false) ? GL_TRUE : GL_FALSE;
 223 }
 224
 225
 226 static ALWAYS_INLINE void
 227 delete_sync(struct gl_context *ctx, GLsync sync, bool no_error)
 228 {
 229    struct gl_sync_object *syncObj;
 230
 231    /* From the GL_ARB_sync spec:
 232     *
 233     *    DeleteSync will silently ignore a <sync> value of zero. An
 234     *    INVALID_VALUE error is generated if <sync> is neither zero nor the
 235     *    name of a sync object.
 236     */
 237    if (sync == 0) {
 238       return;
 239    }
 240
 241    syncObj = _mesa_get_and_ref_sync(ctx, sync, true);
 242    if (!no_error && !syncObj) {
 243       _mesa_error(ctx, GL_INVALID_VALUE,
 244                   "glDeleteSync (not a valid sync object)");
 245       return;
 246    }
 247
 248    /* If there are no client-waits or server-waits pending on this sync, delete
 249     * the underlying object. Note that we double-unref the object, as
 250     * _mesa_get_and_ref_sync above took an extra refcount to make sure the
 251     * pointer is valid for us to manipulate.
 252     */
 253    syncObj->DeletePending = GL_TRUE;
 254    _mesa_unref_sync_object(ctx, syncObj, 2);
 255 }
 256
 257
 258 void GLAPIENTRY
 259 _mesa_DeleteSync_no_error(GLsync sync)
 260 {
 261    GET_CURRENT_CONTEXT(ctx);
 262    delete_sync(ctx, sync, true);
 263 }
 264
 265
 266 void GLAPIENTRY
 267 _mesa_DeleteSync(GLsync sync)
 268 {
 269    GET_CURRENT_CONTEXT(ctx);
 270    delete_sync(ctx, sync, false);
 271 }
 272
 273
 274 static GLsync
 275 fence_sync(struct gl_context *ctx, GLenum condition, GLbitfield flags)
 276 {
 277    struct gl_sync_object *syncObj;
 278
 279    syncObj = ctx->Driver.NewSyncObject(ctx);
 280    if (syncObj != NULL) {
 281       /* The name is not currently used, and it is never visible to
 282        * applications.  If sync support is extended to provide support for
 283        * NV_fence, this field will be used.  We'll also need to add an object
 284        * ID hashtable.
 285        */
 286       syncObj->Name = 1;
 287       syncObj->RefCount = 1;
 288       syncObj->DeletePending = GL_FALSE;
 289       syncObj->SyncCondition = condition;
 290       syncObj->Flags = flags;
 291       syncObj->StatusFlag = 0;
 292
 293       ctx->Driver.FenceSync(ctx, syncObj, condition, flags);
 294
 295       mtx_lock(&ctx->Shared->Mutex);
 296       _mesa_set_add(ctx->Shared->SyncObjects, syncObj);
 297       mtx_unlock(&ctx->Shared->Mutex);
 298
 299       return (GLsync)syncObj;
 300    }
 301
 302    return NULL;
 303 }
 304
 305
 306 GLsync GLAPIENTRY
 307 _mesa_FenceSync_no_error(GLenum condition, GLbitfield flags)
 308 {
 309    GET_CURRENT_CONTEXT(ctx);
 310    return fence_sync(ctx, condition, flags);
 311 }
 312
 313
 314 GLsync GLAPIENTRY
 315 _mesa_FenceSync(GLenum condition, GLbitfield flags)
 316 {
 317    GET_CURRENT_CONTEXT(ctx);
 318    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
 319
 320    if (condition != GL_SYNC_GPU_COMMANDS_COMPLETE) {
 321       _mesa_error(ctx, GL_INVALID_ENUM, "glFenceSync(condition=0x%x)",
 322                   condition);
 323       return 0;
 324    }
 325
 326    if (flags != 0) {
 327       _mesa_error(ctx, GL_INVALID_VALUE, "glFenceSync(flags=0x%x)",
 328                   condition);
 329       return 0;
 330    }
 331
 332    return fence_sync(ctx, condition, flags);
 333 }
 334
 335
 336 static GLenum
 337 client_wait_sync(struct gl_context *ctx, struct gl_sync_object *syncObj,
 338                  GLbitfield flags, GLuint64 timeout)
 339 {
 340    GLenum ret;
 341
 342    /* From the GL_ARB_sync spec:
 343     *
 344     *    ClientWaitSync returns one of four status values. A return value of
 345     *    ALREADY_SIGNALED indicates that <sync> was signaled at the time
 346     *    ClientWaitSync was called. ALREADY_SIGNALED will always be returned
 347     *    if <sync> was signaled, even if the value of <timeout> is zero.
 348     */
 349    ctx->Driver.CheckSync(ctx, syncObj);
 350    if (syncObj->StatusFlag) {
 351       ret = GL_ALREADY_SIGNALED;
 352    } else {
 353       if (timeout == 0) {
 354          ret = GL_TIMEOUT_EXPIRED;
 355       } else {
 356          ctx->Driver.ClientWaitSync(ctx, syncObj, flags, timeout);
 357
 358          ret = syncObj->StatusFlag ? GL_CONDITION_SATISFIED : GL_TIMEOUT_EXPIRED;
 359       }
 360    }
 361
 362    _mesa_unref_sync_object(ctx, syncObj, 1);
 363    return ret;
 364 }
 365
 366
 367 GLenum GLAPIENTRY
 368 _mesa_ClientWaitSync_no_error(GLsync sync, GLbitfield flags, GLuint64 timeout)
 369 {
 370    GET_CURRENT_CONTEXT(ctx);
 371
 372    struct gl_sync_object *syncObj = _mesa_get_and_ref_sync(ctx, sync, true);
 373    return client_wait_sync(ctx, syncObj, flags, timeout);
 374 }
 375
 376
 377 GLenum GLAPIENTRY
 378 _mesa_ClientWaitSync(GLsync sync, GLbitfield flags, GLuint64 timeout)
 379 {
 380    GET_CURRENT_CONTEXT(ctx);
 381    struct gl_sync_object *syncObj;
 382
 383    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_WAIT_FAILED);
 384
 385    if ((flags & ~GL_SYNC_FLUSH_COMMANDS_BIT) != 0) {
 386       _mesa_error(ctx, GL_INVALID_VALUE, "glClientWaitSync(flags=0x%x)", flags);
 387       return GL_WAIT_FAILED;
 388    }
 389
 390    syncObj = _mesa_get_and_ref_sync(ctx, sync, true);
 391    if (!syncObj) {
 392       _mesa_error(ctx, GL_INVALID_VALUE, "glClientWaitSync (not a valid sync object)");
 393       return GL_WAIT_FAILED;
 394    }
 395
 396    return client_wait_sync(ctx, syncObj, flags, timeout);
 397 }
 398
 399
 400 static void
 401 wait_sync(struct gl_context *ctx, struct gl_sync_object *syncObj,
 402           GLbitfield flags, GLuint64 timeout)
 403 {
 404    ctx->Driver.ServerWaitSync(ctx, syncObj, flags, timeout);
 405    _mesa_unref_sync_object(ctx, syncObj, 1);
 406 }
 407
 408
 409 void GLAPIENTRY
 410 _mesa_WaitSync_no_error(GLsync sync, GLbitfield flags, GLuint64 timeout)
 411 {
 412    GET_CURRENT_CONTEXT(ctx);
 413
 414    struct gl_sync_object *syncObj = _mesa_get_and_ref_sync(ctx, sync, true);
 415    wait_sync(ctx, syncObj, flags, timeout);
 416 }
 417
 418
 419 void GLAPIENTRY
 420 _mesa_WaitSync(GLsync sync, GLbitfield flags, GLuint64 timeout)
 421 {
 422    GET_CURRENT_CONTEXT(ctx);
 423    struct gl_sync_object *syncObj;
 424
 425    if (flags != 0) {
 426       _mesa_error(ctx, GL_INVALID_VALUE, "glWaitSync(flags=0x%x)", flags);
 427       return;
 428    }
 429
 430    if (timeout != GL_TIMEOUT_IGNORED) {
 431       _mesa_error(ctx, GL_INVALID_VALUE, "glWaitSync(timeout=0x%" PRIx64 ")",
 432                   (uint64_t) timeout);
 433       return;
 434    }
 435
 436    syncObj = _mesa_get_and_ref_sync(ctx, sync, true);
 437    if (!syncObj) {
 438       _mesa_error(ctx, GL_INVALID_VALUE, "glWaitSync (not a valid sync object)");
 439       return;
 440    }
 441
 442    wait_sync(ctx, syncObj, flags, timeout);
 443 }
 444
 445
 446 void GLAPIENTRY
 447 _mesa_GetSynciv(GLsync sync, GLenum pname, GLsizei bufSize, GLsizei *length,
 448                 GLint *values)
 449 {
 450    GET_CURRENT_CONTEXT(ctx);
 451    struct gl_sync_object *syncObj;
 452    GLsizei size = 0;
 453    GLint v[1];
 454
 455    syncObj = _mesa_get_and_ref_sync(ctx, sync, true);
 456    if (!syncObj) {
 457       _mesa_error(ctx, GL_INVALID_VALUE, "glGetSynciv (not a valid sync object)");
 458       return;
 459    }
 460
 461    switch (pname) {
 462    case GL_OBJECT_TYPE:
 463       v[0] = GL_SYNC_FENCE;
 464       size = 1;
 465       break;
 466
 467    case GL_SYNC_CONDITION:
 468       v[0] = syncObj->SyncCondition;
 469       size = 1;
 470       break;
 471
 472    case GL_SYNC_STATUS:
 473       /* Update the state of the sync by dipping into the driver.  Note that
 474        * this call won't block.  It just updates state in the common object
 475        * data from the current driver state.
 476        */
 477       ctx->Driver.CheckSync(ctx, syncObj);
 478
 479       v[0] = (syncObj->StatusFlag) ? GL_SIGNALED : GL_UNSIGNALED;
 480       size = 1;
 481       break;
 482
 483    case GL_SYNC_FLAGS:
 484       v[0] = syncObj->Flags;
 485       size = 1;
 486       break;
 487
 488    default:
 489       _mesa_error(ctx, GL_INVALID_ENUM, "glGetSynciv(pname=0x%x)\n", pname);
 490       _mesa_unref_sync_object(ctx, syncObj, 1);
 491       return;
 492    }
 493
 494    /* Section 4.1.3 (Sync Object Queries) of the OpenGL ES 3.10 spec says:
 495     *
 496     *    "An INVALID_VALUE error is generated if bufSize is negative."
 497     */
 498    if (bufSize < 0) {
 499       _mesa_error(ctx, GL_INVALID_VALUE, "glGetSynciv(pname=0x%x)\n", pname);
 500    }
 501
 502    if (size > 0 && bufSize > 0) {
 503       const GLsizei copy_count = MIN2(size, bufSize);
 504
 505       memcpy(values, v, sizeof(GLint) * copy_count);
 506    }
 507
 508    if (length != NULL) {
 509       *length = size;
 510    }
 511
 512    _mesa_unref_sync_object(ctx, syncObj, 1);
 513 }