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 "mfeatures.h"
  64 #include "get.h"
  65 #include "dispatch.h"
  66 #include "mtypes.h"
  67 #include "set.h"
  68 #include "hash_table.h"
  69
  70 #include "syncobj.h"
  71
  72 static struct gl_sync_object *
  73 _mesa_new_sync_object(struct gl_context *ctx, GLenum type)
  74 {
  75    struct gl_sync_object *s = MALLOC_STRUCT(gl_sync_object);
  76    (void) ctx;
  77    (void) type;
  78
  79    return s;
  80 }
  81
  82
  83 static void
  84 _mesa_delete_sync_object(struct gl_context *ctx, struct gl_sync_object *syncObj)
  85 {
  86    (void) ctx;
  87    free(syncObj);
  88 }
  89
  90
  91 static void
  92 _mesa_fence_sync(struct gl_context *ctx, struct gl_sync_object *syncObj,
  93                  GLenum condition, GLbitfield flags)
  94 {
  95    (void) ctx;
  96    (void) condition;
  97    (void) flags;
  98
  99    syncObj->StatusFlag = 1;
 100 }
 101
 102
 103 static void
 104 _mesa_check_sync(struct gl_context *ctx, struct gl_sync_object *syncObj)
 105 {
 106    (void) ctx;
 107    (void) syncObj;
 108
 109    /* No-op for software rendering.  Hardware drivers will need to determine
 110     * whether the state of the sync object has changed.
 111     */
 112 }
 113
 114
 115 static void
 116 _mesa_wait_sync(struct gl_context *ctx, struct gl_sync_object *syncObj,
 117                 GLbitfield flags, GLuint64 timeout)
 118 {
 119    (void) ctx;
 120    (void) syncObj;
 121    (void) flags;
 122    (void) timeout;
 123
 124    /* No-op for software rendering.  Hardware drivers will need to wait until
 125     * the state of the sync object changes or the timeout expires.
 126     */
 127 }
 128
 129
 130 void
 131 _mesa_init_sync_object_functions(struct dd_function_table *driver)
 132 {
 133    driver->NewSyncObject = _mesa_new_sync_object;
 134    driver->FenceSync = _mesa_fence_sync;
 135    driver->DeleteSyncObject = _mesa_delete_sync_object;
 136    driver->CheckSync = _mesa_check_sync;
 137
 138    /* Use the same no-op wait function for both.
 139     */
 140    driver->ClientWaitSync = _mesa_wait_sync;
 141    driver->ServerWaitSync = _mesa_wait_sync;
 142 }
 143
 144
 145 void
 146 _mesa_init_sync_dispatch(struct _glapi_table *disp)
 147 {
 148    SET_IsSync(disp, _mesa_IsSync);
 149    SET_DeleteSync(disp, _mesa_DeleteSync);
 150    SET_FenceSync(disp, _mesa_FenceSync);
 151    SET_ClientWaitSync(disp, _mesa_ClientWaitSync);
 152    SET_WaitSync(disp, _mesa_WaitSync);
 153    SET_GetInteger64v(disp, _mesa_GetInteger64v);
 154    SET_GetSynciv(disp, _mesa_GetSynciv);
 155 }
 156
 157
 158 /**
 159  * Allocate/init the context state related to sync objects.
 160  */
 161 void
 162 _mesa_init_sync(struct gl_context *ctx)
 163 {
 164    (void) ctx;
 165 }
 166
 167
 168 /**
 169  * Free the context state related to sync objects.
 170  */
 171 void
 172 _mesa_free_sync_data(struct gl_context *ctx)
 173 {
 174    (void) ctx;
 175 }
 176
 177
 178 static int
 179 _mesa_validate_sync(struct gl_context *ctx, struct gl_sync_object *syncObj)
 180 {
 181    return (syncObj != NULL)
 182       && _mesa_set_search(ctx->Shared->SyncObjects,
 183                           _mesa_hash_pointer(syncObj),
 184                           syncObj) != NULL
 185       && (syncObj->Type == GL_SYNC_FENCE)
 186       && !syncObj->DeletePending;
 187 }
 188
 189
 190 void
 191 _mesa_ref_sync_object(struct gl_context *ctx, struct gl_sync_object *syncObj)
 192 {
 193    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
 194    syncObj->RefCount++;
 195    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
 196 }
 197
 198
 199 void
 200 _mesa_unref_sync_object(struct gl_context *ctx, struct gl_sync_object *syncObj)
 201 {
 202    struct set_entry *entry;
 203
 204    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
 205    syncObj->RefCount--;
 206    if (syncObj->RefCount == 0) {
 207       entry = _mesa_set_search(ctx->Shared->SyncObjects,
 208                                _mesa_hash_pointer(syncObj),
 209                                syncObj);
 210       assert (entry != NULL);
 211       _mesa_set_remove(ctx->Shared->SyncObjects, entry);
 212       _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
 213
 214       ctx->Driver.DeleteSyncObject(ctx, syncObj);
 215    } else {
 216       _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
 217    }
 218 }
 219
 220
 221 GLboolean GLAPIENTRY
 222 _mesa_IsSync(GLsync sync)
 223 {
 224    GET_CURRENT_CONTEXT(ctx);
 225    struct gl_sync_object *const syncObj = (struct gl_sync_object *) sync;
 226    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 227
 228    return _mesa_validate_sync(ctx, syncObj) ? GL_TRUE : GL_FALSE;
 229 }
 230
 231
 232 void GLAPIENTRY
 233 _mesa_DeleteSync(GLsync sync)
 234 {
 235    GET_CURRENT_CONTEXT(ctx);
 236    struct gl_sync_object *const syncObj = (struct gl_sync_object *) sync;
 237
 238    /* From the GL_ARB_sync spec:
 239     *
 240     *    DeleteSync will silently ignore a <sync> value of zero. An
 241     *    INVALID_VALUE error is generated if <sync> is neither zero nor the
 242     *    name of a sync object.
 243     */
 244    if (sync == 0) {
 245       return;
 246    }
 247
 248    if (!_mesa_validate_sync(ctx, syncObj)) {
 249       _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteSync (not a valid sync object)");
 250       return;
 251    }
 252
 253    /* If there are no client-waits or server-waits pending on this sync, delete
 254     * the underlying object.
 255     */
 256    syncObj->DeletePending = GL_TRUE;
 257    _mesa_unref_sync_object(ctx, syncObj);
 258 }
 259
 260
 261 GLsync GLAPIENTRY
 262 _mesa_FenceSync(GLenum condition, GLbitfield flags)
 263 {
 264    GET_CURRENT_CONTEXT(ctx);
 265    struct gl_sync_object *syncObj;
 266    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
 267
 268    if (condition != GL_SYNC_GPU_COMMANDS_COMPLETE) {
 269       _mesa_error(ctx, GL_INVALID_ENUM, "glFenceSync(condition=0x%x)",
 270                   condition);
 271       return 0;
 272    }
 273
 274    if (flags != 0) {
 275       _mesa_error(ctx, GL_INVALID_VALUE, "glFenceSync(flags=0x%x)",
 276                   condition);
 277       return 0;
 278    }
 279
 280    syncObj = ctx->Driver.NewSyncObject(ctx, GL_SYNC_FENCE);
 281    if (syncObj != NULL) {
 282       syncObj->Type = GL_SYNC_FENCE;
 283       /* The name is not currently used, and it is never visible to
 284        * applications.  If sync support is extended to provide support for
 285        * NV_fence, this field will be used.  We'll also need to add an object
 286        * ID hashtable.
 287        */
 288       syncObj->Name = 1;
 289       syncObj->RefCount = 1;
 290       syncObj->DeletePending = GL_FALSE;
 291       syncObj->SyncCondition = condition;
 292       syncObj->Flags = flags;
 293       syncObj->StatusFlag = 0;
 294
 295       ctx->Driver.FenceSync(ctx, syncObj, condition, flags);
 296
 297       _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
 298       _mesa_set_add(ctx->Shared->SyncObjects,
 299                     _mesa_hash_pointer(syncObj),
 300                     syncObj);
 301       _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
 302
 303       return (GLsync) syncObj;
 304    }
 305
 306    return NULL;
 307 }
 308
 309
 310 GLenum GLAPIENTRY
 311 _mesa_ClientWaitSync(GLsync sync, GLbitfield flags, GLuint64 timeout)
 312 {
 313    GET_CURRENT_CONTEXT(ctx);
 314    struct gl_sync_object *const syncObj = (struct gl_sync_object *) sync;
 315    GLenum ret;
 316    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_WAIT_FAILED);
 317
 318    if (!_mesa_validate_sync(ctx, syncObj)) {
 319       _mesa_error(ctx, GL_INVALID_VALUE, "glClientWaitSync (not a valid sync object)");
 320       return GL_WAIT_FAILED;
 321    }
 322
 323    if ((flags & ~GL_SYNC_FLUSH_COMMANDS_BIT) != 0) {
 324       _mesa_error(ctx, GL_INVALID_VALUE, "glClientWaitSync(flags=0x%x)", flags);
 325       return GL_WAIT_FAILED;
 326    }
 327
 328    _mesa_ref_sync_object(ctx, syncObj);
 329
 330    /* From the GL_ARB_sync spec:
 331     *
 332     *    ClientWaitSync returns one of four status values. A return value of
 333     *    ALREADY_SIGNALED indicates that <sync> was signaled at the time
 334     *    ClientWaitSync was called. ALREADY_SIGNALED will always be returned
 335     *    if <sync> was signaled, even if the value of <timeout> is zero.
 336     */
 337    ctx->Driver.CheckSync(ctx, syncObj);
 338    if (syncObj->StatusFlag) {
 339       ret = GL_ALREADY_SIGNALED;
 340    } else {
 341       if (timeout == 0) {
 342          ret = GL_TIMEOUT_EXPIRED;
 343       } else {
 344          ctx->Driver.ClientWaitSync(ctx, syncObj, flags, timeout);
 345
 346          ret = syncObj->StatusFlag ? GL_CONDITION_SATISFIED : GL_TIMEOUT_EXPIRED;
 347       }
 348    }
 349
 350    _mesa_unref_sync_object(ctx, syncObj);
 351    return ret;
 352 }
 353
 354
 355 void GLAPIENTRY
 356 _mesa_WaitSync(GLsync sync, GLbitfield flags, GLuint64 timeout)
 357 {
 358    GET_CURRENT_CONTEXT(ctx);
 359    struct gl_sync_object *const syncObj = (struct gl_sync_object *) sync;
 360
 361    if (!_mesa_validate_sync(ctx, syncObj)) {
 362       _mesa_error(ctx, GL_INVALID_VALUE, "glWaitSync (not a valid sync object)");
 363       return;
 364    }
 365
 366    if (flags != 0) {
 367       _mesa_error(ctx, GL_INVALID_VALUE, "glWaitSync(flags=0x%x)", flags);
 368       return;
 369    }
 370
 371    if (timeout != GL_TIMEOUT_IGNORED) {
 372       _mesa_error(ctx, GL_INVALID_VALUE, "glWaitSync(timeout=0x%" PRIx64 ")",
 373                   (uint64_t) timeout);
 374       return;
 375    }
 376
 377    ctx->Driver.ServerWaitSync(ctx, syncObj, flags, timeout);
 378 }
 379
 380
 381 void GLAPIENTRY
 382 _mesa_GetSynciv(GLsync sync, GLenum pname, GLsizei bufSize, GLsizei *length,
 383                 GLint *values)
 384 {
 385    GET_CURRENT_CONTEXT(ctx);
 386    struct gl_sync_object *const syncObj = (struct gl_sync_object *) sync;
 387    GLsizei size = 0;
 388    GLint v[1];
 389
 390    if (!_mesa_validate_sync(ctx, syncObj)) {
 391       _mesa_error(ctx, GL_INVALID_VALUE, "glGetSynciv (not a valid sync object)");
 392       return;
 393    }
 394
 395    switch (pname) {
 396    case GL_OBJECT_TYPE:
 397       v[0] = syncObj->Type;
 398       size = 1;
 399       break;
 400
 401    case GL_SYNC_CONDITION:
 402       v[0] = syncObj->SyncCondition;
 403       size = 1;
 404       break;
 405
 406    case GL_SYNC_STATUS:
 407       /* Update the state of the sync by dipping into the driver.  Note that
 408        * this call won't block.  It just updates state in the common object
 409        * data from the current driver state.
 410        */
 411       ctx->Driver.CheckSync(ctx, syncObj);
 412
 413       v[0] = (syncObj->StatusFlag) ? GL_SIGNALED : GL_UNSIGNALED;
 414       size = 1;
 415       break;
 416
 417    case GL_SYNC_FLAGS:
 418       v[0] = syncObj->Flags;
 419       size = 1;
 420       break;
 421
 422    default:
 423       _mesa_error(ctx, GL_INVALID_ENUM, "glGetSynciv(pname=0x%x)\n", pname);
 424       return;
 425    }
 426
 427    if (size > 0) {
 428       const GLsizei copy_count = MIN2(size, bufSize);
 429
 430       memcpy(values, v, sizeof(GLint) * copy_count);
 431    }
 432
 433    if (length != NULL) {
 434       *length = size;
 435    }
 436 }