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-rw-r--r--src/mesa/main/syncobj.c409
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+/*
+ * 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 "glheader.h"
+#include "imports.h"
+#include "context.h"
+#include "macros.h"
+
+#if FEATURE_ARB_sync
+#include "syncobj.h"
+
+static struct gl_sync_object *
+_mesa_new_sync_object(GLcontext *ctx, GLenum type)
+{
+ struct gl_sync_object *s = MALLOC_STRUCT(gl_sync_object);
+ (void) ctx;
+ (void) type;
+
+ return s;
+}
+
+
+static void
+_mesa_delete_sync_object(GLcontext *ctx, struct gl_sync_object *syncObj)
+{
+ (void) ctx;
+ _mesa_free(syncObj);
+}
+
+
+static void
+_mesa_fence_sync(GLcontext *ctx, struct gl_sync_object *syncObj,
+ GLenum condition, GLbitfield flags)
+{
+ (void) ctx;
+ (void) condition;
+ (void) flags;
+
+ syncObj->StatusFlag = 1;
+}
+
+
+static void
+_mesa_check_sync(GLcontext *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(GLcontext *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(GLcontext *ctx)
+{
+ (void) ctx;
+}
+
+
+/**
+ * Free the context state related to sync objects.
+ */
+void
+_mesa_free_sync_data(GLcontext *ctx)
+{
+ (void) ctx;
+}
+
+
+static int
+_mesa_validate_sync(struct gl_sync_object *syncObj)
+{
+ return (syncObj != NULL)
+ && (syncObj->Type == GL_SYNC_FENCE)
+ && !syncObj->DeletePending;
+}
+
+
+void
+_mesa_ref_sync_object(GLcontext *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(GLcontext *ctx, struct gl_sync_object *syncObj)
+{
+ _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
+ syncObj->RefCount--;
+ if (syncObj->RefCount == 0) {
+ remove_from_list(& syncObj->link);
+ _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
+
+ ctx->Driver.DeleteSyncObject(ctx, syncObj);
+ } else {
+ _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
+ }
+}
+
+
+GLboolean
+_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(syncObj) ? GL_TRUE : GL_FALSE;
+}
+
+
+void
+_mesa_DeleteSync(GLsync sync)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ struct gl_sync_object *const syncObj = (struct gl_sync_object *) sync;
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ /* 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(syncObj)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glDeleteSync");
+ 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
+_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);
+ insert_at_tail(& ctx->Shared->SyncObjects, & syncObj->link);
+ _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
+
+ return (GLsync) syncObj;
+ }
+
+ return NULL;
+}
+
+
+GLenum
+_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(syncObj)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glClientWaitSync");
+ return GL_WAIT_FAILED;
+ }
+
+ if ((flags & ~GL_SYNC_FLUSH_COMMANDS_BIT) != 0) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "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 {
+ 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
+_mesa_WaitSync(GLsync sync, GLbitfield flags, GLuint64 timeout)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ struct gl_sync_object *const syncObj = (struct gl_sync_object *) sync;
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (!_mesa_validate_sync(syncObj)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glWaitSync");
+ return;
+ }
+
+ if (flags != 0) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glWaitSync(flags=0x%x)", flags);
+ return;
+ }
+
+ /* From the GL_ARB_sync spec:
+ *
+ * If the value of <timeout> is zero, then WaitSync does nothing.
+ */
+ if (timeout == 0) {
+ return;
+ }
+
+ ctx->Driver.ServerWaitSync(ctx, syncObj, flags, timeout);
+}
+
+
+void
+_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];
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (!_mesa_validate_sync(syncObj)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glGetSynciv");
+ 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);
+
+ _mesa_memcpy(values, v, sizeof(GLint) * copy_count);
+ }
+
+ if (length != NULL) {
+ *length = size;
+ }
+}
+
+#endif /* FEATURE_ARB_sync */
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