Mesa (master): mesa: Remove unnecessary locking from container objects.

[Timothy Arceri]

Module: Mesa
Branch: master
Commit: 0b2750620b65f9a5fd56ed857ddfef5fafec0894
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=0b2750620b65f9a5fd56ed857ddfef5fafec0894

Author: Matt Turner <mattst88 at gmail.com>
Date:   Fri Apr 21 13:48:38 2017 +1000

mesa: Remove unnecessary locking from container objects.

>From Chapter 5 'Shared Objects and Multiple Contexts' of
the OpenGL 4.5 spec:

   "Objects which contain references to other objects include
   framebuffer, program pipeline, query, transform feedback,
   and vertex array objects.   Such objects are called container
   objects and are not shared"

For we leave locking in place for framebuffer objects because
the EXT fbo extension allowed sharing.

V2: (Timothy Arceri)
 - rebased and dropped changes to framebuffer objects

Reviewed-by: Nicolai Hähnle <nicolai.haehnle at amd.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>

---

 src/mesa/main/arrayobj.c    | 6 ------
 src/mesa/main/mtypes.h      | 4 ----
 src/mesa/main/pipelineobj.c | 6 ------
 src/mesa/main/shaderapi.c   | 3 ---
 4 files changed, 19 deletions(-)

diff --git a/src/mesa/main/arrayobj.c b/src/mesa/main/arrayobj.c
index fdb3caad95..9f4477e45b 100644
--- a/src/mesa/main/arrayobj.c
+++ b/src/mesa/main/arrayobj.c
@@ -169,7 +169,6 @@ _mesa_delete_vao(struct gl_context *ctx, struct gl_vertex_array_object *obj)
 {
    unbind_array_object_vbos(ctx, obj);
    _mesa_reference_buffer_object(ctx, &obj->IndexBufferObj, NULL);
-   mtx_destroy(&obj->Mutex);
    free(obj->Label);
    free(obj);
 }
@@ -192,11 +191,9 @@ _mesa_reference_vao_(struct gl_context *ctx,
       GLboolean deleteFlag = GL_FALSE;
       struct gl_vertex_array_object *oldObj = *ptr;
 
-      mtx_lock(&oldObj->Mutex);
       assert(oldObj->RefCount > 0);
       oldObj->RefCount--;
       deleteFlag = (oldObj->RefCount == 0);
-      mtx_unlock(&oldObj->Mutex);
 
       if (deleteFlag)
          _mesa_delete_vao(ctx, oldObj);
@@ -207,12 +204,10 @@ _mesa_reference_vao_(struct gl_context *ctx,
 
    if (vao) {
       /* reference new array object */
-      mtx_lock(&vao->Mutex);
       assert(vao->RefCount > 0);
 
       vao->RefCount++;
       *ptr = vao;
-      mtx_unlock(&vao->Mutex);
    }
 }
 
@@ -268,7 +263,6 @@ _mesa_initialize_vao(struct gl_context *ctx,
 
    vao->Name = name;
 
-   mtx_init(&vao->Mutex, mtx_plain);
    vao->RefCount = 1;
 
    /* Init the individual arrays */
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index c4fab9dbac..b3711ba256 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1509,8 +1509,6 @@ struct gl_vertex_array_object
 
    GLchar *Label;       /**< GL_KHR_debug */
 
-   mtx_t Mutex;
-
    /**
     * Does the VAO use ARB semantics or Apple semantics?
     *
@@ -3001,8 +2999,6 @@ struct gl_pipeline_object
 
    GLint RefCount;
 
-   mtx_t Mutex;
-
    GLchar *Label;   /**< GL_KHR_debug */
 
    /**
diff --git a/src/mesa/main/pipelineobj.c b/src/mesa/main/pipelineobj.c
index 2988c97455..a0fa55a85c 100644
--- a/src/mesa/main/pipelineobj.c
+++ b/src/mesa/main/pipelineobj.c
@@ -66,7 +66,6 @@ _mesa_delete_pipeline_object(struct gl_context *ctx,
    }
 
    _mesa_reference_shader_program(ctx, &obj->ActiveProgram, NULL);
-   mtx_destroy(&obj->Mutex);
    free(obj->Label);
    ralloc_free(obj);
 }
@@ -80,7 +79,6 @@ _mesa_new_pipeline_object(struct gl_context *ctx, GLuint name)
    struct gl_pipeline_object *obj = rzalloc(NULL, struct gl_pipeline_object);
    if (obj) {
       obj->Name = name;
-      mtx_init(&obj->Mutex, mtx_plain);
       obj->RefCount = 1;
       obj->Flags = _mesa_get_shader_flags();
       obj->InfoLog = NULL;
@@ -189,11 +187,9 @@ _mesa_reference_pipeline_object_(struct gl_context *ctx,
       GLboolean deleteFlag = GL_FALSE;
       struct gl_pipeline_object *oldObj = *ptr;
 
-      mtx_lock(&oldObj->Mutex);
       assert(oldObj->RefCount > 0);
       oldObj->RefCount--;
       deleteFlag = (oldObj->RefCount == 0);
-      mtx_unlock(&oldObj->Mutex);
 
       if (deleteFlag) {
          _mesa_delete_pipeline_object(ctx, oldObj);
@@ -205,12 +201,10 @@ _mesa_reference_pipeline_object_(struct gl_context *ctx,
 
    if (obj) {
       /* reference new pipeline object */
-      mtx_lock(&obj->Mutex);
       assert(obj->RefCount > 0);
 
       obj->RefCount++;
       *ptr = obj;
-      mtx_unlock(&obj->Mutex);
    }
 }
 
diff --git a/src/mesa/main/shaderapi.c b/src/mesa/main/shaderapi.c
index 187475f127..c41f006eb7 100644
--- a/src/mesa/main/shaderapi.c
+++ b/src/mesa/main/shaderapi.c
@@ -138,8 +138,6 @@ _mesa_init_shader_state(struct gl_context *ctx)
 
    /* Extended for ARB_separate_shader_objects */
    ctx->Shader.RefCount = 1;
-   mtx_init(&ctx->Shader.Mutex, mtx_plain);
-
    ctx->TessCtrlProgram.patch_vertices = 3;
    for (i = 0; i < 4; ++i)
       ctx->TessCtrlProgram.patch_default_outer_level[i] = 1.0;
@@ -164,7 +162,6 @@ _mesa_free_shader_state(struct gl_context *ctx)
    _mesa_reference_pipeline_object(ctx, &ctx->_Shader, NULL);
 
    assert(ctx->Shader.RefCount == 1);
-   mtx_destroy(&ctx->Shader.Mutex);
 }