src/gallium/state_trackers/glx/dri/dri_lock.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 #include "pipe/p_thread.h"
  30 #include "dri_context.h"
  31 #include "xf86drm.h"
  32
  33 pipe_static_mutex( lockMutex );
  34
  35 static void
  36 dri_contended_lock(struct dri_context *ctx)
  37 {
  38    __DRIdrawablePrivate *dPriv = ctx->dPriv;
  39    __DRIcontextPrivate *cPriv = ctx->cPriv;
  40    __DRIscreenPrivate *sPriv = cPriv->driScreenPriv;
  41
  42    drmGetLock(sPriv->fd, cPriv->hHWContext, 0);
  43
  44    /* Perform round trip communication with server (including dropping
  45     * and retaking the above lock) to update window dimensions:
  46     */
  47    if (dPriv)
  48       DRI_VALIDATE_DRAWABLE_INFO(sPriv, dPriv);
  49 }
  50
  51
  52 /* Lock the hardware and validate our state.
  53  */
  54 void dri_lock_hardware( struct dri_context *ctx )
  55 {
  56    __DRIcontextPrivate *cPriv = ctx->cPriv;
  57    __DRIscreenPrivate *sPriv = cPriv->driScreenPriv;
  58    char __ret = 0;
  59
  60    pipe_mutex_lock(lockMutex);
  61    assert(!ctx->locked);
  62
  63    DRM_CAS((drmLock *) &sPriv->pSAREA->lock,
  64            cPriv->hHWContext,
  65            (DRM_LOCK_HELD | cPriv->hHWContext),
  66            __ret);
  67
  68    if (__ret)
  69       dri_contended_lock( ctx );
  70
  71    ctx->locked = TRUE;
  72 }
  73
  74
  75 /* Unlock the hardware using the global current context
  76  */
  77 void dri_unlock_hardware( struct dri_context *ctx )
  78 {
  79    __DRIcontextPrivate *cPriv = ctx->cPriv;
  80    __DRIscreenPrivate *sPriv = cPriv->driScreenPriv;
  81
  82    assert(ctx->locked);
  83    ctx->locked = FALSE;
  84
  85    DRM_UNLOCK(sPriv->fd,
  86               (drmLock *) &sPriv->pSAREA->lock,
  87               cPriv->hHWContext);
  88
  89    pipe_mutex_unlock(lockMutex);
  90 }