nine: Implement threadpool

DRI_PRIME setups have different issues due the lack of dma-buf fences
support in the drivers. For DRI3 DRI_PRIME, a race can appear, making
tearings visible, or worse showing older content than expected. Until
dma-buf fences are well supported (and by all drivers), an alternative
is to send the buffers to the server only when rendering has finished.
Since waiting the rendering has finished in the main thread has a
performance impact, this patch uses an additional thread to offload the
wait and the sending of the buffers to the server.

Acked-by: Jose Fonseca <[email protected]>
Reviewed-by: David Heidelberg <[email protected]>
Signed-off-by: Axel Davy <[email protected]>

1 files changed, 55 insertions, 0 deletions

diff --git a/src/gallium/state_trackers/nine/threadpool.h b/src/gallium/state_trackers/nine/threadpool.h
new file mode 100644
index 00000000000..00ad25e1b13
--- /dev/null
+++ b/src/gallium/state_trackers/nine/threadpool.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright © 2012 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.
+ */
+
+#ifndef _THREADPOOL_H_
+#define _THREADPOOL_H_
+
+#define MAXTHREADS 1
+
+struct threadpool {
+    pthread_mutex_t m;
+    pthread_cond_t new_work;
+
+    pthread_t thread;
+    struct threadpool_task *workqueue;
+    BOOL shutdown;
+};
+
+typedef void (*threadpool_task_func)(void *data);
+
+struct threadpool_task {
+    threadpool_task_func work;
+    void *data;
+    struct threadpool_task *next;
+    pthread_cond_t finish;
+    BOOL finished;
+};
+
+struct threadpool *_mesa_threadpool_create(void);
+void _mesa_threadpool_destroy(struct threadpool *pool);
+struct threadpool_task *_mesa_threadpool_queue_task(struct threadpool *pool,
+                                                    threadpool_task_func func,
+                                                    void *data);
+void _mesa_threadpool_wait_for_task(struct threadpool *pool,
+                                    struct threadpool_task **task);
+#endif
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