Index: mojo/edk/embedder/configuration.h |
diff --git a/mojo/edk/embedder/configuration.h b/mojo/edk/embedder/configuration.h |
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+// Copyright 2014 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef MOJO_EDK_EMBEDDER_CONFIGURATION_H_ |
+#define MOJO_EDK_EMBEDDER_CONFIGURATION_H_ |
+ |
+#include <stddef.h> |
+ |
+namespace mojo { |
+namespace embedder { |
+ |
+// A set of constants that the Mojo system internally uses. These values should |
+// be consistent across all processes on the same system. |
+// |
+// In general, there should be no need to change these values from their |
+// defaults. However, if you do change them, you must do so before |
+// initialization. |
+struct Configuration { |
+ // Maximum number of open (Mojo) handles. The default is 1,000,000. |
+ // |
+ // TODO(vtl): This doesn't count "live" handles, some of which may live in |
+ // messages. |
+ size_t max_handle_table_size; |
+ |
+ // Maximum number of active memory mappings. The default is 1,000,000. |
+ size_t max_mapping_table_sze; |
+ |
+ // Upper limit of |MojoWaitMany()|'s |num_handles|. The default is 1,000,000. |
+ // Must be same as or smaller than |max_handle_table_size|. |
+ size_t max_wait_many_num_handles; |
+ |
+ // Maximum data size of messages sent over message pipes, in bytes. The |
+ // default is 4MB. |
+ size_t max_message_num_bytes; |
+ |
+ // Maximum number of handles that can be attached to messages sent over |
+ // message pipes. The default is 10,000. |
+ size_t max_message_num_handles; |
+ |
+ // Maximum capacity of a data pipe, in bytes. The default is 256MB. This value |
+ // must fit into a |uint32_t|. WARNING: If you bump it closer to 2^32, you |
+ // must audit all the code to check that we don't overflow (2^31 would |
+ // definitely be risky; up to 2^30 is probably okay). |
+ size_t max_data_pipe_capacity_bytes; |
+ |
+ // Default data pipe capacity, if not specified explicitly in the creation |
+ // options. The default is 1MB. |
+ size_t default_data_pipe_capacity_bytes; |
+ |
+ // Alignment for the "start" of the data buffer used by data pipes. (The |
+ // alignment of elements will depend on this and the element size.) The |
+ // default is 16 bytes. |
+ size_t data_pipe_buffer_alignment_bytes; |
+ |
+ // Maximum size of a single shared memory segment, in bytes. The default is |
+ // 1GB. |
+ // |
+ // TODO(vtl): Set this hard limit appropriately (e.g., higher on 64-bit). |
+ // (This will also entail some auditing to make sure I'm not messing up my |
+ // checks anywhere.) |
+ size_t max_shared_memory_num_bytes; |
+}; |
+ |
+} // namespace embedder |
+} // namespace mojo |
+ |
+#endif // MOJO_EDK_EMBEDDER_CONFIGURATION_H_ |