| // 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_ |