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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.
#include <stddef.h>
#include <stdint.h>
namespace mojo {
namespace edk {
// 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;
// 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 edk
} // namespace mojo