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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef MOJO_EDK_SYSTEM_CONSTANTS_H_ |
| 6 #define MOJO_EDK_SYSTEM_CONSTANTS_H_ |
| 7 |
| 8 #include <stddef.h> |
| 9 |
| 10 namespace mojo { |
| 11 namespace system { |
| 12 |
| 13 // Maximum number of open (Mojo) handles. |
| 14 // TODO(vtl): This doesn't count "live" handles, some of which may live in |
| 15 // messages. |
| 16 const size_t kMaxHandleTableSize = 1000000; |
| 17 |
| 18 // Maximum number of active memory mappings. |
| 19 const size_t kMaxMappingTableSize = 1000000; |
| 20 |
| 21 const size_t kMaxWaitManyNumHandles = kMaxHandleTableSize; |
| 22 |
| 23 const size_t kMaxMessageNumBytes = 4 * 1024 * 1024; |
| 24 |
| 25 const size_t kMaxMessageNumHandles = 10000; |
| 26 |
| 27 // Maximum capacity of a data pipe, in bytes. This value must fit into a |
| 28 // |uint32_t|. |
| 29 // WARNING: If you bump it closer to 2^32, you must audit all the code to check |
| 30 // that we don't overflow (2^31 would definitely be risky; up to 2^30 is |
| 31 // probably okay). |
| 32 const size_t kMaxDataPipeCapacityBytes = 256 * 1024 * 1024; // 256 MB. |
| 33 |
| 34 const size_t kDefaultDataPipeCapacityBytes = 1024 * 1024; // 1 MB. |
| 35 |
| 36 // Alignment for the "start" of the data buffer used by data pipes. (The |
| 37 // alignment of elements will depend on this and the element size.) |
| 38 const size_t kDataPipeBufferAlignmentBytes = 16; |
| 39 |
| 40 // TODO(vtl): Set this hard limit appropriately (e.g., higher on 64-bit). (This |
| 41 // will also entail some auditing to make sure I'm not messing up my checks |
| 42 // anywhere.) |
| 43 const size_t kMaxSharedMemoryNumBytes = 1024 * 1024 * 1024; // 1 GB. |
| 44 |
| 45 } // namespace system |
| 46 } // namespace mojo |
| 47 |
| 48 #endif // MOJO_EDK_SYSTEM_CONSTANTS_H_ |
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