projects / thirdparty / squid.git / blame
| Commit | Line | Data |
|---|---|---|
| 3e0ddf16 AR |
1 | /* |
| 2 | * $Id$ | |
| 3 | * | |
| 4 | */ | |
| 5 | ||
| 6 | #ifndef SQUID_IPC_MEM_PAGES_H | |
| 7 | #define SQUID_IPC_MEM_PAGES_H | |
| 8 | ||
| 9 | namespace Ipc { | |
| 10 | ||
| 11 | namespace Mem { | |
| 12 | ||
| 13 | class PageId; | |
| 14 | ||
| 15 | /// initializes and configures shared memory [pools] for all kids | |
| 16 | void Init(); | |
| 17 | ||
| 18 | /// attaches this kid to the already configured shared memory [pools] | |
| 19 | void Attach(); | |
| 20 | ||
| 21 | ||
| 22 | /* Single page manipulation */ | |
| 23 | ||
| 24 | /// sets page ID and returns true unless no free pages are found | |
| 25 | bool GetPage(PageId &page); | |
| 26 | ||
| 27 | /// makes identified page available as a free page to future GetPage() callers | |
| 56f8aa50 | 28 | void PutPage(PageId &page); |
| 3e0ddf16 AR |
29 | |
| 30 | /// converts page handler into a temporary writeable shared memory pointer | |
| 31 | void *PagePointer(const PageId &page); | |
| 32 | ||
| 33 | ||
| 34 | /* Limits and statistics */ | |
| 35 | ||
| 36 | /// the total number of shared memory bytes that can be in use at any time | |
| 37 | uint64_t Limit(); | |
| 38 | ||
| 39 | /// approximate total number of shared memory bytes used now | |
| 40 | uint64_t Level(); | |
| 41 | ||
| 42 | /// approximate total number of shared memory bytes we can allocate now | |
| 43 | inline uint64_t Available() { return Limit() - Level(); } | |
| 44 | ||
| 45 | } // namespace Mem | |
| 46 | ||
| 47 | } // namespace Ipc | |
| 48 | ||
| 49 | #endif // SQUID_IPC_MEM_PAGES_H |