1 /** @file snapshotimp.h
2 * @brief Snapshotting implementation header file..
5 #ifndef __SNAPSHOTIMP_H__
6 #define __SNAPSHOTIMP_H__
12 #if USE_MPROTECT_SNAPSHOT
13 //Each snapshotrecord lists the firstbackingpage that must be written to revert to that snapshot
14 struct SnapShotRecord {
15 unsigned int firstBackingPage;
18 /** @brief Backing store page */
19 typedef unsigned char snapshot_page_t[PAGESIZE];
21 //List the base address of the corresponding page in the backing store so we know where to copy it to
22 struct BackingPageRecord {
26 //Stuct for each memory region
28 void *basePtr; //base of memory region
29 int sizeInPages; //size of memory region in pages
32 //Primary struct for snapshotting system....
34 struct MemoryRegion *regionsToSnapShot; //This pointer references an array of memory regions to snapshot
35 snapshot_page_t *backingStore; //This pointer references an array of snapshotpage's that form the backing store
36 void *backingStoreBasePtr; //This pointer references an array of snapshotpage's that form the backing store
37 struct BackingPageRecord *backingRecords; //This pointer references an array of backingpagerecord's (same number of elements as backingstore
38 struct SnapShotRecord *snapShots; //This pointer references the snapshot array
40 unsigned int lastSnapShot; //Stores the next snapshot record we should use
41 unsigned int lastBackingPage; //Stores the next backingpage we should use
42 unsigned int lastRegion; //Stores the next memory region to be used
44 unsigned int maxRegions; //Stores the max number of memory regions we support
45 unsigned int maxBackingPages; //Stores the total number of backing pages
46 unsigned int maxSnapShots; //Stores the total number of snapshots we allow
53 #define SHARED_MEMORY_DEFAULT (100 * ((size_t)1 << 20)) // 100mb for the shared memory
54 #define STACK_SIZE_DEFAULT (((size_t)1 << 20) * 20) // 20 mb out of the above 100 mb for my stack
57 void *mSharedMemoryBase;
60 volatile snapshot_id mIDToRollback;
61 ucontext_t mContextToRollback;
62 snapshot_id currSnapShotID;
66 //Global reference to snapshot data structure
67 extern struct SnapShot *snapshotrecord;
69 #endif /* __SNAPSHOTIMP_H__ */