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Get fault injection for testing working correctly. Other code clean-up.

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FossilOrigin-Name: ff492277ed00c1f637a5b4ccd6d8193ea22f6781f90073861588a2b7d5c045b7
This commit is contained in:
drh
2023-07-11 15:52:52 +00:00
parent c0b6112d04
commit 66422b57f9
3 changed files with 25 additions and 14 deletions
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23
src/wal.c
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@@ -528,15 +528,13 @@ struct Wal {
u32 iReCksum; /* On commit, recalculate checksums from here */
const char *zWalName; /* Name of WAL file */
u32 nCkpt; /* Checkpoint sequence counter in the wal-header */
# ifdef SQLITE_DEBUG
int nSehTry; /* Number of nested SEH_TRY{} blocks */
# endif
#ifdef SQLITE_USE_SEH
u32 lockMask; /* Mask of locks held */
void *pFree; /* Pointer to sqlite3_free() if exception thrown */
int iSysErrno; /* System error code following exception */
#endif
#ifdef SQLITE_DEBUG
int nSehTry; /* Number of nested SEH_TRY{} blocks */
u8 lockError; /* True if a locking error has occurred */
#endif
#ifdef SQLITE_ENABLE_SNAPSHOT
@@ -618,19 +616,32 @@ struct WalIterator {
sizeof(ht_slot)*HASHTABLE_NSLOT + HASHTABLE_NPAGE*sizeof(u32) \
)
/*
** Structured Exception Handling (SEH) is a Windows-specific technique
** for catching exceptions raised while accessing memory-mapped files.
**
** The -DSQLITE_USE_SEH compile-time option means to use SEH to catch and
** deal with system-level errors that arise during WAL -shm file processing.
** Without this compile-time option, any system-level faults that appear
** while accessing the memory-mapped -shm file will cause a process-wide
** signal to be deliver, which will more than likely cause the entire
** process to exit.
*/
#ifdef SQLITE_USE_SEH
#include <Windows.h>
/* Beginning of a block of code in which an exception might occur */
# define SEH_TRY __try { \
assert( walAssertLockmask(pWal) && pWal->nSehTry==0 ); \
VVA_ONLY(pWal->nSehTry++);
/* The end of a block of code in which an exception might occur */
# define SEH_EXCEPT(X) \
VVA_ONLY(pWal->nSehTry--); \
assert( pWal->nSehTry==0 ); \
} __except( sehExceptionFilter(pWal, GetExceptionCode(), GetExceptionInformation() ) ){ X }
/* Simulate a memory-mapping fault in the -shm file for testing purposes */
# define SEH_INJECT_FAULT sehInjectFault(pWal)
/*
@@ -662,10 +673,10 @@ static void sehInjectFault(Wal *pWal){
res = sqlite3FaultSim(650);
if( res!=0 ){
ULONG aArg[3];
ULONG_PTR aArg[3];
aArg[0] = 0;
aArg[1] = 0;
aArg[2] = (ULONG)res;
aArg[2] = (ULONG_PTR)res;
RaiseException(EXCEPTION_IN_PAGE_ERROR, 0, 3, (const ULONG_PTR*)aArg);
}
}