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Implement shared memory WAL. (#71)

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- enabled by default on 64-bit macOS and Linux (`amd64`/`arm64`)
- depends on merged but unreleased wazero
- may cause small performance regression
- users may need WithMemoryLimitPages if not enough address space available
- needs docs
This commit is contained in:
Nuno Cruces
2024-04-10 13:15:36 +01:00
committed by GitHub
parent f1c376cb49
commit 11c03a16f9
40 changed files with 709 additions and 153 deletions
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62
sqlite3/vfs.c
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@@ -13,7 +13,7 @@ int go_sleep(sqlite3_vfs *, int microseconds);
int go_current_time_64(sqlite3_vfs *, sqlite3_int64 *);
int go_open(sqlite3_vfs *, sqlite3_filename zName, sqlite3_file *, int flags,
int *pOutFlags);
int *pOutFlags, int *pOutVFS);
int go_delete(sqlite3_vfs *, const char *zName, int syncDir);
int go_access(sqlite3_vfs *, const char *zName, int flags, int *pResOut);
int go_full_pathname(sqlite3_vfs *, const char *zName, int nOut, char *zOut);
@@ -32,29 +32,55 @@ int go_lock(sqlite3_file *, int eLock);
int go_unlock(sqlite3_file *, int eLock);
int go_check_reserved_lock(sqlite3_file *, int *pResOut);
int go_shm_map(sqlite3_file *, int iPg, int pgsz, int, void volatile **);
int go_shm_lock(sqlite3_file *, int offset, int n, int flags);
int go_shm_unmap(sqlite3_file *, int deleteFlag);
void go_shm_barrier(sqlite3_file *);
static int go_open_wrapper(sqlite3_vfs *vfs, sqlite3_filename zName,
sqlite3_file *file, int flags, int *pOutFlags) {
static const sqlite3_io_methods os_io = {
.iVersion = 1,
.xClose = go_close,
.xRead = go_read,
.xWrite = go_write,
.xTruncate = go_truncate,
.xSync = go_sync,
.xFileSize = go_file_size,
.xLock = go_lock,
.xUnlock = go_unlock,
.xCheckReservedLock = go_check_reserved_lock,
.xFileControl = go_file_control,
.xSectorSize = go_sector_size,
.xDeviceCharacteristics = go_device_characteristics,
};
static const sqlite3_io_methods go_io[2] = {
{
.iVersion = 1,
.xClose = go_close,
.xRead = go_read,
.xWrite = go_write,
.xTruncate = go_truncate,
.xSync = go_sync,
.xFileSize = go_file_size,
.xLock = go_lock,
.xUnlock = go_unlock,
.xCheckReservedLock = go_check_reserved_lock,
.xFileControl = go_file_control,
.xSectorSize = go_sector_size,
.xDeviceCharacteristics = go_device_characteristics,
},
{
.iVersion = 2,
.xClose = go_close,
.xRead = go_read,
.xWrite = go_write,
.xTruncate = go_truncate,
.xSync = go_sync,
.xFileSize = go_file_size,
.xLock = go_lock,
.xUnlock = go_unlock,
.xCheckReservedLock = go_check_reserved_lock,
.xFileControl = go_file_control,
.xSectorSize = go_sector_size,
.xDeviceCharacteristics = go_device_characteristics,
.xShmMap = go_shm_map,
.xShmLock = go_shm_lock,
.xShmBarrier = go_shm_barrier,
.xShmUnmap = go_shm_unmap,
}};
int vfsID = 0;
memset(file, 0, vfs->szOsFile);
int rc = go_open(vfs, zName, file, flags, pOutFlags);
int rc = go_open(vfs, zName, file, flags, pOutFlags, &vfsID);
if (rc) {
return rc;
}
file->pMethods = &os_io;
file->pMethods = &go_io[vfsID];
return SQLITE_OK;
}