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Nuno Cruces
2024-11-27 11:42:25 +00:00
parent 4ede2c7216
commit 1469cb9f1a
2 changed files with 7 additions and 6 deletions
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10
vfs/shm_copy.go
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@@ -13,7 +13,7 @@ const (
_WALINDEX_PGSZ = 32768
)
// This looks like a safe way of keeping the WAL-index in sync.
// This seems a safe way of keeping the WAL-index in sync.
//
// The WAL-index file starts with a header,
// and the index doesn't meaningfully change if the header doesn't change.
@@ -27,7 +27,7 @@ const (
//
// Since all the data is either redundant+checksummed,
// 4 byte aligned, or modified under an exclusive lock,
// the copies below should correctly keep copies in sync.
// the copies below should correctly keep memory in sync.
//
// https://sqlite.org/walformat.html#the_wal_index_file_format
@@ -35,7 +35,7 @@ func (s *vfsShm) shmAcquire(ptr *_ErrorCode) {
if ptr != nil && *ptr != _OK {
return
}
if len(s.ptrs) == 0 || shmUnmodified(s.shadow[0][:], s.shared[0][:]) {
if len(s.ptrs) == 0 || shmEqual(s.shadow[0][:], s.shared[0][:]) {
return
}
// Copies modified words from shared to private memory.
@@ -53,7 +53,7 @@ func (s *vfsShm) shmAcquire(ptr *_ErrorCode) {
}
func (s *vfsShm) shmRelease() {
if len(s.ptrs) == 0 || shmUnmodified(s.shadow[0][:], util.View(s.mod, s.ptrs[0], _WALINDEX_HDR_SIZE)) {
if len(s.ptrs) == 0 || shmEqual(s.shadow[0][:], util.View(s.mod, s.ptrs[0], _WALINDEX_HDR_SIZE)) {
return
}
// Copies modified words from private to shared memory.
@@ -82,6 +82,6 @@ func shmPage(s []byte) *[_WALINDEX_PGSZ / 4]uint32 {
return (*[_WALINDEX_PGSZ / 4]uint32)(unsafe.Slice(p, _WALINDEX_PGSZ/4))
}
func shmUnmodified(v1, v2 []byte) bool {
func shmEqual(v1, v2 []byte) bool {
return *(*[_WALINDEX_HDR_SIZE]byte)(v1[:]) == *(*[_WALINDEX_HDR_SIZE]byte)(v2[:])
}

3
vfs/shm_dotlk.go
View File

@@ -9,8 +9,9 @@ import (
"os"
"sync"
"github.com/ncruces/go-sqlite3/internal/util"
"github.com/tetratelabs/wazero/api"
"github.com/ncruces/go-sqlite3/internal/util"
)
type vfsShmParent struct {