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BSD WAL fixes.

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This commit is contained in:
Nuno Cruces
2024-06-05 11:01:39 +01:00
parent 79c83cdce5
commit 9b769d94d0
1 changed files with 23 additions and 25 deletions
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48
vfs/shm_bsd.go
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@@ -20,11 +20,7 @@ import (
// [EXCLUSIVE locking mode]: https://sqlite.org/pragma.html#pragma_locking_mode
const SupportsSharedMemory = true
const (
_SHM_NLOCK = 8
_SHM_BASE = 120
_SHM_DMS = _SHM_BASE + _SHM_NLOCK
)
const _SHM_NLOCK = 8
func (f *vfsFile) SharedMemory() SharedMemory { return f.shm }
@@ -100,22 +96,19 @@ func (s *vfsShm) Close() error {
return err
}
func (s *vfsShm) shmOpen() error {
func (s *vfsShm) shmOpen() (err error) {
if s.vfsShmFile != nil {
return nil
}
var flag int
if s.readOnly {
flag = unix.O_RDONLY
} else {
flag = unix.O_RDWR
}
// Open file read-write, as it will be shared.
f, err := os.OpenFile(s.path,
flag|unix.O_CREAT|unix.O_NOFOLLOW, 0666)
unix.O_RDWR|unix.O_CREAT|unix.O_NOFOLLOW, 0666)
if err != nil {
return _CANTOPEN
}
// Close if file if it's not nil.
defer func() { f.Close() }()
fi, err := f.Stat()
if err != nil {
@@ -125,19 +118,34 @@ func (s *vfsShm) shmOpen() error {
vfsShmFilesMtx.Lock()
defer vfsShmFilesMtx.Unlock()
// Find a shared file, increase the reference count.
for _, g := range vfsShmFiles {
if g != nil && os.SameFile(fi, g.info) {
f.Close()
g.refs++
s.vfsShmFile = g
return nil
}
}
// Lock and truncate the file, if not readonly.
if s.readOnly {
err = _READONLY_CANTINIT
} else {
if rc := osWriteLock(f, 0, 0, 0); rc != _OK {
return rc
}
if err := f.Truncate(0); err != nil {
return _IOERR_SHMOPEN
}
}
// Add the new shared file.
s.vfsShmFile = &vfsShmFile{
File: f,
info: fi,
refs: 1,
}
f = nil
add := true
for i, g := range vfsShmFiles {
if g == nil {
@@ -148,17 +156,7 @@ func (s *vfsShm) shmOpen() error {
if add {
vfsShmFiles = append(vfsShmFiles, s.vfsShmFile)
}
if s.readOnly {
return _READONLY_CANTINIT
}
if rc := osWriteLock(f, _SHM_DMS, 1, 0); rc != _OK {
return rc
}
if err := f.Truncate(0); err != nil {
return _IOERR_SHMOPEN
}
return nil
return err
}
func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, extend bool) (uint32, error) {