[chore]: Bump github.com/ncruces/go-sqlite3 from 0.18.3 to 0.18.4 (#3375)

Bumps [github.com/ncruces/go-sqlite3](https://github.com/ncruces/go-sqlite3) from 0.18.3 to 0.18.4.
- [Release notes](https://github.com/ncruces/go-sqlite3/releases)
- [Commits](https://github.com/ncruces/go-sqlite3/compare/v0.18.3...v0.18.4)

---
updated-dependencies:
- dependency-name: github.com/ncruces/go-sqlite3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -44,7 +44,7 @@ require (
 	github.com/miekg/dns v1.1.62
 	github.com/minio/minio-go/v7 v7.0.77
 	github.com/mitchellh/mapstructure v1.5.0
-	github.com/ncruces/go-sqlite3 v0.18.3
+	github.com/ncruces/go-sqlite3 v0.18.4
 	github.com/oklog/ulid v1.3.1
 	github.com/prometheus/client_golang v1.20.4
 	github.com/spf13/cobra v1.8.1

go.sum

@@ -434,8 +434,8 @@ github.com/moul/http2curl v1.0.0 h1:dRMWoAtb+ePxMlLkrCbAqh4TlPHXvoGUSQ323/9Zahs=
 github.com/moul/http2curl v1.0.0/go.mod h1:8UbvGypXm98wA/IqH45anm5Y2Z6ep6O31QGOAZ3H0fQ=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
-github.com/ncruces/go-sqlite3 v0.18.3 h1:tyMa75uh7LcINcfo0WrzOvcTkfz8Hqu0TEPX+KVyes4=
-github.com/ncruces/go-sqlite3 v0.18.3/go.mod h1:HAwOtA+cyEX3iN6YmkpQwfT4vMMgCB7rQRFUdOgEFik=
+github.com/ncruces/go-sqlite3 v0.18.4 h1:Je8o3y33MDwPYY/Cacas8yCsuoUzpNY/AgoSlN2ekyE=
+github.com/ncruces/go-sqlite3 v0.18.4/go.mod h1:4HLag13gq1k10s4dfGBhMfRVsssJRT9/5hYqVM9RUYo=
 github.com/ncruces/go-strftime v0.1.9 h1:bY0MQC28UADQmHmaF5dgpLmImcShSi2kHU9XLdhx/f4=
 github.com/ncruces/go-strftime v0.1.9/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
 github.com/ncruces/julianday v1.0.0 h1:fH0OKwa7NWvniGQtxdJRxAgkBMolni2BjDHaWTxqt7M=

vendor/github.com/ncruces/go-sqlite3/README.md

@@ -10,7 +10,7 @@ as well as direct access to most of the [C SQLite API](https://sqlite.org/cintro
 
 It wraps a [Wasm](https://webassembly.org/) [build](embed/) of SQLite,
 and uses [wazero](https://wazero.io/) as the runtime.\
-Go, wazero and [`x/sys`](https://pkg.go.dev/golang.org/x/sys) are the _only_ runtime dependencies [^1].
+Go, wazero and [`x/sys`](https://pkg.go.dev/golang.org/x/sys) are the _only_ runtime dependencies.
 
 ### Getting started
 
@@ -49,6 +49,8 @@ db.QueryRow(`SELECT sqlite_version()`).Scan(&version)
   simplifies [incremental BLOB I/O](https://sqlite.org/c3ref/blob_open.html).
 - [`github.com/ncruces/go-sqlite3/ext/bloom`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/bloom)
   provides a [Bloom filter](https://github.com/nalgeon/sqlean/issues/27#issuecomment-1002267134) virtual table.
+- [`github.com/ncruces/go-sqlite3/ext/closure`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/closure)
+  provides a transitive closure virtual table.
 - [`github.com/ncruces/go-sqlite3/ext/csv`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/csv)
   reads [comma-separated values](https://sqlite.org/csv.html).
 - [`github.com/ncruces/go-sqlite3/ext/fileio`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/fileio)
@@ -108,7 +110,7 @@ It also benefits greatly from [SQLite's](https://sqlite.org/testing.html) and
 [wazero's](https://tetrate.io/blog/introducing-wazero-from-tetrate/#:~:text=Rock%2Dsolid%20test%20approach) thorough testing.
 
 Every commit is [tested](https://github.com/ncruces/go-sqlite3/wiki/Test-matrix) on
-Linux (amd64/arm64/386/riscv64/s390x), macOS (amd64/arm64),
+Linux (amd64/arm64/386/riscv64/ppc64le/s390x), macOS (amd64/arm64),
 Windows (amd64), FreeBSD (amd64), OpenBSD (amd64), NetBSD (amd64),
 illumos (amd64), and Solaris (amd64).
 
@@ -128,7 +130,4 @@ The Wasm and VFS layers are also tested by running SQLite's
 - [`modernc.org/sqlite`](https://pkg.go.dev/modernc.org/sqlite)
 - [`crawshaw.io/sqlite`](https://pkg.go.dev/crawshaw.io/sqlite)
 - [`github.com/mattn/go-sqlite3`](https://pkg.go.dev/github.com/mattn/go-sqlite3)
-- [`github.com/zombiezen/go-sqlite`](https://pkg.go.dev/github.com/zombiezen/go-sqlite)
-
-[^1]: anything else you find in `go.mod` is either a test dependency,
-      or needed by one of the extensions.
+- [`github.com/zombiezen/go-sqlite`](https://pkg.go.dev/github.com/zombiezen/go-sqlite)

vendor/github.com/ncruces/go-sqlite3/config.go

@@ -302,7 +302,7 @@ func (c *Conn) SoftHeapLimit(n int64) int64 {
 	return int64(c.call("sqlite3_soft_heap_limit64", uint64(n)))
 }
 
-// SoftHeapLimit imposes a hard limit on heap size.
+// HardHeapLimit imposes a hard limit on heap size.
 //
 // https://sqlite.org/c3ref/hard_heap_limit64.html
 func (c *Conn) HardHeapLimit(n int64) int64 {

vendor/github.com/ncruces/go-sqlite3/driver/driver.go

@@ -578,8 +578,15 @@ type rows struct {
 	*stmt
 	names []string
 	types []string
+	nulls []bool
 }
 
+var (
+	// Ensure these interfaces are implemented:
+	_ driver.RowsColumnTypeDatabaseTypeName = &rows{}
+	_ driver.RowsColumnTypeNullable         = &rows{}
+)
+
 func (r *rows) Close() error {
 	r.Stmt.ClearBindings()
 	return r.Stmt.Reset()
@@ -596,6 +603,22 @@ func (r *rows) Columns() []string {
 	return r.names
 }
 
+func (r *rows) loadTypes() {
+	if r.nulls == nil {
+		count := r.Stmt.ColumnCount()
+		r.nulls = make([]bool, count)
+		r.types = make([]string, count)
+		for i := range r.nulls {
+			if col := r.Stmt.ColumnOriginName(i); col != "" {
+				r.types[i], _, r.nulls[i], _, _, _ = r.Stmt.Conn().TableColumnMetadata(
+					r.Stmt.ColumnDatabaseName(i),
+					r.Stmt.ColumnTableName(i),
+					col)
+			}
+		}
+	}
+}
+
 func (r *rows) declType(index int) string {
 	if r.types == nil {
 		count := r.Stmt.ColumnCount()
@@ -608,7 +631,8 @@ func (r *rows) declType(index int) string {
 }
 
 func (r *rows) ColumnTypeDatabaseTypeName(index int) string {
-	decltype := r.declType(index)
+	r.loadTypes()
+	decltype := r.types[index]
 	if len := len(decltype); len > 0 && decltype[len-1] == ')' {
 		if i := strings.LastIndexByte(decltype, '('); i >= 0 {
 			decltype = decltype[:i]
@@ -617,6 +641,14 @@ func (r *rows) ColumnTypeDatabaseTypeName(index int) string {
 	return strings.TrimSpace(decltype)
 }
 
+func (r *rows) ColumnTypeNullable(index int) (nullable, ok bool) {
+	r.loadTypes()
+	if r.nulls[index] {
+		return false, true
+	}
+	return true, false
+}
+
 func (r *rows) Next(dest []driver.Value) error {
 	old := r.Stmt.Conn().SetInterrupt(r.ctx)
 	defer r.Stmt.Conn().SetInterrupt(old)

vendor/github.com/ncruces/go-sqlite3/internal/alloc/alloc_slice.go

@@ -1,4 +1,4 @@
-//go:build !(darwin || linux) || !(amd64 || arm64 || riscv64) || sqlite3_noshm || sqlite3_nosys
+//go:build !(darwin || linux) || !(amd64 || arm64 || riscv64 || ppc64le) || sqlite3_noshm || sqlite3_nosys
 
 package alloc
 

vendor/github.com/ncruces/go-sqlite3/internal/util/mmap.go

@@ -1,4 +1,4 @@
-//go:build unix && (amd64 || arm64 || riscv64) && !(sqlite3_noshm || sqlite3_nosys)
+//go:build unix && (amd64 || arm64 || riscv64 || ppc64le) && !(sqlite3_noshm || sqlite3_nosys)
 
 package util
 

vendor/github.com/ncruces/go-sqlite3/internal/util/mmap_other.go

@@ -1,4 +1,4 @@
-//go:build !unix || !(amd64 || arm64 || riscv64) || sqlite3_noshm || sqlite3_nosys
+//go:build !unix || !(amd64 || arm64 || riscv64 || ppc64le) || sqlite3_noshm || sqlite3_nosys
 
 package util
 

vendor/github.com/ncruces/go-sqlite3/internal/util/set.go

@@ -0,0 +1,12 @@
+package util
+
+type Set[E comparable] map[E]struct{}
+
+func (s Set[E]) Add(v E) {
+	s[v] = struct{}{}
+}
+
+func (s Set[E]) Contains(v E) bool {
+	_, ok := s[v]
+	return ok
+}

vendor/github.com/ncruces/go-sqlite3/vfs/README.md

@@ -46,7 +46,7 @@ to check if your build supports file locking.
 
 ### Write-Ahead Logging
 
-On 64-bit Unix, this module uses `mmap` to implement
+On 64-bit little-endian Unix, this module uses `mmap` to implement
 [shared-memory for the WAL-index](https://sqlite.org/wal.html#implementation_of_shared_memory_for_the_wal_index),
 like SQLite.
 

vendor/github.com/ncruces/go-sqlite3/vfs/lock.go

@@ -75,19 +75,7 @@ func (f *vfsFile) Lock(lock LockLevel) error {
 		if f.lock <= LOCK_NONE || f.lock >= LOCK_EXCLUSIVE {
 			panic(util.AssertErr())
 		}
-		reserved := f.lock == LOCK_RESERVED
-		// A PENDING lock is needed before acquiring an EXCLUSIVE lock.
-		if f.lock < LOCK_PENDING {
-			// If we're already RESERVED, we can block indefinitely,
-			// since only incoming readers may briefly hold the PENDING lock.
-			if rc := osGetPendingLock(f.File, reserved /* block */); rc != _OK {
-				return rc
-			}
-			f.lock = LOCK_PENDING
-		}
-		// We are now PENDING, so we're just waiting for readers to leave.
-		// If we were RESERVED, we can block for a bit before invoking the busy handler.
-		if rc := osGetExclusiveLock(f.File, reserved /* block */); rc != _OK {
+		if rc := osGetExclusiveLock(f.File, &f.lock); rc != _OK {
 			return rc
 		}
 		f.lock = LOCK_EXCLUSIVE

vendor/github.com/ncruces/go-sqlite3/vfs/os_bsd.go

@@ -4,31 +4,15 @@
 
 import (
 	"os"
-	"time"
 
 	"golang.org/x/sys/unix"
 )
 
-func osUnlock(file *os.File, start, len int64) _ErrorCode {
-	if start == 0 && len == 0 {
-		err := unix.Flock(int(file.Fd()), unix.LOCK_UN)
-		if err != nil {
-			return _IOERR_UNLOCK
-		}
-	}
-	return _OK
-}
-
-func osLock(file *os.File, how int, def _ErrorCode) _ErrorCode {
-	err := unix.Flock(int(file.Fd()), how)
-	return osLockErrorCode(err, def)
-}
-
-func osReadLock(file *os.File, _ /*start*/, _ /*len*/ int64, _ /*timeout*/ time.Duration) _ErrorCode {
+func osGetSharedLock(file *os.File) _ErrorCode {
 	return osLock(file, unix.LOCK_SH|unix.LOCK_NB, _IOERR_RDLOCK)
 }
 
-func osWriteLock(file *os.File, _ /*start*/, _ /*len*/ int64, _ /*timeout*/ time.Duration) _ErrorCode {
+func osGetReservedLock(file *os.File) _ErrorCode {
 	rc := osLock(file, unix.LOCK_EX|unix.LOCK_NB, _IOERR_LOCK)
 	if rc == _BUSY {
 		// The documentation states the lock is upgraded by releasing the previous lock,
@@ -38,3 +22,40 @@ func osWriteLock(file *os.File, _ /*start*/, _ /*len*/ int64, _ /*timeout*/ time
 	}
 	return rc
 }
+
+func osGetExclusiveLock(file *os.File, state *LockLevel) _ErrorCode {
+	if *state >= LOCK_RESERVED {
+		return _OK
+	}
+	return osGetReservedLock(file)
+}
+
+func osDowngradeLock(file *os.File, _ LockLevel) _ErrorCode {
+	rc := osLock(file, unix.LOCK_SH|unix.LOCK_NB, _IOERR_RDLOCK)
+	if rc == _BUSY {
+		// The documentation states the lock is upgraded by releasing the previous lock,
+		// then acquiring the new lock.
+		// This is a race, so return IOERR_RDLOCK to ensure the transaction is aborted.
+		return _IOERR_RDLOCK
+	}
+	return _OK
+}
+
+func osReleaseLock(file *os.File, _ LockLevel) _ErrorCode {
+	err := unix.Flock(int(file.Fd()), unix.LOCK_UN)
+	if err != nil {
+		return _IOERR_UNLOCK
+	}
+	return _OK
+}
+
+func osCheckReservedLock(file *os.File) (bool, _ErrorCode) {
+	// Test the RESERVED lock.
+	lock, rc := osTestLock(file, _RESERVED_BYTE, 1)
+	return lock == unix.F_WRLCK, rc
+}
+
+func osLock(file *os.File, how int, def _ErrorCode) _ErrorCode {
+	err := unix.Flock(int(file.Fd()), how)
+	return osLockErrorCode(err, def)
+}

vendor/github.com/ncruces/go-sqlite3/vfs/os_f2fs_linux.go

@@ -1,4 +1,4 @@
-//go:build (amd64 || arm64 || riscv64) && !sqlite3_nosys
+//go:build (amd64 || arm64 || riscv64 || ppc64le) && !sqlite3_nosys
 
 package vfs
 
@@ -9,6 +9,7 @@
 )
 
 const (
+	// https://godbolt.org/z/1PcK5vea3
 	_F2FS_IOC_START_ATOMIC_WRITE  = 62721
 	_F2FS_IOC_COMMIT_ATOMIC_WRITE = 62722
 	_F2FS_IOC_ABORT_ATOMIC_WRITE  = 62725

vendor/github.com/ncruces/go-sqlite3/vfs/os_ofd.go

@@ -0,0 +1,59 @@
+//go:build (linux || darwin) && !(sqlite3_flock || sqlite3_nosys)
+
+package vfs
+
+import (
+	"os"
+	"time"
+
+	"golang.org/x/sys/unix"
+)
+
+func osGetSharedLock(file *os.File) _ErrorCode {
+	// Test the PENDING lock before acquiring a new SHARED lock.
+	if lock, _ := osTestLock(file, _PENDING_BYTE, 1); lock == unix.F_WRLCK {
+		return _BUSY
+	}
+	// Acquire the SHARED lock.
+	return osReadLock(file, _SHARED_FIRST, _SHARED_SIZE, 0)
+}
+
+func osGetReservedLock(file *os.File) _ErrorCode {
+	// Acquire the RESERVED lock.
+	return osWriteLock(file, _RESERVED_BYTE, 1, 0)
+}
+
+func osGetExclusiveLock(file *os.File, state *LockLevel) _ErrorCode {
+	if *state == LOCK_RESERVED {
+		// A PENDING lock is needed before acquiring an EXCLUSIVE lock.
+		if rc := osWriteLock(file, _PENDING_BYTE, 1, -1); rc != _OK {
+			return rc
+		}
+		*state = LOCK_PENDING
+	}
+	// Acquire the EXCLUSIVE lock.
+	return osWriteLock(file, _SHARED_FIRST, _SHARED_SIZE, time.Millisecond)
+}
+
+func osDowngradeLock(file *os.File, state LockLevel) _ErrorCode {
+	if state >= LOCK_EXCLUSIVE {
+		// Downgrade to a SHARED lock.
+		if rc := osReadLock(file, _SHARED_FIRST, _SHARED_SIZE, 0); rc != _OK {
+			// notest // this should never happen
+			return _IOERR_RDLOCK
+		}
+	}
+	// Release the PENDING and RESERVED locks.
+	return osUnlock(file, _PENDING_BYTE, 2)
+}
+
+func osReleaseLock(file *os.File, _ LockLevel) _ErrorCode {
+	// Release all locks.
+	return osUnlock(file, 0, 0)
+}
+
+func osCheckReservedLock(file *os.File) (bool, _ErrorCode) {
+	// Test the RESERVED lock.
+	lock, rc := osTestLock(file, _RESERVED_BYTE, 1)
+	return lock == unix.F_WRLCK, rc
+}

vendor/github.com/ncruces/go-sqlite3/vfs/os_std_atomic.go

@@ -1,4 +1,4 @@
-//go:build !linux || !(amd64 || arm64 || riscv64) || sqlite3_nosys
+//go:build !linux || !(amd64 || arm64 || riscv64 || ppc64le) || sqlite3_nosys
 
 package vfs
 

vendor/github.com/ncruces/go-sqlite3/vfs/os_unix.go

@@ -31,3 +31,41 @@ func osSetMode(file *os.File, modeof string) error {
 	}
 	return nil
 }
+
+func osTestLock(file *os.File, start, len int64) (int16, _ErrorCode) {
+	lock := unix.Flock_t{
+		Type:  unix.F_WRLCK,
+		Start: start,
+		Len:   len,
+	}
+	if unix.FcntlFlock(file.Fd(), unix.F_GETLK, &lock) != nil {
+		return 0, _IOERR_CHECKRESERVEDLOCK
+	}
+	return lock.Type, _OK
+}
+
+func osLockErrorCode(err error, def _ErrorCode) _ErrorCode {
+	if err == nil {
+		return _OK
+	}
+	if errno, ok := err.(unix.Errno); ok {
+		switch errno {
+		case
+			unix.EACCES,
+			unix.EAGAIN,
+			unix.EBUSY,
+			unix.EINTR,
+			unix.ENOLCK,
+			unix.EDEADLK,
+			unix.ETIMEDOUT:
+			return _BUSY
+		case unix.EPERM:
+			return _PERM
+		}
+		// notest // usually EWOULDBLOCK == EAGAIN
+		if errno == unix.EWOULDBLOCK && unix.EWOULDBLOCK != unix.EAGAIN {
+			return _BUSY
+		}
+	}
+	return def
+}

vendor/github.com/ncruces/go-sqlite3/vfs/os_unix_lock.go

@@ -1,108 +0,0 @@
-//go:build (linux || darwin || freebsd || openbsd || netbsd || dragonfly || illumos || sqlite3_flock) && !sqlite3_nosys
-
-package vfs
-
-import (
-	"os"
-	"time"
-
-	"golang.org/x/sys/unix"
-)
-
-func osGetSharedLock(file *os.File) _ErrorCode {
-	// Test the PENDING lock before acquiring a new SHARED lock.
-	if lock, _ := osGetLock(file, _PENDING_BYTE, 1); lock == unix.F_WRLCK {
-		return _BUSY
-	}
-	// Acquire the SHARED lock.
-	return osReadLock(file, _SHARED_FIRST, _SHARED_SIZE, 0)
-}
-
-func osGetReservedLock(file *os.File) _ErrorCode {
-	// Acquire the RESERVED lock.
-	return osWriteLock(file, _RESERVED_BYTE, 1, 0)
-}
-
-func osGetPendingLock(file *os.File, block bool) _ErrorCode {
-	var timeout time.Duration
-	if block {
-		timeout = -1
-	}
-	// Acquire the PENDING lock.
-	return osWriteLock(file, _PENDING_BYTE, 1, timeout)
-}
-
-func osGetExclusiveLock(file *os.File, block bool) _ErrorCode {
-	var timeout time.Duration
-	if block {
-		timeout = time.Millisecond
-	}
-	// Acquire the EXCLUSIVE lock.
-	return osWriteLock(file, _SHARED_FIRST, _SHARED_SIZE, timeout)
-}
-
-func osDowngradeLock(file *os.File, state LockLevel) _ErrorCode {
-	if state >= LOCK_EXCLUSIVE {
-		// Downgrade to a SHARED lock.
-		if rc := osReadLock(file, _SHARED_FIRST, _SHARED_SIZE, 0); rc != _OK {
-			// In theory, the downgrade to a SHARED cannot fail because another
-			// process is holding an incompatible lock. If it does, this
-			// indicates that the other process is not following the locking
-			// protocol. If this happens, return IOERR_RDLOCK. Returning
-			// BUSY would confuse the upper layer.
-			// notest
-			return _IOERR_RDLOCK
-		}
-	}
-	// Release the PENDING and RESERVED locks.
-	return osUnlock(file, _PENDING_BYTE, 2)
-}
-
-func osReleaseLock(file *os.File, _ LockLevel) _ErrorCode {
-	// Release all locks.
-	return osUnlock(file, 0, 0)
-}
-
-func osCheckReservedLock(file *os.File) (bool, _ErrorCode) {
-	// Test the RESERVED lock.
-	lock, rc := osGetLock(file, _RESERVED_BYTE, 1)
-	return lock == unix.F_WRLCK, rc
-}
-
-func osGetLock(file *os.File, start, len int64) (int16, _ErrorCode) {
-	lock := unix.Flock_t{
-		Type:  unix.F_WRLCK,
-		Start: start,
-		Len:   len,
-	}
-	if unix.FcntlFlock(file.Fd(), unix.F_GETLK, &lock) != nil {
-		return 0, _IOERR_CHECKRESERVEDLOCK
-	}
-	return lock.Type, _OK
-}
-
-func osLockErrorCode(err error, def _ErrorCode) _ErrorCode {
-	if err == nil {
-		return _OK
-	}
-	if errno, ok := err.(unix.Errno); ok {
-		switch errno {
-		case
-			unix.EACCES,
-			unix.EAGAIN,
-			unix.EBUSY,
-			unix.EINTR,
-			unix.ENOLCK,
-			unix.EDEADLK,
-			unix.ETIMEDOUT:
-			return _BUSY
-		case unix.EPERM:
-			return _PERM
-		}
-		// notest // usually EWOULDBLOCK == EAGAIN
-		if errno == unix.EWOULDBLOCK && unix.EWOULDBLOCK != unix.EAGAIN {
-			return _BUSY
-		}
-	}
-	return def
-}

vendor/github.com/ncruces/go-sqlite3/vfs/os_windows.go

@@ -28,27 +28,25 @@ func osGetReservedLock(file *os.File) _ErrorCode {
 	return osWriteLock(file, _RESERVED_BYTE, 1, 0)
 }
 
-func osGetPendingLock(file *os.File, block bool) _ErrorCode {
-	var timeout time.Duration
-	if block {
-		timeout = -1
-	}
-
-	// Acquire the PENDING lock.
-	return osWriteLock(file, _PENDING_BYTE, 1, timeout)
-}
-
-func osGetExclusiveLock(file *os.File, block bool) _ErrorCode {
-	var timeout time.Duration
-	if block {
-		timeout = time.Millisecond
+func osGetExclusiveLock(file *os.File, state *LockLevel) _ErrorCode {
+	// A PENDING lock is needed before releasing the SHARED lock.
+	if *state < LOCK_PENDING {
+		// If we were RESERVED, we can block indefinitely.
+		var timeout time.Duration
+		if *state == LOCK_RESERVED {
+			timeout = -1
+		}
+		if rc := osWriteLock(file, _PENDING_BYTE, 1, timeout); rc != _OK {
+			return rc
+		}
+		*state = LOCK_PENDING
 	}
 
 	// Release the SHARED lock.
 	osUnlock(file, _SHARED_FIRST, _SHARED_SIZE)
 
 	// Acquire the EXCLUSIVE lock.
-	rc := osWriteLock(file, _SHARED_FIRST, _SHARED_SIZE, timeout)
+	rc := osWriteLock(file, _SHARED_FIRST, _SHARED_SIZE, time.Millisecond)
 
 	if rc != _OK {
 		// Reacquire the SHARED lock.
@@ -64,9 +62,7 @@ func osDowngradeLock(file *os.File, state LockLevel) _ErrorCode {
 
 		// Reacquire the SHARED lock.
 		if rc := osReadLock(file, _SHARED_FIRST, _SHARED_SIZE, 0); rc != _OK {
-			// This should never happen.
-			// We should always be able to reacquire the read lock.
-			// notest
+			// notest // this should never happen
 			return _IOERR_RDLOCK
 		}
 	}

vendor/github.com/ncruces/go-sqlite3/vfs/shm.go

@@ -1,4 +1,4 @@
-//go:build (darwin || linux) && (amd64 || arm64 || riscv64) && !(sqlite3_flock || sqlite3_noshm || sqlite3_nosys)
+//go:build (darwin || linux) && (amd64 || arm64 || riscv64 || ppc64le) && !(sqlite3_flock || sqlite3_noshm || sqlite3_nosys)
 
 package vfs
 
@@ -70,7 +70,7 @@ func (s *vfsShm) shmOpen() _ErrorCode {
 	}
 
 	// Dead man's switch.
-	if lock, rc := osGetLock(s.File, _SHM_DMS, 1); rc != _OK {
+	if lock, rc := osTestLock(s.File, _SHM_DMS, 1); rc != _OK {
 		return _IOERR_LOCK
 	} else if lock == unix.F_WRLCK {
 		return _BUSY

vendor/github.com/ncruces/go-sqlite3/vfs/shm_bsd.go

@@ -1,4 +1,4 @@
-//go:build (freebsd || openbsd || netbsd || dragonfly || illumos || sqlite3_flock) && (amd64 || arm64 || riscv64) && !(sqlite3_noshm || sqlite3_nosys)
+//go:build (freebsd || openbsd || netbsd || dragonfly || illumos || sqlite3_flock) && (amd64 || arm64 || riscv64 || ppc64le) && !(sqlite3_noshm || sqlite3_nosys)
 
 package vfs
 

vendor/github.com/ncruces/go-sqlite3/vfs/shm_other.go

@@ -1,4 +1,4 @@
-//go:build !(darwin || linux || freebsd || openbsd || netbsd || dragonfly || illumos || sqlite3_flock) || !(amd64 || arm64 || riscv64) || sqlite3_noshm || sqlite3_nosys
+//go:build !(darwin || linux || freebsd || openbsd || netbsd || dragonfly || illumos || sqlite3_flock) || !(amd64 || arm64 || riscv64 || ppc64le) || sqlite3_noshm || sqlite3_nosys
 
 package vfs
 

vendor/modules.txt

@@ -517,7 +517,7 @@ github.com/modern-go/reflect2
 # github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822
 ## explicit
 github.com/munnerz/goautoneg
-# github.com/ncruces/go-sqlite3 v0.18.3
+# github.com/ncruces/go-sqlite3 v0.18.4
 ## explicit; go 1.21
 github.com/ncruces/go-sqlite3
 github.com/ncruces/go-sqlite3/driver