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add _mutex flag to specify SQLITE_OPEN_NOMUTEX or SQLITE_OPEN_FULLMUTEX #540

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Merged
merged 1 commit into from
Apr 19, 2018
Merged

add _mutex flag to specify SQLITE_OPEN_NOMUTEX or SQLITE_OPEN_FULLMUTEX #540

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19 changes: 16 additions & 3 deletions sqlite3.go
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Original file line number Diff line number Diff line change
Expand Up @@ -783,6 +783,8 @@ func errorString(err Error) string {
// Enable or disable enforcement of foreign keys. X can be 1 or 0.
// _recursive_triggers=X
// Enable or disable recursive triggers. X can be 1 or 0.
// _mutex=XXX
// Specify mutex mode. XXX can be "no", "full".
func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
if C.sqlite3_threadsafe() == 0 {
return nil, errors.New("sqlite library was not compiled for thread-safe operation")
Expand All @@ -793,6 +795,7 @@ func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
busyTimeout := 5000
foreignKeys := -1
recursiveTriggers := -1
mutex := C.int(C.SQLITE_OPEN_FULLMUTEX)
pos := strings.IndexRune(dsn, '?')
if pos >= 1 {
params, err := url.ParseQuery(dsn[pos+1:])
Expand Down Expand Up @@ -859,6 +862,18 @@ func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
}
}

// _mutex
if val := params.Get("_mutex"); val != "" {
switch val {
case "no":
mutex = C.SQLITE_OPEN_NOMUTEX
case "full":
mutex = C.SQLITE_OPEN_FULLMUTEX
default:
return nil, fmt.Errorf("Invalid _mutex: %v", val)
}
}

if !strings.HasPrefix(dsn, "file:") {
dsn = dsn[:pos]
}
Expand All @@ -868,9 +883,7 @@ func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
name := C.CString(dsn)
defer C.free(unsafe.Pointer(name))
rv := C._sqlite3_open_v2(name, &db,
C.SQLITE_OPEN_FULLMUTEX|
C.SQLITE_OPEN_READWRITE|
C.SQLITE_OPEN_CREATE,
mutex|C.SQLITE_OPEN_READWRITE|C.SQLITE_OPEN_CREATE,
nil)
if rv != 0 {
return nil, Error{Code: ErrNo(rv)}
Expand Down