mirror of
https://github.com/go-gitea/gitea
synced 2024-12-27 11:04:26 +00:00
94 lines
1.9 KiB
Go
94 lines
1.9 KiB
Go
// Copyright (C) 2018 Yasuhiro Matsumoto <mattn.jp@gmail.com>.
|
|
//
|
|
// Use of this source code is governed by an MIT-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// +build cgo
|
|
// +build sqlite_unlock_notify
|
|
|
|
package sqlite3
|
|
|
|
/*
|
|
#cgo CFLAGS: -DSQLITE_ENABLE_UNLOCK_NOTIFY
|
|
|
|
#include <stdlib.h>
|
|
#include <sqlite3-binding.h>
|
|
|
|
extern void unlock_notify_callback(void *arg, int argc);
|
|
*/
|
|
import "C"
|
|
import (
|
|
"fmt"
|
|
"math"
|
|
"sync"
|
|
"unsafe"
|
|
)
|
|
|
|
type unlock_notify_table struct {
|
|
sync.Mutex
|
|
seqnum uint
|
|
table map[uint]chan struct{}
|
|
}
|
|
|
|
var unt unlock_notify_table = unlock_notify_table{table: make(map[uint]chan struct{})}
|
|
|
|
func (t *unlock_notify_table) add(c chan struct{}) uint {
|
|
t.Lock()
|
|
defer t.Unlock()
|
|
h := t.seqnum
|
|
t.table[h] = c
|
|
t.seqnum++
|
|
return h
|
|
}
|
|
|
|
func (t *unlock_notify_table) remove(h uint) {
|
|
t.Lock()
|
|
defer t.Unlock()
|
|
delete(t.table, h)
|
|
}
|
|
|
|
func (t *unlock_notify_table) get(h uint) chan struct{} {
|
|
t.Lock()
|
|
defer t.Unlock()
|
|
c, ok := t.table[h]
|
|
if !ok {
|
|
panic(fmt.Sprintf("Non-existent key for unlcok-notify channel: %d", h))
|
|
}
|
|
return c
|
|
}
|
|
|
|
//export unlock_notify_callback
|
|
func unlock_notify_callback(argv unsafe.Pointer, argc C.int) {
|
|
for i := 0; i < int(argc); i++ {
|
|
parg := ((*(*[(math.MaxInt32 - 1) / unsafe.Sizeof((*C.uint)(nil))]*[1]uint)(argv))[i])
|
|
arg := *parg
|
|
h := arg[0]
|
|
c := unt.get(h)
|
|
c <- struct{}{}
|
|
}
|
|
}
|
|
|
|
//export unlock_notify_wait
|
|
func unlock_notify_wait(db *C.sqlite3) C.int {
|
|
// It has to be a bufferred channel to not block in sqlite_unlock_notify
|
|
// as sqlite_unlock_notify could invoke the callback before it returns.
|
|
c := make(chan struct{}, 1)
|
|
defer close(c)
|
|
|
|
h := unt.add(c)
|
|
defer unt.remove(h)
|
|
|
|
pargv := C.malloc(C.sizeof_uint)
|
|
defer C.free(pargv)
|
|
|
|
argv := (*[1]uint)(pargv)
|
|
argv[0] = h
|
|
if rv := C.sqlite3_unlock_notify(db, (*[0]byte)(C.unlock_notify_callback), unsafe.Pointer(pargv)); rv != C.SQLITE_OK {
|
|
return rv
|
|
}
|
|
|
|
<-c
|
|
|
|
return C.SQLITE_OK
|
|
}
|