diff options
Diffstat (limited to 'vendor/github.com/etcd-io/bbolt/bolt_windows.go')
-rw-r--r-- | vendor/github.com/etcd-io/bbolt/bolt_windows.go | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/vendor/github.com/etcd-io/bbolt/bolt_windows.go b/vendor/github.com/etcd-io/bbolt/bolt_windows.go deleted file mode 100644 index fca178bd2..000000000 --- a/vendor/github.com/etcd-io/bbolt/bolt_windows.go +++ /dev/null @@ -1,141 +0,0 @@ -package bbolt - -import ( - "fmt" - "os" - "syscall" - "time" - "unsafe" -) - -// LockFileEx code derived from golang build filemutex_windows.go @ v1.5.1 -var ( - modkernel32 = syscall.NewLazyDLL("kernel32.dll") - procLockFileEx = modkernel32.NewProc("LockFileEx") - procUnlockFileEx = modkernel32.NewProc("UnlockFileEx") -) - -const ( - // see https://msdn.microsoft.com/en-us/library/windows/desktop/aa365203(v=vs.85).aspx - flagLockExclusive = 2 - flagLockFailImmediately = 1 - - // see https://msdn.microsoft.com/en-us/library/windows/desktop/ms681382(v=vs.85).aspx - errLockViolation syscall.Errno = 0x21 -) - -func lockFileEx(h syscall.Handle, flags, reserved, locklow, lockhigh uint32, ol *syscall.Overlapped) (err error) { - r, _, err := procLockFileEx.Call(uintptr(h), uintptr(flags), uintptr(reserved), uintptr(locklow), uintptr(lockhigh), uintptr(unsafe.Pointer(ol))) - if r == 0 { - return err - } - return nil -} - -func unlockFileEx(h syscall.Handle, reserved, locklow, lockhigh uint32, ol *syscall.Overlapped) (err error) { - r, _, err := procUnlockFileEx.Call(uintptr(h), uintptr(reserved), uintptr(locklow), uintptr(lockhigh), uintptr(unsafe.Pointer(ol)), 0) - if r == 0 { - return err - } - return nil -} - -// fdatasync flushes written data to a file descriptor. -func fdatasync(db *DB) error { - return db.file.Sync() -} - -// flock acquires an advisory lock on a file descriptor. -func flock(db *DB, exclusive bool, timeout time.Duration) error { - var t time.Time - if timeout != 0 { - t = time.Now() - } - var flag uint32 = flagLockFailImmediately - if exclusive { - flag |= flagLockExclusive - } - for { - // Fix for https://github.com/etcd-io/bbolt/issues/121. Use byte-range - // -1..0 as the lock on the database file. - var m1 uint32 = (1 << 32) - 1 // -1 in a uint32 - err := lockFileEx(syscall.Handle(db.file.Fd()), flag, 0, 1, 0, &syscall.Overlapped{ - Offset: m1, - OffsetHigh: m1, - }) - - if err == nil { - return nil - } else if err != errLockViolation { - return err - } - - // If we timed oumercit then return an error. - if timeout != 0 && time.Since(t) > timeout-flockRetryTimeout { - return ErrTimeout - } - - // Wait for a bit and try again. - time.Sleep(flockRetryTimeout) - } -} - -// funlock releases an advisory lock on a file descriptor. -func funlock(db *DB) error { - var m1 uint32 = (1 << 32) - 1 // -1 in a uint32 - err := unlockFileEx(syscall.Handle(db.file.Fd()), 0, 1, 0, &syscall.Overlapped{ - Offset: m1, - OffsetHigh: m1, - }) - return err -} - -// mmap memory maps a DB's data file. -// Based on: https://github.com/edsrzf/mmap-go -func mmap(db *DB, sz int) error { - if !db.readOnly { - // Truncate the database to the size of the mmap. - if err := db.file.Truncate(int64(sz)); err != nil { - return fmt.Errorf("truncate: %s", err) - } - } - - // Open a file mapping handle. - sizelo := uint32(sz >> 32) - sizehi := uint32(sz) & 0xffffffff - h, errno := syscall.CreateFileMapping(syscall.Handle(db.file.Fd()), nil, syscall.PAGE_READONLY, sizelo, sizehi, nil) - if h == 0 { - return os.NewSyscallError("CreateFileMapping", errno) - } - - // Create the memory map. - addr, errno := syscall.MapViewOfFile(h, syscall.FILE_MAP_READ, 0, 0, uintptr(sz)) - if addr == 0 { - return os.NewSyscallError("MapViewOfFile", errno) - } - - // Close mapping handle. - if err := syscall.CloseHandle(syscall.Handle(h)); err != nil { - return os.NewSyscallError("CloseHandle", err) - } - - // Convert to a byte array. - db.data = ((*[maxMapSize]byte)(unsafe.Pointer(addr))) - db.datasz = sz - - return nil -} - -// munmap unmaps a pointer from a file. -// Based on: https://github.com/edsrzf/mmap-go -func munmap(db *DB) error { - if db.data == nil { - return nil - } - - addr := (uintptr)(unsafe.Pointer(&db.data[0])) - if err := syscall.UnmapViewOfFile(addr); err != nil { - return os.NewSyscallError("UnmapViewOfFile", err) - } - return nil -} |