Regular Reads will block until data is available, but not wait for a full buffer. 
Writes will block until there is space available and writes bigger than the buffer will wait for reads to make space.

`TryRead` and `TryWrite` are still available for non-blocking reads and writes.

  const Tensor& value = context->input(1);
  // Note: every resource-variable-manipulating op assumes copy-on-write
  // semantics, and creates a copy of the variable's Tensor if its refcount is
  // bigger than 1 when we try to modify it. This means we never need to copy
  // the original tensor for AssignVariableOp; even if there are other live
  // users of it we know none can modify it so this is always safe (even in

	case "P-384":
		return 2, 48, true
	case "P-521":
		return 3, 80, true
	}
	return 0, 0, false // A mismatch
}

func hashToBytes(dst, hash []byte, c elliptic.Curve) {
	l := len(dst)
	if n := c.Params().N.BitLen(); n == l*8 {
		// allocation free path for curves with a length that is a whole number of bytes
		if len(hash) >= l {
			// truncate hash
			copy(dst, hash[:l])
			return
		}
		// pad hash with leading zeros

And your **FastAPI** application might also be composed of several files/modules, etc.

### **FastAPI** app file

Let's say you have a file structure as described in [Bigger Applications](bigger-applications.md){.internal-link target=_blank}:

```
.
├── app
│   ├── __init__.py
│   └── main.py
```

In the file `main.py` you have your **FastAPI** app:


```Python

	if t := reflect.TypeOf(privKey); t != reflect.TypeOf(&rsa.PrivateKey{}) {
		return 0, fmt.Errorf("key type is not RSA: %v", t)
	}
	pkey := privKey.(*rsa.PrivateKey)
	return pkey.N.BitLen(), nil
}

// GetEllipticCurve returns the type of curve associated with the private key;
// if ECDSA is used, then only 384 and 256 (default) are returned; if non-ECDSA
// is used then an error is returned

And the `items_per_user` would keep its default value of `50`.

## Settings in another module

You could put those settings in another module file as you saw in [Bigger Applications - Multiple Files](../tutorial/bigger-applications.md){.internal-link target=_blank}.

For example, you could have a file `config.py` with:

```Python
{!../../../docs_src/settings/app01/config.py!}
```

		// conservative - everything might be a pointer
		for off := child.argoff; off < child.argoff+child.arglen; off += goarch.PtrSize {
			dumpint(fieldKindPtr)
			dumpint(uint64(off))
		}
	}

	// Dump fields in the local vars section
	if stkmap == nil {
		// No locals information, dump everything.
		for off := child.arglen; off < s.varp-s.sp; off += goarch.PtrSize {
			dumpint(fieldKindPtr)
			dumpint(uint64(off))
		}

type lookupflags = uint32
type oflags = uint32
type rights = uint64
type timestamp = uint64
type dircookie = uint64
type filedelta = int64
type fstflags = uint32

type iovec struct {
	buf    uintptr32
	bufLen size
}

const (
	LOOKUP_SYMLINK_FOLLOW = 0x00000001
)

const (
	OFLAG_CREATE    = 0x0001
	OFLAG_DIRECTORY = 0x0002
	OFLAG_EXCL      = 0x0004
	OFLAG_TRUNC     = 0x0008
)

const (

// and don't use hardware acceleration.
//
// The simple (and slow) CRC32 implementation only uses a 256*4 bytes table.
//
// The slicing-by-8 algorithm is a faster implementation that uses a bigger
// table (8*256*4 bytes).

package crc32

import "internal/byteorder"

// simpleMakeTable allocates and constructs a Table for the specified
// polynomial. The table is suitable for use with the simple algorithm

//sys	FlushFileBuffers(handle Handle) (err error)
//sys	GetFullPathName(path *uint16, buflen uint32, buf *uint16, fname **uint16) (n uint32, err error) = kernel32.GetFullPathNameW
//sys	GetLongPathName(path *uint16, buf *uint16, buflen uint32) (n uint32, err error) = kernel32.GetLongPathNameW
//sys	GetShortPathName(longpath *uint16, shortpath *uint16, buflen uint32) (n uint32, err error) = kernel32.GetShortPathNameW