| // Copyright 2018 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef LIB_FZL_MEMORY_PROBE_H_ |
| #define LIB_FZL_MEMORY_PROBE_H_ |
| |
| #include <zircon/compiler.h> |
| |
| __BEGIN_CDECLS |
| |
| // Returns true if the byte at the given address can be read or written. |
| // |
| // These functions are designed for testing purposes. They are very heavyweight since they spin up a |
| // thread to attempt the memory access. |
| // |
| // If there is a failure creating a thread, the return value will be false. |
| // |
| // The write probe is implemented as a non-atomic read/write of the same value. If the address could |
| // be modified by a different thread, or if it falls in the region of the stack used by the |
| // implementation of probe_for_write itself (since the probe is asynchronous), the non-atomic |
| // read/write can corrupt the data. |
| bool probe_for_read(const void* addr); |
| bool probe_for_write(void* addr); |
| |
| __END_CDECLS |
| |
| #endif // LIB_FZL_MEMORY_PROBE_H_ |
