| // Copyright 2017 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. |
| |
| #include <lib/trace-engine/instrumentation.h> |
| #include <lib/zx/clock.h> |
| |
| #include <atomic> |
| |
| namespace { |
| |
| std::atomic_uint64_t g_nonce{1u}; |
| |
| } // namespace |
| |
| __EXPORT uint64_t trace_generate_nonce() { |
| return g_nonce.fetch_add(1u, std::memory_order_relaxed); |
| } |
| |
| #if FUCHSIA_API_LEVEL_AT_LEAST(28) |
| __EXPORT uint64_t trace_time_based_id(zx_koid_t thread_id) { |
| uint64_t time = zx::clock::get_boot().get(); |
| uint64_t ts = time << 16; |
| uint64_t tid = (thread_id & ((1ULL << 9) - 1)) << 8; // only keep u8 |
| uint64_t nonce = trace_generate_nonce() & ((1ULL << 9) - 1); // only keep u8 |
| return ts | tid | nonce; |
| } |
| #endif |
