src/internal/lifecycle_context.cpp
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|---|---|---|---|
| 1 | #include "lifecycle_context.hpp" | ||
| 2 | |||
| 3 | #include "platform.hpp" | ||
| 4 | |||
| 5 | namespace DetourModKit | ||
| 6 | { | ||
| 7 | namespace detail | ||
| 8 | { | ||
| 9 | namespace | ||
| 10 | { | ||
| 11 | // Constant initialization avoids a dynamic-initialization-order dependency between translation units. | ||
| 12 | constinit LifecycleContext s_lifecycle; | ||
| 13 | } // namespace | ||
| 14 | |||
| 15 | #if defined(DMK_ENABLE_TEST_SEAMS) | ||
| 16 | bool (*g_loader_lock_override)() noexcept = nullptr; | ||
| 17 | #endif | ||
| 18 | |||
| 19 | 3035822 | LifecycleContext &lifecycle() noexcept | |
| 20 | { | ||
| 21 | 3035822 | return s_lifecycle; | |
| 22 | } | ||
| 23 | |||
| 24 | 203 | bool LifecycleContext::begin_start() noexcept | |
| 25 | { | ||
| 26 | 203 | LifecycleState expected = LifecycleState::Stopped; | |
| 27 |
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203 | if (!m_state.compare_exchange_strong(expected, LifecycleState::Starting, std::memory_order_acq_rel)) |
| 28 | { | ||
| 29 | 2 | return false; | |
| 30 | } | ||
| 31 | // Publish the new generation and neutral loader context before mark_running() releases the admitted | ||
| 32 | // session. | ||
| 33 | 201 | m_generation.fetch_add(1, std::memory_order_acq_rel); | |
| 34 | 201 | m_loader_context.store(LoaderContext::Normal, std::memory_order_release); | |
| 35 | 201 | return true; | |
| 36 | } | ||
| 37 | |||
| 38 | 189 | void LifecycleContext::mark_running() noexcept | |
| 39 | { | ||
| 40 | 189 | m_state.store(LifecycleState::Running, std::memory_order_release); | |
| 41 | 189 | } | |
| 42 | |||
| 43 | 184 | void LifecycleContext::begin_stop() noexcept | |
| 44 | { | ||
| 45 | 184 | m_state.store(LifecycleState::Stopping, std::memory_order_release); | |
| 46 | 184 | } | |
| 47 | |||
| 48 | 198 | void LifecycleContext::mark_stopped() noexcept | |
| 49 | { | ||
| 50 | 198 | m_state.store(LifecycleState::Stopped, std::memory_order_release); | |
| 51 | 198 | } | |
| 52 | |||
| 53 | 51 | void LifecycleContext::publish_worker_thread() noexcept | |
| 54 | { | ||
| 55 | 51 | m_worker_thread_id.store(static_cast<std::uint32_t>(GetCurrentThreadId()), std::memory_order_release); | |
| 56 | 51 | } | |
| 57 | |||
| 58 | 95 | void LifecycleContext::clear_worker_thread() noexcept | |
| 59 | { | ||
| 60 | 95 | m_worker_thread_id.store(0, std::memory_order_release); | |
| 61 | 95 | } | |
| 62 | |||
| 63 | 76 | bool LifecycleContext::is_worker_thread() const noexcept | |
| 64 | { | ||
| 65 | 76 | const std::uint32_t worker = worker_thread_id(); | |
| 66 |
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76 | return worker != 0 && worker == static_cast<std::uint32_t>(GetCurrentThreadId()); |
| 67 | } | ||
| 68 | |||
| 69 | 8400 | bool teardown_caller_authorized() noexcept | |
| 70 | { | ||
| 71 |
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8400 | return lifecycle().context_permits_blocking() || lifecycle().is_worker_thread(); |
| 72 | } | ||
| 73 | |||
| 74 | 8365 | bool blocking_teardown_permitted() noexcept | |
| 75 | { | ||
| 76 | // Authorization comes from the explicit context or the worker identity; the heuristic only ever subtracts | ||
| 77 | // from it. Evaluated in this order so the cheap atomic loads reject a loader callback without paying for | ||
| 78 | // the PEB probe. | ||
| 79 |
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8365 | return teardown_caller_authorized() && !is_loader_lock_held(); |
| 80 | } | ||
| 81 | } // namespace detail | ||
| 82 | } // namespace DetourModKit | ||
| 83 |