1 //===-- sanitizer_thread_registry.h -----------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is shared between sanitizer tools.
12 // General thread bookkeeping functionality.
13 //===----------------------------------------------------------------------===//
15 #ifndef SANITIZER_THREAD_REGISTRY_H
16 #define SANITIZER_THREAD_REGISTRY_H
18 #include "sanitizer_common.h"
19 #include "sanitizer_list.h"
20 #include "sanitizer_mutex.h"
22 namespace __sanitizer {
25 ThreadStatusInvalid, // Non-existent thread, data is invalid.
26 ThreadStatusCreated, // Created but not yet running.
27 ThreadStatusRunning, // The thread is currently running.
28 ThreadStatusFinished, // Joinable thread is finished but not yet joined.
29 ThreadStatusDead // Joined, but some info is still available.
32 // Generic thread context. Specific sanitizer tools may inherit from it.
33 // If thread is dead, context may optionally be reused for a new thread.
34 class ThreadContextBase {
36 explicit ThreadContextBase(u32 tid);
37 ~ThreadContextBase(); // Should never be called.
39 const u32 tid; // Thread ID. Main thread should have tid = 0.
40 u64 unique_id; // Unique thread ID.
41 u32 reuse_count; // Number of times this tid was reused.
42 uptr os_id; // PID (used for reporting).
43 uptr user_id; // Some opaque user thread id (e.g. pthread_t).
44 char name[64]; // As annotated by user.
50 ThreadContextBase *next; // For storing thread contexts in a list.
52 void SetName(const char *new_name);
55 void SetJoined(void *arg);
57 void SetStarted(uptr _os_id, void *arg);
58 void SetCreated(uptr _user_id, u64 _unique_id, bool _detached,
59 u32 _parent_tid, void *arg);
62 // The following methods may be overriden by subclasses.
63 // Some of them take opaque arg that may be optionally be used
65 virtual void OnDead() {}
66 virtual void OnJoined(void *arg) {}
67 virtual void OnFinished() {}
68 virtual void OnStarted(void *arg) {}
69 virtual void OnCreated(void *arg) {}
70 virtual void OnReset() {}
71 virtual void OnDetached(void *arg) {}
74 typedef ThreadContextBase* (*ThreadContextFactory)(u32 tid);
76 class ThreadRegistry {
78 static const u32 kUnknownTid;
80 ThreadRegistry(ThreadContextFactory factory, u32 max_threads,
81 u32 thread_quarantine_size, u32 max_reuse = 0);
82 void GetNumberOfThreads(uptr *total = nullptr, uptr *running = nullptr,
83 uptr *alive = nullptr);
84 uptr GetMaxAliveThreads();
86 void Lock() { mtx_.Lock(); }
87 void CheckLocked() { mtx_.CheckLocked(); }
88 void Unlock() { mtx_.Unlock(); }
90 // Should be guarded by ThreadRegistryLock.
91 ThreadContextBase *GetThreadLocked(u32 tid) {
92 DCHECK_LT(tid, n_contexts_);
96 u32 CreateThread(uptr user_id, bool detached, u32 parent_tid, void *arg);
98 typedef void (*ThreadCallback)(ThreadContextBase *tctx, void *arg);
99 // Invokes callback with a specified arg for each thread context.
100 // Should be guarded by ThreadRegistryLock.
101 void RunCallbackForEachThreadLocked(ThreadCallback cb, void *arg);
103 typedef bool (*FindThreadCallback)(ThreadContextBase *tctx, void *arg);
104 // Finds a thread using the provided callback. Returns kUnknownTid if no
106 u32 FindThread(FindThreadCallback cb, void *arg);
107 // Should be guarded by ThreadRegistryLock. Return 0 if no thread
109 ThreadContextBase *FindThreadContextLocked(FindThreadCallback cb,
111 ThreadContextBase *FindThreadContextByOsIDLocked(uptr os_id);
113 void SetThreadName(u32 tid, const char *name);
114 void SetThreadNameByUserId(uptr user_id, const char *name);
115 void DetachThread(u32 tid, void *arg);
116 void JoinThread(u32 tid, void *arg);
117 void FinishThread(u32 tid);
118 void StartThread(u32 tid, uptr os_id, void *arg);
121 const ThreadContextFactory context_factory_;
122 const u32 max_threads_;
123 const u32 thread_quarantine_size_;
124 const u32 max_reuse_;
128 u32 n_contexts_; // Number of created thread contexts,
129 // at most max_threads_.
130 u64 total_threads_; // Total number of created threads. May be greater than
131 // max_threads_ if contexts were reused.
132 uptr alive_threads_; // Created or running.
133 uptr max_alive_threads_;
134 uptr running_threads_;
136 ThreadContextBase **threads_; // Array of thread contexts is leaked.
137 IntrusiveList<ThreadContextBase> dead_threads_;
138 IntrusiveList<ThreadContextBase> invalid_threads_;
140 void QuarantinePush(ThreadContextBase *tctx);
141 ThreadContextBase *QuarantinePop();
144 typedef GenericScopedLock<ThreadRegistry> ThreadRegistryLock;
146 } // namespace __sanitizer
148 #endif // SANITIZER_THREAD_REGISTRY_H