xref: /freebsd/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_thread_registry.h (revision c66ec88fed842fbaad62c30d510644ceb7bd2d71)
1 //===-- sanitizer_thread_registry.h -----------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file is shared between sanitizer tools.
10 //
11 // General thread bookkeeping functionality.
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef SANITIZER_THREAD_REGISTRY_H
15 #define SANITIZER_THREAD_REGISTRY_H
16 
17 #include "sanitizer_common.h"
18 #include "sanitizer_list.h"
19 #include "sanitizer_mutex.h"
20 
21 namespace __sanitizer {
22 
23 enum ThreadStatus {
24   ThreadStatusInvalid,   // Non-existent thread, data is invalid.
25   ThreadStatusCreated,   // Created but not yet running.
26   ThreadStatusRunning,   // The thread is currently running.
27   ThreadStatusFinished,  // Joinable thread is finished but not yet joined.
28   ThreadStatusDead       // Joined, but some info is still available.
29 };
30 
31 enum class ThreadType {
32   Regular, // Normal thread
33   Worker,  // macOS Grand Central Dispatch (GCD) worker thread
34   Fiber,   // Fiber
35 };
36 
37 // Generic thread context. Specific sanitizer tools may inherit from it.
38 // If thread is dead, context may optionally be reused for a new thread.
39 class ThreadContextBase {
40  public:
41   explicit ThreadContextBase(u32 tid);
42   ~ThreadContextBase();  // Should never be called.
43 
44   const u32 tid;  // Thread ID. Main thread should have tid = 0.
45   u64 unique_id;  // Unique thread ID.
46   u32 reuse_count;  // Number of times this tid was reused.
47   tid_t os_id;     // PID (used for reporting).
48   uptr user_id;   // Some opaque user thread id (e.g. pthread_t).
49   char name[64];  // As annotated by user.
50 
51   ThreadStatus status;
52   bool detached;
53   ThreadType thread_type;
54 
55   u32 parent_tid;
56   ThreadContextBase *next;  // For storing thread contexts in a list.
57 
58   atomic_uint32_t thread_destroyed; // To address race of Joined vs Finished
59 
60   void SetName(const char *new_name);
61 
62   void SetDead();
63   void SetJoined(void *arg);
64   void SetFinished();
65   void SetStarted(tid_t _os_id, ThreadType _thread_type, void *arg);
66   void SetCreated(uptr _user_id, u64 _unique_id, bool _detached,
67                   u32 _parent_tid, void *arg);
68   void Reset();
69 
70   void SetDestroyed();
71   bool GetDestroyed();
72 
73   // The following methods may be overriden by subclasses.
74   // Some of them take opaque arg that may be optionally be used
75   // by subclasses.
76   virtual void OnDead() {}
77   virtual void OnJoined(void *arg) {}
78   virtual void OnFinished() {}
79   virtual void OnStarted(void *arg) {}
80   virtual void OnCreated(void *arg) {}
81   virtual void OnReset() {}
82   virtual void OnDetached(void *arg) {}
83 };
84 
85 typedef ThreadContextBase* (*ThreadContextFactory)(u32 tid);
86 
87 class ThreadRegistry {
88  public:
89   static const u32 kUnknownTid;
90 
91   ThreadRegistry(ThreadContextFactory factory, u32 max_threads,
92                  u32 thread_quarantine_size, u32 max_reuse = 0);
93   void GetNumberOfThreads(uptr *total = nullptr, uptr *running = nullptr,
94                           uptr *alive = nullptr);
95   uptr GetMaxAliveThreads();
96 
97   void Lock() { mtx_.Lock(); }
98   void CheckLocked() { mtx_.CheckLocked(); }
99   void Unlock() { mtx_.Unlock(); }
100 
101   // Should be guarded by ThreadRegistryLock.
102   ThreadContextBase *GetThreadLocked(u32 tid) {
103     DCHECK_LT(tid, n_contexts_);
104     return threads_[tid];
105   }
106 
107   u32 CreateThread(uptr user_id, bool detached, u32 parent_tid, void *arg);
108 
109   typedef void (*ThreadCallback)(ThreadContextBase *tctx, void *arg);
110   // Invokes callback with a specified arg for each thread context.
111   // Should be guarded by ThreadRegistryLock.
112   void RunCallbackForEachThreadLocked(ThreadCallback cb, void *arg);
113 
114   typedef bool (*FindThreadCallback)(ThreadContextBase *tctx, void *arg);
115   // Finds a thread using the provided callback. Returns kUnknownTid if no
116   // thread is found.
117   u32 FindThread(FindThreadCallback cb, void *arg);
118   // Should be guarded by ThreadRegistryLock. Return 0 if no thread
119   // is found.
120   ThreadContextBase *FindThreadContextLocked(FindThreadCallback cb,
121                                              void *arg);
122   ThreadContextBase *FindThreadContextByOsIDLocked(tid_t os_id);
123 
124   void SetThreadName(u32 tid, const char *name);
125   void SetThreadNameByUserId(uptr user_id, const char *name);
126   void DetachThread(u32 tid, void *arg);
127   void JoinThread(u32 tid, void *arg);
128   void FinishThread(u32 tid);
129   void StartThread(u32 tid, tid_t os_id, ThreadType thread_type, void *arg);
130   void SetThreadUserId(u32 tid, uptr user_id);
131 
132  private:
133   const ThreadContextFactory context_factory_;
134   const u32 max_threads_;
135   const u32 thread_quarantine_size_;
136   const u32 max_reuse_;
137 
138   BlockingMutex mtx_;
139 
140   u32 n_contexts_;      // Number of created thread contexts,
141                         // at most max_threads_.
142   u64 total_threads_;   // Total number of created threads. May be greater than
143                         // max_threads_ if contexts were reused.
144   uptr alive_threads_;  // Created or running.
145   uptr max_alive_threads_;
146   uptr running_threads_;
147 
148   ThreadContextBase **threads_;  // Array of thread contexts is leaked.
149   IntrusiveList<ThreadContextBase> dead_threads_;
150   IntrusiveList<ThreadContextBase> invalid_threads_;
151 
152   void QuarantinePush(ThreadContextBase *tctx);
153   ThreadContextBase *QuarantinePop();
154 };
155 
156 typedef GenericScopedLock<ThreadRegistry> ThreadRegistryLock;
157 
158 } // namespace __sanitizer
159 
160 #endif // SANITIZER_THREAD_REGISTRY_H
161