1 //===-- sanitizer_stoptheworld.h --------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // Defines the StopTheWorld function which suspends the execution of the current 11 // process and runs the user-supplied callback in the same address space. 12 // 13 //===----------------------------------------------------------------------===// 14 #ifndef SANITIZER_STOPTHEWORLD_H 15 #define SANITIZER_STOPTHEWORLD_H 16 17 #include "sanitizer_internal_defs.h" 18 #include "sanitizer_common.h" 19 20 namespace __sanitizer { 21 typedef int SuspendedThreadID; 22 23 // Holds the list of suspended threads and provides an interface to dump their 24 // register contexts. 25 class SuspendedThreadsList { 26 public: 27 SuspendedThreadsList() 28 : thread_ids_(1024) {} 29 SuspendedThreadID GetThreadID(uptr index) const { 30 CHECK_LT(index, thread_ids_.size()); 31 return thread_ids_[index]; 32 } 33 int GetRegistersAndSP(uptr index, uptr *buffer, uptr *sp) const; 34 // The buffer in GetRegistersAndSP should be at least this big. 35 static uptr RegisterCount(); 36 uptr thread_count() const { return thread_ids_.size(); } 37 bool Contains(SuspendedThreadID thread_id) const { 38 for (uptr i = 0; i < thread_ids_.size(); i++) { 39 if (thread_ids_[i] == thread_id) 40 return true; 41 } 42 return false; 43 } 44 void Append(SuspendedThreadID thread_id) { 45 thread_ids_.push_back(thread_id); 46 } 47 48 private: 49 InternalMmapVector<SuspendedThreadID> thread_ids_; 50 51 // Prohibit copy and assign. 52 SuspendedThreadsList(const SuspendedThreadsList&); 53 void operator=(const SuspendedThreadsList&); 54 }; 55 56 typedef void (*StopTheWorldCallback)( 57 const SuspendedThreadsList &suspended_threads_list, 58 void *argument); 59 60 // Suspend all threads in the current process and run the callback on the list 61 // of suspended threads. This function will resume the threads before returning. 62 // The callback should not call any libc functions. The callback must not call 63 // exit() nor _exit() and instead return to the caller. 64 // This function should NOT be called from multiple threads simultaneously. 65 void StopTheWorld(StopTheWorldCallback callback, void *argument); 66 67 } // namespace __sanitizer 68 69 #endif // SANITIZER_STOPTHEWORLD_H 70
