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//===-- sanitizer_stoptheworld.h --------------------------------*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// Defines the StopTheWorld function which suspends the execution of the current
// process and runs the user-supplied callback in the same address space.
#include "sanitizer_internal_defs.h"
#include "sanitizer_common.h"
namespace __sanitizer {
typedef int SuspendedThreadID;
// Holds the list of suspended threads and provides an interface to dump their
// register contexts.
class SuspendedThreadsList {
: thread_ids_(1024) {}
SuspendedThreadID GetThreadID(uptr index) const {
CHECK_LT(index, thread_ids_.size());
return thread_ids_[index];
int GetRegistersAndSP(uptr index, uptr *buffer, uptr *sp) const;
// The buffer in GetRegistersAndSP should be at least this big.
static uptr RegisterCount();
uptr thread_count() const { return thread_ids_.size(); }
bool Contains(SuspendedThreadID thread_id) const {
for (uptr i = 0; i < thread_ids_.size(); i++) {
if (thread_ids_[i] == thread_id)
return true;
return false;
void Append(SuspendedThreadID thread_id) {
InternalMmapVector<SuspendedThreadID> thread_ids_;
// Prohibit copy and assign.
SuspendedThreadsList(const SuspendedThreadsList&);
void operator=(const SuspendedThreadsList&);
typedef void (*StopTheWorldCallback)(
const SuspendedThreadsList &suspended_threads_list,
void *argument);
// Suspend all threads in the current process and run the callback on the list
// of suspended threads. This function will resume the threads before returning.
// The callback should not call any libc functions. The callback must not call
// exit() nor _exit() and instead return to the caller.
// This function should NOT be called from multiple threads simultaneously.
void StopTheWorld(StopTheWorldCallback callback, void *argument);
} // namespace __sanitizer