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//===-- tsan_sync.h ---------------------------------------------*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This file is a part of ThreadSanitizer (TSan), a race detector.
#ifndef TSAN_SYNC_H
#define TSAN_SYNC_H
#include "sanitizer_common/sanitizer_atomic.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_deadlock_detector_interface.h"
#include "tsan_defs.h"
#include "tsan_clock.h"
#include "tsan_mutex.h"
#include "tsan_dense_alloc.h"
namespace __tsan {
struct SyncVar {
static const int kInvalidTid = -1;
uptr addr; // overwritten by DenseSlabAlloc freelist
Mutex mtx;
u64 uid; // Globally unique id.
u32 creation_stack_id;
int owner_tid; // Set only by exclusive owners.
u64 last_lock;
int recursion;
bool is_rw;
bool is_recursive;
bool is_broken;
bool is_linker_init;
u32 next; // in MetaMap
DDMutex dd;
SyncClock read_clock; // Used for rw mutexes only.
// The clock is placed last, so that it is situated on a different cache line
// with the mtx. This reduces contention for hot sync objects.
SyncClock clock;
void Init(ThreadState *thr, uptr pc, uptr addr, u64 uid);
void Reset(ThreadState *thr);
u64 GetId() const {
// 47 lsb is addr, then 14 bits is low part of uid, then 3 zero bits.
return GetLsb((u64)addr | (uid << 47), 61);
bool CheckId(u64 uid) const {
CHECK_EQ(uid, GetLsb(uid, 14));
return GetLsb(this->uid, 14) == uid;
static uptr SplitId(u64 id, u64 *uid) {
*uid = id >> 47;
return (uptr)GetLsb(id, 47);
/* MetaMap allows to map arbitrary user pointers onto various descriptors.
Currently it maps pointers to heap block descriptors and sync var descs.
It uses 1/2 direct shadow, see tsan_platform.h.
class MetaMap {
void AllocBlock(ThreadState *thr, uptr pc, uptr p, uptr sz);
uptr FreeBlock(ThreadState *thr, uptr pc, uptr p);
void FreeRange(ThreadState *thr, uptr pc, uptr p, uptr sz);
MBlock* GetBlock(uptr p);
SyncVar* GetOrCreateAndLock(ThreadState *thr, uptr pc,
uptr addr, bool write_lock);
SyncVar* GetIfExistsAndLock(uptr addr);
void MoveMemory(uptr src, uptr dst, uptr sz);
void OnThreadIdle(ThreadState *thr);
static const u32 kFlagMask = 3 << 30;
static const u32 kFlagBlock = 1 << 30;
static const u32 kFlagSync = 2 << 30;
typedef DenseSlabAlloc<MBlock, 1<<16, 1<<12> BlockAlloc;
typedef DenseSlabAlloc<SyncVar, 1<<16, 1<<10> SyncAlloc;
BlockAlloc block_alloc_;
SyncAlloc sync_alloc_;
atomic_uint64_t uid_gen_;
SyncVar* GetAndLock(ThreadState *thr, uptr pc, uptr addr, bool write_lock,
bool create);
} // namespace __tsan
#endif // TSAN_SYNC_H