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// RUN: %clangxx_tsan %s -o %t -DLockType=PthreadMutex
// RUN: TSAN_OPTIONS=detect_deadlocks=1 %deflake %run %t | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-NOT-SECOND
// RUN: TSAN_OPTIONS="detect_deadlocks=1 second_deadlock_stack=1" %deflake %run %t | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-SECOND
// RUN: %clangxx_tsan %s -o %t -DLockType=PthreadSpinLock
// RUN: TSAN_OPTIONS=detect_deadlocks=1 %deflake %run %t | FileCheck %s
// RUN: %clangxx_tsan %s -o %t -DLockType=PthreadRWLock
// RUN: TSAN_OPTIONS=detect_deadlocks=1 %deflake %run %t | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-RD
// RUN: %clangxx_tsan %s -o %t -DLockType=PthreadRecursiveMutex
// RUN: TSAN_OPTIONS=detect_deadlocks=1 %deflake %run %t | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-REC
#include "test.h"
#undef NDEBUG
#include <assert.h>
#include <new>
#ifndef LockType
#define LockType PthreadMutex
#endif
// You can optionally pass [test_number [iter_count]] on command line.
static int test_number = -1;
static int iter_count = 100000;
class PthreadMutex {
public:
explicit PthreadMutex(bool recursive = false) {
if (recursive) {
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
assert(0 == pthread_mutex_init(&mu_, &attr));
} else {
assert(0 == pthread_mutex_init(&mu_, 0));
}
}
~PthreadMutex() {
assert(0 == pthread_mutex_destroy(&mu_));
(void)padding_;
}
static bool supports_read_lock() { return false; }
static bool supports_recursive_lock() { return false; }
void lock() { assert(0 == pthread_mutex_lock(&mu_)); }
void unlock() { assert(0 == pthread_mutex_unlock(&mu_)); }
bool try_lock() { return 0 == pthread_mutex_trylock(&mu_); }
void rdlock() { assert(0); }
void rdunlock() { assert(0); }
bool try_rdlock() { assert(0); }
private:
pthread_mutex_t mu_;
char padding_[64 - sizeof(pthread_mutex_t)];
};
class PthreadRecursiveMutex : public PthreadMutex {
public:
PthreadRecursiveMutex() : PthreadMutex(true) { }
static bool supports_recursive_lock() { return true; }
};
class PthreadSpinLock {
public:
PthreadSpinLock() { assert(0 == pthread_spin_init(&mu_, 0)); }
~PthreadSpinLock() {
assert(0 == pthread_spin_destroy(&mu_));
(void)padding_;
}
static bool supports_read_lock() { return false; }
static bool supports_recursive_lock() { return false; }
void lock() { assert(0 == pthread_spin_lock(&mu_)); }
void unlock() { assert(0 == pthread_spin_unlock(&mu_)); }
bool try_lock() { return 0 == pthread_spin_trylock(&mu_); }
void rdlock() { assert(0); }
void rdunlock() { assert(0); }
bool try_rdlock() { assert(0); }
private:
pthread_spinlock_t mu_;
char padding_[64 - sizeof(pthread_spinlock_t)];
};
class PthreadRWLock {
public:
PthreadRWLock() { assert(0 == pthread_rwlock_init(&mu_, 0)); }
~PthreadRWLock() {
assert(0 == pthread_rwlock_destroy(&mu_));
(void)padding_;
}
static bool supports_read_lock() { return true; }
static bool supports_recursive_lock() { return false; }
void lock() { assert(0 == pthread_rwlock_wrlock(&mu_)); }
void unlock() { assert(0 == pthread_rwlock_unlock(&mu_)); }
bool try_lock() { return 0 == pthread_rwlock_trywrlock(&mu_); }
void rdlock() { assert(0 == pthread_rwlock_rdlock(&mu_)); }
void rdunlock() { assert(0 == pthread_rwlock_unlock(&mu_)); }
bool try_rdlock() { return 0 == pthread_rwlock_tryrdlock(&mu_); }
private:
pthread_rwlock_t mu_;
char padding_[64 - sizeof(pthread_rwlock_t)];
};
class LockTest {
public:
LockTest() : n_(), locks_() {}
void Init(size_t n) {
n_ = n;
locks_ = new LockType*[n_];
for (size_t i = 0; i < n_; i++)
locks_[i] = new LockType;
}
~LockTest() {
for (size_t i = 0; i < n_; i++)
delete locks_[i];
delete [] locks_;
}
void L(size_t i) {
assert(i < n_);
locks_[i]->lock();
}
void U(size_t i) {
assert(i < n_);
locks_[i]->unlock();
}
void RL(size_t i) {
assert(i < n_);
locks_[i]->rdlock();
}
void RU(size_t i) {
assert(i < n_);
locks_[i]->rdunlock();
}
void *A(size_t i) {
assert(i < n_);
return locks_[i];
}
bool T(size_t i) {
assert(i < n_);
return locks_[i]->try_lock();
}
// Simple lock order onversion.
void Test1() {
if (test_number > 0 && test_number != 1) return;
fprintf(stderr, "Starting Test1\n");
// CHECK: Starting Test1
Init(5);
fprintf(stderr, "Expecting lock inversion: %p %p\n", A(0), A(1));
// CHECK: Expecting lock inversion: [[A1:0x[a-f0-9]*]] [[A2:0x[a-f0-9]*]]
Lock_0_1();
Lock_1_0();
// CHECK: WARNING: ThreadSanitizer: lock-order-inversion (potential deadlock)
// CHECK: Cycle in lock order graph: [[M1:M[0-9]+]] ([[A1]]) => [[M2:M[0-9]+]] ([[A2]]) => [[M1]]
// CHECK: Mutex [[M2]] acquired here while holding mutex [[M1]]
// CHECK: #0 pthread_
// CHECK-SECOND: Mutex [[M1]] previously acquired by the same thread here:
// CHECK-SECOND: #0 pthread_
// CHECK-NOT-SECOND: second_deadlock_stack=1 to get more informative warning message
// CHECK-NOT-SECOND-NOT: #0 pthread_
// CHECK: Mutex [[M1]] acquired here while holding mutex [[M2]]
// CHECK: #0 pthread_
// CHECK-SECOND: Mutex [[M2]] previously acquired by the same thread here:
// CHECK-SECOND: #0 pthread_
// CHECK-NOT-SECOND-NOT: #0 pthread_
// CHECK-NOT: WARNING: ThreadSanitizer:
}
// Simple lock order inversion with 3 locks.
void Test2() {
if (test_number > 0 && test_number != 2) return;
fprintf(stderr, "Starting Test2\n");
// CHECK: Starting Test2
Init(5);
fprintf(stderr, "Expecting lock inversion: %p %p %p\n", A(0), A(1), A(2));
// CHECK: Expecting lock inversion: [[A1:0x[a-f0-9]*]] [[A2:0x[a-f0-9]*]] [[A3:0x[a-f0-9]*]]
Lock2(0, 1);
Lock2(1, 2);
Lock2(2, 0);
// CHECK: WARNING: ThreadSanitizer: lock-order-inversion (potential deadlock)
// CHECK: Cycle in lock order graph: [[M1:M[0-9]+]] ([[A1]]) => [[M2:M[0-9]+]] ([[A2]]) => [[M3:M[0-9]+]] ([[A3]]) => [[M1]]
// CHECK-NOT: WARNING: ThreadSanitizer:
}
// Lock order inversion with lots of new locks created (but not used)
// between. Since the new locks are not used we should still detect the
// deadlock.
void Test3() {
if (test_number > 0 && test_number != 3) return;
fprintf(stderr, "Starting Test3\n");
// CHECK: Starting Test3
Init(5);
Lock_0_1();
L(2);
CreateAndDestroyManyLocks();
U(2);
Lock_1_0();
// CHECK: WARNING: ThreadSanitizer: lock-order-inversion (potential deadlock)
// CHECK-NOT: WARNING: ThreadSanitizer:
}
// lock l0=>l1; then create and use lots of locks; then lock l1=>l0.
// The deadlock epoch should have changed and we should not report anything.
void Test4() {
if (test_number > 0 && test_number != 4) return;
fprintf(stderr, "Starting Test4\n");
// CHECK: Starting Test4
Init(5);
Lock_0_1();
L(2);
CreateLockUnlockAndDestroyManyLocks();
U(2);
Lock_1_0();
// CHECK-NOT: WARNING: ThreadSanitizer:
}
void Test5() {
if (test_number > 0 && test_number != 5) return;
fprintf(stderr, "Starting Test5\n");
// CHECK: Starting Test5
Init(5);
RunThreads(&LockTest::Lock_0_1<true>, &LockTest::Lock_1_0<true>);
// CHECK: WARNING: ThreadSanitizer: lock-order-inversion
// CHECK: Cycle in lock order graph: [[M1:M[0-9]+]] ({{.*}}) => [[M2:M[0-9]+]] ({{.*}}) => [[M1]]
// CHECK: Mutex [[M2]] acquired here while holding mutex [[M1]] in thread [[T1:T[0-9]+]]
// CHECK: Mutex [[M1]] acquired here while holding mutex [[M2]] in thread [[T2:T[0-9]+]]
// CHECK: Thread [[T1]] {{.*}} created by main thread
// CHECK: Thread [[T2]] {{.*}} created by main thread
// CHECK-NOT: WARNING: ThreadSanitizer:
}
void Test6() {
if (test_number > 0 && test_number != 6) return;
fprintf(stderr, "Starting Test6: 3 threads lock/unlock private mutexes\n");
// CHECK: Starting Test6
Init(100);
// CHECK-NOT: WARNING: ThreadSanitizer:
RunThreads(&LockTest::Lock1_Loop_0, &LockTest::Lock1_Loop_1,
&LockTest::Lock1_Loop_2);
}
void Test7() {
if (test_number > 0 && test_number != 7) return;
fprintf(stderr, "Starting Test7\n");
// CHECK: Starting Test7
Init(10);
L(0); T(1); U(1); U(0);
T(1); L(0); U(1); U(0);
// CHECK-NOT: WARNING: ThreadSanitizer:
fprintf(stderr, "No cycle: 0=>1\n");
// CHECK: No cycle: 0=>1
T(2); L(3); U(3); U(2);
L(3); T(2); U(3); U(2);
// CHECK-NOT: WARNING: ThreadSanitizer:
fprintf(stderr, "No cycle: 2=>3\n");
// CHECK: No cycle: 2=>3
T(4); L(5); U(4); U(5);
L(5); L(4); U(4); U(5);
// CHECK: WARNING: ThreadSanitizer: lock-order-inversion
fprintf(stderr, "Have cycle: 4=>5\n");
// CHECK: Have cycle: 4=>5
L(7); L(6); U(6); U(7);
T(6); L(7); U(6); U(7);
// CHECK: WARNING: ThreadSanitizer: lock-order-inversion
fprintf(stderr, "Have cycle: 6=>7\n");
// CHECK: Have cycle: 6=>7
}
void Test8() {
if (test_number > 0 && test_number != 8) return;
if (!LockType::supports_read_lock()) return;
fprintf(stderr, "Starting Test8\n");
Init(5);
// CHECK-RD: Starting Test8
RL(0); L(1); RU(0); U(1);
L(1); RL(0); RU(0); U(1);
// CHECK-RD: WARNING: ThreadSanitizer: lock-order-inversion
fprintf(stderr, "Have cycle: 0=>1\n");
// CHECK-RD: Have cycle: 0=>1
RL(2); RL(3); RU(2); RU(3);
RL(3); RL(2); RU(2); RU(3);
// CHECK-RD: WARNING: ThreadSanitizer: lock-order-inversion
fprintf(stderr, "Have cycle: 2=>3\n");
// CHECK-RD: Have cycle: 2=>3
}
void Test9() {
if (test_number > 0 && test_number != 9) return;
if (!LockType::supports_recursive_lock()) return;
fprintf(stderr, "Starting Test9\n");
// CHECK-REC: Starting Test9
Init(5);
L(0); L(0); L(0); L(1); U(1); U(0); U(0); U(0);
L(1); L(1); L(1); L(0); U(0); U(1); U(1); U(1);
// CHECK-REC: WARNING: ThreadSanitizer: lock-order-inversion
}
void Test10() {
if (test_number > 0 && test_number != 10) return;
fprintf(stderr, "Starting Test10: 4 threads lock/unlock 4 private mutexes, one under another\n");
// CHECK: Starting Test10
Init(100);
// CHECK-NOT: WARNING: ThreadSanitizer:
RunThreads(&LockTest::Test10_Thread1, &LockTest::Test10_Thread2,
&LockTest::Test10_Thread3, &LockTest::Test10_Thread4);
}
void Test10_Thread1() { Test10_Thread(0); }
void Test10_Thread2() { Test10_Thread(10); }
void Test10_Thread3() { Test10_Thread(20); }
void Test10_Thread4() { Test10_Thread(30); }
void Test10_Thread(size_t m) {
for (int i = 0; i < iter_count; i++) {
L(m + 0);
L(m + 1);
L(m + 2);
L(m + 3);
U(m + 3);
U(m + 2);
U(m + 1);
U(m + 0);
}
}
void Test11() {
if (test_number > 0 && test_number != 11) return;
fprintf(stderr, "Starting Test11: 4 threads lock/unlock 4 private mutexes, all under another private mutex\n");
// CHECK: Starting Test11
Init(500);
// CHECK-NOT: WARNING: ThreadSanitizer:
RunThreads(&LockTest::Test11_Thread1, &LockTest::Test11_Thread2,
&LockTest::Test11_Thread3, &LockTest::Test11_Thread4);
}
void Test11_Thread1() { Test10_Thread(0); }
void Test11_Thread2() { Test10_Thread(10); }
void Test11_Thread3() { Test10_Thread(20); }
void Test11_Thread4() { Test10_Thread(30); }
void Test11_Thread(size_t m) {
for (int i = 0; i < iter_count; i++) {
L(m);
L(m + 100);
U(m + 100);
L(m + 200);
U(m + 200);
L(m + 300);
U(m + 300);
L(m + 400);
U(m + 500);
U(m);
}
}
void Test12() {
if (test_number > 0 && test_number != 12) return;
if (!LockType::supports_read_lock()) return;
fprintf(stderr, "Starting Test12: 4 threads read lock/unlock 4 shared mutexes, one under another\n");
// CHECK-RD: Starting Test12
Init(500);
// CHECK-RD-NOT: WARNING: ThreadSanitizer:
RunThreads(&LockTest::Test12_Thread, &LockTest::Test12_Thread,
&LockTest::Test12_Thread, &LockTest::Test12_Thread);
}
void Test12_Thread() {
for (int i = 0; i < iter_count; i++) {
RL(000);
RL(100);
RL(200);
RL(300);
RU(300);
RU(200);
RU(100);
RU(000);
}
}
void Test13() {
if (test_number > 0 && test_number != 13) return;
if (!LockType::supports_read_lock()) return;
fprintf(stderr, "Starting Test13: 4 threads read lock/unlock 4 shared mutexes, all under another shared mutex\n");
// CHECK-RD: Starting Test13
Init(500);
// CHECK-RD-NOT: WARNING: ThreadSanitizer:
RunThreads(&LockTest::Test13_Thread, &LockTest::Test13_Thread,
&LockTest::Test13_Thread, &LockTest::Test13_Thread);
}
void Test13_Thread() {
for (int i = 0; i < iter_count; i++) {
RL(0);
RL(100);
RU(100);
RL(200);
RU(200);
RL(300);
RU(300);
RL(400);
RU(400);
RU(0);
}
}
void Test14() {
if (test_number > 0 && test_number != 14) return;
fprintf(stderr, "Starting Test14: create lots of locks in 4 threads\n");
Init(10);
// CHECK-RD: Starting Test14
RunThreads(&LockTest::CreateAndDestroyLocksLoop,
&LockTest::CreateAndDestroyLocksLoop,
&LockTest::CreateAndDestroyLocksLoop,
&LockTest::CreateAndDestroyLocksLoop);
}
void Test15() {
if (test_number > 0 && test_number != 15) return;
if (!LockType::supports_read_lock()) return;
fprintf(stderr, "Starting Test15: recursive rlock\n");
// DISABLEDCHECK-RD: Starting Test15
Init(5);
RL(0); RL(0); RU(0); RU(0); // Recusrive reader lock.
RL(0); RL(0); RL(0); RU(0); RU(0); RU(0); // Recusrive reader lock.
}
// More detailed output test.
void Test16() {
if (test_number > 0 && test_number != 16) return;
fprintf(stderr, "Starting Test16: detailed output test with two locks\n");
// CHECK: Starting Test16
// CHECK: WARNING: ThreadSanitizer: lock-order-inversion
// CHECK: acquired here while holding mutex
// CHECK: LockTest::Acquire1
// CHECK-NEXT: LockTest::Acquire_0_then_1
// CHECK-SECOND: previously acquired by the same thread here
// CHECK-SECOND: LockTest::Acquire0
// CHECK-SECOND-NEXT: LockTest::Acquire_0_then_1
// CHECK: acquired here while holding mutex
// CHECK: LockTest::Acquire0
// CHECK-NEXT: LockTest::Acquire_1_then_0
// CHECK-SECOND: previously acquired by the same thread here
// CHECK-SECOND: LockTest::Acquire1
// CHECK-SECOND-NEXT: LockTest::Acquire_1_then_0
Init(5);
Acquire_0_then_1();
U(0); U(1);
Acquire_1_then_0();
U(0); U(1);
}
// More detailed output test.
void Test17() {
if (test_number > 0 && test_number != 17) return;
fprintf(stderr, "Starting Test17: detailed output test with three locks\n");
// CHECK: Starting Test17
// CHECK: WARNING: ThreadSanitizer: lock-order-inversion
// CHECK: LockTest::Acquire1
// CHECK-NEXT: LockTest::Acquire_0_then_1
// CHECK: LockTest::Acquire2
// CHECK-NEXT: LockTest::Acquire_1_then_2
// CHECK: LockTest::Acquire0
// CHECK-NEXT: LockTest::Acquire_2_then_0
Init(5);
Acquire_0_then_1();
U(0); U(1);
Acquire_1_then_2();
U(1); U(2);
Acquire_2_then_0();
U(0); U(2);
}
__attribute__((noinline)) void Acquire2() { L(2); }
__attribute__((noinline)) void Acquire1() { L(1); }
__attribute__((noinline)) void Acquire0() { L(0); }
__attribute__((noinline)) void Acquire_1_then_0() { Acquire1(); Acquire0(); }
__attribute__((noinline)) void Acquire_0_then_1() { Acquire0(); Acquire1(); }
__attribute__((noinline)) void Acquire_1_then_2() { Acquire1(); Acquire2(); }
__attribute__((noinline)) void Acquire_2_then_0() { Acquire2(); Acquire0(); }
// This test creates, locks, unlocks and destroys lots of mutexes.
void Test18() {
if (test_number > 0 && test_number != 18) return;
fprintf(stderr, "Starting Test18: create, lock and destroy 4 locks; all in "
"4 threads in a loop\n");
RunThreads(&LockTest::Test18_Thread, &LockTest::Test18_Thread,
&LockTest::Test18_Thread, &LockTest::Test18_Thread);
}
void Test18_Thread() {
LockType *l = new LockType[4];
for (size_t i = 0; i < iter_count / 100; i++) {
for (int i = 0; i < 4; i++) l[i].lock();
for (int i = 0; i < 4; i++) l[i].unlock();
for (int i = 0; i < 4; i++) l[i].~LockType();
for (int i = 0; i < 4; i++) new ((void*)&l[i]) LockType();
}
delete [] l;
}
private:
void Lock2(size_t l1, size_t l2) { L(l1); L(l2); U(l2); U(l1); }
template<bool wait = false>
void Lock_0_1() {
Lock2(0, 1);
if (wait)
barrier_wait(&barrier);
}
template<bool wait = false>
void Lock_1_0() {
if (wait)
barrier_wait(&barrier);
Lock2(1, 0);
}
void Lock1_Loop(size_t i, size_t n_iter) {
for (size_t it = 0; it < n_iter; it++) {
// if ((it & (it - 1)) == 0) fprintf(stderr, "%zd", i);
L(i);
U(i);
}
// fprintf(stderr, "\n");
}
void Lock1_Loop_0() { Lock1_Loop(0, iter_count); }
void Lock1_Loop_1() { Lock1_Loop(10, iter_count); }
void Lock1_Loop_2() { Lock1_Loop(20, iter_count); }
void CreateAndDestroyManyLocks() {
LockType *create_many_locks_but_never_acquire =
new LockType[kDeadlockGraphSize];
(void)create_many_locks_but_never_acquire;
delete [] create_many_locks_but_never_acquire;
}
void CreateAndDestroyLocksLoop() {
for (size_t it = 0; it <= iter_count; it++) {
LockType some_locks[10];
(void)some_locks;
}
}
void CreateLockUnlockAndDestroyManyLocks() {
LockType many_locks[kDeadlockGraphSize];
for (size_t i = 0; i < kDeadlockGraphSize; i++) {
many_locks[i].lock();
many_locks[i].unlock();
}
}
// LockTest Member function callback.
struct CB {
void (LockTest::*f)();
LockTest *lt;
};
// Thread function with CB.
static void *Thread(void *param) {
CB *cb = (CB*)param;
(cb->lt->*cb->f)();
return NULL;
}
void RunThreads(void (LockTest::*f1)(), void (LockTest::*f2)(),
void (LockTest::*f3)() = 0, void (LockTest::*f4)() = 0) {
const int kNumThreads = 4;
pthread_t t[kNumThreads];
CB cb[kNumThreads] = {{f1, this}, {f2, this}, {f3, this}, {f4, this}};
for (int i = 0; i < kNumThreads && cb[i].f; i++)
pthread_create(&t[i], 0, Thread, &cb[i]);
for (int i = 0; i < kNumThreads && cb[i].f; i++)
pthread_join(t[i], 0);
}
static const size_t kDeadlockGraphSize = 4096;
size_t n_;
LockType **locks_;
};
int main(int argc, char **argv) {
barrier_init(&barrier, 2);
if (argc > 1)
test_number = atoi(argv[1]);
if (argc > 2)
iter_count = atoi(argv[2]);
LockTest().Test1();
LockTest().Test2();
LockTest().Test3();
LockTest().Test4();
LockTest().Test5();
LockTest().Test6();
LockTest().Test7();
LockTest().Test8();
LockTest().Test9();
LockTest().Test10();
LockTest().Test11();
LockTest().Test12();
LockTest().Test13();
LockTest().Test14();
LockTest().Test15();
LockTest().Test16();
LockTest().Test17();
LockTest().Test18();
fprintf(stderr, "ALL-DONE\n");
// CHECK: ALL-DONE
}
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