#endif
// iOS doesn't define _mm_cvtsi64_si128 and friends
-#if (FOLLY_SSE >= 2) && !FOLLY_MOBILE
+#if (FOLLY_SSE >= 2) && !FOLLY_MOBILE && FOLLY_X64
#define RW_SPINLOCK_USE_SSE_INSTRUCTIONS_
#else
#undef RW_SPINLOCK_USE_SSE_INSTRUCTIONS_
void lock() {
uint_fast32_t count = 0;
while (!LIKELY(try_lock())) {
- if (++count > 1000) std::this_thread::yield();
+ if (++count > 1000) {
+ std::this_thread::yield();
+ }
}
}
void lock_shared() {
uint_fast32_t count = 0;
while (!LIKELY(try_lock_shared())) {
- if (++count > 1000) std::this_thread::yield();
+ if (++count > 1000) {
+ std::this_thread::yield();
+ }
}
}
void lock_upgrade() {
uint_fast32_t count = 0;
while (!try_lock_upgrade()) {
- if (++count > 1000) std::this_thread::yield();
+ if (++count > 1000) {
+ std::this_thread::yield();
+ }
}
}
void unlock_upgrade_and_lock() {
int64_t count = 0;
while (!try_unlock_upgrade_and_lock()) {
- if (++count > 1000) std::this_thread::yield();
+ if (++count > 1000) {
+ std::this_thread::yield();
+ }
}
}
class ReadHolder {
public:
explicit ReadHolder(RWSpinLock* lock) : lock_(lock) {
- if (lock_) lock_->lock_shared();
+ if (lock_) {
+ lock_->lock_shared();
+ }
}
explicit ReadHolder(RWSpinLock& lock) : lock_(&lock) {
// down-grade
explicit ReadHolder(UpgradedHolder&& upgraded) : lock_(upgraded.lock_) {
upgraded.lock_ = nullptr;
- if (lock_) lock_->unlock_upgrade_and_lock_shared();
+ if (lock_) {
+ lock_->unlock_upgrade_and_lock_shared();
+ }
}
explicit ReadHolder(WriteHolder&& writer) : lock_(writer.lock_) {
writer.lock_ = nullptr;
- if (lock_) lock_->unlock_and_lock_shared();
+ if (lock_) {
+ lock_->unlock_and_lock_shared();
+ }
}
ReadHolder& operator=(ReadHolder&& other) {
ReadHolder(const ReadHolder& other) = delete;
ReadHolder& operator=(const ReadHolder& other) = delete;
- ~ReadHolder() { if (lock_) lock_->unlock_shared(); }
+ ~ReadHolder() {
+ if (lock_) {
+ lock_->unlock_shared();
+ }
+ }
void reset(RWSpinLock* lock = nullptr) {
- if (lock == lock_) return;
- if (lock_) lock_->unlock_shared();
+ if (lock == lock_) {
+ return;
+ }
+ if (lock_) {
+ lock_->unlock_shared();
+ }
lock_ = lock;
- if (lock_) lock_->lock_shared();
+ if (lock_) {
+ lock_->lock_shared();
+ }
}
void swap(ReadHolder* other) {
class UpgradedHolder {
public:
explicit UpgradedHolder(RWSpinLock* lock) : lock_(lock) {
- if (lock_) lock_->lock_upgrade();
+ if (lock_) {
+ lock_->lock_upgrade();
+ }
}
explicit UpgradedHolder(RWSpinLock& lock) : lock_(&lock) {
explicit UpgradedHolder(WriteHolder&& writer) {
lock_ = writer.lock_;
writer.lock_ = nullptr;
- if (lock_) lock_->unlock_and_lock_upgrade();
+ if (lock_) {
+ lock_->unlock_and_lock_upgrade();
+ }
}
UpgradedHolder(UpgradedHolder&& other) noexcept : lock_(other.lock_) {
UpgradedHolder(const UpgradedHolder& other) = delete;
UpgradedHolder& operator =(const UpgradedHolder& other) = delete;
- ~UpgradedHolder() { if (lock_) lock_->unlock_upgrade(); }
+ ~UpgradedHolder() {
+ if (lock_) {
+ lock_->unlock_upgrade();
+ }
+ }
void reset(RWSpinLock* lock = nullptr) {
- if (lock == lock_) return;
- if (lock_) lock_->unlock_upgrade();
+ if (lock == lock_) {
+ return;
+ }
+ if (lock_) {
+ lock_->unlock_upgrade();
+ }
lock_ = lock;
- if (lock_) lock_->lock_upgrade();
+ if (lock_) {
+ lock_->lock_upgrade();
+ }
}
void swap(UpgradedHolder* other) {
class WriteHolder {
public:
explicit WriteHolder(RWSpinLock* lock) : lock_(lock) {
- if (lock_) lock_->lock();
+ if (lock_) {
+ lock_->lock();
+ }
}
explicit WriteHolder(RWSpinLock& lock) : lock_(&lock) {
explicit WriteHolder(UpgradedHolder&& upgraded) {
lock_ = upgraded.lock_;
upgraded.lock_ = nullptr;
- if (lock_) lock_->unlock_upgrade_and_lock();
+ if (lock_) {
+ lock_->unlock_upgrade_and_lock();
+ }
}
WriteHolder(WriteHolder&& other) noexcept : lock_(other.lock_) {
WriteHolder(const WriteHolder& other) = delete;
WriteHolder& operator =(const WriteHolder& other) = delete;
- ~WriteHolder () { if (lock_) lock_->unlock(); }
+ ~WriteHolder() {
+ if (lock_) {
+ lock_->unlock();
+ }
+ }
void reset(RWSpinLock* lock = nullptr) {
- if (lock == lock_) return;
- if (lock_) lock_->unlock();
+ if (lock == lock_) {
+ return;
+ }
+ if (lock_) {
+ lock_->unlock();
+ }
lock_ = lock;
- if (lock_) lock_->lock();
+ if (lock_) {
+ lock_->lock();
+ }
}
void swap(WriteHolder* other) {
bool try_lock() {
RWTicket t;
FullInt old = t.whole = load_acquire(&ticket.whole);
- if (t.users != t.write) return false;
+ if (t.users != t.write) {
+ return false;
+ }
++t.users;
return __sync_bool_compare_and_swap(&ticket.whole, old, t.whole);
}
QuarterInt val = __sync_fetch_and_add(&ticket.users, 1);
while (val != load_acquire(&ticket.write)) {
asm_volatile_pause();
- if (UNLIKELY(++count > 1000)) std::this_thread::yield();
+ if (UNLIKELY(++count > 1000)) {
+ std::this_thread::yield();
+ }
}
}
uint_fast32_t count = 0;
while (!LIKELY(try_lock_shared())) {
asm_volatile_pause();
- if (UNLIKELY((++count & 1023) == 0)) std::this_thread::yield();
+ if (UNLIKELY((++count & 1023) == 0)) {
+ std::this_thread::yield();
+ }
}
}
ReadHolder& operator=(ReadHolder const&) = delete;
explicit ReadHolder(RWSpinLock* lock) : lock_(lock) {
- if (lock_) lock_->lock_shared();
+ if (lock_) {
+ lock_->lock_shared();
+ }
}
explicit ReadHolder(RWSpinLock &lock) : lock_ (&lock) {
- if (lock_) lock_->lock_shared();
+ if (lock_) {
+ lock_->lock_shared();
+ }
}
// atomically unlock the write-lock from writer and acquire the read-lock
}
~ReadHolder() {
- if (lock_) lock_->unlock_shared();
+ if (lock_) {
+ lock_->unlock_shared();
+ }
}
void reset(RWSpinLock *lock = nullptr) {
- if (lock_) lock_->unlock_shared();
+ if (lock_) {
+ lock_->unlock_shared();
+ }
lock_ = lock;
- if (lock_) lock_->lock_shared();
+ if (lock_) {
+ lock_->lock_shared();
+ }
}
void swap(ReadHolder *other) {
WriteHolder& operator=(WriteHolder const&) = delete;
explicit WriteHolder(RWSpinLock* lock) : lock_(lock) {
- if (lock_) lock_->lock();
+ if (lock_) {
+ lock_->lock();
+ }
}
explicit WriteHolder(RWSpinLock &lock) : lock_ (&lock) {
- if (lock_) lock_->lock();
+ if (lock_) {
+ lock_->lock();
+ }
}
~WriteHolder() {
- if (lock_) lock_->unlock();
+ if (lock_) {
+ lock_->unlock();
+ }
}
void reset(RWSpinLock *lock = nullptr) {
- if (lock == lock_) return;
- if (lock_) lock_->unlock();
+ if (lock == lock_) {
+ return;
+ }
+ if (lock_) {
+ lock_->unlock();
+ }
lock_ = lock;
- if (lock_) lock_->lock();
+ if (lock_) {
+ lock_->lock();
+ }
}
void swap(WriteHolder *other) {