public:
/// Construct free (unlocked) spin-lock
spin_lock() CDS_NOEXCEPT
- : m_spin( false )
# ifdef CDS_DEBUG
- , m_dbgOwnerId( OS::c_NullThreadId )
+ : m_dbgOwnerId( OS::c_NullThreadId )
# endif
- {}
+ {
+ m_spin.store( false, atomics::memory_order_release );
+ }
/// Construct spin-lock in specified state
/**
: m_dbgOwnerId( bLocked ? cds::OS::get_current_thread_id() : cds::OS::c_NullThreadId )
# endif
{
- m_spin.store( bLocked, atomics::memory_order_relaxed );
+ m_spin.store( bLocked, atomics::memory_order_release );
}
/// Dummy copy constructor
/**
- In theory, spin-lock cannot be copied. However, it is not practical.
- Therefore, we provide dummy copy constructor that do no copy in fact. The ctor
- initializes the spin to free (unlocked) state like default ctor.
+ The ctor initializes the spin to free (unlocked) state like the default ctor.
*/
spin_lock(const spin_lock<Backoff>& ) CDS_NOEXCEPT
: m_spin( false )
# ifdef CDS_DEBUG
, m_dbgOwnerId( cds::OS::c_NullThreadId )
# endif
- {}
+ {
+ CDS_TSAN_ANNOTATE_MUTEX_CREATE( this );
+ }
/// Destructor. On debug time it checks whether spin-lock is free
~spin_lock()
{
assert( !m_spin.load( atomics::memory_order_relaxed ));
+ CDS_TSAN_ANNOTATE_MUTEX_DESTROY( this );
}
/// Check if the spin is locked
*/
bool try_lock() CDS_NOEXCEPT
{
- bool bCurrent = false;
-
- m_spin.compare_exchange_strong( bCurrent, true, atomics::memory_order_acquire, atomics::memory_order_acquire );
+# ifdef CDS_THREAD_SANITIZER_ENABLED
+ bool bCurrent = m_spin.exchange( true, atomics::memory_order_acq_rel );
+ if ( !bCurrent )
+ CDS_TSAN_ANNOTATE_MUTEX_ACQUIRED( this );
+# else
+ bool bCurrent = m_spin.exchange( true, atomics::memory_order_acquire );
+# endif
CDS_DEBUG_ONLY(
if ( !bCurrent ) {
backoff_strategy backoff;
// Deadlock detected
+ CDS_TSAN_ANNOTATE_IGNORE_READS_BEGIN;
assert( m_dbgOwnerId != OS::get_current_thread_id());
+ CDS_TSAN_ANNOTATE_IGNORE_READS_END;
// TATAS algorithm
while ( !try_lock()) {
- while ( m_spin.load( atomics::memory_order_relaxed )) {
+ while ( m_spin.load( atomics::memory_order_acquire ))
backoff();
- }
}
+
assert( m_dbgOwnerId == OS::get_current_thread_id());
}
void unlock() CDS_NOEXCEPT
{
assert( m_spin.load( atomics::memory_order_relaxed ));
-
assert( m_dbgOwnerId == OS::get_current_thread_id());
CDS_DEBUG_ONLY( m_dbgOwnerId = OS::c_NullThreadId; )
+ CDS_TSAN_ANNOTATE_MUTEX_RELEASED( this );
m_spin.store( false, atomics::memory_order_release );
}
};
template <typename Integral, class Backoff>
class reentrant_spin_lock
{
- typedef OS::ThreadId thread_id ; ///< The type of thread id
+ typedef OS::ThreadId thread_id; ///< The type of thread id
public:
- typedef Integral integral_type ; ///< The integral type
- typedef Backoff backoff_strategy ; ///< The backoff type
+ typedef Integral integral_type; ///< The integral type
+ typedef Backoff backoff_strategy; ///< The backoff type
private:
- atomics::atomic<integral_type> m_spin ; ///< spin-lock atomic
- thread_id m_OwnerId ; ///< Owner thread id. If spin-lock is not locked it usually equals to \p OS::c_NullThreadId
+ //@cond
+ atomics::atomic<integral_type> m_spin; ///< spin-lock atomic
+ thread_id m_OwnerId; ///< Owner thread id. If spin-lock is not locked it usually equals to \p OS::c_NullThreadId
+ //@endcond
private:
//@cond
bool try_acquire() CDS_NOEXCEPT
{
integral_type nCurrent = 0;
- return m_spin.compare_exchange_weak( nCurrent, 1, atomics::memory_order_acquire, atomics::memory_order_acquire );
+ bool bRet = m_spin.compare_exchange_weak( nCurrent, 1, atomics::memory_order_acquire, atomics::memory_order_acquire );
+
+# ifdef CDS_THREAD_SANITIZER_ENABLED
+ if ( bRet )
+ CDS_TSAN_ANNOTATE_MUTEX_ACQUIRED( this );
+# endif
+
+ return bRet;
}
bool try_acquire( unsigned int nTryCount ) CDS_NOEXCEPT_( noexcept( backoff_strategy()()))
// TATAS algorithm
backoff_strategy bkoff;
while ( !try_acquire()) {
- while ( m_spin.load( atomics::memory_order_relaxed ))
+ while ( m_spin.load( atomics::memory_order_acquire ))
bkoff();
}
}
reentrant_spin_lock() CDS_NOEXCEPT
: m_spin(0)
, m_OwnerId( OS::c_NullThreadId )
- {}
+ {
+ CDS_TSAN_ANNOTATE_MUTEX_CREATE( this );
+ }
/// Dummy copy constructor
/**
reentrant_spin_lock( const reentrant_spin_lock<Integral, Backoff>& ) CDS_NOEXCEPT
: m_spin(0)
, m_OwnerId( OS::c_NullThreadId )
- {}
+ {
+ CDS_TSAN_ANNOTATE_MUTEX_CREATE( this );
+ }
/// Construct object in specified state
explicit reentrant_spin_lock( bool bLocked )
: m_spin(0)
, m_OwnerId( OS::c_NullThreadId )
{
+ CDS_TSAN_ANNOTATE_MUTEX_CREATE( this );
if ( bLocked )
lock();
}
+ /// Dtor. Spin-lock must be unlocked
+ ~reentrant_spin_lock()
+ {
+ assert( m_spin.load( atomics::memory_order_acquire ) == 0 );
+ assert( m_OwnerId == OS::c_NullThreadId );
+
+ CDS_TSAN_ANNOTATE_MUTEX_DESTROY( this );
+ }
+
/// Checks if the spin is locked
/**
The spin is locked if lock count > 0 and the current thread is not an owner of the lock.
return !( m_spin.load( atomics::memory_order_relaxed ) == 0 || is_taken( cds::OS::get_current_thread_id()));
}
- /// Try to lock the spin-lock (synonym for \p try_lock())
- bool try_lock() CDS_NOEXCEPT
+ /// Try to lock the spin-lock
+ bool try_lock() CDS_NOEXCEPT_( noexcept( std::declval<reentrant_spin_lock>().try_acquire()))
{
thread_id tid = OS::get_current_thread_id();
if ( try_taken_lock( tid ))
return false;
}
- /// Try to lock the object
+ /// Try to lock up to \p nTryCount attempts
bool try_lock( unsigned int nTryCount ) CDS_NOEXCEPT_( noexcept( std::declval<reentrant_spin_lock>().try_acquire( nTryCount )))
{
thread_id tid = OS::get_current_thread_id();
}
}
- /// Unlock the spin-lock. Return \p true if the current thread is owner of spin-lock \p false otherwise
- bool unlock() CDS_NOEXCEPT
+ /// Unlock the spin-lock
+ void unlock() CDS_NOEXCEPT
{
- if ( is_taken( OS::get_current_thread_id())) {
- integral_type n = m_spin.load( atomics::memory_order_relaxed );
- if ( n > 1 )
- m_spin.store( n - 1, atomics::memory_order_relaxed );
- else {
- free();
- m_spin.store( 0, atomics::memory_order_release );
- }
- return true;
+ assert( is_taken( OS::get_current_thread_id()));
+
+ integral_type n = m_spin.load( atomics::memory_order_relaxed );
+ if ( n > 1 )
+ m_spin.store( n - 1, atomics::memory_order_relaxed );
+ else {
+ free();
+ CDS_TSAN_ANNOTATE_MUTEX_RELEASED( this );
+ m_spin.store( 0, atomics::memory_order_release );
}
- return false;
}
- /// Change the owner of locked spin-lock. May be called by thread that is owner of the spin-lock
- bool change_owner( OS::ThreadId newOwnerId ) CDS_NOEXCEPT
+ /// Change the owner of locked spin-lock. May be called by thread that owns spin-lock
+ void change_owner( OS::ThreadId newOwnerId ) CDS_NOEXCEPT
{
- if ( is_taken( OS::get_current_thread_id())) {
- assert( newOwnerId != OS::c_NullThreadId );
- m_OwnerId = newOwnerId;
- return true;
- }
- return false;
+ assert( is_taken( OS::get_current_thread_id()));
+ assert( newOwnerId != OS::c_NullThreadId );
+
+ m_OwnerId = newOwnerId;
}
};
projects / libcds.git / blobdiff