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809f9b04f6
This reimplements the spinlock on top of std::atomic_flag, which is guaranteed to be lockless. It also inserts the PAUSE (REP NOP) instruction which is strongly recommended to be placed in busy-wait loops by Intel. This also includes a recursive spinlock implementation. The spinlock implementation is disabled by default, but can be enabled by adding the --override MUTEX_SPINLOCK=1 flag to makepanda.
94 lines
2.2 KiB
C++
94 lines
2.2 KiB
C++
/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file reMutexDirect.h
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* @author drose
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* @date 2006-02-13
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*/
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#ifndef REMUTEXDIRECT_H
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#define REMUTEXDIRECT_H
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#include "pandabase.h"
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#include "mutexTrueImpl.h"
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#include "conditionVarImpl.h"
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class Thread;
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#ifndef DEBUG_THREADS
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/**
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* This class implements a standard reMutex by making direct calls to the
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* underlying implementation layer. It doesn't perform any debugging
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* operations.
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*/
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class EXPCL_PANDA_PIPELINE ReMutexDirect {
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protected:
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INLINE ReMutexDirect();
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ReMutexDirect(const ReMutexDirect ©) = delete;
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~ReMutexDirect() = default;
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void operator = (const ReMutexDirect ©) = delete;
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public:
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INLINE void lock();
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INLINE bool try_lock();
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INLINE void unlock();
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PUBLISHED:
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BLOCKING INLINE void acquire() const;
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BLOCKING INLINE void acquire(Thread *current_thread) const;
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BLOCKING INLINE bool try_acquire() const;
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BLOCKING INLINE bool try_acquire(Thread *current_thread) const;
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INLINE void elevate_lock() const;
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INLINE void release() const;
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INLINE bool debug_is_locked() const;
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INLINE void set_name(const std::string &name);
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INLINE void clear_name();
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INLINE bool has_name() const;
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INLINE std::string get_name() const;
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void output(std::ostream &out) const;
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private:
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#ifdef HAVE_REMUTEXTRUEIMPL
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mutable ReMutexTrueImpl _impl;
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#else
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// If we don't have a reentrant mutex, we have to hand-roll one.
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INLINE void do_lock();
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void do_lock(Thread *current_thread);
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INLINE bool do_try_lock();
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bool do_try_lock(Thread *current_thread);
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void do_elevate_lock();
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void do_unlock(Thread *current_thread = Thread::get_current_thread());
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Thread *_locking_thread;
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int _lock_count;
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MutexTrueImpl _lock_impl;
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ConditionVarImpl _cvar_impl;
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#endif // HAVE_REMUTEXTRUEIMPL
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friend class LightReMutexDirect;
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};
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INLINE std::ostream &
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operator << (std::ostream &out, const ReMutexDirect &m) {
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m.output(out);
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return out;
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}
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#include "reMutexDirect.I"
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#endif // !DEBUG_THREADS
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#endif
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