151 lines
4.6 KiB
Text
151 lines
4.6 KiB
Text
/**
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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 mutexDebug.I
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* @author drose
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* @date 2006-02-13
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*/
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/**
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* Alias for acquire() to match C++11 semantics.
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* @see acquire()
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*/
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INLINE void MutexDebug::
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lock() {
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TAU_PROFILE("void MutexDebug::acquire()", " ", TAU_USER);
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_global_lock->lock();
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((MutexDebug *)this)->do_lock(Thread::get_current_thread());
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_global_lock->unlock();
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}
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/**
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* Alias for try_acquire() to match C++11 semantics.
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* @see try_acquire()
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*/
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INLINE bool MutexDebug::
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try_lock() {
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TAU_PROFILE("void MutexDebug::try_lock()", " ", TAU_USER);
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_global_lock->lock();
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bool acquired = ((MutexDebug *)this)->do_try_lock(Thread::get_current_thread());
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_global_lock->unlock();
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return acquired;
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}
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/**
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* Alias for release() to match C++11 semantics.
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* @see release()
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*/
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INLINE void MutexDebug::
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unlock() {
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TAU_PROFILE("void MutexDebug::unlock()", " ", TAU_USER);
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_global_lock->lock();
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((MutexDebug *)this)->do_unlock();
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_global_lock->unlock();
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}
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/**
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* Grabs the mutex if it is available. If it is not available, blocks until
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* it becomes available, then grabs it. In either case, the function does not
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* return until the mutex is held; you should then call unlock().
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*
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* This method is considered const so that you can lock and unlock const
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* mutexes, mainly to allow thread-safe access to otherwise const data.
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*
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* Also see MutexHolder.
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*/
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INLINE void MutexDebug::
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acquire(Thread *current_thread) const {
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TAU_PROFILE("void MutexDebug::acquire(Thread *)", " ", TAU_USER);
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nassertv(current_thread == Thread::get_current_thread());
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_global_lock->lock();
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((MutexDebug *)this)->do_lock(current_thread);
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_global_lock->unlock();
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}
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/**
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* Returns immediately, with a true value indicating the mutex has been
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* acquired, and false indicating it has not.
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*
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* @deprecated Python users should use acquire(False), C++ users try_lock()
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*/
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INLINE bool MutexDebug::
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try_acquire(Thread *current_thread) const {
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TAU_PROFILE("void MutexDebug::try_acquire(Thread *)", " ", TAU_USER);
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nassertr(current_thread == Thread::get_current_thread(), false);
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_global_lock->lock();
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bool acquired = ((MutexDebug *)this)->do_try_lock(current_thread);
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_global_lock->unlock();
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return acquired;
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}
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/**
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* This method increments the lock count, assuming the calling thread already
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* holds the lock. After this call, release() will need to be called one
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* additional time to release the lock.
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*
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* This method really performs the same function as acquire(), but it offers a
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* potential (slight) performance benefit when the calling thread knows that
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* it already holds the lock. It is an error to call this when the calling
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* thread does not hold the lock.
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*/
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INLINE void MutexDebug::
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elevate_lock() const {
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TAU_PROFILE("void MutexDebug::elevate_lock()", " ", TAU_USER);
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// You may only pass call elevate_lock() on a ReMutex--that is, to a mutex
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// whose _allow_recursion flag is true.
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nassertv(_allow_recursion);
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// Also, it's an error to call this if the lock is not already held.
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nassertv(debug_is_locked());
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acquire();
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}
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/**
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* Releases the mutex. It is an error to call this if the mutex was not
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* already locked.
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*
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* This method is considered const so that you can lock and unlock const
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* mutexes, mainly to allow thread-safe access to otherwise const data.
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*/
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INLINE void MutexDebug::
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release() const {
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TAU_PROFILE("void MutexDebug::release()", " ", TAU_USER);
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_global_lock->lock();
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((MutexDebug *)this)->do_unlock();
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_global_lock->unlock();
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}
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/**
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* Returns true if the current thread has locked the Mutex, false otherwise.
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* This method is only intended for use in debugging, hence the method name;
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* in the MutexDebug case, it always returns true, since there's not a
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* reliable way to determine this otherwise.
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*/
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INLINE bool MutexDebug::
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debug_is_locked() const {
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TAU_PROFILE("bool MutexDebug::debug_is_locked()", " ", TAU_USER);
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_global_lock->lock();
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bool is_locked = do_debug_is_locked();
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_global_lock->unlock();
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return is_locked;
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}
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/**
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* Ensures the global MutexImpl pointer has been created, and returns its
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* pointer. Since this method is called by the MutexDebug constructor, any
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* other (non-static) methods of MutexDebug may simply assume that the pointer
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* has already been created.
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*/
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INLINE MutexTrueImpl *MutexDebug::
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get_global_lock() {
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if (_global_lock == nullptr) {
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_global_lock = new MutexTrueImpl;
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}
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return _global_lock;
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}
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