DISTRHO
/
Cardinal
mirror of https://github.com/DISTRHO/Cardinal.git
1
0
Fork 0
Code Issues 0 Releases 18 Wiki Activity
Browse Source

Import water code for SharedResourcePointer, use it for init

tags/22.02
falkTX 3 years ago
parent
05df01ef3a
commit
74206ec01a
6 changed files with 1264 additions and 30 deletions
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. +29
    -30
      src/CardinalPlugin.cpp
  2. +281
    -0
      src/extra/Atomic.hpp
  3. +417
    -0
      src/extra/ReferenceCountedObject.hpp
  4. +238
    -0
      src/extra/ScopedLock.hpp
  5. +189
    -0
      src/extra/SharedResourcePointer.hpp
  6. +110
    -0
      src/extra/SpinLock.hpp

+ 29
- 30
src/CardinalPlugin.cpp View File

@@ -34,6 +34,7 @@
#include "PluginContext.hpp"
#include "WindowParameters.hpp"
#include "extra/Base64.hpp"
#include "extra/SharedResourcePointer.hpp"
namespace rack {
namespace plugin {
@@ -47,7 +48,7 @@ START_NAMESPACE_DISTRHO
// -----------------------------------------------------------------------------------------------------------
struct Initializer {
Initializer()
Initializer(const CardinalBasePlugin* const plugin)
{
using namespace rack;
@@ -60,10 +61,12 @@ struct Initializer {
settings::skipLoadOnLaunch = true;
settings::showTipsOnLaunch = false;
settings::threadCount = 1;
system::init();
asset::init();
logger::init();
random::init();
ui::init();
// Make system dir point to source code location. It is good enough for now
asset::systemDir = CARDINAL_PLUGIN_SOURCE_DIR DISTRHO_OS_SEP_STR "Rack";
@@ -73,7 +76,6 @@ struct Initializer {
INFO("%s", system::getOperatingSystemInfo().c_str());
INFO("System directory: %s", asset::systemDir.c_str());
INFO("User directory: %s", asset::userDir.c_str());
INFO("System time: %s", string::formatTimeISO(system::getUnixTime()).c_str());
// Check existence of the system res/ directory
const std::string resDir = asset::system("res");
@@ -83,42 +85,54 @@ struct Initializer {
"Make sure Cardinal was downloaded and installed correctly.", resDir.c_str());
}
INFO("Initializing environment");
audio::init(); // does nothing
midi::init(); // does nothing
INFO("Initializing audio driver");
rack::audio::addDriver(0, new CardinalAudioDriver);
INFO("Initializing plugins");
plugin::initStaticPlugins();
ui::init();
}
~Initializer()
{
using namespace rack;
ui::destroy(); // does nothing
INFO("Destroying plugins");
plugin::destroyStaticPlugins();
INFO("Destroying MIDI devices");
midi::destroy();
INFO("Destroying audio devices");
audio::destroy();
INFO("Destroying logger");
logger::destroy();
}
};
static const Initializer& getInitializerInstance()
{
static const Initializer init;
return init;
}
// -----------------------------------------------------------------------------------------------------------
struct ScopedContext {
const MutexLocker cml;
ScopedContext(const CardinalBasePlugin* const plugin)
: cml(plugin->context->mutex)
{
rack::contextSet(plugin->context);
}
~ScopedContext()
{
rack::contextSet(nullptr);
}
};
// -----------------------------------------------------------------------------------------------------------
class CardinalPlugin : public CardinalBasePlugin
{
SharedResourcePointer<Initializer> fInitializer;
float* fAudioBufferIn;
float* fAudioBufferOut;
std::string fAutosavePath;
@@ -130,24 +144,10 @@ class CardinalPlugin : public CardinalBasePlugin
float fWindowParameters[kWindowParameterCount];
struct ScopedContext {
const MutexLocker cml;
ScopedContext(const CardinalPlugin* const plugin)
: cml(plugin->context->mutex)
{
rack::contextSet(plugin->context);
}
~ScopedContext()
{
rack::contextSet(nullptr);
}
};
public:
CardinalPlugin()
: CardinalBasePlugin(kModuleParameters + kWindowParameterCount, 0, 1),
fInitializer(this),
fAudioBufferIn(nullptr),
fAudioBufferOut(nullptr),
fIsActive(false),
@@ -517,7 +517,6 @@ CardinalPluginContext* getRackContextFromPlugin(void* const ptr)
Plugin* createPlugin()
{
getInitializerInstance();
return new CardinalPlugin();
}


+ 281
- 0
src/extra/Atomic.hpp View File

@@ -0,0 +1,281 @@
/*
==============================================================================
This file is part of the Water library.
Copyright (c) 2016 ROLI Ltd.
Copyright (C) 2017 Filipe Coelho <falktx@falktx.com>
Permission is granted to use this software under the terms of the ISC license
http://www.isc.org/downloads/software-support-policy/isc-license/
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH REGARD
TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT,
OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
OF THIS SOFTWARE.
==============================================================================
*/
#ifndef WATER_ATOMIC_HPP_INCLUDED
#define WATER_ATOMIC_HPP_INCLUDED
#include "DistrhoUtils.hpp"
START_NAMESPACE_DISTRHO
//==============================================================================
/**
Simple class to hold a primitive value and perform atomic operations on it.
The type used must be a 32 or 64 bit primitive, like an int, pointer, etc.
There are methods to perform most of the basic atomic operations.
*/
template <typename Type>
class Atomic
{
public:
/** Creates a new value, initialised to zero. */
inline Atomic() noexcept
: value (0)
{
}
/** Creates a new value, with a given initial value. */
inline explicit Atomic (const Type initialValue) noexcept
: value (initialValue)
{
}
/** Copies another value (atomically). */
inline Atomic (const Atomic& other) noexcept
: value (other.get())
{
}
/** Destructor. */
inline ~Atomic() noexcept
{
#ifdef DISTRHO_PROPER_CPP11_SUPPORT
// This class can only be used for types which are 32 or 64 bits in size.
static_assert (sizeof (Type) == 4 || sizeof (Type) == 8, "Only for 32 or 64 bits");
#endif
}
/** Atomically reads and returns the current value. */
Type get() const noexcept;
/** Copies another value onto this one (atomically). */
inline Atomic& operator= (const Atomic& other) noexcept { exchange (other.get()); return *this; }
/** Copies another value onto this one (atomically). */
inline Atomic& operator= (const Type newValue) noexcept { exchange (newValue); return *this; }
/** Atomically sets the current value. */
void set (Type newValue) noexcept { exchange (newValue); }
/** Atomically sets the current value, returning the value that was replaced. */
Type exchange (Type value) noexcept;
/** Atomically adds a number to this value, returning the new value. */
Type operator+= (Type amountToAdd) noexcept;
/** Atomically subtracts a number from this value, returning the new value. */
Type operator-= (Type amountToSubtract) noexcept;
/** Atomically increments this value, returning the new value. */
Type operator++() noexcept;
/** Atomically decrements this value, returning the new value. */
Type operator--() noexcept;
/** Atomically compares this value with a target value, and if it is equal, sets
this to be equal to a new value.
This operation is the atomic equivalent of doing this:
@code
bool compareAndSetBool (Type newValue, Type valueToCompare)
{
if (get() == valueToCompare)
{
set (newValue);
return true;
}
return false;
}
@endcode
@returns true if the comparison was true and the value was replaced; false if
the comparison failed and the value was left unchanged.
@see compareAndSetValue
*/
bool compareAndSetBool (Type newValue, Type valueToCompare) noexcept;
/** Atomically compares this value with a target value, and if it is equal, sets
this to be equal to a new value.
This operation is the atomic equivalent of doing this:
@code
Type compareAndSetValue (Type newValue, Type valueToCompare)
{
Type oldValue = get();
if (oldValue == valueToCompare)
set (newValue);
return oldValue;
}
@endcode
@returns the old value before it was changed.
@see compareAndSetBool
*/
Type compareAndSetValue (Type newValue, Type valueToCompare) noexcept;
/** Implements a memory read/write barrier. */
static void memoryBarrier() noexcept;
//==============================================================================
/** The raw value that this class operates on.
This is exposed publicly in case you need to manipulate it directly
for performance reasons.
*/
#if defined(__LP64__) || defined(_LP64) || defined(__arm64__) || defined(__aarch64__) || defined(WIN64) || defined(_WIN64) || defined(__WIN64__) || defined(_M_ARM64)
__attribute__ ((aligned (8)))
#else
__attribute__ ((aligned (4)))
#endif
volatile Type value;
private:
template <typename Dest, typename Source>
static inline Dest castTo (Source value) noexcept { union { Dest d; Source s; } u; u.s = value; return u.d; }
static inline Type castFrom32Bit (int32_t value) noexcept { return castTo <Type, int32_t> (value); }
static inline Type castFrom64Bit (int64_t value) noexcept { return castTo <Type, int64_t> (value); }
static inline Type castFrom32Bit (uint32_t value) noexcept { return castTo <Type, uint32_t> (value); }
static inline Type castFrom64Bit (uint64_t value) noexcept { return castTo <Type, uint64_t> (value); }
static inline int32_t castTo32Bit (Type value) noexcept { return castTo <int32_t, Type> (value); }
static inline int64_t castTo64Bit (Type value) noexcept { return castTo <int64_t, Type> (value); }
Type operator++ (int); // better to just use pre-increment with atomics..
Type operator-- (int);
/** This templated negate function will negate pointers as well as integers */
template <typename ValueType>
inline ValueType negateValue (ValueType n) noexcept
{
return sizeof (ValueType) == 1 ? (ValueType) -(signed char) n
: (sizeof (ValueType) == 2 ? (ValueType) -(short) n
: (sizeof (ValueType) == 4 ? (ValueType) -(int) n
: ((ValueType) -(int64_t) n)));
}
/** This templated negate function will negate pointers as well as integers */
template <typename PointerType>
inline PointerType* negateValue (PointerType* n) noexcept
{
return reinterpret_cast<PointerType*> (-reinterpret_cast<intptr_t> (n));
}
};
//==============================================================================
template<>
inline int32_t Atomic<int32_t>::get() const noexcept
{
#ifdef DISTRHO_PROPER_CPP11_SUPPORT
static_assert (sizeof (int32_t) == 4, "int32_t must be size 4");
#endif
return castFrom32Bit ((int32_t) __sync_add_and_fetch (const_cast<volatile int32_t*>(&value), 0));
}
template<>
inline int64_t Atomic<int64_t>::get() const noexcept
{
#ifdef DISTRHO_PROPER_CPP11_SUPPORT
static_assert (sizeof (int64_t) == 8, "int64_t must be size 8");
#endif
return castFrom64Bit ((int64_t) __sync_add_and_fetch (const_cast<volatile int64_t*>(&value), 0));
}
template<>
inline uint32_t Atomic<uint32_t>::get() const noexcept
{
#ifdef DISTRHO_PROPER_CPP11_SUPPORT
static_assert (sizeof (uint32_t) == 4, "uint32_t must be size 4");
#endif
return castFrom32Bit ((uint32_t) __sync_add_and_fetch (const_cast<volatile uint32_t*>(&value), 0));
}
template<>
inline uint64_t Atomic<uint64_t>::get() const noexcept
{
#ifdef DISTRHO_PROPER_CPP11_SUPPORT
static_assert (sizeof (uint64_t) == 8, "uint64_t must be size 8");
#endif
return castFrom64Bit ((uint64_t) __sync_add_and_fetch (const_cast<volatile uint64_t*>(&value), 0));
}
template <typename Type>
inline Type Atomic<Type>::exchange (const Type newValue) noexcept
{
Type currentVal = value;
while (! compareAndSetBool (newValue, currentVal)) { currentVal = value; }
return currentVal;
}
template <typename Type>
inline Type Atomic<Type>::operator+= (const Type amountToAdd) noexcept
{
return (Type) __sync_add_and_fetch (&value, amountToAdd);
}
template <typename Type>
inline Type Atomic<Type>::operator-= (const Type amountToSubtract) noexcept
{
return operator+= (negateValue (amountToSubtract));
}
template <typename Type>
inline Type Atomic<Type>::operator++() noexcept
{
return sizeof (Type) == 4 ? (Type) __sync_add_and_fetch (&value, (Type) 1)
: (Type) __sync_add_and_fetch ((volatile int64_t*) &value, 1);
}
template <typename Type>
inline Type Atomic<Type>::operator--() noexcept
{
return sizeof (Type) == 4 ? (Type) __sync_add_and_fetch (&value, (Type) -1)
: (Type) __sync_add_and_fetch ((volatile int64_t*) &value, -1);
}
template <typename Type>
inline bool Atomic<Type>::compareAndSetBool (const Type newValue, const Type valueToCompare) noexcept
{
return sizeof (Type) == 4 ? __sync_bool_compare_and_swap ((volatile int32_t*) &value, castTo32Bit (valueToCompare), castTo32Bit (newValue))
: __sync_bool_compare_and_swap ((volatile int64_t*) &value, castTo64Bit (valueToCompare), castTo64Bit (newValue));
}
template <typename Type>
inline Type Atomic<Type>::compareAndSetValue (const Type newValue, const Type valueToCompare) noexcept
{
return sizeof (Type) == 4 ? castFrom32Bit ((int32_t) __sync_val_compare_and_swap ((volatile int32_t*) &value, castTo32Bit (valueToCompare), castTo32Bit (newValue)))
: castFrom64Bit ((int64_t) __sync_val_compare_and_swap ((volatile int64_t*) &value, castTo64Bit (valueToCompare), castTo64Bit (newValue)));
}
template <typename Type>
inline void Atomic<Type>::memoryBarrier() noexcept
{
__sync_synchronize();
}
END_NAMESPACE_DISTRHO
#endif // WATER_ATOMIC_HPP_INCLUDED

+ 417
- 0
src/extra/ReferenceCountedObject.hpp View File

@@ -0,0 +1,417 @@
/*
==============================================================================
This file is part of the Water library.
Copyright (c) 2016 ROLI Ltd.
Copyright (C) 2017 Filipe Coelho <falktx@falktx.com>
Permission is granted to use this software under the terms of the ISC license
http://www.isc.org/downloads/software-support-policy/isc-license/
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH REGARD
TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT,
OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
OF THIS SOFTWARE.
==============================================================================
*/
#ifndef WATER_REFERENCECOUNTEDOBJECT_HPP_INCLUDED
#define WATER_REFERENCECOUNTEDOBJECT_HPP_INCLUDED
#include "Atomic.hpp"
START_NAMESPACE_DISTRHO
//==============================================================================
/**
A base class which provides methods for reference-counting.
To add reference-counting to a class, derive it from this class, and
use the ReferenceCountedObjectPtr class to point to it.
e.g. @code
class MyClass : public ReferenceCountedObject
{
void foo();
// This is a neat way of declaring a typedef for a pointer class,
// rather than typing out the full templated name each time..
typedef ReferenceCountedObjectPtr<MyClass> Ptr;
};
MyClass::Ptr p = new MyClass();
MyClass::Ptr p2 = p;
p = nullptr;
p2->foo();
@endcode
Once a new ReferenceCountedObject has been assigned to a pointer, be
careful not to delete the object manually.
This class uses an Atomic<int> value to hold the reference count, so that it
the pointers can be passed between threads safely. For a faster but non-thread-safe
version, use SingleThreadedReferenceCountedObject instead.
@see ReferenceCountedObjectPtr, ReferenceCountedArray, SingleThreadedReferenceCountedObject
*/
class ReferenceCountedObject
{
public:
//==============================================================================
/** Increments the object's reference count.
This is done automatically by the smart pointer, but is public just
in case it's needed for nefarious purposes.
*/
void incReferenceCount() noexcept
{
++refCount;
}
/** Decreases the object's reference count.
If the count gets to zero, the object will be deleted.
*/
void decReferenceCount() noexcept
{
DISTRHO_SAFE_ASSERT_RETURN (getReferenceCount() > 0,);
if (--refCount == 0)
delete this;
}
/** Decreases the object's reference count.
If the count gets to zero, the object will not be deleted, but this method
will return true, allowing the caller to take care of deletion.
*/
bool decReferenceCountWithoutDeleting() noexcept
{
DISTRHO_SAFE_ASSERT_RETURN (getReferenceCount() > 0, false);
return --refCount == 0;
}
/** Returns the object's current reference count. */
int getReferenceCount() const noexcept { return refCount.get(); }
protected:
//==============================================================================
/** Creates the reference-counted object (with an initial ref count of zero). */
ReferenceCountedObject()
: refCount() {}
/** Destructor. */
virtual ~ReferenceCountedObject()
{
// it's dangerous to delete an object that's still referenced by something else!
DISTRHO_SAFE_ASSERT (getReferenceCount() == 0);
}
/** Resets the reference count to zero without deleting the object.
You should probably never need to use this!
*/
void resetReferenceCount() noexcept
{
refCount = 0;
}
private:
//==============================================================================
Atomic<int> refCount;
DISTRHO_DECLARE_NON_COPYABLE (ReferenceCountedObject)
};
//==============================================================================
/**
Adds reference-counting to an object.
This is effectively a version of the ReferenceCountedObject class, but which
uses a non-atomic counter, and so is not thread-safe (but which will be more
efficient).
For more details on how to use it, see the ReferenceCountedObject class notes.
@see ReferenceCountedObject, ReferenceCountedObjectPtr, ReferenceCountedArray
*/
class SingleThreadedReferenceCountedObject
{
public:
//==============================================================================
/** Increments the object's reference count.
This is done automatically by the smart pointer, but is public just
in case it's needed for nefarious purposes.
*/
void incReferenceCount() noexcept
{
++refCount;
}
/** Decreases the object's reference count.
If the count gets to zero, the object will be deleted.
*/
void decReferenceCount() noexcept
{
DISTRHO_SAFE_ASSERT_RETURN (getReferenceCount() > 0,);
if (--refCount == 0)
delete this;
}
/** Decreases the object's reference count.
If the count gets to zero, the object will not be deleted, but this method
will return true, allowing the caller to take care of deletion.
*/
bool decReferenceCountWithoutDeleting() noexcept
{
DISTRHO_SAFE_ASSERT_RETURN (getReferenceCount() > 0, false);
return --refCount == 0;
}
/** Returns the object's current reference count. */
int getReferenceCount() const noexcept { return refCount; }
protected:
//==============================================================================
/** Creates the reference-counted object (with an initial ref count of zero). */
SingleThreadedReferenceCountedObject() : refCount (0) {}
/** Destructor. */
virtual ~SingleThreadedReferenceCountedObject()
{
// it's dangerous to delete an object that's still referenced by something else!
DISTRHO_SAFE_ASSERT_RETURN (getReferenceCount() == 0,);
}
private:
//==============================================================================
int refCount;
DISTRHO_DECLARE_NON_COPYABLE (SingleThreadedReferenceCountedObject)
};
//==============================================================================
/**
A smart-pointer class which points to a reference-counted object.
The template parameter specifies the class of the object you want to point to - the easiest
way to make a class reference-countable is to simply make it inherit from ReferenceCountedObject
or SingleThreadedReferenceCountedObject, but if you need to, you can roll your own reference-countable
class by implementing a set of methods called incReferenceCount(), decReferenceCount(), and
decReferenceCountWithoutDeleting(). See ReferenceCountedObject for examples of how these methods
should behave.
When using this class, you'll probably want to create a typedef to abbreviate the full
templated name - e.g.
@code
struct MyClass : public ReferenceCountedObject
{
typedef ReferenceCountedObjectPtr<MyClass> Ptr;
...
@endcode
@see ReferenceCountedObject, ReferenceCountedObjectArray
*/
template <class ReferenceCountedObjectClass>
class ReferenceCountedObjectPtr
{
public:
/** The class being referenced by this pointer. */
typedef ReferenceCountedObjectClass ReferencedType;
//==============================================================================
/** Creates a pointer to a null object. */
ReferenceCountedObjectPtr() noexcept
: referencedObject (nullptr)
{
}
/** Creates a pointer to an object.
This will increment the object's reference-count.
*/
ReferenceCountedObjectPtr (ReferencedType* refCountedObject) noexcept
: referencedObject (refCountedObject)
{
incIfNotNull (refCountedObject);
}
/** Copies another pointer.
This will increment the object's reference-count.
*/
ReferenceCountedObjectPtr (const ReferenceCountedObjectPtr& other) noexcept
: referencedObject (other.referencedObject)
{
incIfNotNull (referencedObject);
}
/** Copies another pointer.
This will increment the object's reference-count (if it is non-null).
*/
template <typename Convertible>
ReferenceCountedObjectPtr (const ReferenceCountedObjectPtr<Convertible>& other) noexcept
: referencedObject (static_cast<ReferencedType*> (other.get()))
{
incIfNotNull (referencedObject);
}
/** Changes this pointer to point at a different object.
The reference count of the old object is decremented, and it might be
deleted if it hits zero. The new object's count is incremented.
*/
ReferenceCountedObjectPtr& operator= (const ReferenceCountedObjectPtr& other)
{
return operator= (other.referencedObject);
}
/** Changes this pointer to point at a different object.
The reference count of the old object is decremented, and it might be
deleted if it hits zero. The new object's count is incremented.
*/
template <typename Convertible>
ReferenceCountedObjectPtr& operator= (const ReferenceCountedObjectPtr<Convertible>& other)
{
return operator= (static_cast<ReferencedType*> (other.get()));
}
/** Changes this pointer to point at a different object.
The reference count of the old object is decremented, and it might be
deleted if it hits zero. The new object's count is incremented.
*/
ReferenceCountedObjectPtr& operator= (ReferencedType* const newObject)
{
if (referencedObject != newObject)
{
incIfNotNull (newObject);
ReferencedType* const oldObject = referencedObject;
referencedObject = newObject;
decIfNotNull (oldObject);
}
return *this;
}
#if WATER_COMPILER_SUPPORTS_MOVE_SEMANTICS
/** Takes-over the object from another pointer. */
ReferenceCountedObjectPtr (ReferenceCountedObjectPtr&& other) noexcept
: referencedObject (other.referencedObject)
{
other.referencedObject = nullptr;
}
/** Takes-over the object from another pointer. */
ReferenceCountedObjectPtr& operator= (ReferenceCountedObjectPtr&& other)
{
std::swap (referencedObject, other.referencedObject);
return *this;
}
#endif
/** Destructor.
This will decrement the object's reference-count, which will cause the
object to be deleted when the ref-count hits zero.
*/
~ReferenceCountedObjectPtr()
{
ReferencedType* const oldObject = referencedObject; // need to null the pointer before deleting the object
referencedObject = nullptr; // in case this ptr is itself deleted as a side-effect
decIfNotNull (oldObject); // of the destructor
}
//==============================================================================
/** Returns the object that this pointer references.
The pointer returned may be null, of course.
*/
operator ReferencedType*() const noexcept { return referencedObject; }
/** Returns the object that this pointer references.
The pointer returned may be null, of course.
*/
ReferencedType* get() const noexcept { return referencedObject; }
/** Returns the object that this pointer references.
The pointer returned may be null, of course.
*/
ReferencedType* getObject() const noexcept { return referencedObject; }
// the -> operator is called on the referenced object
ReferencedType* operator->() const noexcept
{
DISTRHO_SAFE_ASSERT (referencedObject != nullptr); // null pointer method call!
return referencedObject;
}
private:
//==============================================================================
ReferencedType* referencedObject;
static void incIfNotNull (ReferencedType* o) noexcept
{
if (o != nullptr)
o->incReferenceCount();
}
static void decIfNotNull (ReferencedType* o) noexcept
{
if (o != nullptr && o->decReferenceCountWithoutDeleting())
delete o;
}
};
//==============================================================================
/** Compares two ReferenceCountedObjectPtrs. */
template <typename ReferenceCountedObjectClass>
bool operator== (const ReferenceCountedObjectPtr<ReferenceCountedObjectClass>& object1, ReferenceCountedObjectClass* const object2) noexcept
{
return object1.get() == object2;
}
/** Compares two ReferenceCountedObjectPtrs. */
template <typename ReferenceCountedObjectClass>
bool operator== (const ReferenceCountedObjectPtr<ReferenceCountedObjectClass>& object1, const ReferenceCountedObjectPtr<ReferenceCountedObjectClass>& object2) noexcept
{
return object1.get() == object2.get();
}
/** Compares two ReferenceCountedObjectPtrs. */
template <typename ReferenceCountedObjectClass>
bool operator== (ReferenceCountedObjectClass* object1, const ReferenceCountedObjectPtr<ReferenceCountedObjectClass>& object2) noexcept
{
return object1 == object2.get();
}
/** Compares two ReferenceCountedObjectPtrs. */
template <typename ReferenceCountedObjectClass>
bool operator!= (const ReferenceCountedObjectPtr<ReferenceCountedObjectClass>& object1, const ReferenceCountedObjectClass* object2) noexcept
{
return object1.get() != object2;
}
/** Compares two ReferenceCountedObjectPtrs. */
template <typename ReferenceCountedObjectClass>
bool operator!= (const ReferenceCountedObjectPtr<ReferenceCountedObjectClass>& object1, const ReferenceCountedObjectPtr<ReferenceCountedObjectClass>& object2) noexcept
{
return object1.get() != object2.get();
}
/** Compares two ReferenceCountedObjectPtrs. */
template <typename ReferenceCountedObjectClass>
bool operator!= (ReferenceCountedObjectClass* object1, const ReferenceCountedObjectPtr<ReferenceCountedObjectClass>& object2) noexcept
{
return object1 != object2.get();
}
}
#endif // WATER_REFERENCECOUNTEDOBJECT_HPP_INCLUDED

+ 238
- 0
src/extra/ScopedLock.hpp View File

@@ -0,0 +1,238 @@
/*
==============================================================================
This file is part of the Water library.
Copyright (c) 2016 ROLI Ltd.
Copyright (C) 2017 Filipe Coelho <falktx@falktx.com>
Permission is granted to use this software under the terms of the ISC license
http://www.isc.org/downloads/software-support-policy/isc-license/
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH REGARD
TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT,
OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
OF THIS SOFTWARE.
==============================================================================
*/
#ifndef WATER_SCOPEDLOCK_HPP_INCLUDED
#define WATER_SCOPEDLOCK_HPP_INCLUDED
#include "DistrhoUtils.hpp"
START_NAMESPACE_DISTRHO
//==============================================================================
/**
Automatically locks and unlocks a mutex object.
Use one of these as a local variable to provide RAII-based locking of a mutex.
The templated class could be a CriticalSection, SpinLock, or anything else that
provides enter() and exit() methods.
e.g. @code
CriticalSection myCriticalSection;
for (;;)
{
const GenericScopedLock<CriticalSection> myScopedLock (myCriticalSection);
// myCriticalSection is now locked
...do some stuff...
// myCriticalSection gets unlocked here.
}
@endcode
@see GenericScopedUnlock, CriticalSection, SpinLock, ScopedLock, ScopedUnlock
*/
template <class LockType>
class GenericScopedLock
{
public:
//==============================================================================
/** Creates a GenericScopedLock.
As soon as it is created, this will acquire the lock, and when the GenericScopedLock
object is deleted, the lock will be released.
Make sure this object is created and deleted by the same thread,
otherwise there are no guarantees what will happen! Best just to use it
as a local stack object, rather than creating one with the new() operator.
*/
inline explicit GenericScopedLock (const LockType& lock) noexcept : lock_ (lock) { lock.enter(); }
/** Destructor.
The lock will be released when the destructor is called.
Make sure this object is created and deleted by the same thread, otherwise there are
no guarantees what will happen!
*/
inline ~GenericScopedLock() noexcept { lock_.exit(); }
private:
//==============================================================================
const LockType& lock_;
DISTRHO_DECLARE_NON_COPYABLE (GenericScopedLock)
};
//==============================================================================
/**
Automatically unlocks and re-locks a mutex object.
This is the reverse of a GenericScopedLock object - instead of locking the mutex
for the lifetime of this object, it unlocks it.
Make sure you don't try to unlock mutexes that aren't actually locked!
e.g. @code
CriticalSection myCriticalSection;
for (;;)
{
const GenericScopedLock<CriticalSection> myScopedLock (myCriticalSection);
// myCriticalSection is now locked
... do some stuff with it locked ..
while (xyz)
{
... do some stuff with it locked ..
const GenericScopedUnlock<CriticalSection> unlocker (myCriticalSection);
// myCriticalSection is now unlocked for the remainder of this block,
// and re-locked at the end.
...do some stuff with it unlocked ...
}
// myCriticalSection gets unlocked here.
}
@endcode
@see GenericScopedLock, CriticalSection, ScopedLock, ScopedUnlock
*/
template <class LockType>
class GenericScopedUnlock
{
public:
//==============================================================================
/** Creates a GenericScopedUnlock.
As soon as it is created, this will unlock the CriticalSection, and
when the ScopedLock object is deleted, the CriticalSection will
be re-locked.
Make sure this object is created and deleted by the same thread,
otherwise there are no guarantees what will happen! Best just to use it
as a local stack object, rather than creating one with the new() operator.
*/
inline explicit GenericScopedUnlock (const LockType& lock) noexcept : lock_ (lock) { lock.exit(); }
/** Destructor.
The CriticalSection will be unlocked when the destructor is called.
Make sure this object is created and deleted by the same thread,
otherwise there are no guarantees what will happen!
*/
inline ~GenericScopedUnlock() noexcept { lock_.enter(); }
private:
//==============================================================================
const LockType& lock_;
DISTRHO_DECLARE_NON_COPYABLE (GenericScopedUnlock)
};
//==============================================================================
/**
Automatically locks and unlocks a mutex object.
Use one of these as a local variable to provide RAII-based locking of a mutex.
The templated class could be a CriticalSection, SpinLock, or anything else that
provides enter() and exit() methods.
e.g. @code
CriticalSection myCriticalSection;
for (;;)
{
const GenericScopedTryLock<CriticalSection> myScopedTryLock (myCriticalSection);
// Unlike using a ScopedLock, this may fail to actually get the lock, so you
// should test this with the isLocked() method before doing your thread-unsafe
// action..
if (myScopedTryLock.isLocked())
{
...do some stuff...
}
else
{
..our attempt at locking failed because another thread had already locked it..
}
// myCriticalSection gets unlocked here (if it was locked)
}
@endcode
@see CriticalSection::tryEnter, GenericScopedLock, GenericScopedUnlock
*/
template <class LockType>
class GenericScopedTryLock
{
public:
//==============================================================================
/** Creates a GenericScopedTryLock.
As soon as it is created, this will attempt to acquire the lock, and when the
GenericScopedTryLock is deleted, the lock will be released (if the lock was
successfully acquired).
Make sure this object is created and deleted by the same thread,
otherwise there are no guarantees what will happen! Best just to use it
as a local stack object, rather than creating one with the new() operator.
*/
inline explicit GenericScopedTryLock (const LockType& lock) noexcept
: lock_ (lock), lockWasSuccessful (lock.tryEnter()) {}
/** Destructor.
The mutex will be unlocked (if it had been successfully locked) when the
destructor is called.
Make sure this object is created and deleted by the same thread,
otherwise there are no guarantees what will happen!
*/
inline ~GenericScopedTryLock() noexcept { if (lockWasSuccessful) lock_.exit(); }
/** Returns true if the mutex was successfully locked. */
bool isLocked() const noexcept { return lockWasSuccessful; }
private:
//==============================================================================
const LockType& lock_;
const bool lockWasSuccessful;
DISTRHO_DECLARE_NON_COPYABLE (GenericScopedTryLock)
};
END_NAMESPACE_DISTRHO
#endif // WATER_SCOPEDLOCK_HPP_INCLUDED

+ 189
- 0
src/extra/SharedResourcePointer.hpp View File

@@ -0,0 +1,189 @@
/*
==============================================================================
This file is part of the Water library.
Copyright (c) 2016 ROLI Ltd.
Copyright (C) 2017-2019 Filipe Coelho <falktx@falktx.com>
Permission is granted to use this software under the terms of the ISC license
http://www.isc.org/downloads/software-support-policy/isc-license/
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH REGARD
TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT,
OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
OF THIS SOFTWARE.
==============================================================================
*/
#ifndef WATER_SHAREDRESOURCEPOINTER_HPP_INCLUDED
#define WATER_SHAREDRESOURCEPOINTER_HPP_INCLUDED
#include "ReferenceCountedObject.hpp"
#include "SpinLock.hpp"
#include "extra/ScopedPointer.hpp"
START_NAMESPACE_DISTRHO
//==============================================================================
/**
A smart-pointer that automatically creates and manages the lifetime of a
shared static instance of a class.
The SharedObjectType template type indicates the class to use for the shared
object - the only requirements on this class are that it must have a public
default constructor and destructor.
The SharedResourcePointer offers a pattern that differs from using a singleton or
static instance of an object, because it uses reference-counting to make sure that
the underlying shared object is automatically created/destroyed according to the
number of SharedResourcePointer objects that exist. When the last one is deleted,
the underlying object is also immediately destroyed. This allows you to use scoping
to manage the lifetime of a shared resource.
Note: the construction/deletion of the shared object must not involve any
code that makes recursive calls to a SharedResourcePointer, or you'll cause
a deadlock.
Example:
@code
// An example of a class that contains the shared data you want to use.
struct MySharedData
{
// There's no need to ever create an instance of this class directly yourself,
// but it does need a public constructor that does the initialisation.
MySharedData()
{
sharedStuff = generateHeavyweightStuff();
}
Array<SomeKindOfData> sharedStuff;
};
struct DataUserClass
{
DataUserClass()
{
// Multiple instances of the DataUserClass will all have the same
// shared common instance of MySharedData referenced by their sharedData
// member variables.
useSharedStuff (sharedData->sharedStuff);
}
// By keeping this pointer as a member variable, the shared resource
// is guaranteed to be available for as long as the DataUserClass object.
SharedResourcePointer<MySharedData> sharedData;
};
@endcode
*/
template <typename SharedObjectType>
class SharedResourcePointer
{
public:
/** Creates an instance of the shared object.
If other SharedResourcePointer objects for this type already exist, then
this one will simply point to the same shared object that they are already
using. Otherwise, if this is the first SharedResourcePointer to be created,
then a shared object will be created automatically.
*/
SharedResourcePointer()
: sharedObject(nullptr)
{
initialise();
}
template<class T>
SharedResourcePointer(const T* const variant)
: sharedObject(nullptr)
{
initialise_variant<T>(variant);
}
SharedResourcePointer (const SharedResourcePointer&)
: sharedObject(nullptr)
{
initialise();
}
/** Destructor.
If no other SharedResourcePointer objects exist, this will also delete
the shared object to which it refers.
*/
~SharedResourcePointer()
{
SharedObjectHolder& holder = getSharedObjectHolder();
const SpinLock::ScopedLockType sl (holder.lock);
if (--(holder.refCount) == 0)
holder.sharedInstance = nullptr;
}
/** Returns the shared object. */
operator SharedObjectType*() const noexcept { return sharedObject; }
/** Returns the shared object. */
SharedObjectType& get() const noexcept { return *sharedObject; }
/** Returns the object that this pointer references.
The pointer returned may be a nullptr, of course.
*/
SharedObjectType& getObject() const noexcept { return *sharedObject; }
SharedObjectType* getPointer() const noexcept { return sharedObject; }
SharedObjectType* operator->() const noexcept { return sharedObject; }
private:
struct SharedObjectHolder : public ReferenceCountedObject
{
SpinLock lock;
ScopedPointer<SharedObjectType> sharedInstance;
int refCount;
};
static SharedObjectHolder& getSharedObjectHolder() noexcept
{
static void* holder [(sizeof (SharedObjectHolder) + sizeof(void*) - 1) / sizeof(void*)] = { nullptr };
return *reinterpret_cast<SharedObjectHolder*> (holder);
}
SharedObjectType* sharedObject;
void initialise()
{
SharedObjectHolder& holder = getSharedObjectHolder();
const SpinLock::ScopedLockType sl (holder.lock);
if (++(holder.refCount) == 1)
holder.sharedInstance = new SharedObjectType();
sharedObject = holder.sharedInstance;
}
template<class T>
void initialise_variant(const T* const variant)
{
SharedObjectHolder& holder = getSharedObjectHolder();
const SpinLock::ScopedLockType sl (holder.lock);
if (++(holder.refCount) == 1)
holder.sharedInstance = new SharedObjectType(variant);
sharedObject = holder.sharedInstance;
}
// There's no need to assign to a SharedResourcePointer because every
// instance of the class is exactly the same!
SharedResourcePointer& operator= (const SharedResourcePointer&) = delete;
};
}
#endif // WATER_SHAREDRESOURCEPOINTER_HPP_INCLUDED

+ 110
- 0
src/extra/SpinLock.hpp View File

@@ -0,0 +1,110 @@
/*
==============================================================================
This file is part of the Water library.
Copyright (c) 2016 ROLI Ltd.
Copyright (C) 2017 Filipe Coelho <falktx@falktx.com>
Permission is granted to use this software under the terms of the ISC license
http://www.isc.org/downloads/software-support-policy/isc-license/
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH REGARD
TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT,
OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
OF THIS SOFTWARE.
==============================================================================
*/
#ifndef WATER_SPINLOCK_HPP_INCLUDED
#define WATER_SPINLOCK_HPP_INCLUDED
#include "Atomic.hpp"
#include "ScopedLock.hpp"
START_NAMESPACE_DISTRHO
//==============================================================================
/**
A simple spin-lock class that can be used as a simple, low-overhead mutex for
uncontended situations.
Note that unlike a CriticalSection, this type of lock is not re-entrant, and may
be less efficient when used it a highly contended situation, but it's very small and
requires almost no initialisation.
It's most appropriate for simple situations where you're only going to hold the
lock for a very brief time.
@see CriticalSection
*/
class SpinLock
{
public:
inline SpinLock() noexcept : lock() {}
inline ~SpinLock() noexcept {}
/** Acquires the lock.
This will block until the lock has been successfully acquired by this thread.
Note that a SpinLock is NOT re-entrant, and is not smart enough to know whether the
caller thread already has the lock - so if a thread tries to acquire a lock that it
already holds, this method will never return!
It's strongly recommended that you never call this method directly - instead use the
ScopedLockType class to manage the locking using an RAII pattern instead.
*/
void enter() const noexcept
{
if (! tryEnter())
{
for (int i = 20; --i >= 0;)
if (tryEnter())
return;
while (! tryEnter())
{
#ifdef DISTRHO_OS_WINDOWS
Sleep (0);
#else
sched_yield();
#endif
}
}
}
/** Attempts to acquire the lock, returning true if this was successful. */
inline bool tryEnter() const noexcept
{
return lock.compareAndSetBool (1, 0);
}
/** Releases the lock. */
inline void exit() const noexcept
{
DISTRHO_SAFE_ASSERT_RETURN (lock.get() == 1,);
lock = 0;
}
//==============================================================================
/** Provides the type of scoped lock to use for locking a SpinLock. */
typedef GenericScopedLock <SpinLock> ScopedLockType;
/** Provides the type of scoped unlocker to use with a SpinLock. */
typedef GenericScopedUnlock <SpinLock> ScopedUnlockType;
private:
//==============================================================================
mutable Atomic<int> lock;
DISTRHO_DECLARE_NON_COPYABLE (SpinLock)
};
END_NAMESPACE_DISTRHO
#endif // WATER_SPINLOCK_HPP_INCLUDED

Write Preview
Loading…
Cancel
Save