Ingo Weinhold
5c99d63970
introduces the following relevant changes:
* VMCache:
- Renamed vm_cache to VMCache, merged it with vm_store and made it a
C++ class with virtual methods (replacing the store operations).
Turned the different store implementations into subclasses.
- Introduced MergeStore() callback, changed semantics of Commit().
- Changed locking and referencing semantics. A reference can only be
acquired/released with the cache locked. An unreferenced cache is
deleted and a mergeable cache merged when it is unlocked. This
removes the "busy" state of a cache and simplifies the page fault
code.
* Added VMAnonymousCache, which will implement swap support (work by
Zhao Shuai). It is not integrated and used yet, though.
* Enabled the mutex/recursive lock holder asserts.
* Fixed DoublyLinkedList::Swap().
* Generalized the low memory handler to a low resource handler. And made
semaphores and reserved memory handled resources. Made
vm_try_resource_memory() optionally wait (with timeout), and used that
feature to reserve memory for areas.
...
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26572 a95241bf-73f2-0310-859d-f6bbb57e9c96
133 lines
2.7 KiB
C++
133 lines
2.7 KiB
C++
/*
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* Copyright 2007-2008, Ingo Weinhold, [email protected].
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _KERNEL_CONDITION_VARIABLE_H
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#define _KERNEL_CONDITION_VARIABLE_H
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#include <OS.h>
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#include <debug.h>
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#ifdef __cplusplus
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#include <util/DoublyLinkedList.h>
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#include <util/OpenHashTable.h>
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class ConditionVariable;
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struct ConditionVariableEntry
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: DoublyLinkedListLinkImpl<ConditionVariableEntry> {
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public:
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#if KDEBUG
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inline ConditionVariableEntry();
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inline ~ConditionVariableEntry();
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#endif
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bool Add(const void* object);
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status_t Wait(uint32 flags = 0, bigtime_t timeout = 0);
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status_t Wait(const void* object, uint32 flags = 0,
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bigtime_t timeout = 0);
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inline ConditionVariable* Variable() const { return fVariable; }
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private:
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inline void AddToVariable(ConditionVariable* variable);
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private:
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ConditionVariable* fVariable;
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struct thread* fThread;
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status_t fWaitStatus;
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friend class ConditionVariable;
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};
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class ConditionVariable : protected HashTableLink<ConditionVariable> {
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public:
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void Init(const void* object,
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const char* objectType);
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// for anonymous (unpublished) cvars
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void Publish(const void* object,
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const char* objectType);
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void Unpublish(bool threadsLocked = false);
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inline void NotifyOne(bool threadsLocked = false);
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inline void NotifyAll(bool threadsLocked = false);
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void Add(ConditionVariableEntry* entry);
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status_t Wait(uint32 flags = 0, bigtime_t timeout = 0);
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// all-in one, i.e. doesn't need a
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// ConditionVariableEntry
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const void* Object() const { return fObject; }
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static void ListAll();
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void Dump() const;
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private:
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void _Notify(bool all, bool threadsLocked);
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void _NotifyChecked(bool all, status_t result);
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protected:
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typedef DoublyLinkedList<ConditionVariableEntry> EntryList;
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const void* fObject;
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const char* fObjectType;
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EntryList fEntries;
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friend class ConditionVariableEntry;
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friend class ConditionVariableHashDefinition;
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};
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#if KDEBUG
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inline
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ConditionVariableEntry::ConditionVariableEntry()
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: fVariable(NULL)
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{
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}
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inline
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ConditionVariableEntry::~ConditionVariableEntry()
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{
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if (fVariable != NULL) {
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panic("Destroying condition variable entry %p, but it's still "
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"attached to variable %p\n", this, fVariable);
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}
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}
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#endif
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inline void
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ConditionVariable::NotifyOne(bool threadsLocked)
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{
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_Notify(false, threadsLocked);
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}
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inline void
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ConditionVariable::NotifyAll(bool threadsLocked)
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{
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_Notify(true, threadsLocked);
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}
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extern "C" {
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#endif // __cplusplus
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extern void condition_variable_init();
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif /* _KERNEL_CONDITION_VARIABLE_H */
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