Augustin Cavalier
6554d7448d
Condition variables are now a pretty common way the kernel blocks threads. That means the "threads" command was getting difficult to navigate, since at any given time, a lot of threads could be blocked on "cvar". Now we try (carefully, because it could fault!) to fetch the first 4 characters of the "type" name and display then. This suffices to distinguish the most common object block types in the list at a glance (e.g. "cvar:port" for port reads, the most common.) Change-Id: I94f4b59fd78b7ebdce913944551a5e98f0ca2e33 Reviewed-on: https://review.haiku-os.org/c/haiku/+/6605 Reviewed-by: waddlesplash <[email protected]>
129 lines
3.0 KiB
C++
129 lines
3.0 KiB
C++
/*
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* Copyright 2007-2011, Ingo Weinhold, [email protected].
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* Copyright 2019, Haiku, Inc. All rights reserved.
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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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struct mutex;
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struct recursive_lock;
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struct ConditionVariable;
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struct ConditionVariableEntry
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: DoublyLinkedListLinkImpl<ConditionVariableEntry> {
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public:
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ConditionVariableEntry();
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~ConditionVariableEntry();
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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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ConditionVariable* Variable() const;
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private:
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inline void _AddToLockedVariable(ConditionVariable* variable);
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void _RemoveFromVariable();
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private:
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ConditionVariable* fVariable;
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Thread* fThread;
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status_t fWaitStatus;
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friend struct ConditionVariable;
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};
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struct 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();
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inline void NotifyOne(status_t result = B_OK);
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inline void NotifyAll(status_t result = B_OK);
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static void NotifyOne(const void* object, status_t result);
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static void NotifyAll(const void* object, status_t result);
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void Add(ConditionVariableEntry* entry);
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int32 EntriesCount() { return atomic_get(&fEntriesCount); }
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// Convenience methods, no ConditionVariableEntry required.
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status_t Wait(uint32 flags = 0, bigtime_t timeout = 0);
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status_t Wait(mutex* lock, uint32 flags = 0, bigtime_t timeout = 0);
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status_t Wait(recursive_lock* lock, uint32 flags = 0, bigtime_t timeout = 0);
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const void* Object() const { return fObject; }
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const char* ObjectType() const { return fObjectType; }
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static void ListAll();
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void Dump() const;
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private:
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static void _Notify(const void* object, bool all, status_t result);
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void _Notify(bool all, status_t result);
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void _NotifyLocked(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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spinlock fLock;
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EntryList fEntries;
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int32 fEntriesCount;
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ConditionVariable* fNext;
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friend struct ConditionVariableEntry;
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friend struct ConditionVariableHashDefinition;
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friend ssize_t debug_condition_variable_type_strlcpy(ConditionVariable* cvar,
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char* name, size_t size);
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};
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inline void
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ConditionVariable::NotifyOne(status_t result)
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{
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_Notify(false, result);
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}
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inline void
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ConditionVariable::NotifyAll(status_t result)
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{
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_Notify(true, result);
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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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