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// -*- C++ -*-
//=============================================================================
/**
* @file Token_Manager.h
*
* @author Tim Harrison (harrison@cs.wustl.edu)
*/
//=============================================================================
#ifndef ACE_TOKEN_MANAGER_H
#define ACE_TOKEN_MANAGER_H
#include /**/ "ace/pre.h"
#include /**/ "ace/config-all.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Local_Tokens.h"
#if defined (ACE_HAS_TOKENS_LIBRARY)
#include "ace/Null_Mutex.h"
#include "ace/Map_Manager.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
class ACE_Local_Mutex;
class ACE_Mutex_Token;
/**
* @class ACE_Token_Manager
*
* @brief Manages all tokens in a process space.
*
* Factory: Proxies use the token manager to obtain token
* references. This allows multiple proxies to reference the same
* logical token.
* Deadlock detection: Tokens use the manager to check for
* deadlock situations during acquires.
*/
class ACE_Export ACE_Token_Manager : public ACE_Cleanup
{
// To add a new type of token (e.g. semaphore), do the following
// steps: 1. Create a new derivation of ACE_Token. This class
// defines the semantics of the new Token. 2. Create a
// derivation of ACE_Token_Manager. You will only need to
// redefine make_mutex.
public:
ACE_Token_Manager (void);
virtual ~ACE_Token_Manager (void);
/// Get the pointer to token manager singleton.
static ACE_Token_Manager *instance (void);
/// Set the pointer to token manager singleton.
void instance (ACE_Token_Manager *);
/**
* The Token manager uses ACE_Token_Proxy::token_id_ to look for
* an existing token. If none is found, the Token Manager calls
* ACE_Token_Proxy::create_token to create a new one. When
* finished, sets ACE_Token_Proxy::token_. @a token_name uniquely
* id's the token name.
*/
void get_token (ACE_Token_Proxy *, const ACE_TCHAR *token_name);
/**
* Check whether acquire will cause deadlock or not.
* returns 1 if the acquire will _not_ cause deadlock.
* returns 0 if the acquire _will_ cause deadlock.
* This method ignores recursive acquisition. That is, it will not
* report deadlock if the client holding the token requests the
* token again. Thus, it assumes recursive mutexes.
*/
int check_deadlock (ACE_Token_Proxy *proxy);
int check_deadlock (ACE_Tokens *token, ACE_Token_Proxy *proxy);
/// Notify the token manager that a token has been released. If as a
/// result, there is no owner of the token, the token is deleted.
void release_token (ACE_Tokens *&token);
/**
* This is to allow Tokens to perform atomic transactions. The
* typical usage is to acquire this mutex, check for a safe_acquire,
* perform some queueing (if need be) and then release the lock.
* This is necessary since safe_acquire is implemented in terms of
* the Token queues.
*/
ACE_TOKEN_CONST::MUTEX &mutex (void);
/// Dump the state of the class.
void dump () const;
/// Turn debug mode on/off.
void debug (bool d);
private:
/// Whether to print debug messages or not.
bool debug_;
/// pointer to singleton token manager.
static ACE_Token_Manager *token_manager_;
/// Return the token that the given client_id is waiting for, if any
ACE_Tokens *token_waiting_for (const ACE_TCHAR *client_id);
/// ACE_Mutex_Token used to lock internal data structures.
ACE_TOKEN_CONST::MUTEX lock_;
/// This may be changed to a template type.
typedef ACE_Token_Name TOKEN_NAME;
/// COLLECTION maintains a mapping from token names to ACE_Tokens*
typedef ACE_Map_Manager<TOKEN_NAME, ACE_Tokens *, ACE_Null_Mutex>
COLLECTION;
/// COLLECTION maintains a mapping from token names to ACE_Tokens*.
COLLECTION collection_;
};
ACE_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
#include "ace/Token_Manager.inl"
#endif /* __ACE_INLINE__ */
#endif /* ACE_HAS_TOKENS_LIBRARY */
#include /**/ "ace/post.h"
#endif /* ACE_TOKEN_MANAGER_H */
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