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Diffstat (limited to 'ace/Message_Queue.h')
| -rw-r--r-- | ace/Message_Queue.h | 319 |
1 files changed, 0 insertions, 319 deletions
diff --git a/ace/Message_Queue.h b/ace/Message_Queue.h deleted file mode 100644 index 3be9699395c..00000000000 --- a/ace/Message_Queue.h +++ /dev/null @@ -1,319 +0,0 @@ -/* -*- C++ -*- */ -// $Id$ - -// ============================================================================ -// -// = LIBRARY -// ace -// -// = FILENAME -// Message_Queue.h -// -// = AUTHOR -// Doug Schmidt -// -// ============================================================================ - -#if !defined (ACE_MESSAGE_LIST_H) -#define ACE_MESSAGE_LIST_H - -#include "ace/Message_Block.h" -#include "ace/IO_Cntl_Msg.h" - -// Forward decls. -class ACE_Notification_Strategy; -template <ACE_SYNCH_1> class ACE_Message_Queue_Iterator; -template <ACE_SYNCH_1> class ACE_Message_Queue_Reverse_Iterator; - -template <ACE_SYNCH_1> -class ACE_Message_Queue - // = TITLE - // A threaded message queueing facility, modeled after the - // queueing facilities in System V STREAMs. - // - // = DESCRIPTION - // An <ACE_Message_Queue> is the central queueing facility for - // messages in the ASX framework. If <ACE_SYNCH_1> is - // ACE_MT_SYNCH then all operations are thread-safe. Otherwise, - // if it's <ACE_NULL_SYNCH> then there's no locking overhead. -{ -friend class ACE_Message_Queue_Iterator<ACE_SYNCH_2>; -friend class ACE_Message_Queue_Reverse_Iterator<ACE_SYNCH_2>; -public: - - // = Traits - typedef ACE_Message_Queue_Iterator<ACE_SYNCH_2> ITERATOR; - typedef ACE_Message_Queue_Reverse_Iterator<ACE_SYNCH_2> REVERSE_ITERATOR; - - // = Default high and low water marks. - enum - { - DEFAULT_LWM = 0, - // Default low watermark. - DEFAULT_HWM = 16 * 1024, - // Default high watermark (16 K). - WAS_ACTIVE = 1, - // Message queue was active before activate() or deactivate(). - WAS_INACTIVE = 2 - // Message queue was inactive before activate() or deactivate(). - }; - - // = Initialization and termination methods. - ACE_Message_Queue (size_t hwm = DEFAULT_HWM, - size_t lwm = DEFAULT_LWM, - ACE_Notification_Strategy * = 0); - - // Create a message queue with all the defaults. - int open (size_t hwm = DEFAULT_HWM, - size_t lwm = DEFAULT_LWM, - ACE_Notification_Strategy * = 0); - // Create a message queue with all the defaults. - - int close (void); - // Close down the message queue and release all resources. - - virtual ~ACE_Message_Queue (void); - // Close down the message queue and release all resources. - - int peek_dequeue_head (ACE_Message_Block *&first_item, - ACE_Time_Value *tv = 0); - // Retrieve the first ACE_Message_Block without removing it. - // Returns -1 on failure, else the number of items still on the - // queue. - - // = For all the following three routines if tv == 0, the caller - // will block until action is possible, else will wait until the - // absolute time specified in *tv elapses). Calls will return, - // however, when queue is closed, deactivated, when a signal occurs, - // or if the time specified in tv elapses, (in which case errno = - // EWOULDBLOCK). - - int enqueue_prio (ACE_Message_Block *new_item, ACE_Time_Value *tv = 0); - // Enqueue an <ACE_Message_Block *> into the <Message_Queue> in - // accordance with its <msg_priority> (0 is lowest priority). FIFO - // order is maintained when messages of the same priority are - // inserted consecutively. Returns -1 on failure, else the number - // of items still on the queue. - - int enqueue (ACE_Message_Block *new_item, ACE_Time_Value *tv = 0); - // This is an alias for <enqueue_prio>. It's only here for - // backwards compatibility and will go away in a subsequent release. - // Please use <enqueue_prio> instead. - - int enqueue_tail (ACE_Message_Block *new_item, ACE_Time_Value *tv = 0); - // Enqueue an <ACE_Message_Block *> at the end of the queue. - // Returns -1 on failure, else the number of items still on the - // queue. - - int enqueue_head (ACE_Message_Block *new_item, ACE_Time_Value *tv = 0); - // Enqueue an <ACE_Message_Block *> at the head of the queue. - // Returns -1 on failure, else the number of items still on the - // queue. - - int dequeue_head (ACE_Message_Block *&first_item, ACE_Time_Value *tv = 0); - // Dequeue and return the <ACE_Message_Block *> at the head of the - // queue. Returns -1 on failure, else the number of items still on - // the queue. - - // = Checks if queue is full/empty. - int is_full (void); - // True if queue is full, else false. - int is_empty (void); - // True if queue is empty, else false. - - size_t message_bytes (void); - // Number of total bytes on the queue. - - size_t message_count (void); - // Number of total messages on the queue. - - // = Flow control routines - - size_t high_water_mark (void); - // Get high watermark. - void high_water_mark (size_t hwm); - // Set high watermark. - size_t low_water_mark (void); - // Get low watermark. - void low_water_mark (size_t lwm); - // Set low watermark. - - // = Activation control methods. - - int deactivate (void); - // Deactivate the queue and wakeup all threads waiting on the queue - // so they can continue. No messages are removed from the queue, - // however. Any other operations called until the queue is - // activated again will immediately return -1 with <errno> == - // ESHUTDOWN. Returns WAS_INACTIVE if queue was inactive before the - // call and WAS_ACTIVE if queue was active before the call. - - int activate (void); - // Reactivate the queue so that threads can enqueue and dequeue - // messages again. Returns WAS_INACTIVE if queue was inactive - // before the call and WAS_ACTIVE if queue was active before the - // call. - - virtual int notify (void); - // This hook is automatically invoked by <enqueue_head>, - // <enqueue_tail>, and <enqueue_prio> when a new item is inserted - // into the queue. Subclasses can override this method to perform - // specific notification strategies (e.g., signaling events for a - // <ReactorEx>, notifying a <Reactor>, etc.). In a multi-threaded - // application with concurrent consumers, there is no guarantee that - // the queue will be still be non-empty by the time the notification - // occurs. - - // = Get/set the notification strategy for the <Message_Queue> - ACE_Notification_Strategy *notification_strategy (void); - void notification_strategy (ACE_Notification_Strategy *s); - - void dump (void) const; - // Dump the state of an object. - - ACE_ALLOC_HOOK_DECLARE; - // Declare the dynamic allocation hooks. - -protected: - // = Routines that actually do the enqueueing and dequeueing. - // These routines assume that locks are held by the corresponding - // public methods. - - int enqueue_i (ACE_Message_Block *new_item); - // Enqueue an <ACE_Message_Block *> in accordance with its priority. - - int enqueue_tail_i (ACE_Message_Block *new_item); - // Enqueue an <ACE_Message_Block *> at the end of the queue. - - int enqueue_head_i (ACE_Message_Block *new_item); - // Enqueue an <ACE_Message_Block *> at the head of the queue. - - int dequeue_head_i (ACE_Message_Block *&first_item); - // Dequeue and return the <ACE_Message_Block *> at the head of the - // queue. - - // = Check the boundary conditions (assumes locks are held). - int is_full_i (void); - // True if queue is full, else false. - int is_empty_i (void); - // True if queue is empty, else false. - - // = Implementation of the public activate() and deactivate() methods above (assumes locks are held). - int deactivate_i (void); - // Deactivate the queue. - int activate_i (void); - // Activate the queue. - - ACE_Message_Block *head_; - // Pointer to head of ACE_Message_Block list. - - ACE_Message_Block *tail_; - // Pointer to tail of ACE_Message_Block list. - - size_t low_water_mark_; - // Lowest number before unblocking occurs. - - size_t high_water_mark_; - // Greatest number of bytes before blocking. - - size_t cur_bytes_; - // Current number of bytes in the queue. - - size_t cur_count_; - // Current number of messages in the queue. - - int deactivated_; - // Indicates that the queue is inactive. - - ACE_Notification_Strategy *notification_strategy_; - // The notification strategy used when a new message is enqueued. - - // = Synchronization primitives for controlling concurrent access. - ACE_SYNCH_MUTEX lock_; - // Protect queue from concurrent access. - - ACE_SYNCH_CONDITION notempty_cond_; - // Used to make threads sleep until the queue is no longer empty. - - ACE_SYNCH_CONDITION notfull_cond_; - // Used to make threads sleep until the queue is no longer full. -}; - -template <ACE_SYNCH_1> -class ACE_Message_Queue_Iterator - // = TITLE - // Iterator for the <ACE_Message_Queue>. -{ -public: - // = Initialization method. - ACE_Message_Queue_Iterator (ACE_Message_Queue <ACE_SYNCH_2> &queue); - - // = Iteration methods. - int next (ACE_Message_Block *&entry); - // Pass back the <entry> that hasn't been seen in the queue. - // Returns 0 when all items have been seen, else 1. - - int advance (void); - // Move forward by one element in the queue - - void dump (void) const; - // Dump the state of an object. - - ACE_ALLOC_HOOK_DECLARE; - // Declare the dynamic allocation hooks. - -private: - ACE_Message_Queue <ACE_SYNCH_2> &queue_; - // Message_Queue we are iterating over. - - ACE_Message_Block *curr_; - // Keeps track of how far we've advanced... -}; - -template <ACE_SYNCH_1> -class ACE_Message_Queue_Reverse_Iterator - // = TITLE - // Reverse Iterator for the <ACE_Message_Queue>. -{ -public: - // = Initialization method. - ACE_Message_Queue_Reverse_Iterator (ACE_Message_Queue <ACE_SYNCH_2> &queue); - - // = Iteration methods. - int next (ACE_Message_Block *&entry); - // Pass back the <entry> that hasn't been seen in the queue. - // Returns 0 when all items have been seen, else 1. - - int advance (void); - // Move forward by one element in the queue - - void dump (void) const; - // Dump the state of an object. - - ACE_ALLOC_HOOK_DECLARE; - // Declare the dynamic allocation hooks. - -private: - ACE_Message_Queue <ACE_SYNCH_2> &queue_; - // Message_Queue we are iterating over. - - ACE_Message_Block *curr_; - // Keeps track of how far we've advanced... -}; - -// This must go here to avoid problems with circular includes. -#include "ace/Strategies.h" - -#if defined (__ACE_INLINE__) -#include "ace/Message_Queue.i" -#endif /* __ACE_INLINE__ */ - -#if defined (ACE_TEMPLATES_REQUIRE_SOURCE) -#include "ace/Message_Queue.cpp" -#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */ - -#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA) -#pragma implementation ("Message_Queue.cpp") -#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */ - -#endif /* ACE_MESSAGE_LIST_H */ |