#include <Message_Queue_T.h>
Inheritance diagram for ACE_Message_Queue_Ex< ACE_MESSAGE_TYPE, >:
Public Types | |
| enum | { DEFAULT_PRIORITY = 0 } |
Public Methods | |
| ACE_Message_Queue_Ex (size_t high_water_mark=ACE_Message_Queue_Base::DEFAULT_HWM, size_t low_water_mark=ACE_Message_Queue_Base::DEFAULT_LWM, ACE_Notification_Strategy *=0) | |
| virtual int | open (size_t hwm=ACE_Message_Queue_Base::DEFAULT_HWM, size_t lwm=ACE_Message_Queue_Base::DEFAULT_LWM, ACE_Notification_Strategy *=0) |
| virtual int | close (void) |
| Close down the message queue and release all resources. | |
| virtual | ~ACE_Message_Queue_Ex (void) |
| Close down the message queue and release all resources. | |
| virtual int | flush (void) |
| virtual int | flush_i (void) |
| virtual int | peek_dequeue_head (ACE_MESSAGE_TYPE *&first_item, ACE_Time_Value *timeout=0) |
| virtual int | enqueue_prio (ACE_MESSAGE_TYPE *new_item, ACE_Time_Value *timeout=0) |
| virtual int | enqueue_deadline (ACE_MESSAGE_TYPE *new_item, ACE_Time_Value *timeout=0) |
| virtual int | enqueue (ACE_MESSAGE_TYPE *new_item, ACE_Time_Value *timeout=0) |
| virtual int | enqueue_tail (ACE_MESSAGE_TYPE *new_item, ACE_Time_Value *timeout=0) |
| virtual int | enqueue_head (ACE_MESSAGE_TYPE *new_item, ACE_Time_Value *timeout=0) |
| virtual int | dequeue (ACE_MESSAGE_TYPE *&first_item, ACE_Time_Value *timeout=0) |
| This method is an alias for the following <dequeue_head> method. | |
| virtual int | dequeue_head (ACE_MESSAGE_TYPE *&first_item, ACE_Time_Value *timeout=0) |
| virtual int | dequeue_prio (ACE_MESSAGE_TYPE *&dequeued, ACE_Time_Value *timeout=0) |
| virtual int | dequeue_tail (ACE_MESSAGE_TYPE *&dequeued, ACE_Time_Value *timeout=0) |
| virtual int | dequeue_deadline (ACE_MESSAGE_TYPE *&dequeued, ACE_Time_Value *timeout=0) |
| virtual int | is_full (void) |
| True if queue is full, else false. | |
| virtual int | is_empty (void) |
| True if queue is empty, else false. | |
| virtual size_t | message_bytes (void) |
| virtual size_t | message_length (void) |
| virtual int | message_count (void) |
| virtual void | message_bytes (size_t new_size) |
| virtual void | message_length (size_t new_length) |
| virtual size_t | high_water_mark (void) |
| virtual void | high_water_mark (size_t hwm) |
| virtual size_t | low_water_mark (void) |
| virtual void | low_water_mark (size_t lwm) |
| virtual int | deactivate (void) |
| virtual int | activate (void) |
| virtual int | pulse (void) |
| virtual int | state (void) |
| virtual int | deactivated (void) |
| virtual int | notify (void) |
| virtual ACE_Notification_Strategy * | notification_strategy (void) |
| Get the notification strategy for the <Message_Queue>. | |
| virtual void | notification_strategy (ACE_Notification_Strategy *s) |
| Set the notification strategy for the <Message_Queue>. | |
| virtual ACE_SYNCH_MUTEX_T & | lock (void) |
| Returns a reference to the lock used by the <ACE_Message_Queue_Ex>. | |
| virtual void | dump (void) const |
| Dump the state of an object. | |
Public Attributes | |
| ACE_ALLOC_HOOK_DECLARE | |
| Declare the dynamic allocation hooks. | |
Private Attributes | |
| ACE_Message_Queue< ACE_SYNCH_USE > | queue_ |
| Implement this via an <ACE_Message_Queue>. | |
An <ACE_Message_Queue_Ex> is a strongly-typed version of the <ACE_Message_Queue>. If <ACE_SYNCH_DECL> is <ACE_MT_SYNCH> then all operations are thread-safe. Otherwise, if it's <ACE_NULL_SYNCH> then there's no locking overhead.
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Initialize an <ACE_Message_Queue>. The <high_water_mark> determines how many bytes can be stored in a queue before it's considered "full." Supplier threads must block until the queue is no longer full. The <low_water_mark> determines how many bytes must be in the queue before supplier threads are allowed to enqueue additional <ACE_Message_Block>s. By default, the <high_water_mark> equals the <low_water_mark>, which means that suppliers will be able to enqueue new messages as soon as a consumer removes any message from the queue. Making the <low_water_mark> smaller than the <high_water_mark> forces consumers to drain more messages from the queue before suppliers can enqueue new messages, which can minimize the "silly window syndrome." |
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Close down the message queue and release all resources.
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Reactivate the queue so that threads can enqueue and dequeue messages again. Returns the state of the queue before the call. |
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Close down the message queue and release all resources.
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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. |
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Returns true if the state of the queue is DEACTIVATED, but false if the queue's state is ACTIVATED or PULSED. |
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This method is an alias for the following <dequeue_head> method.
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Dequeue and return the <ACE_MESSAGE_TYPE *> with the lowest deadline time. Note that <timeout> uses <{absolute}> time rather than <{relative}> time. If the <timeout> elapses without receiving a message -1 is returned and <errno> is set to <EWOULDBLOCK>. If the queue is deactivated -1 is returned and <errno> is set to <ESHUTDOWN>. Otherwise, returns -1 on failure, else the number of items still on the queue. |
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Dequeue and return the <ACE_MESSAGE_TYPE *> at the head of the queue. Note that <timeout> uses <{absolute}> time rather than <{relative}> time. If the <timeout> elapses without receiving a message -1 is returned and <errno> is set to <EWOULDBLOCK>. If the queue is deactivated -1 is returned and <errno> is set to <ESHUTDOWN>. Otherwise, returns -1 on failure, else the number of items still on the queue. |
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Dequeue and return the <ACE_MESSAGE_TYPE *> that has the lowest priority. Note that <timeout> uses <{absolute}> time rather than <{relative}> time. If the <timeout> elapses without receiving a message -1 is returned and <errno> is set to <EWOULDBLOCK>. If the queue is deactivated -1 is returned and <errno> is set to <ESHUTDOWN>. Otherwise, returns -1 on failure, else the number of items still on the queue. |
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Dequeue and return the <ACE_MESSAGE_TYPE *> at the tail of the queue. Note that <timeout> uses <{absolute}> time rather than <{relative}> time. If the <timeout> elapses without receiving a message -1 is returned and <errno> is set to <EWOULDBLOCK>. If the queue is deactivated -1 is returned and <errno> is set to <ESHUTDOWN>. Otherwise, returns -1 on failure, else the number of items still on the queue. |
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Dump the state of an object.
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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. Note that <timeout> uses <{absolute}> time rather than <{relative}> time. |
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Enqueue an <ACE_MESSAGE_TYPE *> into the <Message_Queue> in accordance with its <msg_deadline_time>. FIFO order is maintained when messages of the same deadline time are inserted consecutively. Note that <timeout> uses <{absolute}> time rather than <{relative}> time. If the <timeout> elapses without receiving a message -1 is returned and <errno> is set to <EWOULDBLOCK>. If the queue is deactivated -1 is returned and <errno> is set to <ESHUTDOWN>. Otherwise, returns -1 on failure, else the number of items still on the queue. |
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Enqueue an <ACE_MESSAGE_TYPE *> at the head of the queue. Note that <timeout> uses <{absolute}> time rather than <{relative}> time. If the <timeout> elapses without receiving a message -1 is returned and <errno> is set to <EWOULDBLOCK>. If the queue is deactivated -1 is returned and <errno> is set to <ESHUTDOWN>. Otherwise, returns -1 on failure, else the number of items still on the queue. |
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Enqueue an <ACE_MESSAGE_TYPE *> 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. Note that <timeout> uses <{absolute}> time rather than <{relative}> time. If the <timeout> elapses without receiving a message -1 is returned and <errno> is set to <EWOULDBLOCK>. If the queue is deactivated -1 is returned and <errno> is set to <ESHUTDOWN>. Otherwise, returns -1 on failure, else the number of items still on the queue. |
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Enqueue an <ACE_MESSAGE_TYPE *> at the end of the queue. Note that <timeout> uses <{absolute}> time rather than <{relative}> time. If the <timeout> elapses without receiving a message -1 is returned and <errno> is set to <EWOULDBLOCK>. If the queue is deactivated -1 is returned and <errno> is set to <ESHUTDOWN>. Otherwise, returns -1 on failure, else the number of items still on the queue. |
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Release all resources from the message queue but do not mark it as deactivated. This method holds the queue lock during this operation. Returns the number of messages flushed. |
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Release all resources from the message queue but do not mark it as deactivated. This method does not hold the queue lock during this operation, i.e., it assume the lock is held externally. Returns the number of messages flushed. |
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Set the high watermark, which determines how many bytes can be stored in a queue before it's considered "full." |
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Get high watermark. |
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True if queue is empty, else false.
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True if queue is full, else false.
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Returns a reference to the lock used by the <ACE_Message_Queue_Ex>.
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Set the low watermark, which determines how many bytes must be in the queue before supplier threads are allowed to enqueue additional <ACE_MESSAGE_TYPE>s. |
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Get low watermark. |
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New value of the number of total bytes on the queue, i.e., sum of the message block sizes. |
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Number of total bytes on the queue, i.e., sum of the message block sizes. |
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Number of total messages on the queue. |
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New value of the number of total length on the queue, i.e., sum of the message block lengths. |
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Number of total length on the queue, i.e., sum of the message block lengths. |
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Set the notification strategy for the <Message_Queue>.
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Get the notification strategy for the <Message_Queue>.
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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 <WFMO_Reactor>, 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. |
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Initialize an <ACE_Message_Queue>. The <high_water_mark> determines how many bytes can be stored in a queue before it's considered "full." Supplier threads must block until the queue is no longer full. The <low_water_mark> determines how many bytes must be in the queue before supplier threads are allowed to enqueue additional <ACE_Message_Block>s. By default, the <high_water_mark> equals the <low_water_mark>, which means that suppliers will be able to enqueue new messages as soon as a consumer removes any message from the queue. Making the <low_water_mark> smaller than the <high_water_mark> forces consumers to drain more messages from the queue before suppliers can enqueue new messages, which can minimize the "silly window syndrome." |
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Retrieve the first <ACE_MESSAGE_TYPE> without removing it. Note that <timeout> uses <{absolute}> time rather than <{relative}> time. If the <timeout> elapses without receiving a message -1 is returned and <errno> is set to <EWOULDBLOCK>. If the queue is deactivated -1 is returned and <errno> is set to <ESHUTDOWN>. Otherwise, returns -1 on failure, else the number of items still on the queue. |
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Pulse the queue to wake up any waiting threads. Changes the queue state to PULSED; future enqueue/dequeue operations proceed as in ACTIVATED state.
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Returns the current state of the queue, which can be one of ACTIVATED, DEACTIVATED, or PULSED. |
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Declare the dynamic allocation hooks.
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Implement this via an <ACE_Message_Queue>.
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1.2.18