From 2b36cbe2d5a387c088f5c4b3cb7a93f869986ee9 Mon Sep 17 00:00:00 2001 From: Mark Michelson Date: Fri, 16 Nov 2012 04:44:12 +0000 Subject: [PATCH] Change the write-up on taskprocessors to reflect the new design. git-svn-id: https://origsvn.digium.com/svn/asterisk/team/mmichelson/threadpool@376382 65c4cc65-6c06-0410-ace0-fbb531ad65f3 --- include/asterisk/taskprocessor.h | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) diff --git a/include/asterisk/taskprocessor.h b/include/asterisk/taskprocessor.h index 895bc17643..f2cf4c63c7 100644 --- a/include/asterisk/taskprocessor.h +++ b/include/asterisk/taskprocessor.h @@ -22,22 +22,28 @@ * * \author Dwayne M. Hubbard * - * \note A taskprocessor is a named singleton containing a processing thread and - * a task queue that serializes tasks pushed into it by [a] module(s) that reference the taskprocessor. - * A taskprocessor is created the first time its name is requested via the ast_taskprocessor_get() - * function and destroyed when the taskprocessor reference count reaches zero. + * \note A taskprocessor is a named singleton containing a task queue that serializes tasks pushed + * into it by [a] module(s) that reference the taskprocessor. A taskprocessor is created the first + * time its name is requested via the ast_taskprocessor_get() function and destroyed when the + * taskprocessor reference count reaches zero. A taskprocessor also contains an accompanying + * listener that is told when changes in the task queue occur. * - * Modules that obtain a reference to a taskprocessor can queue tasks into the taskprocessor - * to be processed by the singleton processing thread when the task is popped off the front - * of the queue. A task is a wrapper around a task-handling function pointer and a data - * pointer. It is the responsibility of the task handling function to free memory allocated for - * the task data pointer. A task is pushed into a taskprocessor queue using the + * A task is a wrapper around a task-handling function pointer and a data + * pointer. A task is pushed into a taskprocessor queue using the * ast_taskprocessor_push(taskprocessor, taskhandler, taskdata) function and freed by the * taskprocessor after the task handling function returns. A module releases its reference to a * taskprocessor using the ast_taskprocessor_unreference() function which may result in the * destruction of the taskprocessor if the taskprocessor's reference count reaches zero. Tasks waiting * to be processed in the taskprocessor queue when the taskprocessor reference count reaches zero * will be purged and released from the taskprocessor queue without being processed. + * + * The taskprocessor listener has the flexibility of doling out tasks to best fit the module's + * needs. For instance, a taskprocessor listener may have a single dispatch thread that handles + * all tasks, or it may dispatch tasks to a thread pool. + * + * There is a default taskprocessor listener that will be used if a taskprocessor is created without + * a listener. This default listener runs tasks sequentially in a single thread. The listener will + * execute tasks as long as there are tasks to be processed. */ #ifndef __AST_TASKPROCESSOR_H__