mirror of https://github.com/LeOS-GSI/LeOS-Genesis
251 lines
7.0 KiB
C
251 lines
7.0 KiB
C
/**
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* @file BPending.h
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @section DESCRIPTION
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*
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* Module for managing a queue of jobs pending execution.
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*/
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#ifndef BADVPN_BPENDING_H
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#define BADVPN_BPENDING_H
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#include <stdint.h>
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#include <misc/debugcounter.h>
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#include <structure/SLinkedList.h>
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#include <base/DebugObject.h>
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struct BSmallPending_s;
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#include "BPending_list.h"
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#include <structure/SLinkedList_decl.h>
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/**
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* Job execution handler.
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* It is guaranteed that the associated {@link BSmallPending} object was
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* in set state.
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* The {@link BSmallPending} object enters not set state before the handler
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* is called.
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*
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* @param user as in {@link BSmallPending_Init}
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*/
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typedef void (*BSmallPending_handler) (void *user);
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/**
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* Job execution handler.
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* It is guaranteed that the associated {@link BPending} object was
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* in set state.
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* The {@link BPending} object enters not set state before the handler
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* is called.
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*
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* @param user as in {@link BPending_Init}
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*/
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typedef void (*BPending_handler) (void *user);
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/**
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* Object that contains a list of jobs pending execution.
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*/
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typedef struct {
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BPending__List jobs;
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DebugCounter pending_ctr;
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DebugObject d_obj;
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} BPendingGroup;
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/**
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* Object for queuing a job for execution.
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*/
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typedef struct BSmallPending_s {
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BPending_handler handler;
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void *user;
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BPending__ListNode pending_node; // optimization: if not pending, .next is this
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#ifndef NDEBUG
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uint8_t pending;
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#endif
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DebugObject d_obj;
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} BSmallPending;
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/**
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* Object for queuing a job for execution. This is a convenience wrapper
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* around {@link BSmallPending} with an extra field to remember the
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* {@link BPendingGroup} being used.
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*/
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typedef struct {
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BSmallPending base;
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BPendingGroup *g;
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} BPending;
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/**
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* Initializes the object.
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*
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* @param g the object
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*/
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void BPendingGroup_Init (BPendingGroup *g);
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/**
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* Frees the object.
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* There must be no {@link BPending} or {@link BSmallPending} objects using
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* this group.
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*
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* @param g the object
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*/
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void BPendingGroup_Free (BPendingGroup *g);
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/**
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* Checks if there is at least one job in the queue.
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*
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* @param g the object
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* @return 1 if there is at least one job, 0 if not
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*/
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int BPendingGroup_HasJobs (BPendingGroup *g);
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/**
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* Executes the top job on the job list.
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* The job is removed from the list and enters
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* not set state before being executed.
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* There must be at least one job in job list.
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*
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* @param g the object
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*/
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void BPendingGroup_ExecuteJob (BPendingGroup *g);
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/**
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* Returns the top job on the job list, or NULL if there are none.
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*
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* @param g the object
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* @return the top job if there is at least one job, NULL if not
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*/
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BSmallPending * BPendingGroup_PeekJob (BPendingGroup *g);
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/**
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* Initializes the object.
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* The object is initialized in not set state.
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*
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* @param o the object
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* @param g pending group to use
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* @param handler job execution handler
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* @param user value to pass to handler
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*/
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void BSmallPending_Init (BSmallPending *o, BPendingGroup *g, BSmallPending_handler handler, void *user);
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/**
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* Frees the object.
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* The execution handler will not be called after the object
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* is freed.
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*
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* @param o the object
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* @param g pending group. Must be the same as was used in {@link BSmallPending_Init}.
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*/
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void BSmallPending_Free (BSmallPending *o, BPendingGroup *g);
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/**
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* Changes the job execution handler.
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*
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* @param o the object
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* @param handler job execution handler
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* @param user value to pass to handler
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*/
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void BSmallPending_SetHandler (BSmallPending *o, BSmallPending_handler handler, void *user);
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/**
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* Enables the job, pushing it to the top of the job list.
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* If the object was already in set state, the job is removed from its
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* current position in the list before being pushed.
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* The object enters set state.
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*
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* @param o the object
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* @param g pending group. Must be the same as was used in {@link BSmallPending_Init}.
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*/
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void BSmallPending_Set (BSmallPending *o, BPendingGroup *g);
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/**
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* Disables the job, removing it from the job list.
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* If the object was not in set state, nothing is done.
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* The object enters not set state.
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*
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* @param o the object
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* @param g pending group. Must be the same as was used in {@link BSmallPending_Init}.
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*/
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void BSmallPending_Unset (BSmallPending *o, BPendingGroup *g);
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/**
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* Checks if the job is in set state.
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*
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* @param o the object
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* @return 1 if in set state, 0 if not
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*/
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int BSmallPending_IsSet (BSmallPending *o);
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/**
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* Initializes the object.
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* The object is initialized in not set state.
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*
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* @param o the object
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* @param g pending group to use
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* @param handler job execution handler
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* @param user value to pass to handler
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*/
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void BPending_Init (BPending *o, BPendingGroup *g, BPending_handler handler, void *user);
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/**
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* Frees the object.
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* The execution handler will not be called after the object
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* is freed.
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*
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* @param o the object
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*/
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void BPending_Free (BPending *o);
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/**
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* Enables the job, pushing it to the top of the job list.
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* If the object was already in set state, the job is removed from its
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* current position in the list before being pushed.
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* The object enters set state.
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*
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* @param o the object
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*/
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void BPending_Set (BPending *o);
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/**
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* Disables the job, removing it from the job list.
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* If the object was not in set state, nothing is done.
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* The object enters not set state.
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*
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* @param o the object
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*/
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void BPending_Unset (BPending *o);
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/**
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* Checks if the job is in set state.
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*
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* @param o the object
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* @return 1 if in set state, 0 if not
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*/
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int BPending_IsSet (BPending *o);
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#endif
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