source: SVN/cambria/redboot/packages/redboot/current/src/net/timers.c @ 1

Last change on this file since 1 was 1, checked in by Tim Harvey, 2 years ago

restored latest version of files from server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 3.5 KB
Line 
1//==========================================================================
2//
3//      net/timers.c
4//
5//      Stand-alone networking support for RedBoot
6//
7//==========================================================================
8//####ECOSGPLCOPYRIGHTBEGIN####
9// -------------------------------------------
10// This file is part of eCos, the Embedded Configurable Operating System.
11// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
12//
13// eCos is free software; you can redistribute it and/or modify it under
14// the terms of the GNU General Public License as published by the Free
15// Software Foundation; either version 2 or (at your option) any later version.
16//
17// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
18// WARRANTY; without even the implied warranty of MERCHANTABILITY or
19// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
20// for more details.
21//
22// You should have received a copy of the GNU General Public License along
23// with eCos; if not, write to the Free Software Foundation, Inc.,
24// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25//
26// As a special exception, if other files instantiate templates or use macros
27// or inline functions from this file, or you compile this file and link it
28// with other works to produce a work based on this file, this file does not
29// by itself cause the resulting work to be covered by the GNU General Public
30// License. However the source code for this file must still be made available
31// in accordance with section (3) of the GNU General Public License.
32//
33// This exception does not invalidate any other reasons why a work based on
34// this file might be covered by the GNU General Public License.
35//
36// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
37// at http://sources.redhat.com/ecos/ecos-license/
38// -------------------------------------------
39//####ECOSGPLCOPYRIGHTEND####
40//==========================================================================
41//#####DESCRIPTIONBEGIN####
42//
43// Author(s):    gthomas
44// Contributors: gthomas
45// Date:         2000-07-14
46// Purpose:     
47// Description: 
48//             
49// This code is part of RedBoot (tm).
50//
51//####DESCRIPTIONEND####
52//
53//==========================================================================
54
55#include <net/net.h>
56
57static timer_t *tmr_list;
58
59
60/*
61 * Set a timer. Caller is responsible for providing the timer_t struct.
62 */
63void
64__timer_set(timer_t *t, unsigned long delay,
65            tmr_handler_t handler, void *user_data)
66{
67    timer_t *p;
68
69    t->delay = delay;
70    t->start = MS_TICKS();
71    t->handler = handler;
72    t->user_data = user_data;
73
74    for (p = tmr_list; p; p = p->next)
75        if (p == t) {
76            return;
77        }
78
79    t->next = tmr_list;
80    tmr_list = t;
81}
82
83
84/*
85 * Remove a given timer from timer list.
86 */
87void
88__timer_cancel(timer_t *t)
89{
90    timer_t *prev, *p;
91
92    for (prev = NULL, p = tmr_list; p; prev = p, p = p->next)
93        if (p == t) {
94            if (prev)
95                prev->next = p->next;
96            else
97                tmr_list = p->next;
98            return;
99        }
100}
101
102
103/*
104 * Poll timer list for timer expirations.
105 */
106void
107__timer_poll(void)
108{
109    timer_t *prev, *t;
110
111    prev = NULL;
112    t = tmr_list;
113    while (t) {
114        if ((MS_TICKS_DELAY() - t->start) >= t->delay) {
115
116            /* remove it before calling handler */
117            if (prev)
118                prev->next = t->next;
119            else
120                tmr_list = t->next;
121            /* now, call the handler */
122            t->handler(t->user_data);
123           
124            /*
125             * handler may be time consuming, so start
126             * from beginning of list.
127             */
128            prev = NULL;
129            t = tmr_list;
130        } else {
131            prev = t;
132            t = t->next;
133        }
134    }
135}
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