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git.gir.st - tmk_keyboard.git/blob - tmk_core/tool/mbed/mbed-sdk/libraries/rtos/rtx/TARGET_CORTEX_A/rt_Robin.c
1 /*----------------------------------------------------------------------------
3 *----------------------------------------------------------------------------
5 * Purpose: Round Robin Task switching
7 *----------------------------------------------------------------------------
9 * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
10 * All rights reserved.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions are met:
13 * - Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * - Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * - Neither the name of ARM nor the names of its contributors may be used
19 * to endorse or promote products derived from this software without
20 * specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 *---------------------------------------------------------------------------*/
35 #include "rt_TypeDef.h"
36 #include "RTX_Config.h"
42 #include "rt_HAL_CA.h"
44 #include "rt_HAL_CM.h"
47 /*----------------------------------------------------------------------------
49 *---------------------------------------------------------------------------*/
51 struct OS_ROBIN os_robin
;
54 /*----------------------------------------------------------------------------
56 *---------------------------------------------------------------------------*/
58 /*--------------------------- rt_init_robin ---------------------------------*/
60 __weak
void rt_init_robin (void) {
61 /* Initialize Round Robin variables. */
63 os_robin
.tout
= (U16
)os_rrobin
;
66 /*--------------------------- rt_chk_robin ----------------------------------*/
68 __weak
void rt_chk_robin (void) {
69 /* Check if Round Robin timeout expired and switch to the next ready task.*/
72 if (os_robin
.task
!= os_rdy
.p_lnk
) {
73 /* New task was suspended, reset Round Robin timeout. */
74 os_robin
.task
= os_rdy
.p_lnk
;
75 os_robin
.time
= (U16
)os_time
+ os_robin
.tout
- 1;
77 if (os_robin
.time
== (U16
)os_time
) {
78 /* Round Robin timeout has expired, swap Robin tasks. */
80 p_new
= rt_get_first (&os_rdy
);
81 rt_put_prio ((P_XCB
)&os_rdy
, p_new
);
85 /*----------------------------------------------------------------------------
87 *---------------------------------------------------------------------------*/