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utest_scheduler.h
1 
2 /** \addtogroup frameworks */
3 /** @{*/
4 /****************************************************************************
5  * Copyright (c) 2015, ARM Limited, All Rights Reserved
6  * SPDX-License-Identifier: Apache-2.0
7  *
8  * Licensed under the Apache License, Version 2.0 (the "License"); you may
9  * not use this file except in compliance with the License.
10  * You may obtain a copy of the License at
11  *
12  * http://www.apache.org/licenses/LICENSE-2.0
13  *
14  * Unless required by applicable law or agreed to in writing, software
15  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
16  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17  * See the License for the specific language governing permissions and
18  * limitations under the License.
19  ****************************************************************************
20  */
21 
22 #ifndef UTEST_SCHEDULER_H
23 #define UTEST_SCHEDULER_H
24 
25 #include "hal/ticker_api.h"
26 #include <stdint.h>
27 #include <stdbool.h>
28 #include <stdio.h>
29 
30 #ifdef __cplusplus
31 extern "C" {
32 #endif
33 
34 /**
35  * The utest harness manages its own state and therefore does not require the scheduler to
36  * bind any arguments to the scheduled callback.
37  */
38 typedef void (*utest_v1_harness_callback_t)(void);
39 
40 /**
41  * utest calls this function before running the test specification.
42  * Use this function to initialize your scheduler before the first callback is requested.
43  *
44  * @retval `0` if success
45  * @retval non-zero if failure
46  */
47 typedef int32_t (*utest_v1_scheduler_init_callback_t)(void);
48 
49 /**
50  * utest calls this function when it needs to schedule a callback with a delay in milliseconds.
51  * `delay_ms` will only be non-zero if an asynchronous test case exists in the test specification.
52  * @note If your scheduler cannot provide asynchronous callbacks (which probably require a hardware timer),
53  * then this scheduler may return `NULL` as a handle and `utest` will fail the asynchronous request and move on.
54  * Note that test cases which do not require asynchronous callback support will still work fine then.
55  *
56  * @warning You MUST NOT execute the callback inside this function, even for a delay of 0ms.
57  * Buffer the callback and call it in your main loop.
58  * @warning You MUST NOT execute the callback in an interrupt context!
59  * Buffer the callback and call it in your main loop.
60  * @note utest only schedules one callback at any given time.
61  * This should make the implementation of this scheduler a lot simpler for you.
62  *
63  * @param callback the pointer to the callback function
64  * @param delay_ms the delay in milliseconds after which the callback should be executed
65  * @return A handle to identify the scheduled callback, or `NULL` for failure.
66  */
67 typedef void *(*utest_v1_scheduler_post_callback_t)(const utest_v1_harness_callback_t callback, timestamp_t delay_ms);
68 
69 /**
70  * utest needs to cancel callbacks with a non-zero delay some time later.
71  * Even though `utest` only schedules one callback at any given time, it can cancel a callback more than once.
72  * You should therefore make use of the handle to make sure you do not cancel the wrong callback.
73  *
74  * @note If your scheduler cannot provide asynchronous callbacks, do nothing in this function and return non-zero.
75  *
76  * @param handle the handle returned from the `post` call to identify which callback to be cancelled.
77  * @retval `0` if success
78  * @retval non-zero if failure
79  */
80 typedef int32_t (*utest_v1_scheduler_cancel_callback_t)(void *handle);
81 
82 /**
83  * utest calls this function at the end of the `Harness::run()` function, after (!) the first callback has been requested.
84  * This function is meant to implement an optional event loop, which may very well be blocking (if your scheduler works with that).
85  * This assumes that `Harness::run()` will be called on the main stack (ie. not in an interrupt!).
86  *
87  * @retval `0` if success
88  * @retval non-zero if failure
89  */
90 typedef int32_t (*utest_v1_scheduler_run_callback_t)(void);
91 
92 /**
93  * The scheduler interface consists out of the `post` and `cancel` functions,
94  * which you must implement to use `utest`.
95  */
96 typedef struct {
97  utest_v1_scheduler_init_callback_t init;
98  utest_v1_scheduler_post_callback_t post;
99  utest_v1_scheduler_cancel_callback_t cancel;
100  utest_v1_scheduler_run_callback_t run;
101 } utest_v1_scheduler_t;
102 
103 #ifdef __cplusplus
104 }
105 #endif
106 
107 #endif // UTEST_SCHEDULER_H
108 
109 /** @}*/
utest_v1_scheduler_run_callback_t
int32_t(* utest_v1_scheduler_run_callback_t)(void)
utest calls this function at the end of the Harness::run() function, after (!) the first callback has...
Definition: utest_scheduler.h:90
utest_v1_scheduler_t
The scheduler interface consists out of the post and cancel functions, which you must implement to us...
Definition: utest_scheduler.h:96
utest_v1_scheduler_cancel_callback_t
int32_t(* utest_v1_scheduler_cancel_callback_t)(void *handle)
utest needs to cancel callbacks with a non-zero delay some time later.
Definition: utest_scheduler.h:80
utest_v1_scheduler_post_callback_t
void *(* utest_v1_scheduler_post_callback_t)(const utest_v1_harness_callback_t callback, timestamp_t delay_ms)
utest calls this function when it needs to schedule a callback with a delay in milliseconds.
Definition: utest_scheduler.h:67
utest_v1_harness_callback_t
void(* utest_v1_harness_callback_t)(void)
The utest harness manages its own state and therefore does not require the scheduler to bind any argu...
Definition: utest_scheduler.h:38
mbed::callback
Callback< R(ArgTs...)> callback(R(*func)(ArgTs...)=0)
Create a callback class with type inferred from the arguments.
Definition: Callback.h:709
timestamp_t
uint32_t timestamp_t
Legacy format representing a timestamp in us.
Definition: ticker_api.h:33
utest_v1_scheduler_init_callback_t
int32_t(* utest_v1_scheduler_init_callback_t)(void)
utest calls this function before running the test specification.
Definition: utest_scheduler.h:47
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