1 /*
2 * Copyright (c) 2022 Talkweb Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include <stdio.h>
17 #include <string.h>
18 #include <unistd.h>
19
20 #include "ohos_run.h"
21 #include "cmsis_os2.h"
22
23 osMutexId_t mutex_id;
24
firstThread(void)25 void firstThread(void)
26 {
27 osDelay(100U);
28 while (1) {
29 osMutexAcquire(mutex_id, osWaitForever);
30 printf("firstThread is Acquire.\r\n");
31 osDelay(1000U);
32 osMutexRelease(mutex_id);
33 }
34 }
35
twoThread(void)36 void twoThread(void)
37 {
38 osDelay(1000U);
39 while (1) {
40 printf("twoThread is Acquire.\r\n");
41 osDelay(1000U);
42 }
43 }
44
threeThread(void)45 void threeThread(void)
46 {
47 while (1) {
48 osMutexAcquire(mutex_id, osWaitForever);
49 printf("threeThread is Acquire.\r\n");
50 osDelay(3000U);
51 osMutexRelease(mutex_id);
52 }
53 }
54
os_mutex_example(void)55 void os_mutex_example(void)
56 {
57 osThreadAttr_t attr;
58
59 attr.attr_bits = 0U;
60 attr.cb_mem = NULL;
61 attr.cb_size = 0U;
62 attr.stack_mem = NULL;
63 attr.stack_size = 1024 * 4;
64
65 attr.name = "firstThread";
66 attr.priority = 26;
67 if (osThreadNew((osThreadFunc_t)firstThread, NULL, &attr) == NULL) {
68 printf("create firstThread failed!\n");
69 }
70
71 attr.name = "twoThread";
72 attr.priority = 25;
73 if (osThreadNew((osThreadFunc_t)twoThread, NULL, &attr) == NULL) {
74 printf("create twoThread failed!\n");
75 }
76
77 attr.name = "threeThread";
78 attr.priority = 24;
79 if (osThreadNew((osThreadFunc_t)threeThread, NULL, &attr) == NULL) {
80 printf("create threeThread failed!\n");
81 }
82
83 mutex_id = osMutexNew(NULL);
84 if (mutex_id == NULL) {
85 printf("create Mutex failed!\n");
86 }
87 }
88
89 OHOS_APP_RUN(os_mutex_example);
90