1 /*
2 * Copyright (c) 2020 Nanjing Xiaoxiongpai Intelligent Technology 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 "cmsis_os2.h"
21 #include "ohos_init.h"
22
23 osSemaphoreId_t g_semaphoreId;
24
25 #define THREAD_STACK_SIZE (1024 * 4)
26 #define THREAD_PRIO 24
27
28 #define THREAD_DELAY_1S 100
29 #define THREAD_DELAY_10MS 1
30
31 #define SEM_MAX_COUNT 4
32
Semaphore1Thread(void)33 void Semaphore1Thread(void)
34 {
35 while (1) {
36 // release Semaphores twice so that Semaphore2Thread and Semaphore3Thread can execute synchronously
37 osSemaphoreRelease(g_semaphoreId);
38
39 // if the Semaphore is released only once, Semaphore2Thread and Semaphore3Thread will run alternately.
40 osSemaphoreRelease(g_semaphoreId);
41
42 printf("Semaphore1Thread Release Semap \n");
43 osDelay(THREAD_DELAY_1S);
44 }
45 }
Semaphore2Thread(void)46 void Semaphore2Thread(void)
47 {
48 while (1) {
49 // wait Semaphore
50 osSemaphoreAcquire(g_semaphoreId, osWaitForever);
51
52 printf("Semaphore2Thread get Semap \n");
53 osDelay(THREAD_DELAY_10MS);
54 }
55 }
56
Semaphore3Thread(void)57 void Semaphore3Thread(void)
58 {
59 while (1) {
60 // wait Semaphore
61 osSemaphoreAcquire(g_semaphoreId, osWaitForever);
62
63 printf("Semaphore3Thread get Semap \n");
64 osDelay(THREAD_DELAY_10MS);
65 }
66 }
67
68 /**
69 * @brief Main Entry of the Semaphore Example
70 *
71 */
SemaphoreExample(void)72 void SemaphoreExample(void)
73 {
74 osThreadAttr_t attr;
75
76 attr.attr_bits = 0U;
77 attr.cb_mem = NULL;
78 attr.cb_size = 0U;
79 attr.stack_mem = NULL;
80 attr.stack_size = THREAD_STACK_SIZE;
81 attr.priority = THREAD_PRIO;
82
83 attr.name = "Semaphore1Thread";
84 if (osThreadNew((osThreadFunc_t)Semaphore1Thread, NULL, &attr) == NULL) {
85 printf("Failed to create Semaphore1Thread!\n");
86 }
87
88 attr.name = "Semaphore2Thread";
89 if (osThreadNew((osThreadFunc_t)Semaphore2Thread, NULL, &attr) == NULL) {
90 printf("Failed to create Semaphore2Thread!\n");
91 }
92
93 attr.name = "Semaphore3Thread";
94 if (osThreadNew((osThreadFunc_t)Semaphore3Thread, NULL, &attr) == NULL) {
95 printf("Failed to create Semaphore3Thread!\n");
96 }
97
98 g_semaphoreId = osSemaphoreNew(SEM_MAX_COUNT, 0, NULL);
99 if (g_semaphoreId == NULL) {
100 printf("Failed to create Semaphore!\n");
101 }
102 }
103 APP_FEATURE_INIT(SemaphoreExample);
104