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29 
30 #include <utils/Errors.h>
31 #include <utils/Log.h>
32 #include <sys/prctl.h>
33 #include "QCameraCmdThread.h"
34 
35 using namespace android;
36 
37 namespace qcamera {
38 
39 /*===========================================================================
40  * FUNCTION   : QCameraCmdThread
41  *
42  * DESCRIPTION: default constructor of QCameraCmdThread
43  *
44  * PARAMETERS : None
45  *
46  * RETURN     : None
47  *==========================================================================*/
QCameraCmdThread()48 QCameraCmdThread::QCameraCmdThread() :
49     cmd_queue()
50 {
51     cmd_pid = 0;
52     cam_sem_init(&sync_sem, 0);
53     cam_sem_init(&cmd_sem, 0);
54 }
55 
56 /*===========================================================================
57  * FUNCTION   : ~QCameraCmdThread
58  *
59  * DESCRIPTION: deconstructor of QCameraCmdThread
60  *
61  * PARAMETERS : None
62  *
63  * RETURN     : None
64  *==========================================================================*/
~QCameraCmdThread()65 QCameraCmdThread::~QCameraCmdThread()
66 {
67     cam_sem_destroy(&sync_sem);
68     cam_sem_destroy(&cmd_sem);
69 }
70 
71 /*===========================================================================
72  * FUNCTION   : launch
73  *
74  * DESCRIPTION: launch Cmd Thread
75  *
76  * PARAMETERS :
77  *   @start_routine : thread routine function ptr
78  *   @user_data     : user data ptr
79  *
80  * RETURN     : int32_t type of status
81  *              NO_ERROR  -- success
82  *              none-zero failure code
83  *==========================================================================*/
launch(void * (* start_routine)(void *),void * user_data)84 int32_t QCameraCmdThread::launch(void *(*start_routine)(void *),
85                                  void* user_data)
86 {
87     /* launch the thread */
88     pthread_create(&cmd_pid,
89                    NULL,
90                    start_routine,
91                    user_data);
92     return NO_ERROR;
93 }
94 
95 /*===========================================================================
96  * FUNCTION   : setName
97  *
98  * DESCRIPTION: name the cmd thread
99  *
100  * PARAMETERS :
101  *   @name : desired name for the thread
102  *
103  * RETURN     : int32_t type of status
104  *              NO_ERROR  -- success
105  *              none-zero failure code
106  *==========================================================================*/
setName(const char * name)107 int32_t QCameraCmdThread::setName(const char* name)
108 {
109     /* name the thread */
110     prctl(PR_SET_NAME, (unsigned long)name, 0, 0, 0);
111     return NO_ERROR;
112 }
113 
114 /*===========================================================================
115  * FUNCTION   : sendCmd
116  *
117  * DESCRIPTION: send a command to the Cmd Thread
118  *
119  * PARAMETERS :
120  *   @cmd     : command to be executed.
121  *   @sync_cmd: flag to indicate if this is a synchorinzed cmd. If true, this call
122  *              will wait until signal is set after the command is completed.
123  *   @priority: flag to indicate if this is a cmd with priority. If true, the cmd
124  *              will be enqueued to the head with priority.
125  *
126  * RETURN     : int32_t type of status
127  *              NO_ERROR  -- success
128  *              none-zero failure code
129  *==========================================================================*/
sendCmd(camera_cmd_type_t cmd,uint8_t sync_cmd,uint8_t priority)130 int32_t QCameraCmdThread::sendCmd(camera_cmd_type_t cmd, uint8_t sync_cmd, uint8_t priority)
131 {
132     camera_cmd_t *node = (camera_cmd_t *)malloc(sizeof(camera_cmd_t));
133     if (NULL == node) {
134         ALOGE("%s: No memory for camera_cmd_t", __func__);
135         return NO_MEMORY;
136     }
137     memset(node, 0, sizeof(camera_cmd_t));
138     node->cmd = cmd;
139 
140     if (priority) {
141         if (!cmd_queue.enqueueWithPriority((void *)node)) {
142             free(node);
143             node = NULL;
144         }
145     } else {
146         if (!cmd_queue.enqueue((void *)node)) {
147             free(node);
148             node = NULL;
149         }
150     }
151     cam_sem_post(&cmd_sem);
152 
153     /* if is a sync call, need to wait until it returns */
154     if (sync_cmd) {
155         cam_sem_wait(&sync_sem);
156     }
157     return NO_ERROR;
158 }
159 
160 /*===========================================================================
161  * FUNCTION   : getCmd
162  *
163  * DESCRIPTION: dequeue a cmommand from cmd queue
164  *
165  * PARAMETERS : None
166  *
167  * RETURN     : cmd dequeued
168  *==========================================================================*/
getCmd()169 camera_cmd_type_t QCameraCmdThread::getCmd()
170 {
171     camera_cmd_type_t cmd = CAMERA_CMD_TYPE_NONE;
172     camera_cmd_t *node = (camera_cmd_t *)cmd_queue.dequeue();
173     if (NULL == node) {
174         ALOGD("%s: No notify avail", __func__);
175         return CAMERA_CMD_TYPE_NONE;
176     } else {
177         cmd = node->cmd;
178         free(node);
179     }
180     return cmd;
181 }
182 
183 /*===========================================================================
184  * FUNCTION   : exit
185  *
186  * DESCRIPTION: exit the CMD thread
187  *
188  * PARAMETERS : None
189  *
190  * RETURN     : int32_t type of status
191  *              NO_ERROR  -- success
192  *              none-zero failure code
193  *==========================================================================*/
exit()194 int32_t QCameraCmdThread::exit()
195 {
196     int32_t rc = NO_ERROR;
197 
198     if (cmd_pid == 0) {
199         return rc;
200     }
201 
202     rc = sendCmd(CAMERA_CMD_TYPE_EXIT, 0, 1);
203     if (NO_ERROR != rc) {
204         ALOGE("%s: Error during exit, rc = %d", __func__, rc);
205         return rc;
206     }
207 
208     /* wait until cmd thread exits */
209     if (pthread_join(cmd_pid, NULL) != 0) {
210         ALOGD("%s: pthread dead already\n", __func__);
211     }
212     cmd_pid = 0;
213     return rc;
214 }
215 
216 }; // namespace qcamera
217