Commit | Line | Data |
---|---|---|
90c3a0d4 TM |
1 | /* |
2 | * CFLAGS=-lpthread make pthread_msgqueue | |
3 | */ | |
4 | ||
5 | #include <pthread.h> | |
6 | #include <time.h> | |
7 | #include <string.h> | |
8 | #include <stdio.h> | |
9 | #include <stdbool.h> | |
10 | #include <stdlib.h> | |
11 | ||
12 | typedef struct pthread_mq_t { | |
13 | static pthread_mutex_t lock; | |
14 | static pthread_cond_t cond_readable; | |
15 | static pthread_cond_t cond_writable; | |
16 | void * data; | |
17 | size_t msg_size; | |
18 | size_t msg_count; | |
19 | size_t msg_count_max; | |
20 | size_t head_idx; | |
21 | char * name; | |
22 | } pthread_mq_t; | |
23 | ||
24 | bool pthread_mq_readable(pthread_mq_t *mq) { return (mq->count > 0); } | |
25 | bool pthread_mq_writable(pthread_mq_t *mq) { return (mq->count < mq->count_max); } | |
26 | ||
27 | bool pthread_mq_init(pthread_mq_t *mq, size_t msg_size, size_t msg_count_max) { | |
28 | mq->lock = PTHREAD_MUTEX_INITIALIZER; | |
29 | mq->cond_readable = PTHREAD_COND_INITIALIZER; | |
30 | mq->cond_writable = PTHREAD_COND_INITIALIZER; | |
31 | mq->data = malloc(msg_size*msg_count_max); | |
32 | mq->msg_size = msg_size; | |
33 | mq->msg_count_max = msg_count_max; | |
34 | mq->msg_count = 0; | |
35 | mq->head_idx = 0; | |
36 | mq->name = NULL; | |
37 | ||
38 | if(((msg_size*msg_count_max) > 0) && mq->data == NULL) return false; | |
39 | return true; | |
40 | } | |
41 | ||
42 | void pthread_mq_free(pthread_mq_t *mq) { | |
43 | free(mq->data); | |
44 | } | |
45 | ||
46 | ||
47 | void pthread_mq_cond(pthread_mq_t *mq) { | |
48 | if(pthread_mq_readable(mq)) pthread_cond_broadcast(&mq->cond_readable); | |
49 | if(pthread_mq_writable(mq)) pthread_cond_broadcast(&mq->cond_writable); | |
50 | } | |
51 | ||
52 | bool pthread_mq_send_generic(pthread_mq_t *mq, void * data, bool to_front, bool block, const struct timespec *restrict abs_timeout) { | |
53 | pthread_mutex_timedlock(&mq->lock, abs_timeout); | |
54 | ||
55 | while(!pthread_mq_writable(mq)) { | |
56 | pthread_mutex_unlock(&mq->lock); | |
57 | return false; | |
58 | } | |
59 | ||
60 | size_t idx = ( ( mq->count_max + mq->head_idx + (to_front?-1:mq->count) ) % mq->count_max ); | |
61 | void *ptr = mq->data + (idx * mq->msg_size); | |
62 | mq->msg_count++; | |
63 | memcpy(ptr, data, mq->msg_size); | |
64 | ||
65 | pthread_mq_cond(mq); | |
66 | pthread_mutex_unlock(&mq->lock); | |
67 | return true; | |
68 | } | |
69 | ||
70 | /* | |
71 | mq_timedreceive(3) mq_timedreceive(2) | |
72 | ||
73 | mq_timedsend(3) mq_timedsend(2) | |
74 | ||
75 | void vQueueDelete( QueueHandle_t xQueue ); | |
76 | BaseType_t xQueueReset( QueueHandle_t xQueue ); | |
77 | ||
78 | BaseType_t xQueueSend( | |
79 | QueueHandle_t xQueue, | |
80 | const void * pvItemToQueue, | |
81 | TickType_t xTicksToWait | |
82 | ); | |
83 | BaseType_t xQueueReceive( | |
84 | QueueHandle_t xQueue, | |
85 | void *pvBuffer, | |
86 | TickType_t xTicksToWait | |
87 | ); | |
88 | ||
89 | */ | |
90 | ||
91 | int main() { | |
92 | ||
93 | } |