| 1 | #include <pthread.h> |
| 2 | #include <pthread_extra.h> |
| 3 | #include <time.h> |
| 4 | #include <string.h> |
| 5 | #include <stdio.h> |
| 6 | #include <stdbool.h> |
| 7 | #include <stdlib.h> |
| 8 | #include <assert.h> |
| 9 | |
| 10 | bool pthread_mq_readable(pthread_mq_t *mq) { return (mq->msg_count > 0); } |
| 11 | bool pthread_mq_writable(pthread_mq_t *mq) { return (mq->msg_count < mq->msg_count_max); } |
| 12 | |
| 13 | bool pthread_mq_init(pthread_mq_t *mq, size_t msg_size, size_t msg_count_max) { |
| 14 | pthread_mutex_init(&mq->lock, NULL); |
| 15 | pthread_cond_init(&mq->cond_readable, NULL); |
| 16 | pthread_cond_init(&mq->cond_writable, NULL); |
| 17 | //pthread_mutexattr_setclock(&mq->lock, CLOCK_MONOTONIC); |
| 18 | mq->data = malloc(msg_size*msg_count_max); |
| 19 | mq->msg_size = msg_size; |
| 20 | mq->msg_count_max = msg_count_max; |
| 21 | mq->msg_count = 0; |
| 22 | mq->head_idx = 0; |
| 23 | mq->name = NULL; |
| 24 | |
| 25 | if(((msg_size*msg_count_max) > 0) && mq->data == NULL) return false; |
| 26 | return true; |
| 27 | } |
| 28 | |
| 29 | void pthread_mq_free(pthread_mq_t *mq) { |
| 30 | free(mq->data); |
| 31 | } |
| 32 | |
| 33 | void pthread_mq_cond(pthread_mq_t *mq) { |
| 34 | if(pthread_mq_readable(mq)) pthread_cond_broadcast(&mq->cond_readable); |
| 35 | if(pthread_mq_writable(mq)) pthread_cond_broadcast(&mq->cond_writable); |
| 36 | } |
| 37 | |
| 38 | size_t pthread_mq_waiting(pthread_mq_t *mq) { |
| 39 | return mq->msg_count; |
| 40 | } |
| 41 | |
| 42 | size_t pthread_mq_vacant(pthread_mq_t *mq) { |
| 43 | return (mq->msg_count_max - mq->msg_count); |
| 44 | } |
| 45 | |
| 46 | bool pthread_mq_reset(pthread_mq_t *mq) { |
| 47 | if(pthread_mutex_lock(&mq->lock)) return false; |
| 48 | mq->msg_count = 0; |
| 49 | mq->head_idx = 0; |
| 50 | pthread_mq_cond(mq); |
| 51 | pthread_mutex_unlock(&mq->lock); |
| 52 | return true; |
| 53 | } |
| 54 | |
| 55 | bool pthread_mq_send_generic(pthread_mq_t *mq, void * data, pthread_mq_flags_t flags, const struct timespec *restrict abs_timeout) { |
| 56 | //printf("S-Timed: %p\n", abs_timeout); |
| 57 | int ret; |
| 58 | |
| 59 | //Lock queue |
| 60 | if(pthread_mutex_timedlock(&mq->lock, abs_timeout)) return false; |
| 61 | |
| 62 | //Wait for queue to be in writable condition |
| 63 | while(!pthread_mq_writable(mq)) { |
| 64 | //printf("S+Timed: %p\n", abs_timeout); |
| 65 | if(abs_timeout == NULL) { |
| 66 | ret = pthread_cond_wait(&mq->cond_writable, &mq->lock); |
| 67 | } else { |
| 68 | //printf("STimed: %p\n", abs_timeout); |
| 69 | //assert(abs_timeout != NULL); |
| 70 | ret = pthread_cond_timedwait(&mq->cond_writable, &mq->lock, abs_timeout); |
| 71 | } |
| 72 | if(ret) { |
| 73 | pthread_mutex_unlock(&mq->lock); |
| 74 | return false; |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | //Handle overwrite |
| 79 | assert(!(flags & PTHREAD_XMQ_OVERW) && "FIXME: Overwrite not implemented yet!"); |
| 80 | |
| 81 | //Write data to queue |
| 82 | bool to_front = (flags & PTHREAD_XMQ_FRONT); |
| 83 | size_t idx = ( ( mq->head_idx + (to_front?mq->msg_count_max-1:mq->msg_count) ) % mq->msg_count_max ); |
| 84 | void *ptr = mq->data + (idx * mq->msg_size); |
| 85 | mq->msg_count++; |
| 86 | if(to_front) mq->head_idx = (mq->msg_count_max + mq->head_idx - 1) % mq->msg_count_max; |
| 87 | memcpy(ptr, data, mq->msg_size); |
| 88 | |
| 89 | //Signal conditions and unlock |
| 90 | pthread_mq_cond(mq); |
| 91 | pthread_mutex_unlock(&mq->lock); |
| 92 | return true; |
| 93 | } |
| 94 | |
| 95 | bool pthread_mq_receive_generic(pthread_mq_t *mq, void * data, pthread_mq_flags_t flags, const struct timespec *restrict abs_timeout) { |
| 96 | int ret; |
| 97 | |
| 98 | //Lock queue |
| 99 | if(pthread_mutex_timedlock(&mq->lock, abs_timeout)) return false; |
| 100 | |
| 101 | //Wait for queue to be in readable condition |
| 102 | while(!pthread_mq_readable(mq)) { |
| 103 | if(abs_timeout == NULL) { |
| 104 | ret = pthread_cond_wait(&mq->cond_readable, &mq->lock); |
| 105 | } else { |
| 106 | //printf("RTimed: %p\n", abs_timeout); |
| 107 | //assert(abs_timeout != NULL); |
| 108 | ret = pthread_cond_timedwait(&mq->cond_readable, &mq->lock, abs_timeout); |
| 109 | } |
| 110 | if(ret) { |
| 111 | pthread_mutex_unlock(&mq->lock); |
| 112 | return false; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | //Read data from queue |
| 117 | void *ptr = mq->data + (mq->head_idx * mq->msg_size); |
| 118 | memcpy(data, ptr, mq->msg_size); |
| 119 | |
| 120 | //Delete data from queue if not peeking |
| 121 | bool peek = (flags & PTHREAD_XMQ_PEEK); |
| 122 | if(!peek) { |
| 123 | mq->msg_count--; |
| 124 | mq->head_idx = (mq->head_idx+1) % mq->msg_count_max; |
| 125 | } |
| 126 | |
| 127 | //Signal conditions and unlock |
| 128 | pthread_mq_cond(mq); |
| 129 | pthread_mutex_unlock(&mq->lock); |
| 130 | return true; |
| 131 | } |