-/*
- * CFLAGS=-lpthread make pthread_msgqueue
- */
-
#include <pthread.h>
+#include <pthread_extra.h>
#include <time.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
-typedef struct pthread_mq_t {
- pthread_mutex_t lock;
- pthread_cond_t cond_readable;
- pthread_cond_t cond_writable;
- void * data;
- size_t msg_size;
- size_t msg_count;
- size_t msg_count_max;
- size_t head_idx;
- char * name;
-} pthread_mq_t;
-
bool pthread_mq_readable(pthread_mq_t *mq) { return (mq->msg_count > 0); }
bool pthread_mq_writable(pthread_mq_t *mq) { return (mq->msg_count < mq->msg_count_max); }
pthread_mutex_init(&mq->lock, NULL);
pthread_cond_init(&mq->cond_readable, NULL);
pthread_cond_init(&mq->cond_writable, NULL);
+ //pthread_mutexattr_setclock(&mq->lock, CLOCK_MONOTONIC);
mq->data = malloc(msg_size*msg_count_max);
mq->msg_size = msg_size;
mq->msg_count_max = msg_count_max;
if(pthread_mq_writable(mq)) pthread_cond_broadcast(&mq->cond_writable);
}
+size_t pthread_mq_waiting(pthread_mq_t *mq) {
+ return mq->msg_count;
+}
+
bool pthread_mq_reset(pthread_mq_t *mq) {
if(pthread_mutex_lock(&mq->lock)) return false;
mq->msg_count = 0;
return true;
}
-bool pthread_mq_send_generic(pthread_mq_t *mq, void * data, bool to_front, bool block, const struct timespec *restrict abs_timeout) {
+bool pthread_mq_send_generic(pthread_mq_t *mq, void * data, bool to_front, const struct timespec *restrict abs_timeout) {
+ //printf("S-Timed: %p\n", abs_timeout);
int ret;
//Lock queue
//Wait for queue to be in writable condition
while(!pthread_mq_writable(mq)) {
+ //printf("S+Timed: %p\n", abs_timeout);
if(abs_timeout == NULL) {
ret = pthread_cond_wait(&mq->cond_writable, &mq->lock);
} else {
+ //printf("STimed: %p\n", abs_timeout);
+ //assert(abs_timeout != NULL);
ret = pthread_cond_timedwait(&mq->cond_writable, &mq->lock, abs_timeout);
}
if(ret) {
return false;
}
}
- printf("Writable\n");
//Write data to queue
- size_t idx = ( ( mq->msg_count_max + mq->head_idx + (to_front?-1:mq->msg_count) ) % mq->msg_count_max );
+ size_t idx = ( ( mq->head_idx + (to_front?mq->msg_count_max-1:mq->msg_count) ) % mq->msg_count_max );
void *ptr = mq->data + (idx * mq->msg_size);
mq->msg_count++;
if(to_front) mq->head_idx = (mq->msg_count_max + mq->head_idx - 1) % mq->msg_count_max;
return true;
}
-int main() {
- pthread_mq_t myq;
- pthread_mq_init(&myq, 6, 5);
- pthread_mq_send_generic(&myq, "AHOJ1", false, true, NULL);
- pthread_mq_send_generic(&myq, "AHOJ2", false, true, NULL);
- pthread_mq_send_generic(&myq, "AHOJ3", true, true, NULL);
- pthread_mq_send_generic(&myq, "AHOJ4", true, true, NULL);
- pthread_mq_send_generic(&myq, "AHOJ5", false, true, NULL);
- //pthread_mq_send_generic(&myq, "AHOJ6", false, true, NULL);
-
- for(int i = 0; i<5; i++) {
- printf("%.6s\n", (char *)(myq.data+i*6));
+bool pthread_mq_receive_generic(pthread_mq_t *mq, void * data, bool peek, const struct timespec *restrict abs_timeout) {
+ int ret;
+
+ //Lock queue
+ if(pthread_mutex_timedlock(&mq->lock, abs_timeout)) return false;
+
+ //Wait for queue to be in readable condition
+ while(!pthread_mq_readable(mq)) {
+ if(abs_timeout == NULL) {
+ ret = pthread_cond_wait(&mq->cond_readable, &mq->lock);
+ } else {
+ //printf("RTimed: %p\n", abs_timeout);
+ //assert(abs_timeout != NULL);
+ ret = pthread_cond_timedwait(&mq->cond_readable, &mq->lock, abs_timeout);
+ }
+ if(ret) {
+ pthread_mutex_unlock(&mq->lock);
+ return false;
+ }
+ }
+
+ //Read data from queue
+ void *ptr = mq->data + (mq->head_idx * mq->msg_size);
+ memcpy(data, ptr, mq->msg_size);
+
+ //Delete data from queue if not peeking
+ if(!peek) {
+ mq->msg_count--;
+ mq->head_idx = (mq->head_idx+1) % mq->msg_count_max;
}
+
+ //Signal conditions and unlock
+ pthread_mq_cond(mq);
+ pthread_mutex_unlock(&mq->lock);
+ return true;
}