initial commit

1 files changed, 120 insertions, 0 deletions

diff --git a/code/msgq.c b/code/msgq.c
new file mode 100644
index 0000000..7f32b40
--- /dev/null
+++ b/code/msgq.c
@@ -0,0 +1,120 @@
+#include "core.h"
+
+#ifdef ECP_WITH_PTHREAD
+
+#include <sys/time.h>
+
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#define MAX(a,b) (((a)>(b))?(a):(b))
+
+#define MSG_NEXT(msgi, max_msgs)    ((msgi + 1) % max_msgs)
+
+static struct timespec *abstime_ts(struct timespec *ts, unsigned int msec) {
+    struct timeval tv;
+    uint64_t us_start;
+    
+    gettimeofday(&tv, NULL);
+    us_start = tv.tv_sec * (uint64_t) 1000000 + tv.tv_usec;
+    us_start += msec * 1000;
+    ts->tv_sec = us_start / 1000000;
+    ts->tv_nsec = (us_start % 1000000) * 1000;
+    return ts;
+}
+
+int ecp_conn_msgq_create(ECPConnection *conn) {
+    int i;
+    
+    for (i=0; i<ECP_MAX_PTYPE; i++) {
+        int rv = pthread_cond_init(&conn->msgq.cond[i], NULL);
+        if (rv) {
+            int j;
+
+            for (j=0; j<i; j++) {
+                pthread_cond_destroy(&conn->msgq.cond[j]);
+            }
+            return ECP_ERR;
+        }
+    }
+
+    return ECP_OK;
+}
+
+void ecp_conn_msgq_destroy(ECPConnection *conn) {
+    int i;
+    
+    for (i=0; i<ECP_MAX_PTYPE; i++) {
+        pthread_cond_destroy(&conn->msgq.cond[i]);
+    }
+}
+
+ssize_t ecp_conn_msgq_push(ECPConnection *conn, unsigned char *payload, size_t payload_size) {
+    ECPConnMsgQ *msgq = &conn->msgq;
+    unsigned short msg_idx = msgq->empty_idx;
+    unsigned short i;
+    unsigned short done = 0;
+    unsigned char ptype;
+    
+    if (payload_size == 0) return ECP_OK;
+
+    ptype = *payload;
+    payload++;
+    payload_size--;
+
+    if (ptype >= ECP_MAX_PTYPE) return ECP_ERR_MAX_PTYPE;
+    if (payload_size < ECP_MIN_MSG) return ECP_ERR_MIN_MSG;
+    
+    for (i=0; i<ECP_MAX_CONN_MSG; i++) {
+        if (!msgq->occupied[msg_idx]) {
+            ECPMessage *msg = &msgq->msg[msg_idx];
+            if (payload_size > 0) memcpy(msg->payload, payload, payload_size);
+            msg->size = payload_size;
+            if (msgq->r_idx[ptype] == msgq->w_idx[ptype]) pthread_cond_signal(&msgq->cond[ptype]);
+            msgq->msg_idx[ptype][msgq->w_idx[ptype]] = msg_idx;
+            msgq->w_idx[ptype] = MSG_NEXT(msgq->w_idx[ptype], ECP_MAX_CONN_MSG+1);
+
+            msgq->empty_idx = MSG_NEXT(msg_idx, ECP_MAX_CONN_MSG);
+            msgq->occupied[msg_idx] = 1;
+            done = 1;
+            break;
+        }
+        msg_idx = MSG_NEXT(msg_idx, ECP_MAX_CONN_MSG);
+    }
+    if (done) {
+        return payload_size+1;
+    } else {
+        return ECP_ERR_MAX_CONN_MSG;
+    }
+}
+
+ssize_t ecp_conn_msgq_pop(ECPConnection *conn, unsigned char ptype, unsigned char *payload, size_t payload_size, unsigned int timeout) {
+    ECPConnMsgQ *msgq = &conn->msgq;
+    ECPMessage *msg;
+    ssize_t rv = ECP_OK;
+    unsigned short msg_idx;
+
+    if (ptype >= ECP_MAX_PTYPE) return ECP_ERR_MAX_PTYPE;
+
+    if (msgq->r_idx[ptype] == msgq->w_idx[ptype]) {
+        if (timeout == -1) {
+            pthread_cond_wait(&msgq->cond[ptype], &conn->mutex);
+        } else {
+            struct timespec ts;
+            int _rv = pthread_cond_timedwait(&msgq->cond[ptype], &conn->mutex, abstime_ts(&ts, timeout));
+            if (_rv) rv = ECP_ERR_TIMEOUT;
+        }
+    }
+    if (!rv) {
+        msg_idx = msgq->msg_idx[ptype][msgq->r_idx[ptype]];
+        msgq->r_idx[ptype] = MSG_NEXT(msgq->r_idx[ptype], ECP_MAX_CONN_MSG+1);
+        msgq->occupied[msg_idx] = 0;
+        msg = &msgq->msg[msg_idx];
+        rv = msg->size;
+        if (rv >= 0) {
+            rv = MIN(payload_size, rv);
+            memcpy(payload, msg->payload, rv);
+        }
+    }
+    return rv;
+}
+
+#endif  /* ECP_WITH_PTHREAD */
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