merge job rusage and pending reason support

src/lib/mylock.c

@@ -161,6 +161,30 @@ int cbuf_get(cbuf_t* b, void* it)
     return 0;
 }
 
+int cbuf_tryget(cbuf_t* b, void* it)
+{
+    int rc = 0;
+
+    if ((b == NULL) || (it == NULL)) {
+        return -EINVAL;
+    }
+
+    pthread_mutex_lock(&(b->mutex));
+    if (b->len == 0) {
+        rc = -EAGAIN;
+    } else {
+        memcpy(it, (void*)((char*)b->data) + b->isize * b->head, b->isize);
+
+        b->head = (b->head + 1) % b->ncap;
+        b->len--;
+
+        pthread_cond_signal(&(b->condput));
+    }
+    pthread_mutex_unlock(&(b->mutex));
+
+    return rc;
+}
+
 int my_rwlock_init(my_rwlock_t* l)
 {
     if (l == NULL) {