/**************************************************************************** * sched/mqueue/mq_msgqalloc.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include "sched/sched.h" #include "mqueue/mqueue.h" /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: nxmq_alloc_msgq * * Description: * This function implements a part of the POSIX message queue open logic. * It allocates and initializes a struct mqueue_inode_s structure. * * Input Parameters: * attr - The mq_maxmsg attribute is used at the time that the message * queue is created to determine the maximum number of * messages that may be placed in the message queue. * pmsgq - This parameter is a address of a pointer * * Returned Value: * Zero (OK) is returned on success. Otherwise, a negated errno value is * returned to indicate the nature of the failure. * * EINVAL attr is NULL or either attr->mq_mqssize or attr->mq_maxmsg * have an invalid value * ENOSPC There is insufficient space for the creation of the new * message queue * ****************************************************************************/ int nxmq_alloc_msgq(FAR struct mq_attr *attr, FAR struct mqueue_inode_s **pmsgq) { FAR struct mqueue_inode_s *msgq; /* Check if the caller is attempting to allocate a message for messages * larger than the configured maximum message size. */ DEBUGASSERT((!attr || attr->mq_msgsize <= MQ_MAX_BYTES) && pmsgq); if ((attr && attr->mq_msgsize > MQ_MAX_BYTES) || !pmsgq) { return -EINVAL; } /* Allocate memory for the new message queue. */ msgq = (FAR struct mqueue_inode_s *) kmm_zalloc(sizeof(struct mqueue_inode_s)); if (msgq) { /* Initialize the new named message queue */ list_initialize(&msgq->msglist); if (attr) { msgq->maxmsgs = (int16_t)attr->mq_maxmsg; msgq->maxmsgsize = (int16_t)attr->mq_msgsize; } else { msgq->maxmsgs = MQ_MAX_MSGS; msgq->maxmsgsize = MQ_MAX_BYTES; } #ifndef CONFIG_DISABLE_MQUEUE_NOTIFICATION msgq->ntpid = INVALID_PROCESS_ID; #endif } else { return -ENOSPC; } *pmsgq = msgq; return OK; }