/* *------------------------------------------------------------------ * svm_queue.h - shared-memory queues * * Copyright (c) 2009 Cisco and/or its affiliates. * Licensed 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. *------------------------------------------------------------------ */ #ifndef included_svm_queue_h #define included_svm_queue_h #include <pthread.h> typedef struct _svm_queue { pthread_mutex_t mutex; /* 8 bytes */ pthread_cond_t condvar; /* 8 bytes */ int head; int tail; volatile int cursize; int maxsize; int elsize; int consumer_pid; int signal_when_queue_non_empty; char data[0]; } svm_queue_t; typedef enum { /** * blocking call */ SVM_Q_WAIT = 0, /** * non-blocking call */ SVM_Q_NOWAIT, /** * blocking call, return on signal or time-out */ SVM_Q_TIMEDWAIT, } svm_q_conditional_wait_t; svm_queue_t *svm_queue_init (int nels, int elsize, int consumer_pid, int signal_when_queue_non_empty); void svm_queue_free (svm_queue_t * q); int svm_queue_add (svm_queue_t * q, u8 * elem, int nowait); int svm_queue_add2 (svm_queue_t * q, u8 * elem, u8 * elem2, int nowait); int svm_queue_sub (svm_queue_t * q, u8 * elem, svm_q_conditional_wait_t cond, u32 time); int svm_queue_sub2 (svm_queue_t * q, u8 * elem); void svm_queue_lock (svm_queue_t * q); void svm_queue_unlock (svm_queue_t * q); int svm_queue_is_full (svm_queue_t * q); int svm_queue_add_nolock (svm_queue_t * q, u8 * elem); int svm_queue_sub_raw (svm_queue_t * q, u8 * elem); /** * Add element to queue with mutex held * @param q queue * @param elem pointer element data to add */ void svm_queue_add_raw (svm_queue_t * q, u8 * elem); /* * DEPRECATED please use svm_queue_t instead */ typedef svm_queue_t unix_shared_memory_queue_t; #endif /* included_svm_queue_h */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */