| /* |
| * Copyright (c) 2013 Linux Box Corporation. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef WAIT_QUEUE_H |
| #define WAIT_QUEUE_H |
| |
| #include <errno.h> |
| #include <pthread.h> |
| #include <stdint.h> |
| #include <stdbool.h> |
| #include <misc/queue.h> |
| #include <reentrant.h> |
| |
| typedef struct wait_entry { |
| mutex_t mtx; |
| cond_t cv; |
| } wait_entry_t; |
| |
| #define Wqe_LFlag_None 0x0000 |
| #define Wqe_LFlag_WaitSync 0x0001 |
| #define Wqe_LFlag_SyncDone 0x0002 |
| |
| /* thread wait queue */ |
| typedef struct wait_q_entry { |
| uint32_t flags; |
| uint32_t waiters; |
| wait_entry_t lwe; /* left */ |
| wait_entry_t rwe; /* right */ |
| TAILQ_HEAD(we_tailq, waiter) waitq; |
| } wait_q_entry_t; |
| |
| static inline void init_wait_entry(wait_entry_t *we) |
| { |
| mutex_init(&we->mtx, NULL); |
| pthread_cond_init(&we->cv, NULL); |
| } |
| |
| static inline void destroy_wait_entry(wait_entry_t *we) |
| { |
| mutex_destroy(&we->mtx); |
| cond_destroy(&we->cv); |
| } |
| |
| static inline void init_wait_q_entry(wait_q_entry_t *wqe) |
| { |
| TAILQ_INIT(&wqe->waitq); |
| init_wait_entry(&wqe->lwe); |
| init_wait_entry(&wqe->rwe); |
| } |
| |
| static inline void thread_delay_ms(unsigned long ms) |
| { |
| struct timespec then = { |
| .tv_sec = ms / 1000, |
| .tv_nsec = ms % 1000000UL |
| }; |
| nanosleep(&then, NULL); |
| } |
| |
| #endif /* WAIT_QUEUE_H */ |