rabbitmq-c  0.5.3
C AMQP Client library for RabbitMQ
amqp_timer.h
00001 /* vim:set ft=c ts=2 sw=2 sts=2 et cindent: */
00002 /*
00003  * Portions created by Alan Antonuk are Copyright (c) 2013-2014 Alan Antonuk.
00004  * All Rights Reserved.
00005  *
00006  * Permission is hereby granted, free of charge, to any person obtaining a
00007  * copy of this software and associated documentation files (the "Software"),
00008  * to deal in the Software without restriction, including without limitation
00009  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
00010  * and/or sell copies of the Software, and to permit persons to whom the
00011  * Software is furnished to do so, subject to the following conditions:
00012  *
00013  * The above copyright notice and this permission notice shall be included in
00014  * all copies or substantial portions of the Software.
00015  *
00016  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00017  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00018  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00019  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00020  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
00021  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
00022  * DEALINGS IN THE SOFTWARE.
00023  */
00024 #ifndef AMQP_TIMER_H
00025 #define AMQP_TIMER_H
00026 
00027 #include <stdint.h>
00028 
00029 #ifdef _WIN32
00030 # ifndef WINVER
00031 #  define WINVER 0x0502
00032 # endif
00033 # ifndef WIN32_LEAN_AND_MEAN
00034 #  define WIN32_LEAN_AND_MEAN
00035 # endif
00036 # include <Winsock2.h>
00037 #else
00038 # include <sys/time.h>
00039 #endif
00040 
00041 #define AMQP_MS_PER_S  1000
00042 #define AMQP_US_PER_MS 1000
00043 #define AMQP_NS_PER_S  1000000000
00044 #define AMQP_NS_PER_MS 1000000
00045 #define AMQP_NS_PER_US 1000
00046 
00047 #define AMQP_INIT_TIMER(structure) { \
00048   structure.current_timestamp = 0;   \
00049   structure.timeout_timestamp = 0;   \
00050 }
00051 
00052 typedef struct amqp_timer_t_ {
00053   uint64_t current_timestamp;
00054   uint64_t timeout_timestamp;
00055   uint64_t ns_until_next_timeout;
00056   struct timeval tv;
00057 } amqp_timer_t;
00058 
00059 /* Gets a monotonic timestamp in ns */
00060 uint64_t
00061 amqp_get_monotonic_timestamp(void);
00062 
00063 /* Prepare timeout value and modify timer state based on timer state. */
00064 int
00065 amqp_timer_update(amqp_timer_t *timer, struct timeval *timeout);
00066 
00067 #endif /* AMQP_TIMER_H */
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