zclock(3)
CZMQ Manual - CZMQ/4.0.2
Name
zclock - millisecond clocks and delays
Synopsis
// This is a stable class, and may not change except for emergencies. It
// is provided in stable builds.
// Sleep for a number of milliseconds
CZMQ_EXPORT void
zclock_sleep (int msecs);
// Return current system clock as milliseconds. Note that this clock can
// jump backwards (if the system clock is changed) so is unsafe to use for
// timers and time offsets. Use zclock_mono for that instead.
CZMQ_EXPORT int64_t
zclock_time (void);
// Return current monotonic clock in milliseconds. Use this when you compute
// time offsets. The monotonic clock is not affected by system changes and
// so will never be reset backwards, unlike a system clock.
CZMQ_EXPORT int64_t
zclock_mono (void);
// Return current monotonic clock in microseconds. Use this when you compute
// time offsets. The monotonic clock is not affected by system changes and
// so will never be reset backwards, unlike a system clock.
CZMQ_EXPORT int64_t
zclock_usecs (void);
// Return formatted date/time as fresh string. Free using zstr_free().
// Caller owns return value and must destroy it when done.
CZMQ_EXPORT char *
zclock_timestr (void);
// Self test of this class.
CZMQ_EXPORT void
zclock_test (bool verbose);
Please add '@interface' section in './../src/zclock.c'.
Description
The zclock class provides essential sleep and system time functions, used to slow down threads for testing, and calculate timers for polling. Wraps the non-portable system calls in a simple portable API.
The Win32 Sleep() call defaults to 16ms resolution unless the system timer resolution is increased with a call to timeBeginPeriod() permitting 1ms granularity.
Example
From zclock_test method
int64_t start = zclock_time ();
zclock_sleep (10);
assert ((zclock_time () - start) >= 10);
start = zclock_mono ();
int64_t usecs = zclock_usecs ();
zclock_sleep (10);
assert ((zclock_mono () - start) >= 10);
assert ((zclock_usecs () - usecs) >= 10000);
char *timestr = zclock_timestr ();
if (verbose)
puts (timestr); free (timestr);
Authors
The czmq manual was written by the authors in the AUTHORS file.
Resources
Main web site:
Report bugs to the email <gro.qmorez.stsil|ved-qmorez#gro.qmorez.stsil|ved-qmorez>
Copyright
Copyright (c) the Contributors as noted in the AUTHORS file. This file is part of CZMQ, the high-level C binding for ØMQ: http://czmq.zeromq.org. This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/. LICENSE included with the czmq distribution.