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Man Pages


Manual Reference Pages  -  ZCLOCK (3)

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NAME

zclock - millisecond clocks and delays

CONTENTS

SYNOPSIS

//  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(). CZMQ_EXPORT char * zclock_timestr (void);

// Self test of this class CZMQ_EXPORT void zclock_test (bool verbose);

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: \m[blue] \m[]

Report bugs to the email <\m[blue]zeromq-dev@lists.zeromq.org\m[][1]>

COPYRIGHT

Copyright (c) 1991-2012 iMatix Corporation -- http://www.imatix.com Copyright other contributors as noted in the AUTHORS file. This file is part of CZMQ, the high-level C binding for 0MQ: 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.

NOTES

1. zeromq-dev@lists.zeromq.org  mailto:zeromq-dev@lists.zeromq.org
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CZMQ 3&.0&.1 ZCLOCK (3) 06/01/2015

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