CZMQ Manual - CZMQ/3.0.1
zclock - millisecond clocks and delays
// 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);
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.
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);
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