COND_SYNCHRONIZE_SCH(9)                   Driver Basics                   COND_SYNCHRONIZE_SCH(9)



NAME
       cond_synchronize_sched - Conditionally wait for an RCU-sched grace period

SYNOPSIS
       void cond_synchronize_sched(unsigned long oldstate);

ARGUMENTS
       oldstate
           return value from earlier call to get_state_synchronize_sched

DESCRIPTION
       If a full RCU-sched grace period has elapsed since the earlier call to
       get_state_synchronize_sched, just return. Otherwise, invoke synchronize_sched to wait for
       a full grace period.

       Yes, this function does not take counter wrap into account. But counter wrap is harmless.
       If the counter wraps, we have waited for more than 2 billion grace periods (and way more
       on a 64-bit system!), so waiting for one additional grace period should be just fine.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                   COND_SYNCHRONIZE_SCH(9)