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SLEEPQUEUE(9): Fix absolute timeouts

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The FreeBSD kernel timeouts are always based on the uptime.  Thus, we
have to use the relative watchdog.  C_ABSOLUTE just means that the
timeout value is already an uptime value.

https://lists.freebsd.org/pipermail/freebsd-hackers/2017-February/050572.html
This commit is contained in:
Sebastian Huber 2017-02-22 11:49:33 +01:00
parent 2a5d001ddb
commit 5e093a5bcb
1 changed files with 24 additions and 5 deletions
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29
freebsd/sys/kern/subr_sleepqueue.c
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@ -448,20 +448,39 @@ sleepq_set_timeout_sbt(void *wchan, sbintime_t sbt, sbintime_t pr,
#else /* __rtems__ */
Per_CPU_Control *cpu_self;
Thread_Control *executing;
ISR_lock_Context lock_context;
ISR_lock_Context lock_context_2;
Watchdog_Header *header;
uint64_t expire;
cpu_self = _Thread_Dispatch_disable();
executing = _Per_CPU_Get_executing(cpu_self);
BSD_ASSERT(_Watchdog_Get_state(&executing->Timer.Watchdog) ==
WATCHDOG_INACTIVE);
if ((flags & C_ABSOLUTE) == 0) {
_Thread_Timer_insert_relative(executing, cpu_self, sleepq_timeout,
(Watchdog_Interval)((sbt + tick_sbt - 1) / tick_sbt));
_ISR_lock_ISR_disable_and_acquire(&executing->Timer.Lock, &lock_context);
header = &cpu_self->Watchdog.Header[PER_CPU_WATCHDOG_RELATIVE];
executing->Timer.header = header;
executing->Timer.Watchdog.routine = sleepq_timeout;
_Watchdog_Set_CPU(&executing->Timer.Watchdog, cpu_self);
_Watchdog_Per_CPU_acquire_critical(cpu_self, &lock_context_2);
if ((flags & C_ABSOLUTE) != 0) {
/*
* The FreeBSD uptime starts at one second, however, the
* relative watchdog ticks start at zero, see also TIMESEL().
*/
expire = (sbt - SBT_1S + tick_sbt - 1) / tick_sbt;
} else {
_Thread_Timer_insert_absolute(executing, cpu_self, sleepq_timeout,
_Watchdog_Ticks_from_sbintime(sbt));
expire = (sbt + tick_sbt - 1) / tick_sbt;
expire += cpu_self->Watchdog.ticks;
}
_Watchdog_Insert(header, &executing->Timer.Watchdog, expire);
_Watchdog_Per_CPU_release_critical(cpu_self, &lock_context_2);
_ISR_lock_Release_and_ISR_enable(&executing->Timer.Lock, &lock_context);
_Thread_Dispatch_direct(cpu_self);
#endif /* __rtems__ */
}