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timer: add timer_mod_anticipate and timer_mod_anticipate_ns

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These let a user anticipate the deadline of a timer, atomically with
other sites that call the function.  This helps avoiding complicated
lock hierarchies.

Reviewed-by: Alex Bligh <alex@alex.org.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2013-10-03 15:11:43 +02:00
parent 0f809e5fbe
commit add40e9777
2 changed files with 55 additions and 0 deletions
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26
include/qemu/timer.h
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@@ -544,6 +544,19 @@ void timer_del(QEMUTimer *ts);
*/
void timer_mod_ns(QEMUTimer *ts, int64_t expire_time);
/**
* timer_mod_anticipate_ns:
* @ts: the timer
* @expire_time: the expiry time in nanoseconds
*
* Modify a timer to expire at @expire_time or the current time,
* whichever comes earlier.
*
* This function is thread-safe but the timer and its timer list must not be
* freed while this function is running.
*/
void timer_mod_anticipate_ns(QEMUTimer *ts, int64_t expire_time);
/**
* timer_mod:
* @ts: the timer
@@ -557,6 +570,19 @@ void timer_mod_ns(QEMUTimer *ts, int64_t expire_time);
*/
void timer_mod(QEMUTimer *ts, int64_t expire_timer);
/**
* timer_mod_anticipate:
* @ts: the timer
* @expire_time: the expiry time in nanoseconds
*
* Modify a timer to expire at @expire_time or the current time, whichever
* comes earlier, taking into account the scale associated with the timer.
*
* This function is thread-safe but the timer and its timer list must not be
* freed while this function is running.
*/
void timer_mod_anticipate(QEMUTimer *ts, int64_t expire_time);
/**
* timer_pending:
* @ts: the timer