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Two related changes to timing code:

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First, make absolute times unsigned.  This means that it's safe to 
depend on their overflow behaviour (which is undefined for signed 
integers).  This requires a little extra care in handling comparisons, 
but I think I've correctly adjusted them all.

Second, functions registered with schedule_timer() are guaranteed to be 
called with precisely the time that was returned by schedule_timer().  
Thus, it's only necessary to check these values for equality rather than 
doing risky range checks, so do that.

The timing code still does lots that's undefined, unnecessary, or just
wrong, but this is a good start.

[originally from svn r9667]
This commit is contained in:
Ben Harris
2012-09-18 21:42:48 +00:00
parent 41ad182710
commit d5836982e2
16 changed files with 88 additions and 61 deletions
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8
putty.h
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@ -1383,11 +1383,11 @@ char *get_random_data(int bytes); /* used in cmdgen.c */
* GETTICKCOUNT() and compare the result with the returned `next'
* value to find out how long you have to make your next wait().)
*/
typedef void (*timer_fn_t)(void *ctx, long now);
long schedule_timer(int ticks, timer_fn_t fn, void *ctx);
typedef void (*timer_fn_t)(void *ctx, unsigned long now);
unsigned long schedule_timer(int ticks, timer_fn_t fn, void *ctx);
void expire_timer_context(void *ctx);
int run_timers(long now, long *next);
void timer_change_notify(long next);
int run_timers(unsigned long now, unsigned long *next);
void timer_change_notify(unsigned long next);
/*
* Define no-op macros for the jump list functions, on platforms that