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Use a timer to avoid polling

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The timer will be fired asynchronously to handle
time management flags, while other threads are
searching.

This implementation uses a thread waiting on a
timed condition variable instead of real timers.
This approach allow to reduce platform dependant
code to a minimum and also is the most portable given
that timers libraries are very different among platforms
and also the best ones are not compatible with olds
Windows.

Also retire the now unused polling code.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-11-05 11:19:21 +01:00
parent 0095f423f2
commit d58176bfea
8 changed files with 149 additions and 96 deletions
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6
src/lock.h
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@@ -35,6 +35,7 @@ typedef pthread_cond_t WaitCondition;
# define cond_init(x) pthread_cond_init(x, NULL)
# define cond_signal(x) pthread_cond_signal(x)
# define cond_wait(x,y) pthread_cond_wait(x,y)
# define cond_timedwait(x,y,z) pthread_cond_timedwait(x,y,z)
#else
@@ -57,7 +58,8 @@ typedef CONDITION_VARIABLE WaitCondition;
# define cond_destroy(x) (x)
# define cond_init(x) InitializeConditionVariable(x)
# define cond_signal(x) WakeConditionVariable(x)
# define cond_wait(x,y) SleepConditionVariableSRW(x, y, INFINITE,0)
# define cond_wait(x,y) SleepConditionVariableSRW(x,y,INFINITE,0)
# define cond_timedwait(x,y,z) SleepConditionVariableSRW(x,y,z,0)
// Fallback solution to build for Windows XP and older versions, note that
// cond_wait() is racy between lock_release() and WaitForSingleObject().
@@ -74,6 +76,8 @@ typedef HANDLE WaitCondition;
# define cond_destroy(x) CloseHandle(*x)
# define cond_signal(x) SetEvent(*x)
# define cond_wait(x,y) { lock_release(y); WaitForSingleObject(*x, INFINITE); lock_grab(y); }
# define cond_timedwait(x,y,z) { lock_release(y); WaitForSingleObject(*x,z); lock_grab(y); }
#endif
#endif