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Merge pull request #2943 from MartinNowak/useInitOnce

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use initOnce for lazy shared initialization
This commit is contained in:
Dmitry Olshansky 2015-06-26 20:51:14 +03:00
commit bcedffd0ee
3 changed files with 18 additions and 44 deletions
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11
std/concurrency.d
View file

@ -75,7 +75,6 @@ private
import core.sync.mutex;
import core.sync.condition;
import std.algorithm;
import std.datetime;
import std.exception;
import std.range;
import std.string;
@ -1373,11 +1372,12 @@ private:
override bool wait( Duration period ) nothrow
{
import core.time;
scope(exit) notified = false;
for( auto limit = Clock.currSystemTick + period;
for( auto limit = TickDuration.currSystemTick + period;
!notified && !period.isNegative;
period = limit - Clock.currSystemTick )
period = limit - TickDuration.currSystemTick )
{
yield();
}
@ -2047,7 +2047,8 @@ private
static if( timedWait )
{
auto limit = Clock.currSystemTick + period;
import core.time;
auto limit = TickDuration.currSystemTick + period;
}
while( true )
@ -2095,7 +2096,7 @@ private
{
static if( timedWait )
{
period = limit - Clock.currSystemTick;
period = limit - TickDuration.currSystemTick;
}
continue;
}

26
std/datetime.d
View file

@ -27333,31 +27333,15 @@ private:
}
static immutable LocalTime _localTime = new immutable(LocalTime)();
// Use low-lock singleton pattern with _tzsetWasCalled (see http://dconf.org/talks/simcha.html)
static bool _lowLock;
static shared bool _tzsetWasCalled;
// This is done so that we can maintain purity in spite of doing an impure
// operation the first time that LocalTime() is called.
static immutable(LocalTime) singleton() @trusted
{
if(!_lowLock)
{
synchronized
{
if(!_tzsetWasCalled)
{
tzset();
_tzsetWasCalled = true;
}
}
_lowLock = true;
}
return _localTime;
import std.concurrency : initOnce;
static instance = new immutable(LocalTime)();
static shared bool guard;
initOnce!guard({tzset(); return true;}());
return instance;
}
}

25
std/parallelism.d
View file

@ -3273,24 +3273,13 @@ terminating the main thread.
*/
@property TaskPool taskPool() @trusted
{
static bool initialized;
__gshared static TaskPool pool;
if(!initialized)
{
synchronized(typeid(TaskPool))
{
if(!pool)
{
pool = new TaskPool(defaultPoolThreads);
pool.isDaemon = true;
}
}
initialized = true;
}
return pool;
import std.concurrency : initOnce;
__gshared TaskPool pool;
return initOnce!pool({
auto p = new TaskPool(defaultPoolThreads);
p.isDaemon = true;
return p;
}());
}
private shared uint _defaultPoolThreads;