CODEWITHSUNDEEP
javasynchronization
Steve Waring
Steve Waring

Reputation: 3033

Does synchronized if apply to whole block

This is not a question about method synchronisation, only to statement synchronisation. Please do not incorrectly mark as duplicate.

Is this code:

synchronized (this) if (something)
{
    somecode();
    somemorecode();
}

equivalent to this code:

if (something)
{
    synchronized (this)
    {
        somecode();
        somemorecode();
    }
}

Upvotes: 0

Views: 40

Answers (1)

T.J. Crowder
T.J. Crowder

Reputation: 1075795

Is this code...equivalent to this code

No, it isn't. In your first example, the if test is might be inside the synchronized section. In your second example, the if is outside the synchronized section.

This is a syntax error:

synchronized (this) if (something)
{
    somecode();
    somemorecode();
}

synchronized requires a block, per JLS§14.19:

SynchronizedStatement:
synchronized ( Expression ) Block

If it were valid, it would probably be equivalent to:

synchronized (this)
{
    if (something)
    {
        somecode();
        somemorecode();
    }
}

...but that's pure speculation; if it's not defined by the JLS, who knows what it would be. :-)

Side note: It's synchronized, not syncronized or syncronised.

Upvotes: 2

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