From Cppreference
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template< class Lockable1, class Lockable2, class LockableN... > int try_lock( Lockable1& lock1, Lockable2& lock2, LockableN lockn... );
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(C++11 feature)
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Tries to lock each of the given lockable objects lock1, lock2, ..., lockn by calling try_lock() in order beginning at the first. If a call to try_lock() fails, unlock() is called for any locked objects and a 0-based index of the object that failed to lock, is returned.
If a call to try_lock() results in an exception, unlock() is called for any locked objects before rethrowing.
[edit] Parameters
lock1, lock2, ... , lockn
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the lockable objects to lock
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[edit] Return value
-1 on success or 0-based index value of the object that failed to lock.
[edit] Example
[edit] See also
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locks specified mutexes/locks, blocks if at least one is unavailable (function template)
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