Acquires the device for the current thread. This function will
block until no other thread has acquired the device.
If no Exception is thrown, you successfully
acquired the device. From now on your thread owns the device
and no other thread will be able to acquire it until a matching
call to Device.release(). It is allowed to recursively
acquire the device multiple times from the same thread.
Note:
You must never acquire two different devices at the same time
unless this is explicitly allowed. Otherwise the possibility
of deadlocks exist.
As various Cairo functions can acquire devices when called,
these functions may also cause deadlocks when you call them
with an acquired device. So you must not have a device acquired
when calling them. These functions are marked in the documentation.
An exception if the device is in an error state and could not
be acquired. After a successful call to acquire, a matching call
to Device.release() is required.
Acquires the device for the current thread. This function will block until no other thread has acquired the device.
If no Exception is thrown, you successfully acquired the device. From now on your thread owns the device and no other thread will be able to acquire it until a matching call to Device.release(). It is allowed to recursively acquire the device multiple times from the same thread.
Note: You must never acquire two different devices at the same time unless this is explicitly allowed. Otherwise the possibility of deadlocks exist.
As various Cairo functions can acquire devices when called, these functions may also cause deadlocks when you call them with an acquired device. So you must not have a device acquired when calling them. These functions are marked in the documentation.