It was also popular in the Shards of Alara block to see green, white, and blue Angels from the Shard of Bant. Also, in the Alara Reborn set, Filigree Angel was a white and blue artifact creature. The most known Angel in Magic is Akroma, Angel of Wrath. Released in the Onslaught expansion, Akroma was created by master illusionist Ixidor to fight Phage the Untouchable and the Cabal.
Deadlocks are sometimes called a deadly embrace. Deadlock is a condition that can occur on any system with multiple threads, not just on a relational database management system, and can occur for resources other than locks on database objects. For example, a thread in a multithreaded operating system might acquire one or more resources, such as blocks of memory.
For other uses, see Deadlock (disambiguation). Both processes need resources to continue execution. P1 requires additional resource R1 and is in possession of resource R2, P2 requires additional resource R2 and is in possession of R1; neither process can continue. Four processes (blue lines) compete for one resource (grey circle), following a right-before-left policy. A deadlock occurs when all processes lock the resource simultaneously (black lines). The deadlock can be resolved by breaking the symmetry.