Image Control Statements

Execution of an image control statement divides the execution sequence on an image into segments. The following are image control statements:

• The SYNC ALL statement

• The SYNC IMAGES statement

• The SYNC MEMORY statement

• An ALLOCATE or DEALLOCATE statement that has a coarray allocatable object

• The CRITICAL or END CRITICAL statement

• The LOCK or UNLOCK statement

• Any statement that completes execution of a block or procedure and which results in the implicit deallocation of a coarray

• The STOP statement

• The END statement of a main program

A SYNC MEMORY statement is executed for all image control statements except CRITICAL, END CRITICAL, LOCK, and UNLOCK.

During an execution of a statement that invokes more than one procedure, at most one invocation can cause execution of an image control statement other than CRITICAL or END CRITICAL.