Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

ID 767251
Date 3/22/2024
Public

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SYNC ALL

Statement: Performs a synchronization of all images on the current team.

The SYNC ALL statement takes the following form:

SYNC ALL[([STAT=stat-var][, ERRMSG=err-var])]

stat-var

Is a scalar integer variable in which the status of the synchronization is stored.

err-var

Is a scalar default character variable in which an error condition is stored if such a condition occurs.

STAT= and ERRMSG= can appear in either order, but only once in a SYNC ALL statement.

Description

Execution on an image, for example, C, of the segment following the SYNC ALL statement is delayed until each other image has executed a SYNC ALL statement as many times as has image C.

The segments that executed before the SYNC ALL statement on an image, precede the segments that execute after the SYNC ALL statement on another image.

Example

In the following example, image 5 reads data and transmits the data to other images:

REAL :: W[*]
SYNC ALL
IF (THIS_IMAGE()==5) THEN
   READ (*,*) W
   DO I = 6, NUM_IMAGES()
      W[I] = W
   END DO
END IF
...
SYNC ALL