Ada Reference Manual (Ada 2022)
H.5 Pragma Detect_Blocking
The following pragma requires an implementation to detect potentially blocking operations during the execution of a protected operation or a parallel construct.
Syntax
The form of a pragma Detect_Blocking is as follows:
pragma Detect_Blocking;
Post-Compilation Rules
A pragma Detect_Blocking is a configuration pragma.
Dynamic Semantics
An implementation is required to detect a potentially blocking operation that occurs during the execution of a protected operation or a parallel construct defined within a compilation unit to which the pragma applies, and to raise Program_Error (see 9.5).
Implementation Permissions
An implementation is allowed to reject a compilation_unit to which a pragma Detect_Blocking applies if a potentially blocking operation is present directly within an entry_body, the body of a protected subprogram, or a parallel construct occurring within the compilation unit.
NOTE An operation that causes a task to be blocked within a foreign language domain is not defined to be potentially blocking, and is unlikely to be detected.
