[exec.sysctxrepl.general]

# 33 Execution control library [[exec]](./#exec)

## 33.16 Namespace system_context_replaceability [[exec.sysctxrepl]](exec.sysctxrepl#general)

### 33.16.1 General [exec.sysctxrepl.general]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/exec.tex#L8432)

Facilities in the system_context_replaceability namespace
allow users to replace the default implementation of parallel_scheduler[.](#1.sentence-1)