[libc] Implement barriers for pthreads#148948

Merged

uzairnawaz merged 16 commits intollvm:mainfrom

uzairnawaz:pthread-barrier

Jul 28, 2025

Commits on Jul 10, 2025

Barrier class implemented; begin work on public functions
uzairnawaz
committed

Commits on Jul 18, 2025

Commits on Jul 24, 2025

make barrier linux-only for now as mutex/cndvars are only defined for it
uzairnawaz
committed

Commits on Jul 25, 2025

remove unnecesary braces
uzairnawaz
committed

Commits on Jul 28, 2025

remove extra header + force size of public barrier type to be exactly equal to internal class
uzairnawaz
committed