v1.17.0

libxtc (1.17.0-1) unstable; urgency=medium

• ThreadSanitizer support for the cooperative-fiber runtime (requested
  by the PG-integration team). The coro substrates now emit the TSan
  fiber-IDENTITY API (__tsan_create_fiber / __tsan_switch_to_fiber /
  __tsan_destroy_fiber) under clang -fsanitize=thread, so TSan tracks
  per-fiber happens-before across cooperative switches instead of
  collapsing every coroutine into one confused thread. This is
  DISTINCT from and mutually exclusive with the ASan stack-switch
  annotations (v1.13.0): a TSan build emits only the identity calls,
  an ASan build only the stack-switch calls, so a TSan build no longer
  link-fails on __sanitizer_start_switch_fiber (which the TSan runtime
  does not provide). clang-only by design (gcc libtsan has no fiber
  support). A full clang TSan build runs the fiber suite
  (test_fctx/async/proc/svr/chan) with zero TSan warnings; a new CI
  job (tsan-fibers) keeps it green. Zero cost / zero symbols in a
  non-sanitized build.
• Test coverage: closed the documented io_common.c and svr.c
  branch-coverage gaps with targeted guard tests (io_init/fini/wakeup
  NULL guards, the live wakeup+coalesce path, and the xtc_svr
  start/stop/join/reply/call/cast XTC_E_INVAL edges).
• Docs: corrected the stale "CI not flipped to SUAR=1" caveat (flipped
  since v1.13.0); recorded that Windows multi-core scalability is not
  claimed and is gated behind the Win32-fiber-substrate fix.
• No public xtc_* API change from 1.16.0.

-- Greg Burd greg@burd.me Sun, 12 Jul 2026 10:06:55 -0400