Duncan Coutts pushed to branch wip/io-manager-deadlock-detection at Glasgow Haskell Compiler / GHC

Commits:

• ecf70089
  by Duncan Coutts at 2026-02-12T22:53:53+00:00

  FIXUP     Add wakeupIOManager support for select I/O manager
  

• d4fa6e0e
  by Duncan Coutts at 2026-02-12T22:54:21+00:00

  FIXUP     Add wakeupIOManager support for poll I/O manager
  

• 731729ec
  by Duncan Coutts at 2026-02-12T22:55:07+00:00

  FIXUP: remove now-unused HAVE_EVENTFD_H and #includes
  

• 0810b12f
  by Duncan Coutts at 2026-02-12T22:58:13+00:00

  FIXME: turns out we do not need the bool after_fork. Simplify and rebase.
  

5 changed files:

• rts/IOManager.h
• rts/posix/MIO.c
• rts/posix/Poll.c
• rts/posix/Select.c
• rts/posix/Signals.c

Changes:

  */

 void freeCapabilityIOManager(CapIOManager *iomgr, bool after_fork);

+// FIXME: turns out we do not need the bool after_fork. Simplify and rebase.

+

 /* CapIOManager life cycle:

  *

  * alloc -> init -> free -> free struct (!after_fork)

 # include <errno.h>

 #endif

-#if defined(HAVE_EVENTFD_H)

-# include <sys/eventfd.h>

-#endif

-

 #include <stdlib.h>

 #include <unistd.h>

 void freeCapabilityIOManagerPoll(CapIOManager *iomgr, bool after_fork)

 {

     stgFree(iomgr->full_poll_table);

-    if (!after_fork) {

-        closeFdWakeup(iomgr->wakeup_fd_r, iomgr->wakeup_fd_w);

-    }

+    closeFdWakeup(iomgr->wakeup_fd_r, iomgr->wakeup_fd_w);

 }

 void freeCapabilityIOManagerSelect(CapIOManager *iomgr, bool after_fork)

 {

-    if (!after_fork) {

-        closeFdWakeup(iomgr->wakeup_fd_r, iomgr->wakeup_fd_w);

-    }

+    closeFdWakeup(iomgr->wakeup_fd_r, iomgr->wakeup_fd_w);

 }

 void wakeupIOManagerSelect(CapIOManager *iomgr)

 # include <errno.h>

 #endif

-#if defined(HAVE_EVENTFD_H)

-# include <sys/eventfd.h>

-#endif

-

 #if defined(HAVE_TERMIOS_H)

 #include <termios.h>

 #endif