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Use atomics for async interrupts

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* libguile/__scm.h (SCM_TICK): Always define as scm_async_tick().
* libguile/error.c (scm_syserror, scm_syserror_msg):
* libguile/fports.c (fport_read, fport_write):
* libguile/_scm.h (SCM_SYSCALL): Replace SCM_ASYNC_TICK with
  scm_async_tick ().
  (SCM_ASYNC_TICK, SCM_ASYNC_TICK_WITH_CODE)
  (SCM_ASYNC_TICK_WITH_GUARD_CODE): Remove internal definitions.  We
  inline into vm-engine.c, the only place where it matters.
* libguile/async.h:
* libguile/async.c (scm_async_tick, scm_i_setup_sleep):
  (scm_i_reset_sleep, scm_system_async_mark_for_thread):
* libguile/threads.h (struct scm_thread_wake_data):
* libguile/threads.h (scm_i_thread):
* libguile/threads.c (block_self, guilify_self_1, scm_std_select):
  Rewrite to use sequentially-consistent atomic references.
* libguile/atomics-internal.h (scm_atomic_set_pointer):
  (scm_atomic_ref_pointer): New definitions.
* libguile/finalizers.c (queue_finalizer_async): We can allocate, so
  just use scm_system_async_mark_for_thread instead of the set-cdr!
  shenanigans.
* libguile/scmsigs.c (take_signal):
* libguile/gc.c (queue_after_gc_hook): Adapt to new asyncs mechanism.
  Can't allocate but we're just manipulating the current thread when no
  other threads are running so we should be good.
* libguile/vm-engine.c (VM_HANDLE_INTERRUPTS): Inline the async_tick
  business.
This commit is contained in:
Andy Wingo 2016-10-26 22:32:51 +02:00
parent f3bfe29235
commit c957ec7ab0
14 changed files with 152 additions and 192 deletions
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4
libguile/error.c
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@ -163,7 +163,7 @@ scm_syserror (const char *subr)
*/
#ifdef EINTR
if (scm_to_int (err) == EINTR)
SCM_ASYNC_TICK;
scm_async_tick ();
#endif
scm_error (scm_system_error_key,
@ -179,7 +179,7 @@ scm_syserror_msg (const char *subr, const char *message, SCM args, int eno)
/* See above note about the EINTR signal handling race. */
#ifdef EINTR
if (eno == EINTR)
SCM_ASYNC_TICK;
scm_async_tick ();
#endif
scm_error (scm_system_error_key,
subr,