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Remove thread held pthread_mutex field

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* libguile/threads.h (scm_i_thread):
* libguile/threads.c (guilify_self_1, on_thread_exit)
  (scm_pthread_cond_wait, scm_pthread_cond_timedwait): The thread-local
  held_mutex field is no longer needed, now that we cancel threads via
  interrupts instead of pthread_cancel.
This commit is contained in:
Andy Wingo 2016-11-05 00:22:15 +01:00
parent 857aa581a2
commit a3d0a7da4d
2 changed files with 2 additions and 26 deletions
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27
libguile/threads.c
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@ -411,7 +411,6 @@ guilify_self_1 (struct GC_stack_base *base)
t.pthread = scm_i_pthread_self ();
t.handle = SCM_BOOL_F;
t.result = SCM_BOOL_F;
t.held_mutex = NULL;
t.join_queue = SCM_EOL;
t.freelists = NULL;
t.pointerless_freelists = NULL;
@ -568,14 +567,6 @@ on_thread_exit (void *v)
it here. */
t->guile_mode = 0;
/* If this thread was cancelled while doing a cond wait, it will
still have a mutex locked, so we unlock it here. */
if (t->held_mutex)
{
scm_i_pthread_mutex_unlock (t->held_mutex);
t->held_mutex = NULL;
}
/* Reinstate the current thread for purposes of scm_with_guile
guile-mode cleanup handlers. Only really needed in the non-TLS
case but it doesn't hurt to be consistent. */
@ -1688,14 +1679,7 @@ scm_dynwind_pthread_mutex_lock (scm_i_pthread_mutex_t *mutex)
int
scm_pthread_cond_wait (scm_i_pthread_cond_t *cond, scm_i_pthread_mutex_t *mutex)
{
int res;
scm_i_thread *t = SCM_I_CURRENT_THREAD;
t->held_mutex = mutex;
res = scm_i_pthread_cond_wait (cond, mutex);
t->held_mutex = NULL;
return res;
return scm_i_pthread_cond_wait (cond, mutex);
}
int
@ -1703,14 +1687,7 @@ scm_pthread_cond_timedwait (scm_i_pthread_cond_t *cond,
scm_i_pthread_mutex_t *mutex,
const scm_t_timespec *wt)
{
int res;
scm_i_thread *t = SCM_I_CURRENT_THREAD;
t->held_mutex = mutex;
res = scm_i_pthread_cond_timedwait (cond, mutex, wt);
t->held_mutex = NULL;
return res;
return scm_i_pthread_cond_timedwait (cond, mutex, wt);
}
#endif

1
libguile/threads.h
View file

@ -63,7 +63,6 @@ typedef struct scm_i_thread {
SCM join_queue;
scm_i_pthread_mutex_t admin_mutex;
scm_i_pthread_mutex_t *held_mutex;
SCM result;
int exited;