diff options
Diffstat (limited to 'src/common/compat_threads.c')
| -rw-r--r-- | src/common/compat_threads.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/src/common/compat_threads.c b/src/common/compat_threads.c index 208d3138d9..3171c4b2f2 100644 --- a/src/common/compat_threads.c +++ b/src/common/compat_threads.c @@ -48,7 +48,7 @@ tor_mutex_new_nonrecursive(void) } /** Release all storage and system resources held by <b>m</b>. */ void -tor_mutex_free(tor_mutex_t *m) +tor_mutex_free_(tor_mutex_t *m) { if (!m) return; @@ -68,7 +68,7 @@ tor_cond_new(void) /** Free all storage held in <b>c</b>. */ void -tor_cond_free(tor_cond_t *c) +tor_cond_free_(tor_cond_t *c) { if (!c) return; @@ -352,12 +352,7 @@ alert_sockets_close(alert_sockets_t *socks) socks->read_fd = socks->write_fd = -1; } -/* - * XXXX We might be smart to move to compiler intrinsics or real atomic - * XXXX operations at some point. But not yet. - * - */ - +#ifndef HAVE_STDATOMIC_H /** Initialize a new atomic counter with the value 0 */ void atomic_counter_init(atomic_counter_t *counter) @@ -397,4 +392,16 @@ atomic_counter_get(atomic_counter_t *counter) tor_mutex_release(&counter->mutex); return val; } +/** Replace the value of an atomic counter; return the old one. */ +size_t +atomic_counter_exchange(atomic_counter_t *counter, size_t newval) +{ + size_t oldval; + tor_mutex_acquire(&counter->mutex); + oldval = counter->val; + counter->val = newval; + tor_mutex_release(&counter->mutex); + return oldval; +} +#endif /* !defined(HAVE_STDATOMIC_H) */ |