From: Memphis <memphis@machzwo.de>
Date: Wed, 13 May 2015 18:32:00 +0000 (+0200)
Subject: - add atomic_dec_u64
X-Git-Tag: v4.1~13
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=83166081e0c207acf966583a804f6b313f241a9e;p=thirdparty%2Ftvheadend.git

- add atomic_dec_u64
---

diff --git a/src/atomic.h b/src/atomic.h
index 1c3eb5aeb..99fe3af79 100644
--- a/src/atomic.h
+++ b/src/atomic.h
@@ -51,6 +51,21 @@ atomic_add_u64(volatile uint64_t *ptr, uint64_t incr)
 #endif
 }
 
+static inline uint64_t
+atomic_dec_u64(volatile uint64_t *ptr, uint64_t decr)
+{
+#if ENABLE_ATOMIC64
+  return __sync_fetch_and_sub(ptr, decr);
+#else
+  uint64_t ret;
+  pthread_mutex_lock(&atomic_lock);
+  ret = *ptr;
+  *ptr -= decr;
+  pthread_mutex_unlock(&atomic_lock);
+  return ret;
+#endif
+}
+
 static inline uint64_t
 atomic_pre_add_u64(volatile uint64_t *ptr, uint64_t incr)
 {