From: m4tt075 <mgawalter@web.de>
Date: Thu, 15 Jun 2017 08:30:19 +0000 (+0200)
Subject: Compatibility fix to add atomic32 support
X-Git-Tag: v4.2.3~32
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4e77d2a8bfcc339af77dc8a9b068ae9dd481025a;p=thirdparty%2Ftvheadend.git

Compatibility fix to add atomic32 support
---

diff --git a/configure b/configure
index cf62abad8..b3f6a5242 100755
--- a/configure
+++ b/configure
@@ -155,6 +155,11 @@ fi
 check_cc_snippet getloadavg '#include <stdlib.h>
 void test() { getloadavg(NULL,0); }'
 
+check_cc_snippet atomic32 '#include <stdint.h>
+int test(int *ptr){
+return __sync_fetch_and_add(ptr, 1);
+}'
+
 check_cc_snippet atomic64 '#include <stdint.h>
 uint64_t test(uint64_t *ptr){
 return __sync_fetch_and_add(ptr, 1);
diff --git a/src/atomic.h b/src/atomic.h
index 23c4079cd..402a2861e 100644
--- a/src/atomic.h
+++ b/src/atomic.h
@@ -30,7 +30,16 @@ extern pthread_mutex_t atomic_lock;
 static inline int
 atomic_add(volatile int *ptr, int incr)
 {
+#if ENABLE_ATOMIC32
   return __sync_fetch_and_add(ptr, incr);
+#else
+  int ret;
+  pthread_mutex_lock(&atomic_lock);
+  ret = *ptr;
+  *ptr += incr;
+  pthread_mutex_unlock(&atomic_lock);
+  return ret;
+#endif
 }
 
 static inline uint64_t
@@ -144,7 +153,16 @@ atomic_pre_add_s64_peak(volatile int64_t *ptr, int64_t incr,
 static inline int
 atomic_dec(volatile int *ptr, int decr)
 {
+#if ENABLE_ATOMIC32
   return __sync_fetch_and_sub(ptr, decr);
+#else
+  int ret;
+  pthread_mutex_lock(&atomic_lock);
+  ret = *ptr;
+  *ptr -= decr;
+  pthread_mutex_unlock(&atomic_lock);
+  return ret;
+#endif
 }
 
 static inline uint64_t
@@ -184,7 +202,16 @@ atomic_dec_s64(volatile int64_t *ptr, int64_t decr)
 static inline int
 atomic_exchange(volatile int *ptr, int val)
 {
+#if ENABLE_ATOMIC32
   return  __sync_lock_test_and_set(ptr, val);
+#else
+  int ret;
+  pthread_mutex_lock(&atomic_lock);
+  ret = *ptr;
+  *ptr = val;
+  pthread_mutex_unlock(&atomic_lock);
+  return ret;
+#endif
 }
 
 static inline uint64_t