From a907d74903867fd47859d88d0042c74e1ca0e987 Mon Sep 17 00:00:00 2001
From: Palana <palana@stunned.de>
Date: Sun, 3 May 2015 20:40:33 +0200
Subject: [PATCH] util: Add os_atomic_compare_swap_long

---
 libobs/util/threading-posix.c   | 5 +++++
 libobs/util/threading-windows.c | 5 +++++
 libobs/util/threading.h         | 3 +++
 3 files changed, 13 insertions(+)

diff --git a/libobs/util/threading-posix.c b/libobs/util/threading-posix.c
index a36010093..dcf6d2850 100644
--- a/libobs/util/threading-posix.c
+++ b/libobs/util/threading-posix.c
@@ -256,6 +256,11 @@ long os_atomic_dec_long(volatile long *val)
 	return __sync_sub_and_fetch(val, 1);
 }
 
+bool os_atomic_compare_swap_long(volatile long *val, long old_val, long new_val)
+{
+	return __sync_bool_compare_and_swap(val, old_val, new_val);
+}
+
 void os_set_thread_name(const char *name)
 {
 #if defined(__APPLE__)
diff --git a/libobs/util/threading-windows.c b/libobs/util/threading-windows.c
index e1df042c8..115d706f8 100644
--- a/libobs/util/threading-windows.c
+++ b/libobs/util/threading-windows.c
@@ -176,6 +176,11 @@ long os_atomic_dec_long(volatile long *val)
 	return InterlockedDecrement(val);
 }
 
+bool os_atomic_compare_swap_long(volatile long *val, long old_val, long new_val)
+{
+	return InterlockedCompareExchange(val, new_val, old_val) == old_val;
+}
+
 #define VC_EXCEPTION 0x406D1388
 
 #pragma pack(push,8)
diff --git a/libobs/util/threading.h b/libobs/util/threading.h
index 749a541c3..5c4dacaf9 100644
--- a/libobs/util/threading.h
+++ b/libobs/util/threading.h
@@ -73,6 +73,9 @@ EXPORT int  os_sem_wait(os_sem_t *sem);
 EXPORT long os_atomic_inc_long(volatile long *val);
 EXPORT long os_atomic_dec_long(volatile long *val);
 
+EXPORT bool os_atomic_compare_swap_long(volatile long *val,
+		long old_val, long new_val);
+
 EXPORT void os_set_thread_name(const char *name);