Add extern "C" to common headers.

include/atomic.h

@@ -3,6 +3,9 @@
 
 #include "static_assert.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 typedef void *volatile XchgPtr;
 
@@ -198,4 +201,8 @@ inline void *CompExchangePtr(XchgPtr *ptr, void *oldval, void *newval)
 #error "No atomic functions available on this platform!"
 #endif
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* AL_ATOMIC_H */

include/rwlock.h

@@ -4,6 +4,10 @@
 #include "bool.h"
 #include "atomic.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef struct {
     RefCount read_count;
     RefCount write_count;
@@ -19,4 +23,8 @@ void ReadUnlock(RWLock *lock);
 void WriteLock(RWLock *lock);
 void WriteUnlock(RWLock *lock);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* AL_RWLOCK_H */

include/threads.h

@@ -3,6 +3,9 @@
 
 #include <time.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 enum {
     althrd_success = 0,
@@ -227,4 +230,8 @@ int altimespec_get(struct timespec *ts, int base);
 
 void al_nssleep(time_t sec, long nsec);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* AL_THREADS_H */

include/uintmap.h

@@ -4,6 +4,10 @@
 #include "AL/al.h"
 #include "rwlock.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef struct UIntMap {
     struct {
         ALuint key;
@@ -32,4 +36,8 @@ inline void LockUIntMapWrite(UIntMap *map)
 inline void UnlockUIntMapWrite(UIntMap *map)
 { WriteUnlock(&map->lock); }
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* AL_UINTMAP_H */