atomics: Add helpers to atomically load/store bools

src/libstrongswan/utils/utils/atomics.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008-2014 Tobias Brunner
+ * Copyright (C) 2008-2026 Tobias Brunner
  * Copyright (C) 2005-2008 Martin Willi
  *
  * Copyright (C) secunet Security Networks AG
@@ -68,7 +68,7 @@ refcount_t ref_cur(refcount_t *ref)
 }
 
 /**
- * Spinlock for all compare and swap operations.
+ * Spinlock for all compare, swap and get/set operations.
  */
 static spinlock_t *cas_lock;
 
@@ -88,6 +88,23 @@ bool cas_##name(type *ptr, type oldval, type newval) \
 _cas_impl(bool, bool)
 _cas_impl(ptr, void*)
 
+bool atomic_get_bool(bool *ptr)
+{
+	bool val;
+
+	cas_lock->lock(cas_lock);
+	val = *ptr;
+	cas_lock->unlock(cas_lock);
+	return val;
+}
+
+void atomic_set_bool(bool *ptr, bool val)
+{
+	cas_lock->lock(cas_lock);
+	*ptr = val;
+	cas_lock->unlock(cas_lock);
+}
+
 #endif /* !HAVE_GCC_ATOMIC_OPERATIONS && !HAVE_GCC_SYNC_OPERATIONS */
 
 /**

src/libstrongswan/utils/utils/atomics.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008-2014 Tobias Brunner
+ * Copyright (C) 2008-2026 Tobias Brunner
  * Copyright (C) 2008 Martin Willi
  *
  * Copyright (C) secunet Security Networks AG
@@ -62,6 +62,9 @@ typedef u_int refcount_t;
 #define cas_bool(ptr, oldval, newval) _cas_impl(ptr, oldval, newval)
 #define cas_ptr(ptr, oldval, newval) _cas_impl(ptr, oldval, newval)
 
+#define atomic_get_bool(ptr) __atomic_load_n(ptr, __ATOMIC_ACQUIRE)
+#define atomic_set_bool(ptr, val) __atomic_store_n(ptr, val, __ATOMIC_RELEASE)
+
 #elif defined(HAVE_GCC_SYNC_OPERATIONS)
 
 #define ref_get(ref) __sync_add_and_fetch(ref, 1)
@@ -73,6 +76,9 @@ typedef u_int refcount_t;
 #define cas_ptr(ptr, oldval, newval) \
 					(__sync_bool_compare_and_swap(ptr, oldval, newval))
 
+#define atomic_get_bool(ptr) ({ bool _v = *(ptr); __sync_synchronize(); _v; })
+#define atomic_set_bool(ptr, val) (__sync_synchronize(), *(ptr) = (val))
+
 #else /* !HAVE_GCC_ATOMIC_OPERATIONS && !HAVE_GCC_SYNC_OPERATIONS */
 
 /**
@@ -124,6 +130,22 @@ bool cas_bool(bool *ptr, bool oldval, bool newval);
  */
 bool cas_ptr(void **ptr, void *oldval, void *newval);
 
+/**
+ * Atomically read value of ptr.
+ *
+ * @param ptr		pointer to variable
+ * @return			current value
+ */
+bool atomic_get_bool(bool *ptr);
+
+/**
+ * Atomically set value of ptr to val.
+ *
+ * @param ptr		pointer to variable
+ * @param val		new value
+ */
+void atomic_set_bool(bool *ptr, bool val);
+
 #endif /* HAVE_GCC_ATOMIC_OPERATIONS */
 
 /**