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atomics: Add helpers to atomically load/store bools

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This commit is contained in:
Tobias Brunner
2026-07-31 16:07:52 +02:00
parent bf438cb182
commit 3934089415
2 changed files with 42 additions and 3 deletions
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src/libstrongswan/utils/utils/atomics.c
+19 -2
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@@ -1,5 +1,5 @@
/* /*
* Copyright (C) 2008-2014 Tobias Brunner * Copyright (C) 2008-2026 Tobias Brunner
* Copyright (C) 2005-2008 Martin Willi * Copyright (C) 2005-2008 Martin Willi
* *
* Copyright (C) secunet Security Networks AG * 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; static spinlock_t *cas_lock;
@@ -88,6 +88,23 @@ bool cas_##name(type *ptr, type oldval, type newval) \
_cas_impl(bool, bool) _cas_impl(bool, bool)
_cas_impl(ptr, void*) _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 */ #endif /* !HAVE_GCC_ATOMIC_OPERATIONS && !HAVE_GCC_SYNC_OPERATIONS */
/** /**
src/libstrongswan/utils/utils/atomics.h
+23 -1
View File
@@ -1,5 +1,5 @@
/* /*
* Copyright (C) 2008-2014 Tobias Brunner * Copyright (C) 2008-2026 Tobias Brunner
* Copyright (C) 2008 Martin Willi * Copyright (C) 2008 Martin Willi
* *
* Copyright (C) secunet Security Networks AG * 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_bool(ptr, oldval, newval) _cas_impl(ptr, oldval, newval)
#define cas_ptr(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) #elif defined(HAVE_GCC_SYNC_OPERATIONS)
#define ref_get(ref) __sync_add_and_fetch(ref, 1) #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) \ #define cas_ptr(ptr, oldval, newval) \
(__sync_bool_compare_and_swap(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 */ #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); 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 */ #endif /* HAVE_GCC_ATOMIC_OPERATIONS */
/** /**