lib: make atomic ops C++ compatible

C++ doesn't have ISO C11 stdatomic.h or "_Atomic inttype", so use
std::atomic instead to get the headers compatible.

Signed-off-by: David Lamparter <equinox@diac24.net>

lib/debug.h

@@ -76,7 +76,7 @@
  *    Human-readable description of this debugging record.
  */
 struct debug {
-	_Atomic uint32_t flags;
+	atomic_uint_fast32_t flags;
 	const char *desc;
 };
 

lib/frr_pthread.h

@@ -73,7 +73,7 @@ struct frr_pthread {
 	 */
 	pthread_cond_t *running_cond;
 	pthread_mutex_t *running_cond_mtx;
-	_Atomic bool running;
+	atomic_bool running;
 
 	/*
 	 * Fake thread-specific storage. No constraints on usage. Helpful when

lib/frratomic.h

@@ -26,7 +26,23 @@
 #endif
 
 /* ISO C11 */
-#ifdef HAVE_STDATOMIC_H
+#ifdef __cplusplus
+#include <stdint.h>
+#include <atomic>
+using std::atomic_int;
+using std::memory_order;
+using std::memory_order_relaxed;
+using std::memory_order_acquire;
+using std::memory_order_release;
+using std::memory_order_acq_rel;
+using std::memory_order_consume;
+using std::memory_order_seq_cst;
+
+typedef std::atomic<bool>		atomic_bool;
+typedef std::atomic<size_t>		atomic_size_t;
+typedef std::atomic<uint_fast32_t>	atomic_uint_fast32_t;
+
+#elif defined(HAVE_STDATOMIC_H)
 #include <stdatomic.h>
 
 /* These are available in gcc, but not in stdatomic */
@@ -39,6 +55,7 @@
 #elif defined(HAVE___ATOMIC)
 
 #define _Atomic volatile
+#define _ATOMIC_WANT_TYPEDEFS
 
 #define memory_order_relaxed __ATOMIC_RELAXED
 #define memory_order_consume __ATOMIC_CONSUME
@@ -74,6 +91,7 @@
 #elif defined(HAVE___SYNC)
 
 #define _Atomic volatile
+#define _ATOMIC_WANT_TYPEDEFS
 
 #define memory_order_relaxed 0
 #define memory_order_consume 0
@@ -198,4 +216,15 @@
 #error no atomic functions...
 #endif
 
+#ifdef _ATOMIC_WANT_TYPEDEFS
+#undef _ATOMIC_WANT_TYPEDEFS
+
+#include <stdint.h>
+#include <stdbool.h>
+
+typedef _Atomic bool		atomic_bool;
+typedef _Atomic size_t		atomic_size_t;
+typedef _Atomic uint_fast32_t	atomic_uint_fast32_t;
+#endif
+
 #endif /* _FRRATOMIC_H */

lib/hash.h

@@ -54,9 +54,9 @@ struct hash_backet {
 
 struct hashstats {
 	/* number of empty hash buckets */
-	_Atomic uint_fast32_t empty;
+	atomic_uint_fast32_t empty;
 	/* sum of squares of bucket length */
-	_Atomic uint_fast32_t ssq;
+	atomic_uint_fast32_t ssq;
 };
 
 struct hash {

lib/memory.h

@@ -33,12 +33,12 @@
 struct memtype {
 	struct memtype *next, **ref;
 	const char *name;
-	_Atomic size_t n_alloc;
+	atomic_size_t n_alloc;
-	_Atomic size_t n_max;
+	atomic_size_t n_max;
-	_Atomic size_t size;
+	atomic_size_t size;
 #ifdef HAVE_MALLOC_USABLE_SIZE
-	_Atomic size_t total;
+	atomic_size_t total;
-	_Atomic size_t max_size;
+	atomic_size_t max_size;
 #endif
 };
 

lib/stream.h

@@ -115,9 +115,9 @@ struct stream_fifo {
 	pthread_mutex_t mtx;
 
 	/* number of streams in this fifo */
-	_Atomic size_t count;
+	atomic_size_t count;
 #if defined DEV_BUILD
-	_Atomic size_t max_count;
+	atomic_size_t max_count;
 #endif
 
 	struct stream *head;

lib/thread.c

@@ -93,7 +93,8 @@ static void cpu_record_hash_free(void *a)
 static void vty_out_cpu_thread_history(struct vty *vty,
 				       struct cpu_thread_history *a)
 {
-	vty_out(vty, "%5d %10lu.%03lu %9u %8lu %9lu %8lu %9lu", a->total_active,
+	vty_out(vty, "%5"PRIdFAST32" %10lu.%03lu %9"PRIuFAST32
+		" %8lu %9lu %8lu %9lu", a->total_active,
 		a->cpu.total / 1000, a->cpu.total % 1000, a->total_calls,
 		a->cpu.total / a->total_calls, a->cpu.max,
 		a->real.total / a->total_calls, a->real.max);

lib/thread.h

@@ -119,13 +119,13 @@ struct thread {
 
 struct cpu_thread_history {
 	int (*func)(struct thread *);
-	_Atomic unsigned int total_calls;
+	atomic_uint_fast32_t total_calls;
-	_Atomic unsigned int total_active;
+	atomic_uint_fast32_t total_active;
 	struct time_stats {
-		_Atomic unsigned long total, max;
+		atomic_size_t total, max;
 	} real;
 	struct time_stats cpu;
-	_Atomic uint32_t types;
+	atomic_uint_fast32_t types;
 	const char *funcname;
 };