Move to kernel style SPDX license identifiers

[lttng-ust.git] / libringbuffer / vatomic.h

diff --git a/libringbuffer/vatomic.h b/libringbuffer/vatomic.h
index eea6d049c71d995545054c5775a0b9cda43baf59..0f5cc03d9fdd895a6ad9cc56f88fa352b80df890 100644 (file)
--- a/libringbuffer/vatomic.h
+++ b/libringbuffer/vatomic.h
@@ -1,14 +1,15 @@
-#ifndef _LINUX_RING_BUFFER_VATOMIC_H
-#define _LINUX_RING_BUFFER_VATOMIC_H
-
 /*
- * linux/ringbuffer/vatomic.h
- *
- * Copyright (C) 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * SPDX-License-Identifier: MIT
  *
- * Dual LGPL v2.1/GPL v2 license.
+ * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  */
 
+#ifndef _LTTNG_RING_BUFFER_VATOMIC_H
+#define _LTTNG_RING_BUFFER_VATOMIC_H
+
+#include <assert.h>
+#include <urcu/uatomic.h>
+
 /*
  * Same data type (long) accessed differently depending on configuration.
  * v field is for non-atomic access (protected by mutual exclusion).
@@ -18,65 +19,54 @@
  * atomic_long_t is used for globally shared buffers.
  */
 union v_atomic {
-       local_t l;
-       atomic_long_t a;
+       long a; /* accessed through uatomic */
        long v;
 };
 
 static inline
-long v_read(const struct lib_ring_buffer_config *config, union v_atomic *v_a)
+long v_read(const struct lttng_ust_lib_ring_buffer_config *config, union v_atomic *v_a)
 {
-       if (config->sync == RING_BUFFER_SYNC_PER_CPU)
-               return local_read(&v_a->l);
-       else
-               return atomic_long_read(&v_a->a);
+       assert(config->sync != RING_BUFFER_SYNC_PER_CPU);
+       return uatomic_read(&v_a->a);
 }
 
 static inline
-void v_set(const struct lib_ring_buffer_config *config, union v_atomic *v_a,
+void v_set(const struct lttng_ust_lib_ring_buffer_config *config, union v_atomic *v_a,
           long v)
 {
-       if (config->sync == RING_BUFFER_SYNC_PER_CPU)
-               local_set(&v_a->l, v);
-       else
-               atomic_long_set(&v_a->a, v);
+       assert(config->sync != RING_BUFFER_SYNC_PER_CPU);
+       uatomic_set(&v_a->a, v);
 }
 
 static inline
-void v_add(const struct lib_ring_buffer_config *config, long v, union v_atomic *v_a)
+void v_add(const struct lttng_ust_lib_ring_buffer_config *config, long v, union v_atomic *v_a)
 {
-       if (config->sync == RING_BUFFER_SYNC_PER_CPU)
-               local_add(v, &v_a->l);
-       else
-               atomic_long_add(v, &v_a->a);
+       assert(config->sync != RING_BUFFER_SYNC_PER_CPU);
+       uatomic_add(&v_a->a, v);
 }
 
 static inline
-void v_inc(const struct lib_ring_buffer_config *config, union v_atomic *v_a)
+void v_inc(const struct lttng_ust_lib_ring_buffer_config *config, union v_atomic *v_a)
 {
-       if (config->sync == RING_BUFFER_SYNC_PER_CPU)
-               local_inc(&v_a->l);
-       else
-               atomic_long_inc(&v_a->a);
+       assert(config->sync != RING_BUFFER_SYNC_PER_CPU);
+       uatomic_inc(&v_a->a);
 }
 
 /*
  * Non-atomic decrement. Only used by reader, apply to reader-owned subbuffer.
  */
 static inline
-void _v_dec(const struct lib_ring_buffer_config *config, union v_atomic *v_a)
+void _v_dec(const struct lttng_ust_lib_ring_buffer_config *config, union v_atomic *v_a)
 {
        --v_a->v;
 }
 
 static inline
-long v_cmpxchg(const struct lib_ring_buffer_config *config, union v_atomic *v_a,
+long v_cmpxchg(const struct lttng_ust_lib_ring_buffer_config *config, union v_atomic *v_a,
               long old, long _new)
 {
-       if (config->sync == RING_BUFFER_SYNC_PER_CPU)
-               return local_cmpxchg(&v_a->l, old, _new);
-       else
-               return atomic_long_cmpxchg(&v_a->a, old, _new);
+       assert(config->sync != RING_BUFFER_SYNC_PER_CPU);
+       return uatomic_cmpxchg(&v_a->a, old, _new);
 }
 
-#endif /* _LINUX_RING_BUFFER_VATOMIC_H */
+#endif /* _LTTNG_RING_BUFFER_VATOMIC_H */