* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#define _LGPL_SOURCE
#include <sys/types.h>
#include <unistd.h>
#include <lttng/ust-events.h>
#include <lttng/ust-tracer.h>
#include <lttng/ringbuffer-config.h>
-#ifdef __linux__
-static inline
-pid_t wrapper_getpid(void)
-{
- return getpid();
-}
-
-void lttng_context_vpid_reset(void)
-{
-}
-#else
/*
* We cache the result to ensure we don't trigger a system call for
* each event.
static pid_t cached_vpid;
static inline
-pid_t wrapper_getpid(void)
+pid_t wrapper_getvpid(void)
{
- if (caa_unlikely(!cached_vpid))
- cached_vpid = getpid();
- return cached_vpid;
+ pid_t vpid;
+
+ vpid = CMM_LOAD_SHARED(cached_vpid);
+ if (caa_unlikely(!vpid)) {
+ vpid = getpid();
+ CMM_STORE_SHARED(cached_vpid, vpid);
+ }
+ return vpid;
}
/*
*/
void lttng_context_vpid_reset(void)
{
- cached_vpid = 0;
+ CMM_STORE_SHARED(cached_vpid, 0);
}
-#endif
static
size_t vpid_get_size(struct lttng_ctx_field *field, size_t offset)
struct lttng_ust_lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan)
{
- pid_t pid;
+ pid_t vpid = wrapper_getvpid();
- pid = wrapper_getpid();
- lib_ring_buffer_align_ctx(ctx, lttng_alignof(pid));
- chan->ops->event_write(ctx, &pid, sizeof(pid));
+ lib_ring_buffer_align_ctx(ctx, lttng_alignof(vpid));
+ chan->ops->event_write(ctx, &vpid, sizeof(vpid));
}
static
void vpid_get_value(struct lttng_ctx_field *field,
struct lttng_ctx_value *value)
{
- pid_t pid;
-
- pid = wrapper_getpid();
- value->u.s64 = pid;
+ value->u.s64 = wrapper_getvpid();
}
int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx)