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);
}
static
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)