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Cleanup vtid/vpid context caches
[lttng-ust.git]
/
liblttng-ust
/
lttng-context-vpid.c
diff --git
a/liblttng-ust/lttng-context-vpid.c
b/liblttng-ust/lttng-context-vpid.c
index 53fb314b8c0da1bdf353f00c59c953879b4ed150..11978e6e33d8e0f93ac4fb0bd34e12495790d7e4 100644
(file)
--- a/
liblttng-ust/lttng-context-vpid.c
+++ b/
liblttng-ust/lttng-context-vpid.c
@@
-34,11
+34,16
@@
static pid_t cached_vpid;
static inline
static pid_t cached_vpid;
static inline
-pid_t wrapper_getpid(void)
+pid_t wrapper_get
v
pid(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;
}
/*
}
/*
@@
-47,7
+52,7
@@
pid_t wrapper_getpid(void)
*/
void lttng_context_vpid_reset(void)
{
*/
void lttng_context_vpid_reset(void)
{
-
cached_vpid = 0
;
+
CMM_STORE_SHARED(cached_vpid, 0)
;
}
static
}
static
@@
-65,21
+70,17
@@
void vpid_record(struct lttng_ctx_field *field,
struct lttng_ust_lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan)
{
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)
{
}
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)
}
int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx)
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