*/
#define _LGPL_SOURCE
+#include <stddef.h>
#include <lttng/ust-events.h>
#include <lttng/ust-tracer.h>
#include <lttng/ringbuffer-config.h>
static inline
char *wrapper_getprocname(void)
{
- int nesting = URCU_TLS(procname_nesting);
+ int nesting = CMM_LOAD_SHARED(URCU_TLS(procname_nesting));
if (caa_unlikely(nesting >= PROCNAME_NESTING_MAX))
return "<unknown>";
if (caa_unlikely(!URCU_TLS(cached_procname)[nesting][0])) {
CMM_STORE_SHARED(URCU_TLS(procname_nesting), nesting + 1);
+ /* Increment nesting before updating cache. */
+ cmm_barrier();
lttng_ust_getprocname(URCU_TLS(cached_procname)[nesting]);
URCU_TLS(cached_procname)[nesting][LTTNG_UST_PROCNAME_LEN - 1] = '\0';
+ /* Decrement nesting after updating cache. */
+ cmm_barrier();
CMM_STORE_SHARED(URCU_TLS(procname_nesting), nesting);
}
return URCU_TLS(cached_procname)[nesting];
}
+/* Reset should not be called from a signal handler. */
void lttng_context_procname_reset(void)
{
- URCU_TLS(cached_procname)[1][0] = '\0';
+ CMM_STORE_SHARED(URCU_TLS(cached_procname)[1][0], '\0');
CMM_STORE_SHARED(URCU_TLS(procname_nesting), 1);
- URCU_TLS(cached_procname)[0][0] = '\0';
+ CMM_STORE_SHARED(URCU_TLS(cached_procname)[0][0], '\0');
CMM_STORE_SHARED(URCU_TLS(procname_nesting), 0);
}
static
size_t procname_get_size(struct lttng_ctx_field *field, size_t offset)
{
- size_t size = 0;
-
- size += LTTNG_UST_PROCNAME_LEN;
- return size;
+ return LTTNG_UST_PROCNAME_LEN;
}
static
void procname_get_value(struct lttng_ctx_field *field,
struct lttng_ctx_value *value)
{
- char *procname;
-
- procname = wrapper_getprocname();
- value->u.str = procname;
+ value->u.str = wrapper_getprocname();
}
int lttng_add_procname_to_ctx(struct lttng_ctx **ctx)