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Diffstat (limited to 'trace2/tr2_tls.c')
-rw-r--r--trace2/tr2_tls.c38
1 files changed, 24 insertions, 14 deletions
diff --git a/trace2/tr2_tls.c b/trace2/tr2_tls.c
index 8e65b03..e76d8c5 100644
--- a/trace2/tr2_tls.c
+++ b/trace2/tr2_tls.c
@@ -10,16 +10,30 @@
#define TR2_REGION_NESTING_INITIAL_SIZE (100)
static struct tr2tls_thread_ctx *tr2tls_thread_main;
-static uint64_t tr2tls_us_start_main;
+static uint64_t tr2tls_us_start_process;
static pthread_mutex_t tr2tls_mutex;
static pthread_key_t tr2tls_key;
static int tr2_next_thread_id; /* modify under lock */
-struct tr2tls_thread_ctx *tr2tls_create_self(const char *thread_name)
+void tr2tls_start_process_clock(void)
+{
+ if (tr2tls_us_start_process)
+ return;
+
+ /*
+ * Keep the absolute start time of the process (i.e. the main
+ * process) in a fixed variable since other threads need to
+ * access it. This allows them to do that without a lock on
+ * main thread's array data (because of reallocs).
+ */
+ tr2tls_us_start_process = getnanotime() / 1000;
+}
+
+struct tr2tls_thread_ctx *tr2tls_create_self(const char *thread_name,
+ uint64_t us_thread_start)
{
- uint64_t us_now = getnanotime() / 1000;
struct tr2tls_thread_ctx *ctx = xcalloc(1, sizeof(*ctx));
/*
@@ -29,7 +43,7 @@ struct tr2tls_thread_ctx *tr2tls_create_self(const char *thread_name)
*/
ctx->alloc = TR2_REGION_NESTING_INITIAL_SIZE;
ctx->array_us_start = (uint64_t *)xcalloc(ctx->alloc, sizeof(uint64_t));
- ctx->array_us_start[ctx->nr_open_regions++] = us_now;
+ ctx->array_us_start[ctx->nr_open_regions++] = us_thread_start;
ctx->thread_id = tr2tls_locked_increment(&tr2_next_thread_id);
@@ -55,7 +69,7 @@ struct tr2tls_thread_ctx *tr2tls_get_self(void)
* here and silently continue.
*/
if (!ctx)
- ctx = tr2tls_create_self("unknown");
+ ctx = tr2tls_create_self("unknown", getnanotime() / 1000);
return ctx;
}
@@ -124,22 +138,18 @@ uint64_t tr2tls_absolute_elapsed(uint64_t us)
if (!tr2tls_thread_main)
return 0;
- return us - tr2tls_us_start_main;
+ return us - tr2tls_us_start_process;
}
void tr2tls_init(void)
{
+ tr2tls_start_process_clock();
+
pthread_key_create(&tr2tls_key, NULL);
init_recursive_mutex(&tr2tls_mutex);
- tr2tls_thread_main = tr2tls_create_self("main");
- /*
- * Keep a copy of the absolute start time of the main thread
- * in a fixed variable since other threads need to access it.
- * This also eliminates the need to lock accesses to the main
- * thread's array (because of reallocs).
- */
- tr2tls_us_start_main = tr2tls_thread_main->array_us_start[0];
+ tr2tls_thread_main =
+ tr2tls_create_self("main", tr2tls_us_start_process);
}
void tr2tls_release(void)