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authorBjörn Gustavsson <bjorn@erlang.org>2010-09-01 16:40:36 +0200
committerBjörn Gustavsson <bjorn@erlang.org>2010-09-01 16:40:41 +0200
commitfef717cbb47397b027cd3d92c091f5ea19251164 (patch)
treef2c3a57f20eb46b28195097530cad032e3f89c30 /erts
parent77d685c2212264752f6b7f52c5fa3f95820635d1 (diff)
parent789f9502eeb097d558c23750c534b807d965541d (diff)
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Merge branch 'mp/robustify-hipe_bifs_get_hrvtime' into dev
* mp/robustify-hipe_bifs_get_hrvtime: robustify hipe_bifs:get_hrvtime/0 OTP-8798
Diffstat (limited to 'erts')
-rw-r--r--erts/emulator/hipe/hipe_bif1.c49
1 files changed, 31 insertions, 18 deletions
diff --git a/erts/emulator/hipe/hipe_bif1.c b/erts/emulator/hipe/hipe_bif1.c
index 5188950e17..8f43811537 100644
--- a/erts/emulator/hipe/hipe_bif1.c
+++ b/erts/emulator/hipe/hipe_bif1.c
@@ -876,22 +876,44 @@ BIF_RETTYPE hipe_bifs_misc_timer_clear_0(BIF_ALIST_0)
* + The fallback, which is the same as {X,_} = runtime(statistics).
*/
+static double fallback_get_hrvtime(void)
+{
+ unsigned long ms_user;
+
+ elapsed_time_both(&ms_user, NULL, NULL, NULL);
+ return (double)ms_user;
+}
+
#if USE_PERFCTR
#include "hipe_perfctr.h"
-static int hrvtime_is_open;
-#define hrvtime_is_started() hrvtime_is_open
+static int hrvtime_started; /* 0: closed, +1: perfctr, -1: fallback */
+#define hrvtime_is_started() (hrvtime_started != 0)
static void start_hrvtime(void)
{
if (hipe_perfctr_hrvtime_open() >= 0)
- hrvtime_is_open = 1;
+ hrvtime_started = 1;
+ else
+ hrvtime_started = -1;
}
-#define get_hrvtime() hipe_perfctr_hrvtime_get()
-#define stop_hrvtime() hipe_perfctr_hrvtime_close()
+static void stop_hrvtime(void)
+{
+ if (hrvtime_started > 0)
+ hipe_perfctr_hrvtime_close();
+ hrvtime_started = 0;
+}
-#else
+static double get_hrvtime(void)
+{
+ if (hrvtime_started > 0)
+ return hipe_perfctr_hrvtime_get();
+ else
+ return fallback_get_hrvtime();
+}
+
+#else /* !USE_PERFCTR */
/*
* Fallback, if nothing better exists.
@@ -902,15 +924,9 @@ static void start_hrvtime(void)
#define hrvtime_is_started() 1
#define start_hrvtime() do{}while(0)
#define stop_hrvtime() do{}while(0)
+#define get_hrvtime() fallback_get_hrvtime()
-static double get_hrvtime(void)
-{
- unsigned long ms_user;
- elapsed_time_both(&ms_user, NULL, NULL, NULL);
- return (double)ms_user;
-}
-
-#endif /* hrvtime support */
+#endif /* !USE_PERFCTR */
BIF_RETTYPE hipe_bifs_get_hrvtime_0(BIF_ALIST_0)
{
@@ -918,11 +934,8 @@ BIF_RETTYPE hipe_bifs_get_hrvtime_0(BIF_ALIST_0)
Eterm res;
FloatDef f;
- if (!hrvtime_is_started()) {
+ if (!hrvtime_is_started())
start_hrvtime();
- if (!hrvtime_is_started())
- BIF_RET(NIL); /* arity 0 BIFs may not fail */
- }
f.fd = get_hrvtime();
hp = HAlloc(BIF_P, FLOAT_SIZE_OBJECT);
res = make_float(hp);