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authorLukas Larsson <[email protected]>2014-09-11 18:26:26 +0200
committerLukas Larsson <[email protected]>2016-02-02 10:45:21 +0100
commiteea5f896780e07f7ca76685061d01e7be5a7abaa (patch)
tree7d4a852b20f2075637457052844865e1c56b1e21 /erts/emulator/sys/win32
parentd76ee58c07f32dfc0652844ec2b513af2105ffa1 (diff)
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erts, kernel: Add os:perf_counter function
The perf_counter is a very very cheap and high resolution timer that can be used to timestamp system events. It does not have monoticity guarantees, but should on most OS's expose a monotonous time. A special instruction has been created for this counter to further speed up fetching it. OTP-12908
Diffstat (limited to 'erts/emulator/sys/win32')
-rw-r--r--erts/emulator/sys/win32/erl_win_sys.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/erts/emulator/sys/win32/erl_win_sys.h b/erts/emulator/sys/win32/erl_win_sys.h
index 7e8dd8a4ca..1ab9eadefd 100644
--- a/erts/emulator/sys/win32/erl_win_sys.h
+++ b/erts/emulator/sys/win32/erl_win_sys.h
@@ -238,6 +238,8 @@ erts_sys_hrtime(void)
extern void sys_gettimeofday(SysTimeval *tv);
extern clock_t sys_times(SysTimes *buffer);
+#define sys_perf_counter(ts) *(ts) = erts_sys_hrtime()
+#define SYS_PERF_COUNTER_UNIT ERTS_I64_LITERAL(1000000000)
extern char *win_build_environment(char *);