-----------------------------------------------------------------------------
---
+-- |
-- Module : System.CPUTime
-- Copyright : (c) The University of Glasgow 2001
--- License : BSD-style (see the file libraries/core/LICENSE)
+-- License : BSD-style (see the file libraries/base/LICENSE)
--
-- Maintainer : libraries@haskell.org
-- Stability : provisional
-- Portability : portable
--
--- $Id: CPUTime.hsc,v 1.2 2001/06/29 09:44:03 simonmar Exp $
---
-- The standard CPUTime library.
--
-----------------------------------------------------------------------------
module System.CPUTime
(
getCPUTime, -- :: IO Integer
- cpuTimePrecision -- :: Integer
+ cpuTimePrecision -- :: Integer
) where
import Prelude
+import Data.Ratio
+
+#ifdef __HUGS__
+import Hugs.Time ( getCPUTime, clockTicks )
+#endif
+
+#ifdef __NHC__
+import CPUTime ( getCPUTime, cpuTimePrecision )
+#endif
+
+#ifdef __GLASGOW_HASKELL__
import Foreign
import Foreign.C
-import Data.Ratio
-
-#include "HsCore.h"
+#include "HsBase.h"
+#endif
+#ifdef __GLASGOW_HASKELL__
-- -----------------------------------------------------------------------------
--- Computation `getCPUTime' returns the number of picoseconds CPU time
+-- |Computation 'getCPUTime' returns the number of picoseconds CPU time
-- used by the current program. The precision of this result is
-- implementation-dependent.
--- The `cpuTimePrecision' constant is the smallest measurable difference
--- in CPU time that the implementation can record, and is given as an
--- integral number of picoseconds.
-
getCPUTime :: IO Integer
getCPUTime = do
-#ifndef _WIN32
+#if !defined(mingw32_HOST_OS) && !defined(cygwin32_HOST_OS)
-- getrusage() is right royal pain to deal with when targetting multiple
-- versions of Solaris, since some versions supply it in libc (2.3 and 2.5),
-- while 2.4 has got it in libucb (I wouldn't be too surprised if it was back
--
-- Avoid the problem by resorting to times() instead.
--
-#if defined(HAVE_GETRUSAGE) && ! irix_TARGET_OS && ! solaris2_TARGET_OS
+#if defined(HAVE_GETRUSAGE) && ! irix_HOST_OS && ! solaris2_HOST_OS
allocaBytes (#const sizeof(struct rusage)) $ \ p_rusage -> do
getrusage (#const RUSAGE_SELF) p_rusage
let ru_utime = (#ptr struct rusage, ru_utime) p_rusage
let ru_stime = (#ptr struct rusage, ru_stime) p_rusage
- u_sec <- (#peek struct timeval,tv_sec) ru_utime :: IO CLong
- u_usec <- (#peek struct timeval,tv_usec) ru_utime :: IO CLong
- s_sec <- (#peek struct timeval,tv_sec) ru_stime :: IO CLong
- s_usec <- (#peek struct timeval,tv_usec) ru_stime :: IO CLong
-
- return ((fromIntegral u_sec * 1000000 + fromIntegral u_usec +
- fromIntegral s_sec * 1000000 + fromIntegral s_usec)
+ u_sec <- (#peek struct timeval,tv_sec) ru_utime :: IO CTime
+ u_usec <- (#peek struct timeval,tv_usec) ru_utime :: IO CTime
+ s_sec <- (#peek struct timeval,tv_sec) ru_stime :: IO CTime
+ s_usec <- (#peek struct timeval,tv_usec) ru_stime :: IO CTime
+ let realToInteger = round . realToFrac :: Real a => a -> Integer
+ return ((realToInteger u_sec * 1000000 + realToInteger u_usec +
+ realToInteger s_sec * 1000000 + realToInteger s_usec)
* 1000000)
type CRUsage = ()
-foreign import unsafe getrusage :: CInt -> Ptr CRUsage -> IO CInt
+foreign import ccall unsafe getrusage :: CInt -> Ptr CRUsage -> IO CInt
#else
# if defined(HAVE_TIMES)
allocaBytes (#const sizeof(struct tms)) $ \ p_tms -> do
times p_tms
u_ticks <- (#peek struct tms,tms_utime) p_tms :: IO CClock
s_ticks <- (#peek struct tms,tms_stime) p_tms :: IO CClock
- return (( (fromIntegral u_ticks + fromIntegral s_ticks) * 1000000000000)
- `div` clockTicks)
+ let realToInteger = round . realToFrac :: Real a => a -> Integer
+ return (( (realToInteger u_ticks + realToInteger s_ticks) * 1000000000000)
+ `div` fromIntegral clockTicks)
type CTms = ()
-foreign import unsafe times :: Ptr CTms -> CClock
+foreign import ccall unsafe times :: Ptr CTms -> IO CClock
# else
ioException (IOError Nothing UnsupportedOperation
"getCPUTime"
# endif
#endif
-#else /* _WIN32 */
+#else /* win32 */
+ -- NOTE: GetProcessTimes() is only supported on NT-based OSes.
+ -- The counts reported by GetProcessTimes() are in 100-ns (10^-7) units.
allocaBytes (#const sizeof(FILETIME)) $ \ p_creationTime -> do
allocaBytes (#const sizeof(FILETIME)) $ \ p_exitTime -> do
allocaBytes (#const sizeof(FILETIME)) $ \ p_kernelTime -> do
if toBool ok then do
ut <- ft2psecs p_userTime
kt <- ft2psecs p_kernelTime
- return (fromIntegral (ut + kt))
+ return (ut + kt)
else return 0
- where ft2psecs ft = do
+ where
+ ft2psecs :: Ptr FILETIME -> IO Integer
+ ft2psecs ft = do
high <- (#peek FILETIME,dwHighDateTime) ft :: IO CLong
low <- (#peek FILETIME,dwLowDateTime) ft :: IO CLong
+ -- Convert 100-ns units to picosecs (10^-12)
+ -- => multiply by 10^5.
return (((fromIntegral high) * (2^32) + (fromIntegral low)) * 100000)
-- ToDo: pin down elapsed times to just the OS thread(s) that
type FILETIME = ()
type HANDLE = ()
-- need proper Haskell names (initial lower-case character)
-foreign import "GetCurrentProcess" unsafe getCurrentProcess :: IO (Ptr HANDLE)
-foreign import "GetProcessTimes" unsafe getProcessTimes :: Ptr HANDLE -> Ptr FILETIME -> Ptr FILETIME -> Ptr FILETIME -> Ptr FILETIME -> IO CInt
+foreign import ccall unsafe "GetCurrentProcess" getCurrentProcess :: IO (Ptr HANDLE)
+foreign import ccall unsafe "GetProcessTimes" getProcessTimes :: Ptr HANDLE -> Ptr FILETIME -> Ptr FILETIME -> Ptr FILETIME -> Ptr FILETIME -> IO CInt
#endif /* not _WIN32 */
+#endif /* __GLASGOW_HASKELL__ */
+-- |The 'cpuTimePrecision' constant is the smallest measurable difference
+-- in CPU time that the implementation can record, and is given as an
+-- integral number of picoseconds.
+
+#ifndef __NHC__
cpuTimePrecision :: Integer
cpuTimePrecision = round ((1000000000000::Integer) % fromIntegral (clockTicks))
+#endif
+#ifdef __GLASGOW_HASKELL__
clockTicks :: Int
clockTicks =
#if defined(CLK_TCK)
(#const CLK_TCK)
#else
unsafePerformIO (sysconf (#const _SC_CLK_TCK) >>= return . fromIntegral)
-foreign import unsafe sysconf :: CInt -> IO CLong
+foreign import ccall unsafe sysconf :: CInt -> IO CLong
#endif
+#endif /* __GLASGOW_HASKELL__ */