-----------------------------------------------------------------------------
---
+-- |
-- Module : System.CPUTime
-- Copyright : (c) The University of Glasgow 2001
-- License : BSD-style (see the file libraries/core/LICENSE)
-- Stability : provisional
-- Portability : portable
--
--- $Id: CPUTime.hsc,v 1.4 2001/08/17 12:50:34 simonmar Exp $
---
-- The standard CPUTime library.
--
-----------------------------------------------------------------------------
module System.CPUTime
(
getCPUTime, -- :: IO Integer
- cpuTimePrecision -- :: Integer
+ cpuTimePrecision -- :: Integer
) where
import Prelude
import Data.Ratio
-#include "HsCore.h"
+#include "HsBase.h"
-- -----------------------------------------------------------------------------
--- 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
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
+ 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
return ((fromIntegral u_sec * 1000000 + fromIntegral u_usec +
fromIntegral s_sec * 1000000 + fromIntegral 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
`div` fromIntegral clockTicks)
type CTms = ()
-foreign import unsafe times :: Ptr CTms -> IO CClock
+foreign import ccall unsafe times :: Ptr CTms -> IO CClock
# else
ioException (IOError Nothing UnsupportedOperation
"getCPUTime"
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 */
+-- |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.
+
cpuTimePrecision :: Integer
cpuTimePrecision = round ((1000000000000::Integer) % fromIntegral (clockTicks))
(#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