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Diffstat (limited to 'private/crt32/time/clock.c')
| -rw-r--r-- | private/crt32/time/clock.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/private/crt32/time/clock.c b/private/crt32/time/clock.c new file mode 100644 index 000000000..cf94837c5 --- /dev/null +++ b/private/crt32/time/clock.c @@ -0,0 +1,169 @@ +/*** +*clock.c - Contains the clock runtime +* +* Copyright (c) 1987-1991, Microsoft Corporation. All rights reserved. +* +*Purpose: +* The clock runtime returns the processor time used by +* the current process. +* +*Revision History: +* 01-17-87 JCR Module created +* 06-01-87 SKS "itime" must be declared static +* 07-20-87 JCR Changes "inittime" to "_inittime" +* 12-11-87 JCR Added "_LOAD_DS" to declaration +* 03-20-90 GJF Made calling type _CALLTYPE1, added #include +* <cruntime.h> and fixed the copyright. Also, cleaned +* up the formatting a bit. +* 10-04-90 GJF New-style function declarators. +* 01-22-91 GJF ANSI naming. +* 07-25-91 GJF Added _pinittime definition for new initialization +* scheme [_WIN32_]. +* 03-13-92 SKS Changed itime from static local to external as +* a part of return to initializer table scheme. +* Changed _inittime to __inittime. +* 05-19-92 DJM POSIX support. +* +*******************************************************************************/ + +#include <cruntime.h> +#include <stdio.h> +#include <time.h> + +#ifdef _POSIX_ +#include <posix/sys/times.h> +#else +#include <sys\timeb.h> +#include <sys\types.h> +#endif /* _POSIX_ */ + + +#ifndef _POSIX_ + +void __cdecl __inittime(void); + +#ifdef _MSC_VER + +#pragma data_seg(".CRT$XIC") +static void (__cdecl *pinit)(void) = __inittime; + +#pragma data_seg() + +#endif /* _MSC_VER */ + +struct _timeb __itimeb = { 0, 0, 0, 0 }; + +/*** +*clock_t clock() - Return the processor time used by this process. +* +*Purpose: +* This routine calculates how much time the calling process +* has used. At startup time, startup calls __inittime which stores +* the initial time. The clock routine calculates the difference +* between the current time and the initial time. +* +* Clock must reference _cinitime so that _cinitim.asm gets linked in. +* That routine, in turn, puts __inittime in the startup initialization +* routine table. +* +*Entry: +* No parameters. +* itime is a static structure of type timeb. +* +*Exit: +* If successful, clock returns the number of CLK_TCKs (milliseconds) +* that have elapsed. If unsuccessful, clock returns -1. +* +*Exceptions: +* None. +* +*******************************************************************************/ + +clock_t _CALLTYPE1 clock ( + void + ) +{ + struct _timeb now; + clock_t elapsed; + +#ifdef _CRUISER_ + + extern int _citime; + + /* Reference _citime so __inittime gets executed at startup time.*/ + + _citime=0; + +#endif /* _CRUISER_ */ + + /* Calculate the difference between the initial time and now. */ + + _ftime(&now); + elapsed = (now.time - __itimeb.time) * CLOCKS_PER_SEC; + elapsed += (int)now.millitm - (int)__itimeb.millitm; + return(elapsed); + +} + +/*** +*void __inittime() - Initialize the time location +* +*Purpose: +* This routine stores the time of the process startup. +* It is only linked in if the user issues a clock runtime call. +* +*Entry: +* No arguments. +* +*Exit: +* No return value. +* +*Exceptions: +* None. +* +*******************************************************************************/ + +void _CALLTYPE1 __inittime ( + void + ) +{ + _ftime(&__itimeb); +} + +#else /* _POSIX_ */ + +/*** +*clock_t clock() - Return the processor time used by this process. +* +*Purpose: +* This routine calculates how much time the calling process +* has used. It uses the POSIX system call times(). +* +* +*Entry: +* No parameters. +* +*Exit: +* If successful, clock returns the number of CLK_TCKs (milliseconds) +* that have elapsed. If unsuccessful, clock returns -1. +* +*Exceptions: +* None. +* +*******************************************************************************/ + +clock_t _CALLTYPE1 clock ( + void + ) +{ + struct tms now; + clock_t elapsed; + + elapsed= times(&now); + if (elapsed == (clock_t) -1) + return((clock_t) -1); + else + return(now.tms_utime+now.tms_stime); +} + +#endif /* _POSIX_ */ |