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Full Discussion: semaphore access speed
Top Forums Programming semaphore access speed Post 302238331 by jim mcnamara on Friday 19th of September 2008 03:27:02 PM
Old 09-19-2008
PS call utimes(struct tms *) to actual times, plus granularity is CLK_TCK, usually way better than time().

gettimeofday can be used to get wall time even more accurately as well. utimes() returns clock_t wall time.
 

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TIMES(2)							System Calls Manual							  TIMES(2)

NAME
times - get process times SYNOPSIS
#include <sys/types.h> #include <sys/times.h> #include <time.h> int times(struct tms *buffer) DESCRIPTION
Times returns time-accounting information for the current process and for the terminated child processes of the current process. All times are in 1/CLOCKS_PER_SEC seconds. This is the structure returned by times: struct tms { clock_t tms_utime; /* user time for this process */ clock_t tms_stime; /* system time for this process */ clock_t tms_cutime; /* children's user time */ clock_t tms_cstime; /* children's system time */ }; The user time is the number of clock ticks used by a process on its own computations. The system time is the number of clock ticks spent inside the kernel on behalf of a process. This does not include time spent waiting for I/O to happen, only actual CPU instruction times. The children times are the sum of the children's process times and their children's times. RETURN
Times returns 0 on success, otherwise -1 with the error code stored into the global variable errno. ERRORS
The following error code may be set in errno: [EFAULT] The address specified by the buffer parameter is not in a valid part of the process address space. SEE ALSO
time(1), wait(2), time(2). 4th Berkeley Distribution May 9, 1985 TIMES(2)
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