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https://www.ibm.com/docs/SSLTBW_2.3.0/com.ibm.zos.v2r3.bpxbd00/rttims.htm
谦虚好学的皮带
1 年前
Points to a memory location where times() can store a structure of information describing processor time used by the current process and other related processes.
times() returns information in a tms structure, which has the following elements:
clock_t tms_utime
Amount of processor time used by instructions in the calling process.

Under z/OS® UNIX , this does not include processor time spent running in the kernel. It does include any processor time accumulated for the address space before it became a z/OS UNIX process.

clock_t tms_stime
Amount of processor time used by the system.

Under z/OS UNIX , this value represents kernel busy time running on behalf of the calling process. It does not include processor time performing other MVS™ system functions on behalf of the process.

clock_t tms_cutime
The sum of tms_utime and tms_cutime values for all waited-for child processes which have terminated.
clock_t tms_cstime
The sum of tms_stime and tms_cstime values for all terminated child processes of the calling process.

clock_t is an integral type determined in the time.h header file. It measures times in terms of clock ticks . The number of clock ticks in a second (for your installation) can be found in sysconf(_SC_CLK_TCK) .

Times for a terminated child can be determined once wait() or waitpid() have reported the child's termination.

Pthreads can not be separately clocked by the times() function because they do not run in a separate process like forked children do.

Returned value

If successful, times() returns a value giving the elapsed time since the process was last invoked (for example, at system startup). If this time value cannot be determined, times() returns ( clock_t ) -1.

unsuccessful, times() sets errno to one of the following values:
Error Code
Description
ERANGE
An overflow having occurred computing time values.
This example provides the amount of processor time used by instructions and the system for the parent and child processes. #define _POSIX_SOURCE #include <sys/times.h> #include <time.h> #include <sys/types.h> #include <sys/wait.h> #include <stdio.h> #include <unistd.h> main() { int status; long i, j; struct tms t; clock_t dub; int tics_per_second; tics_per_second = sysconf(_SC_CLK_TCK); if (fork() == 0) { for (i=0, j=0; i<1000000; i++) j += i; exit(0); if (wait(&status) == -1) perror("wait() error"); else if (!WIFEXITED(status)) puts("Child did not exit successfully"); else if ((dub = times(&t)) == -1) perror("times() error"); else { printf("process was dubbed %f seconds ago.\n\n", ((double) dub)/tics_per_second); printf(" utime stime\n"); printf("parent: %f %f\n", ((double) t.tms_utime)/tics_per_second, ((double) t.tms_stime)/tics_per_second); printf("child: %f %f\n", ((double) t.tms_cutime)/tics_per_second, ((double) t.tms_cstime)/tics_per_second);
Output 
process was dubbed 1.600000 seconds ago.
            utime           stime
parent:    0.000000        0.020000
child:     0.320000        0.000000

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