профиль времени выполнения (execution time profile)
Имя (Name)
profil - execution time profile
Синопсис (Synopsis)
#include <unistd.h>
int profil(unsigned short *buf, size_t bufsiz,
size_t offset, unsigned int scale);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
profil():
Since glibc 2.21:
_DEFAULT_SOURCE
In glibc 2.19 and 2.20:
_DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
Up to and including glibc 2.19:
_BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
Описание (Description)
This routine provides a means to find out in what areas your
program spends most of its time. The argument buf points to
bufsiz bytes of core. Every virtual 10 milliseconds, the user's
program counter (PC) is examined: offset is subtracted and the
result is multiplied by scale and divided by 65536. If the
resulting value is less than bufsiz, then the corresponding entry
in buf is incremented. If buf is NULL, profiling is disabled.
Возвращаемое значение (Return value)
Zero is always returned.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌────────────────────────────────────┬───────────────┬───────────┐
│Interface │ Attribute │ Value │
├────────────────────────────────────┼───────────────┼───────────┤
│profil() │ Thread safety │ MT-Unsafe │
└────────────────────────────────────┴───────────────┴───────────┘
Стандарты (Conforming to)
Similar to a call in SVr4 (but not POSIX.1).
Ошибки (баги) (Bugs)
profil() cannot be used on a program that also uses ITIMER_PROF
interval timers (see setitimer(2)).
True kernel profiling provides more accurate results.
Смотри также (See also)
gprof(1), sprof(1), setitimer(2), sigaction(2), signal(2)
