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#include <time.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <cstring>
#include "cpu_time.h"
#if _POSIX_C_SOURCE >= 199309L
// use clock_xxx() API
double get_cpu_usage(void)
{
struct timespec ts;
if (clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts) == 0)
{
return ts.tv_sec + ts.tv_nsec / 1E9;
}
else
return 0.0;
}
#else
// fall back to getrusage()
#ifdef RUSAGE_THREAD
// This is a Linuxism...
#define ACCOUNTING_SCOPE RUSAGE_THREAD
#else
// This is POSIX.
#define ACCOUNTING_SCOPE RUSAGE_SELF
#endif
double get_cpu_usage(void)
{
struct rusage u;
if (getrusage(ACCOUNTING_SCOPE, &u) == 0)
{
return u.ru_utime.tv_sec + u.ru_utime.tv_usec / 1E6;
}
else
return 0.0;
}
#endif
std::ostream& operator<<(std::ostream &os, const CPUClock &clock)
{
if (clock.get_function())
os << clock.get_function() << "::";
os << clock.get_name()
<< ": total=" << clock.get_total() * 1000 << "ms "
<< "last=" << clock.get_last() * 1000 << "ms "
<< "average=" << clock.get_average() * 1000 << "ms "
<< "count=" << clock.get_count();
return os;
}
char *strip_types(const char* pretty_func)
{
char *copy = strdup(pretty_func);
char *start = strchr(copy, ' ');
char *end = strchr(copy, '(');
if (start)
copy = start + 1;
if (end)
*end = '\0';
return copy;
}
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