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MINOR: tools: provide an rdtsc() function for time comparisons

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This one returns a timestamp, either the one from the CPU or from
gettimeofday() in 64-bit format. The purpose is to be able to compare
timestamps on various entities to make it easier to detect updates.
It can also be used for benchmarking in certain situations during
development.
This commit is contained in:
Willy Tarreau 2015-04-29 17:13:35 +02:00
parent f95bc8e3e0
commit e6e49cfa93
1 changed files with 20 additions and 0 deletions
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20
include/common/standard.h
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@ -25,6 +25,7 @@
#include <limits.h>
#include <string.h>
#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
@ -959,4 +960,23 @@ static inline unsigned char utf8_return_length(unsigned char code)
return code & 0x0f;
}
/* returns a 64-bit a timestamp with the finest resolution available. The
* unit is intentionally not specified. It's mostly used to compare dates.
*/
#if defined(__i386__) || defined(__x86_64__)
static inline unsigned long long rdtsc()
{
unsigned int a, d;
asm volatile("rdtsc" : "=a" (a), "=d" (d));
return a + ((unsigned long long)d << 32);
}
#else
static inline unsigned long long rdtsc()
{
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000000 + tv.tv_usec;
}
#endif
#endif /* _COMMON_STANDARD_H */