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Issue #9079: Added _PyTime_gettimeofday(_PyTime_timeval *tp) to C API

Browse source 
exposed in Python.h.  This function is similar to POSIX
gettimeofday(struct timeval *tp), but available on platforms without
gettimeofday().
This commit is contained in:
Alexander Belopolsky 2010-08-05 17:34:27 +00:00
parent 1c5471f319
commit 6fc4ade2bb
8 changed files with 150 additions and 85 deletions
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1
Include/Python.h
View file

@ -61,6 +61,7 @@
#error "PYMALLOC_DEBUG requires WITH_PYMALLOC"
#endif
#include "pymath.h"
#include "pytime.h"
#include "pymem.h"
#include "object.h"

70
Include/pytime.h Normal file
View file

@ -0,0 +1,70 @@
#ifndef Py_PYTIME_H
#define Py_PYTIME_H
#include "pyconfig.h" /* include for defines */
/**************************************************************************
Symbols and macros to supply platform-independent interfaces to time related
functions and constants
**************************************************************************/
#ifdef __cplusplus
extern "C" {
#endif
#ifdef HAVE_GETTIMEOFDAY
typedef struct timeval _PyTime_timeval;
#else
typedef struct {
time_t tv_sec; /* seconds since Jan. 1, 1970 */
long tv_usec; /* and microseconds */
} _PyTime_timeval;
#endif
/* Similar to POSIX gettimeofday but cannot fail. If system gettimeofday
* fails or is not available, fall back to lower resolution clocks.
*/
PyAPI_FUNC(void) _PyTime_gettimeofday(_PyTime_timeval *tp);
/* Dummy to force linking. */
PyAPI_FUNC(void) _PyTime_Init(void);
#ifdef __cplusplus
}
#endif
#endif /* Py_PYTIME_H */
#ifndef Py_PYTIME_H
#define Py_PYTIME_H
#include "pyconfig.h" /* include for defines */
/**************************************************************************
Symbols and macros to supply platform-independent interfaces to time related
functions and constants
**************************************************************************/
#ifdef __cplusplus
extern "C" {
#endif
#ifdef HAVE_GETTIMEOFDAY
typedef struct timeval _PyTime_timeval;
#else
typedef struct {
time_t tv_sec; /* seconds since Jan. 1, 1970 */
long tv_usec; /* and microseconds */
} _PyTime_timeval;
#endif
/* Similar to POSIX gettimeofday but cannot fail. If system gettimeofday
* fails or is not available, fall back to lower resolution clocks.
*/
PyAPI_FUNC(void) _PyTime_gettimeofday(_PyTime_timeval *tp);
/* Dummy to force linking. */
PyAPI_FUNC(void) _PyTime_Init(void);
#ifdef __cplusplus
}
#endif
#endif /* Py_PYTIME_H */

2
Makefile.pre.in
View file

@ -314,6 +314,7 @@ PYTHON_OBJS= \
Python/pymath.o \
Python/pystate.o \
Python/pythonrun.o \
Python/pytime.o \
Python/structmember.o \
Python/symtable.o \
Python/sysmodule.o \
@ -696,6 +697,7 @@ PYTHON_HEADERS= \
Include/pystrtod.h \
Include/pythonrun.h \
Include/pythread.h \
Include/pytime.h \
Include/rangeobject.h \
Include/setobject.h \
Include/sliceobject.h \

33
Modules/_datetimemodule.c
View file

@ -8,7 +8,7 @@
#include <time.h>
#include "timefuncs.h"
#include "_time.h"
/* Differentiate between building the core module and building extension
* modules.
@ -4166,37 +4166,10 @@ datetime_from_timestamp(PyObject *cls, TM_FUNC f, double timestamp,
static PyObject *
datetime_best_possible(PyObject *cls, TM_FUNC f, PyObject *tzinfo)
{
#ifdef HAVE_GETTIMEOFDAY
struct timeval t;
#ifdef GETTIMEOFDAY_NO_TZ
gettimeofday(&t);
#else
gettimeofday(&t, (struct timezone *)NULL);
#endif
_PyTime_timeval t;
_PyTime_gettimeofday(&t);
return datetime_from_timet_and_us(cls, f, t.tv_sec, (int)t.tv_usec,
tzinfo);
#else /* ! HAVE_GETTIMEOFDAY */
/* No flavor of gettimeofday exists on this platform. Python's
* time.time() does a lot of other platform tricks to get the
* best time it can on the platform, and we're not going to do
* better than that (if we could, the better code would belong
* in time.time()!) We're limited by the precision of a double,
* though.
*/
PyObject *time;
double dtime;
time = time_time();
if (time == NULL)
return NULL;
dtime = PyFloat_AsDouble(time);
Py_DECREF(time);
if (dtime == -1.0 && PyErr_Occurred())
return NULL;
return datetime_from_timestamp(cls, f, dtime, tzinfo);
#endif /* ! HAVE_GETTIMEOFDAY */
}
/* Return best possible local time -- this isn't constrained by the

59
Modules/timemodule.c
View file

@ -3,22 +3,10 @@
#include "Python.h"
#include "structseq.h"
#include "timefuncs.h"
#include "_time.h"
#define TZNAME_ENCODING "utf-8"
#ifdef __APPLE__
#if defined(HAVE_GETTIMEOFDAY) && defined(HAVE_FTIME)
/*
* floattime falls back to ftime when getttimeofday fails because the latter
* might fail on some platforms. This fallback is unwanted on MacOSX because
* that makes it impossible to use a binary build on OSX 10.4 on earlier
* releases of the OS. Therefore claim we don't support ftime.
*/
# undef HAVE_FTIME
#endif
#endif
#include <ctype.h>
#ifdef HAVE_SYS_TYPES_H
@ -29,13 +17,6 @@
#include <io.h>
#endif
#ifdef HAVE_FTIME
#include <sys/timeb.h>
#if !defined(MS_WINDOWS) && !defined(PYOS_OS2)
extern int ftime(struct timeb *);
#endif /* MS_WINDOWS */
#endif /* HAVE_FTIME */
#if defined(__WATCOMC__) && !defined(__QNX__)
#include <i86.h>
#else
@ -946,44 +927,12 @@ PyInit_time(void)
return m;
}
/* Implement floattime() for various platforms */
static double
floattime(void)
{
/* There are three ways to get the time:
(1) gettimeofday() -- resolution in microseconds
(2) ftime() -- resolution in milliseconds
(3) time() -- resolution in seconds
In all cases the return value is a float in seconds.
Since on some systems (e.g. SCO ODT 3.0) gettimeofday() may
fail, so we fall back on ftime() or time().
Note: clock resolution does not imply clock accuracy! */
#ifdef HAVE_GETTIMEOFDAY
{
struct timeval t;
#ifdef GETTIMEOFDAY_NO_TZ
if (gettimeofday(&t) == 0)
return (double)t.tv_sec + t.tv_usec*0.000001;
#else /* !GETTIMEOFDAY_NO_TZ */
if (gettimeofday(&t, (struct timezone *)NULL) == 0)
return (double)t.tv_sec + t.tv_usec*0.000001;
#endif /* !GETTIMEOFDAY_NO_TZ */
}
#endif /* !HAVE_GETTIMEOFDAY */
{
#if defined(HAVE_FTIME)
struct timeb t;
ftime(&t);
return (double)t.time + (double)t.millitm * (double)0.001;
#else /* !HAVE_FTIME */
time_t secs;
time(&secs);
return (double)secs;
#endif /* !HAVE_FTIME */
}
_PyTime_timeval t;
_PyTime_gettimeofday(&t);
return (double)t.tv_sec + t.tv_usec*0.000001;
}

8
PCbuild/pythoncore.vcproj
View file

@ -875,6 +875,10 @@
RelativePath="..\Include\pymath.h"
>
</File>
<File
RelativePath="..\Include\pytime.h"
>
</File>
<File
RelativePath="..\Include\pymem.h"
>
@ -1767,6 +1771,10 @@
RelativePath="..\Python\pymath.c"
>
</File>
<File
RelativePath="..\Python\pytime.c"
>
</File>
<File
RelativePath="..\Python\pystate.c"
>

2
Python/pythonrun.c
View file

@ -268,6 +268,8 @@ Py_InitializeEx(int install_sigs)
/* Initialize _warnings. */
_PyWarnings_Init();
_PyTime_Init();
initfsencoding();
if (install_sigs)

60
Python/pytime.c Normal file
View file

@ -0,0 +1,60 @@
#include "Python.h"
#ifdef __APPLE__
#if defined(HAVE_GETTIMEOFDAY) && defined(HAVE_FTIME)
/*
* _PyTime_gettimeofday falls back to ftime when getttimeofday fails because the latter
* might fail on some platforms. This fallback is unwanted on MacOSX because
* that makes it impossible to use a binary build on OSX 10.4 on earlier
* releases of the OS. Therefore claim we don't support ftime.
*/
# undef HAVE_FTIME
#endif
#endif
#ifdef HAVE_FTIME
#include <sys/timeb.h>
#if !defined(MS_WINDOWS) && !defined(PYOS_OS2)
extern int ftime(struct timeb *);
#endif /* MS_WINDOWS */
#endif /* HAVE_FTIME */
void
_PyTime_gettimeofday(_PyTime_timeval *tp)
{
/* There are three ways to get the time:
(1) gettimeofday() -- resolution in microseconds
(2) ftime() -- resolution in milliseconds
(3) time() -- resolution in seconds
In all cases the return value in a timeval struct.
Since on some systems (e.g. SCO ODT 3.0) gettimeofday() may
fail, so we fall back on ftime() or time().
Note: clock resolution does not imply clock accuracy! */
#ifdef HAVE_GETTIMEOFDAY
#ifdef GETTIMEOFDAY_NO_TZ
if (gettimeofday(tp) == 0)
return;
#else /* !GETTIMEOFDAY_NO_TZ */
if (gettimeofday(tp, (struct timezone *)NULL) == 0)
return;
#endif /* !GETTIMEOFDAY_NO_TZ */
#endif /* !HAVE_GETTIMEOFDAY */
#if defined(HAVE_FTIME)
{
struct timeb t;
ftime(&t);
tp->tv_sec = t.time;
tp->tv_usec = t.millitm * 1000;
}
#else /* !HAVE_FTIME */
tp->tv_sec = time(NULL);
tp->tv_usec = 0;
#endif /* !HAVE_FTIME */
return;
}
void
_PyTime_Init()
{
/* Do nothing. Needed to force linking. */
}