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_hotshot.c
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1643 lines (1481 loc) · 47.6 KB
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/*
* This is the High Performance Python Profiler portion of HotShot.
*/
#include "Python.h"
#include "code.h"
#include "eval.h"
#include "frameobject.h"
#include "structmember.h"
/*
* Which timer to use should be made more configurable, but that should not
* be difficult. This will do for now.
*/
#ifdef MS_WINDOWS
#include <windows.h>
#ifdef HAVE_DIRECT_H
#include <direct.h> /* for getcwd() */
#endif
typedef __int64 hs_time;
#define GETTIMEOFDAY(P_HS_TIME) \
{ LARGE_INTEGER _temp; \
QueryPerformanceCounter(&_temp); \
*(P_HS_TIME) = _temp.QuadPart; }
#else
#ifndef HAVE_GETTIMEOFDAY
#error "This module requires gettimeofday() on non-Windows platforms!"
#endif
#if (defined(PYOS_OS2) && defined(PYCC_GCC)) || defined(__QNX__)
#include <sys/time.h>
#else
#include <sys/resource.h>
#include <sys/times.h>
#endif
typedef struct timeval hs_time;
#endif
#if !defined(__cplusplus) && !defined(inline)
#ifdef __GNUC__
#define inline __inline
#endif
#endif
#ifndef inline
#define inline
#endif
#define BUFFERSIZE 10240
#if defined(PYOS_OS2) && defined(PYCC_GCC)
#define PATH_MAX 260
#endif
#if defined(__sgi) && _COMPILER_VERSION>700 && !defined(PATH_MAX)
/* fix PATH_MAX not being defined with MIPSPro 7.x
if mode is ANSI C (default) */
#define PATH_MAX 1024
#endif
#ifndef PATH_MAX
# ifdef MAX_PATH
# define PATH_MAX MAX_PATH
# elif defined (_POSIX_PATH_MAX)
# define PATH_MAX _POSIX_PATH_MAX
# else
# error "Need a defn. for PATH_MAX in _hotshot.c"
# endif
#endif
typedef struct {
PyObject_HEAD
PyObject *filemap;
PyObject *logfilename;
Py_ssize_t index;
unsigned char buffer[BUFFERSIZE];
FILE *logfp;
int lineevents;
int linetimings;
int frametimings;
/* size_t filled; */
int active;
int next_fileno;
hs_time prev_timeofday;
} ProfilerObject;
typedef struct {
PyObject_HEAD
PyObject *info;
FILE *logfp;
int linetimings;
int frametimings;
} LogReaderObject;
static PyObject * ProfilerError = NULL;
#ifndef MS_WINDOWS
#ifdef GETTIMEOFDAY_NO_TZ
#define GETTIMEOFDAY(ptv) gettimeofday((ptv))
#else
#define GETTIMEOFDAY(ptv) gettimeofday((ptv), (struct timezone *)NULL)
#endif
#endif
/* The log reader... */
PyDoc_STRVAR(logreader_close__doc__,
"close()\n"
"Close the log file, preventing additional records from being read.");
static PyObject *
logreader_close(LogReaderObject *self, PyObject *args)
{
if (self->logfp != NULL) {
fclose(self->logfp);
self->logfp = NULL;
}
Py_INCREF(Py_None);
return Py_None;
}
PyDoc_STRVAR(logreader_fileno__doc__,
"fileno() -> file descriptor\n"
"Returns the file descriptor for the log file, if open.\n"
"Raises ValueError if the log file is closed.");
static PyObject *
logreader_fileno(LogReaderObject *self)
{
if (self->logfp == NULL) {
PyErr_SetString(PyExc_ValueError,
"logreader's file object already closed");
return NULL;
}
return PyInt_FromLong(fileno(self->logfp));
}
/* Log File Format
* ---------------
*
* The log file consists of a sequence of variable-length records.
* Each record is identified with a record type identifier in two
* bits of the first byte. The two bits are the "least significant"
* bits of the byte.
*
* Low bits: Opcode: Meaning:
* 0x00 ENTER enter a frame
* 0x01 EXIT exit a frame
* 0x02 LINENO execution moved onto a different line
* 0x03 OTHER more bits are needed to deecode
*
* If the type is OTHER, the record is not packed so tightly, and the
* remaining bits are used to disambiguate the record type. These
* records are not used as frequently so compaction is not an issue.
* Each of the first three record types has a highly tailored
* structure that allows it to be packed tightly.
*
* The OTHER records have the following identifiers:
*
* First byte: Opcode: Meaning:
* 0x13 ADD_INFO define a key/value pair
* 0x23 DEFINE_FILE define an int->filename mapping
* 0x33 LINE_TIMES indicates if LINENO events have tdeltas
* 0x43 DEFINE_FUNC define a (fileno,lineno)->funcname mapping
* 0x53 FRAME_TIMES indicates if ENTER/EXIT events have tdeltas
*
* Packed Integers
*
* "Packed integers" are non-negative integer values encoded as a
* sequence of bytes. Each byte is encoded such that the most
* significant bit is set if the next byte is also part of the
* integer. Each byte provides bits to the least-significant end of
* the result; the accumulated value must be shifted up to place the
* new bits into the result.
*
* "Modified packed integers" are packed integers where only a portion
* of the first byte is used. In the rest of the specification, these
* are referred to as "MPI(n,name)", where "n" is the number of bits
* discarded from the least-signicant positions of the byte, and
* "name" is a name being given to those "discarded" bits, since they
* are a field themselves.
*
* ENTER records:
*
* MPI(2,type) fileno -- type is 0x00
* PI lineno
* PI tdelta -- iff frame times are enabled
*
* EXIT records
*
* MPI(2,type) tdelta -- type is 0x01; tdelta will be 0
* if frame times are disabled
*
* LINENO records
*
* MPI(2,type) lineno -- type is 0x02
* PI tdelta -- iff LINENO includes it
*
* ADD_INFO records
*
* BYTE type -- always 0x13
* PI len1 -- length of first string
* BYTE string1[len1] -- len1 bytes of string data
* PI len2 -- length of second string
* BYTE string2[len2] -- len2 bytes of string data
*
* DEFINE_FILE records
*
* BYTE type -- always 0x23
* PI fileno
* PI len -- length of filename
* BYTE filename[len] -- len bytes of string data
*
* DEFINE_FUNC records
*
* BYTE type -- always 0x43
* PI fileno
* PI lineno
* PI len -- length of funcname
* BYTE funcname[len] -- len bytes of string data
*
* LINE_TIMES records
*
* This record can be used only before the start of ENTER/EXIT/LINENO
* records. If have_tdelta is true, LINENO records will include the
* tdelta field, otherwise it will be omitted. If this record is not
* given, LINENO records will not contain the tdelta field.
*
* BYTE type -- always 0x33
* BYTE have_tdelta -- 0 if LINENO does *not* have
* timing information
* FRAME_TIMES records
*
* This record can be used only before the start of ENTER/EXIT/LINENO
* records. If have_tdelta is true, ENTER and EXIT records will
* include the tdelta field, otherwise it will be omitted. If this
* record is not given, ENTER and EXIT records will contain the tdelta
* field.
*
* BYTE type -- always 0x53
* BYTE have_tdelta -- 0 if ENTER/EXIT do *not* have
* timing information
*/
#define WHAT_ENTER 0x00
#define WHAT_EXIT 0x01
#define WHAT_LINENO 0x02
#define WHAT_OTHER 0x03 /* only used in decoding */
#define WHAT_ADD_INFO 0x13
#define WHAT_DEFINE_FILE 0x23
#define WHAT_LINE_TIMES 0x33
#define WHAT_DEFINE_FUNC 0x43
#define WHAT_FRAME_TIMES 0x53
#define ERR_NONE 0
#define ERR_EOF -1
#define ERR_EXCEPTION -2
#define ERR_BAD_RECTYPE -3
#define PISIZE (sizeof(int) + 1)
#define MPISIZE (PISIZE + 1)
/* Maximum size of "normal" events -- nothing that contains string data */
#define MAXEVENTSIZE (MPISIZE + PISIZE*2)
/* Unpack a packed integer; if "discard" is non-zero, unpack a modified
* packed integer with "discard" discarded bits.
*/
static int
unpack_packed_int(LogReaderObject *self, int *pvalue, int discard)
{
int c;
int accum = 0;
int bits = 0;
int cont;
do {
/* read byte */
if ((c = fgetc(self->logfp)) == EOF)
return ERR_EOF;
accum |= ((c & 0x7F) >> discard) << bits;
bits += (7 - discard);
cont = c & 0x80;
discard = 0;
} while (cont);
*pvalue = accum;
return 0;
}
/* Unpack a string, which is encoded as a packed integer giving the
* length of the string, followed by the string data.
*/
static int
unpack_string(LogReaderObject *self, PyObject **pvalue)
{
int i;
int len;
int err;
int ch;
char *buf;
if ((err = unpack_packed_int(self, &len, 0)))
return err;
buf = (char *)malloc(len);
if (!buf) {
PyErr_NoMemory();
return ERR_EXCEPTION;
}
for (i=0; i < len; i++) {
ch = fgetc(self->logfp);
buf[i] = ch;
if (ch == EOF) {
free(buf);
return ERR_EOF;
}
}
*pvalue = PyString_FromStringAndSize(buf, len);
free(buf);
if (*pvalue == NULL) {
return ERR_EXCEPTION;
}
return 0;
}
static int
unpack_add_info(LogReaderObject *self)
{
PyObject *key;
PyObject *value = NULL;
int err;
err = unpack_string(self, &key);
if (!err) {
err = unpack_string(self, &value);
if (err)
Py_DECREF(key);
else {
PyObject *list = PyDict_GetItem(self->info, key);
if (list == NULL) {
list = PyList_New(0);
if (list == NULL) {
err = ERR_EXCEPTION;
goto finally;
}
if (PyDict_SetItem(self->info, key, list)) {
Py_DECREF(list);
err = ERR_EXCEPTION;
goto finally;
}
Py_DECREF(list);
}
if (PyList_Append(list, value))
err = ERR_EXCEPTION;
}
}
finally:
Py_XDECREF(key);
Py_XDECREF(value);
return err;
}
static void
eof_error(LogReaderObject *self)
{
fclose(self->logfp);
self->logfp = NULL;
PyErr_SetString(PyExc_EOFError,
"end of file with incomplete profile record");
}
static PyObject *
logreader_tp_iternext(LogReaderObject *self)
{
int c;
int what;
int err = ERR_NONE;
int lineno = -1;
int fileno = -1;
int tdelta = -1;
PyObject *s1 = NULL, *s2 = NULL;
PyObject *result = NULL;
#if 0
unsigned char b0, b1;
#endif
if (self->logfp == NULL) {
PyErr_SetString(ProfilerError,
"cannot iterate over closed LogReader object");
return NULL;
}
restart:
/* decode the record type */
if ((c = fgetc(self->logfp)) == EOF) {
fclose(self->logfp);
self->logfp = NULL;
return NULL;
}
what = c & WHAT_OTHER;
if (what == WHAT_OTHER)
what = c; /* need all the bits for type */
else
ungetc(c, self->logfp); /* type byte includes packed int */
switch (what) {
case WHAT_ENTER:
err = unpack_packed_int(self, &fileno, 2);
if (!err) {
err = unpack_packed_int(self, &lineno, 0);
if (self->frametimings && !err)
err = unpack_packed_int(self, &tdelta, 0);
}
break;
case WHAT_EXIT:
err = unpack_packed_int(self, &tdelta, 2);
break;
case WHAT_LINENO:
err = unpack_packed_int(self, &lineno, 2);
if (self->linetimings && !err)
err = unpack_packed_int(self, &tdelta, 0);
break;
case WHAT_ADD_INFO:
err = unpack_add_info(self);
break;
case WHAT_DEFINE_FILE:
err = unpack_packed_int(self, &fileno, 0);
if (!err) {
err = unpack_string(self, &s1);
if (!err) {
Py_INCREF(Py_None);
s2 = Py_None;
}
}
break;
case WHAT_DEFINE_FUNC:
err = unpack_packed_int(self, &fileno, 0);
if (!err) {
err = unpack_packed_int(self, &lineno, 0);
if (!err)
err = unpack_string(self, &s1);
}
break;
case WHAT_LINE_TIMES:
if ((c = fgetc(self->logfp)) == EOF)
err = ERR_EOF;
else {
self->linetimings = c ? 1 : 0;
goto restart;
}
break;
case WHAT_FRAME_TIMES:
if ((c = fgetc(self->logfp)) == EOF)
err = ERR_EOF;
else {
self->frametimings = c ? 1 : 0;
goto restart;
}
break;
default:
err = ERR_BAD_RECTYPE;
}
if (err == ERR_BAD_RECTYPE) {
PyErr_SetString(PyExc_ValueError,
"unknown record type in log file");
}
else if (err == ERR_EOF) {
eof_error(self);
}
else if (!err) {
result = PyTuple_New(4);
if (result == NULL)
return NULL;
PyTuple_SET_ITEM(result, 0, PyInt_FromLong(what));
PyTuple_SET_ITEM(result, 2, PyInt_FromLong(fileno));
if (s1 == NULL)
PyTuple_SET_ITEM(result, 1, PyInt_FromLong(tdelta));
else
PyTuple_SET_ITEM(result, 1, s1);
if (s2 == NULL)
PyTuple_SET_ITEM(result, 3, PyInt_FromLong(lineno));
else
PyTuple_SET_ITEM(result, 3, s2);
}
/* The only other case is err == ERR_EXCEPTION, in which case the
* exception is already set.
*/
#if 0
b0 = self->buffer[self->index];
b1 = self->buffer[self->index + 1];
if (b0 & 1) {
/* This is a line-number event. */
what = PyTrace_LINE;
lineno = ((b0 & ~1) << 7) + b1;
self->index += 2;
}
else {
what = (b0 & 0x0E) >> 1;
tdelta = ((b0 & 0xF0) << 4) + b1;
if (what == PyTrace_CALL) {
/* we know there's a 2-byte file ID & 2-byte line number */
fileno = ((self->buffer[self->index + 2] << 8)
+ self->buffer[self->index + 3]);
lineno = ((self->buffer[self->index + 4] << 8)
+ self->buffer[self->index + 5]);
self->index += 6;
}
else
self->index += 2;
}
#endif
return result;
}
static void
logreader_dealloc(LogReaderObject *self)
{
if (self->logfp != NULL) {
fclose(self->logfp);
self->logfp = NULL;
}
Py_XDECREF(self->info);
PyObject_Del(self);
}
static PyObject *
logreader_sq_item(LogReaderObject *self, Py_ssize_t index)
{
PyObject *result = logreader_tp_iternext(self);
if (result == NULL && !PyErr_Occurred()) {
PyErr_SetString(PyExc_IndexError, "no more events in log");
return NULL;
}
return result;
}
static void
do_stop(ProfilerObject *self);
static int
flush_data(ProfilerObject *self)
{
/* Need to dump data to the log file... */
size_t written = fwrite(self->buffer, 1, self->index, self->logfp);
if (written == (size_t)self->index)
self->index = 0;
else {
memmove(self->buffer, &self->buffer[written],
self->index - written);
self->index -= written;
if (written == 0) {
char *s = PyString_AsString(self->logfilename);
PyErr_SetFromErrnoWithFilename(PyExc_IOError, s);
do_stop(self);
return -1;
}
}
if (written > 0) {
if (fflush(self->logfp)) {
char *s = PyString_AsString(self->logfilename);
PyErr_SetFromErrnoWithFilename(PyExc_IOError, s);
do_stop(self);
return -1;
}
}
return 0;
}
static inline int
pack_packed_int(ProfilerObject *self, int value)
{
unsigned char partial;
do {
partial = value & 0x7F;
value >>= 7;
if (value)
partial |= 0x80;
self->buffer[self->index] = partial;
self->index++;
} while (value);
return 0;
}
/* Encode a modified packed integer, with a subfield of modsize bits
* containing the value "subfield". The value of subfield is not
* checked to ensure it actually fits in modsize bits.
*/
static inline int
pack_modified_packed_int(ProfilerObject *self, int value,
int modsize, int subfield)
{
const int maxvalues[] = {-1, 1, 3, 7, 15, 31, 63, 127};
int bits = 7 - modsize;
int partial = value & maxvalues[bits];
unsigned char b = subfield | (partial << modsize);
if (partial != value) {
b |= 0x80;
self->buffer[self->index] = b;
self->index++;
return pack_packed_int(self, value >> bits);
}
self->buffer[self->index] = b;
self->index++;
return 0;
}
static int
pack_string(ProfilerObject *self, const char *s, Py_ssize_t len)
{
if (len + PISIZE + self->index >= BUFFERSIZE) {
if (flush_data(self) < 0)
return -1;
}
assert(len < INT_MAX);
if (pack_packed_int(self, (int)len) < 0)
return -1;
memcpy(self->buffer + self->index, s, len);
self->index += len;
return 0;
}
static int
pack_add_info(ProfilerObject *self, const char *s1, const char *s2)
{
Py_ssize_t len1 = strlen(s1);
Py_ssize_t len2 = strlen(s2);
if (len1 + len2 + PISIZE*2 + 1 + self->index >= BUFFERSIZE) {
if (flush_data(self) < 0)
return -1;
}
self->buffer[self->index] = WHAT_ADD_INFO;
self->index++;
if (pack_string(self, s1, len1) < 0)
return -1;
return pack_string(self, s2, len2);
}
static int
pack_define_file(ProfilerObject *self, int fileno, const char *filename)
{
Py_ssize_t len = strlen(filename);
if (len + PISIZE*2 + 1 + self->index >= BUFFERSIZE) {
if (flush_data(self) < 0)
return -1;
}
self->buffer[self->index] = WHAT_DEFINE_FILE;
self->index++;
if (pack_packed_int(self, fileno) < 0)
return -1;
return pack_string(self, filename, len);
}
static int
pack_define_func(ProfilerObject *self, int fileno, int lineno,
const char *funcname)
{
Py_ssize_t len = strlen(funcname);
if (len + PISIZE*3 + 1 + self->index >= BUFFERSIZE) {
if (flush_data(self) < 0)
return -1;
}
self->buffer[self->index] = WHAT_DEFINE_FUNC;
self->index++;
if (pack_packed_int(self, fileno) < 0)
return -1;
if (pack_packed_int(self, lineno) < 0)
return -1;
return pack_string(self, funcname, len);
}
static int
pack_line_times(ProfilerObject *self)
{
if (2 + self->index >= BUFFERSIZE) {
if (flush_data(self) < 0)
return -1;
}
self->buffer[self->index] = WHAT_LINE_TIMES;
self->buffer[self->index + 1] = self->linetimings ? 1 : 0;
self->index += 2;
return 0;
}
static int
pack_frame_times(ProfilerObject *self)
{
if (2 + self->index >= BUFFERSIZE) {
if (flush_data(self) < 0)
return -1;
}
self->buffer[self->index] = WHAT_FRAME_TIMES;
self->buffer[self->index + 1] = self->frametimings ? 1 : 0;
self->index += 2;
return 0;
}
static inline int
pack_enter(ProfilerObject *self, int fileno, int tdelta, int lineno)
{
if (MPISIZE + PISIZE*2 + self->index >= BUFFERSIZE) {
if (flush_data(self) < 0)
return -1;
}
pack_modified_packed_int(self, fileno, 2, WHAT_ENTER);
pack_packed_int(self, lineno);
if (self->frametimings)
return pack_packed_int(self, tdelta);
else
return 0;
}
static inline int
pack_exit(ProfilerObject *self, int tdelta)
{
if (MPISIZE + self->index >= BUFFERSIZE) {
if (flush_data(self) < 0)
return -1;
}
if (self->frametimings)
return pack_modified_packed_int(self, tdelta, 2, WHAT_EXIT);
self->buffer[self->index] = WHAT_EXIT;
self->index++;
return 0;
}
static inline int
pack_lineno(ProfilerObject *self, int lineno)
{
if (MPISIZE + self->index >= BUFFERSIZE) {
if (flush_data(self) < 0)
return -1;
}
return pack_modified_packed_int(self, lineno, 2, WHAT_LINENO);
}
static inline int
pack_lineno_tdelta(ProfilerObject *self, int lineno, int tdelta)
{
if (MPISIZE + PISIZE + self->index >= BUFFERSIZE) {
if (flush_data(self) < 0)
return 0;
}
if (pack_modified_packed_int(self, lineno, 2, WHAT_LINENO) < 0)
return -1;
return pack_packed_int(self, tdelta);
}
static inline int
get_fileno(ProfilerObject *self, PyCodeObject *fcode)
{
/* This is only used for ENTER events. */
PyObject *obj;
PyObject *dict;
int fileno;
obj = PyDict_GetItem(self->filemap, fcode->co_filename);
if (obj == NULL) {
/* first sighting of this file */
dict = PyDict_New();
if (dict == NULL) {
return -1;
}
fileno = self->next_fileno;
obj = Py_BuildValue("iN", fileno, dict);
if (obj == NULL) {
return -1;
}
if (PyDict_SetItem(self->filemap, fcode->co_filename, obj)) {
Py_DECREF(obj);
return -1;
}
self->next_fileno++;
Py_DECREF(obj);
if (pack_define_file(self, fileno,
PyString_AS_STRING(fcode->co_filename)) < 0)
return -1;
}
else {
/* already know this ID */
fileno = PyInt_AS_LONG(PyTuple_GET_ITEM(obj, 0));
dict = PyTuple_GET_ITEM(obj, 1);
}
/* make sure we save a function name for this (fileno, lineno) */
obj = PyInt_FromLong(fcode->co_firstlineno);
if (obj == NULL) {
/* We just won't have it saved; too bad. */
PyErr_Clear();
}
else {
PyObject *name = PyDict_GetItem(dict, obj);
if (name == NULL) {
if (pack_define_func(self, fileno, fcode->co_firstlineno,
PyString_AS_STRING(fcode->co_name)) < 0) {
Py_DECREF(obj);
return -1;
}
if (PyDict_SetItem(dict, obj, fcode->co_name)) {
Py_DECREF(obj);
return -1;
}
}
Py_DECREF(obj);
}
return fileno;
}
static inline int
get_tdelta(ProfilerObject *self)
{
int tdelta;
#ifdef MS_WINDOWS
hs_time tv;
hs_time diff;
GETTIMEOFDAY(&tv);
diff = tv - self->prev_timeofday;
tdelta = (int)diff;
#else
struct timeval tv;
GETTIMEOFDAY(&tv);
tdelta = tv.tv_usec - self->prev_timeofday.tv_usec;
if (tv.tv_sec != self->prev_timeofday.tv_sec)
tdelta += (tv.tv_sec - self->prev_timeofday.tv_sec) * 1000000;
#endif
/* time can go backwards on some multiprocessor systems or by NTP */
if (tdelta < 0)
return 0;
self->prev_timeofday = tv;
return tdelta;
}
/* The workhorse: the profiler callback function. */
static int
tracer_callback(ProfilerObject *self, PyFrameObject *frame, int what,
PyObject *arg)
{
int fileno;
switch (what) {
case PyTrace_CALL:
fileno = get_fileno(self, frame->f_code);
if (fileno < 0)
return -1;
return pack_enter(self, fileno,
self->frametimings ? get_tdelta(self) : -1,
frame->f_code->co_firstlineno);
case PyTrace_RETURN:
return pack_exit(self, get_tdelta(self));
case PyTrace_LINE: /* we only get these events if we asked for them */
if (self->linetimings)
return pack_lineno_tdelta(self, frame->f_lineno,
get_tdelta(self));
else
return pack_lineno(self, frame->f_lineno);
default:
/* ignore PyTrace_EXCEPTION */
break;
}
return 0;
}
/* A couple of useful helper functions. */
#ifdef MS_WINDOWS
static LARGE_INTEGER frequency = {0, 0};
#endif
static unsigned long timeofday_diff = 0;
static unsigned long rusage_diff = 0;
static void
calibrate(void)
{
hs_time tv1, tv2;
#ifdef MS_WINDOWS
hs_time diff;
QueryPerformanceFrequency(&frequency);
#endif
GETTIMEOFDAY(&tv1);
while (1) {
GETTIMEOFDAY(&tv2);
#ifdef MS_WINDOWS
diff = tv2 - tv1;
if (diff != 0) {
timeofday_diff = (unsigned long)diff;
break;
}
#else
if (tv1.tv_sec != tv2.tv_sec || tv1.tv_usec != tv2.tv_usec) {
if (tv1.tv_sec == tv2.tv_sec)
timeofday_diff = tv2.tv_usec - tv1.tv_usec;
else
timeofday_diff = (1000000 - tv1.tv_usec) + tv2.tv_usec;
break;
}
#endif
}
#if defined(MS_WINDOWS) || defined(PYOS_OS2) || \
defined(__VMS) || defined (__QNX__)
rusage_diff = -1;
#else
{
struct rusage ru1, ru2;
getrusage(RUSAGE_SELF, &ru1);
while (1) {
getrusage(RUSAGE_SELF, &ru2);
if (ru1.ru_utime.tv_sec != ru2.ru_utime.tv_sec) {
rusage_diff = ((1000000 - ru1.ru_utime.tv_usec)
+ ru2.ru_utime.tv_usec);
break;
}
else if (ru1.ru_utime.tv_usec != ru2.ru_utime.tv_usec) {
rusage_diff = ru2.ru_utime.tv_usec - ru1.ru_utime.tv_usec;
break;
}
else if (ru1.ru_stime.tv_sec != ru2.ru_stime.tv_sec) {
rusage_diff = ((1000000 - ru1.ru_stime.tv_usec)
+ ru2.ru_stime.tv_usec);
break;
}
else if (ru1.ru_stime.tv_usec != ru2.ru_stime.tv_usec) {
rusage_diff = ru2.ru_stime.tv_usec - ru1.ru_stime.tv_usec;
break;
}
}
}
#endif
}
static void
do_start(ProfilerObject *self)
{
self->active = 1;
GETTIMEOFDAY(&self->prev_timeofday);
if (self->lineevents)
PyEval_SetTrace((Py_tracefunc) tracer_callback, (PyObject *)self);
else
PyEval_SetProfile((Py_tracefunc) tracer_callback, (PyObject *)self);
}
static void
do_stop(ProfilerObject *self)
{
if (self->active) {
self->active = 0;
if (self->lineevents)
PyEval_SetTrace(NULL, NULL);
else
PyEval_SetProfile(NULL, NULL);
}
if (self->index > 0) {
/* Best effort to dump out any remaining data. */
flush_data(self);
}
}
static int
is_available(ProfilerObject *self)
{
if (self->active) {
PyErr_SetString(ProfilerError, "profiler already active");
return 0;
}
if (self->logfp == NULL) {
PyErr_SetString(ProfilerError, "profiler already closed");
return 0;
}
return 1;