/* Various utility functions.
- Copyright (C) 2003 Free Software Foundation, Inc.
+ Copyright (C) 2005 Free Software Foundation, Inc.
This file is part of GNU Wget.
return copy;
}
-/* Return a count of how many times CHR occurs in STRING. */
-
-int
-count_char (const char *string, char chr)
-{
- const char *p;
- int count = 0;
- for (p = string; *p; p++)
- if (*p == chr)
- ++count;
- return count;
-}
-
/* Copy the string formed by two pointers (one on the beginning, other
on the char after the last char) to a new, malloc-ed location.
0-terminate it. */
only one of the above constants will be defined. Virtually all
modern Unix systems will define TIMER_GETTIMEOFDAY; Windows will
use TIMER_WINDOWS. TIMER_TIME is a catch-all method for
- non-Windows systems without gettimeofday.
-
- #### Perhaps we should also support ftime(), which exists on old
- BSD 4.2-influenced systems? (It also existed under MS DOS Borland
- C, if memory serves me.) */
+ non-Windows systems without gettimeofday. */
#ifdef WINDOWS
# define TIMER_WINDOWS
#endif
#ifdef TIMER_WINDOWS
-typedef ULARGE_INTEGER wget_sys_time;
+typedef union {
+ DWORD lores; /* In case GetTickCount is used */
+ LARGE_INTEGER hires; /* In case high-resolution timer is used */
+} wget_sys_time;
#endif
struct wget_timer {
double elapsed_pre_start;
};
+#ifdef TIMER_WINDOWS
+
+/* Whether high-resolution timers are used. Set by wtimer_initialize_once
+ the first time wtimer_allocate is called. */
+static int using_hires_timers;
+
+/* Frequency of high-resolution timers -- number of updates per
+ millisecond. Calculated the first time wtimer_allocate is called
+ provided that high-resolution timers are available. */
+static double hires_millisec_freq;
+
+/* The first time a timer is created, determine whether to use
+ high-resolution timers. */
+
+static void
+wtimer_initialize_once (void)
+{
+ static int init_done;
+ if (!init_done)
+ {
+ LARGE_INTEGER freq;
+ init_done = 1;
+ freq.QuadPart = 0;
+ QueryPerformanceFrequency (&freq);
+ if (freq.QuadPart != 0)
+ {
+ using_hires_timers = 1;
+ hires_millisec_freq = (double) freq.QuadPart / 1000.0;
+ }
+ }
+}
+#endif /* TIMER_WINDOWS */
+
/* Allocate a timer. Calling wtimer_read on the timer will return
zero. It is not legal to call wtimer_update with a freshly
allocated timer -- use wtimer_reset first. */
{
struct wget_timer *wt = xnew (struct wget_timer);
xzero (*wt);
+
+#ifdef TIMER_WINDOWS
+ wtimer_initialize_once ();
+#endif
+
return wt;
}
#endif
#ifdef TIMER_WINDOWS
- /* We use GetSystemTime to get the elapsed time. MSDN warns that
- system clock adjustments can skew the output of GetSystemTime
- when used as a timer and gives preference to GetTickCount and
- high-resolution timers. But GetTickCount can overflow, and hires
- timers are typically used for profiling, not for regular time
- measurement. Since we handle clock skew anyway, we just use
- GetSystemTime. */
- FILETIME ft;
- SYSTEMTIME st;
- GetSystemTime (&st);
-
- /* As recommended by MSDN, we convert SYSTEMTIME to FILETIME, copy
- FILETIME to ULARGE_INTEGER, and use regular 64-bit integer
- arithmetic on that. */
- SystemTimeToFileTime (&st, &ft);
- wst->HighPart = ft.dwHighDateTime;
- wst->LowPart = ft.dwLowDateTime;
+ if (using_hires_timers)
+ {
+ QueryPerformanceCounter (&wst->hires);
+ }
+ else
+ {
+ /* Where hires counters are not available, use GetTickCount rather
+ GetSystemTime, because it is unaffected by clock skew and simpler
+ to use. Note that overflows don't affect us because we never use
+ absolute values of the ticker, only the differences. */
+ wst->lores = GetTickCount ();
+ }
#endif
}
/* Reset timer WT. This establishes the starting point from which
wtimer_elapsed() will return the number of elapsed milliseconds.
- It is allowed to reset a previously used timer.
-
- If a non-zero value is used as START, the timer's values will be
- offset by START. */
+ It is allowed to reset a previously used timer. */
void
wtimer_reset (struct wget_timer *wt)
#endif
#ifdef WINDOWS
- /* VC++ 6 doesn't support direct cast of uint64 to double. To work
- around this, we subtract, then convert to signed, then finally to
- double. */
- return (double)(signed __int64)(wst1->QuadPart - wst2->QuadPart) / 10000;
+ if (using_hires_timers)
+ return (wst1->hires.QuadPart - wst2->hires.QuadPart) / hires_millisec_freq;
+ else
+ return wst1->lores - wst2->lores;
#endif
}
#endif
#ifdef TIMER_WINDOWS
- /* According to MSDN, GetSystemTime returns a broken-down time
- structure the smallest member of which are milliseconds. */
- return 1;
+ if (using_hires_timers)
+ return 1.0 / hires_millisec_freq;
+ else
+ return 10; /* according to MSDN */
#endif
}
\f
int rnd3 = random_number (1000);
return rnd1 / 1000.0 + rnd2 / 1000000.0 + rnd3 / 1000000000.0;
}
-
-#if 0
-/* A debugging function for checking whether an MD5 library works. */
-
-#include "gen-md5.h"
-
-char *
-debug_test_md5 (char *buf)
-{
- unsigned char raw[16];
- static char res[33];
- unsigned char *p1;
- char *p2;
- int cnt;
- ALLOCA_MD5_CONTEXT (ctx);
-
- gen_md5_init (ctx);
- gen_md5_update ((unsigned char *)buf, strlen (buf), ctx);
- gen_md5_finish (ctx, raw);
-
- p1 = raw;
- p2 = res;
- cnt = 16;
- while (cnt--)
- {
- *p2++ = XNUM_TO_digit (*p1 >> 4);
- *p2++ = XNUM_TO_digit (*p1 & 0xf);
- ++p1;
- }
- *p2 = '\0';
-
- return res;
-}
-#endif
\f
/* Implementation of run_with_timeout, a generic timeout-forcing
routine for systems with Unix-like signal handling. */
#ifdef HAVE_NANOSLEEP
/* nanosleep is the preferred interface because it offers high
accuracy and, more importantly, because it allows us to reliably
- restart after having been interrupted by a signal such as
- SIGWINCH. */
+ restart receiving a signal such as SIGWINCH. (There was an
+ actual Debian bug report about --limit-rate malfunctioning while
+ the terminal was being resized.) */
struct timespec sleep, remaining;
sleep.tv_sec = (long) seconds;
sleep.tv_nsec = 1000000000L * (seconds - (long) seconds);
projects / wget / blobdiff