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Go Back   Linux Archive > ArchLinux > ArchLinux Pacman Development

 
 
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Old 01-01-2012, 02:07 AM
Dan McGee
 
Default Convert get_update_timediff to integer return value

We don't need absolute floating point precision at all here; we can
stick to integer land and use milliseconds which are precise enough for
our purposes. This also removes most floating point math out of the
non-update code path.

Signed-off-by: Dan McGee <dan@archlinux.org>
---
src/pacman/callback.c | 51 ++++++++++++++++++++++++++----------------------
src/pacman/util.h | 3 --
2 files changed, 28 insertions(+), 26 deletions(-)

diff --git a/src/pacman/callback.c b/src/pacman/callback.c
index 87ba30a..0dcdb69 100644
--- a/src/pacman/callback.c
+++ b/src/pacman/callback.c
@@ -43,15 +43,19 @@ static off_t list_total = 0.0;
static int on_progress = 0;
static alpm_list_t *output = NULL;

-/* Silly little helper function, determines if the caller needs a visual update
+/* update speed for the fill_progress based functions */
+#define UPDATE_SPEED_MS 200
+
+/**
+ * Silly little helper function, determines if the caller needs a visual update
* since the last time this function was called.
- * This is made for the two progress bar functions, to prevent flicker
- *
- * first_call indicates if this is the first time it is called, for
- * initialization purposes */
-static double get_update_timediff(int first_call)
+ * This is made for the two progress bar functions, to prevent flicker.
+ * @param first_call 1 on first call for initialization purposes, 0 otherwise
+ * @return number of milliseconds since last call
+ */
+static long get_update_timediff(int first_call)
{
- double retval = 0.0;
+ long retval = 0;
static struct timeval last_time = {0, 0};

/* on first call, simply set the last time and return */
@@ -59,18 +63,17 @@ static double get_update_timediff(int first_call)
gettimeofday(&last_time, NULL);
} else {
struct timeval this_time;
- double diff_sec, diff_usec;
+ time_t diff_sec;
+ suseconds_t diff_usec;

gettimeofday(&this_time, NULL);
diff_sec = this_time.tv_sec - last_time.tv_sec;
diff_usec = this_time.tv_usec - last_time.tv_usec;

- retval = diff_sec + (diff_usec / 1000000.0);
+ retval = (diff_sec * 1000) + (diff_usec / 1000);

- /* return 0 and do not update last_time if interval was too short */
- if(retval < UPDATE_SPEED_SEC) {
- retval = 0.0;
- } else {
+ /* do not update last_time if interval was too short */
+ if(retval >= UPDATE_SPEED_MS) {
last_time = this_time;
}
}
@@ -399,7 +402,7 @@ void cb_progress(alpm_progress_t event, const char *pkgname, int percent,
if(current != prevcurrent) {
/* update always */
} else if(!pkgname || percent == prevpercent ||
- get_update_timediff(0) < UPDATE_SPEED_SEC) {
+ get_update_timediff(0) < UPDATE_SPEED_MS) {
/* only update the progress bar when we have a package name, the
* percentage has changed, and it has been long enough. */
return;
@@ -534,7 +537,8 @@ void cb_dl_progress(const char *filename, off_t file_xfered, off_t file_total)

int totaldownload = 0;
off_t xfered, total;
- double rate = 0.0, timediff = 0.0;
+ double rate = 0.0;
+ long timediff = 0;
unsigned int eta_h = 0, eta_m = 0, eta_s = 0;
double rate_human, xfered_human;
const char *rate_label, *xfered_label;
@@ -593,16 +597,17 @@ void cb_dl_progress(const char *filename, off_t file_xfered, off_t file_total)
} else if(file_xfered == file_total) {
/* compute final values */
struct timeval current_time;
- double diff_sec, diff_usec;
+ time_t diff_sec;
+ suseconds_t diff_usec;

gettimeofday(&current_time, NULL);
diff_sec = current_time.tv_sec - initial_time.tv_sec;
diff_usec = current_time.tv_usec - initial_time.tv_usec;
- timediff = diff_sec + (diff_usec / 1000000.0);
- if(timediff > 0.0) {
- rate = xfered / timediff;
- /* round elapsed time to the nearest second */
- eta_s = (unsigned int)(timediff + 0.5);
+ timediff = (diff_sec * 1000) + (diff_usec / 1000);
+ if(timediff > 0) {
+ rate = (double)xfered / (timediff / 1000.0);
+ /* round elapsed time (in ms) to the nearest second */
+ eta_s = (unsigned int)(timediff + 500) / 1000;
} else {
eta_s = 0;
}
@@ -610,11 +615,11 @@ void cb_dl_progress(const char *filename, off_t file_xfered, off_t file_total)
/* compute current average values */
timediff = get_update_timediff(0);

- if(timediff < UPDATE_SPEED_SEC) {
+ if(timediff < UPDATE_SPEED_MS) {
/* return if the calling interval was too short */
return;
}
- rate = (xfered - xfered_last) / timediff;
+ rate = (double)(xfered - xfered_last) / (timediff / 1000.0);
/* average rate to reduce jumpiness */
rate = (rate + 2 * rate_last) / 3;
if(rate > 0.0) {
diff --git a/src/pacman/util.h b/src/pacman/util.h
index 6291939..5d3ea2f 100644
--- a/src/pacman/util.h
+++ b/src/pacman/util.h
@@ -36,9 +36,6 @@
#define _n(str1, str2, ct) (ct == 1 ? str1 : str2)
#endif

-/* update speed for the fill_progress based functions */
-#define UPDATE_SPEED_SEC 0.2f
-
typedef struct _pm_target_t {
alpm_pkg_t *remove;
alpm_pkg_t *install;
--
1.7.8.1
 

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