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Use monotonic clock to prevent timing issues

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This patch replaces the gettimeofday()/timeval-system with
uses of clock_gettime() with a monolithic clock and timespec-structs.
gettimeofday() is not accurate and prone to jumps and POSIX.1-2008
marks it as obsolete. Read more here [0].

The patch should speak for itself and decreases the binary
size for me by almost 200K(!).

[0]: http://blog.habets.pp.se/2010/09/gettimeofday-should-never-be-used-to-measure-time

Signed-off-by: Roberto E. Vargas Caballero <k0ga@shike2.com>
This commit is contained in:
FRIGN
2014-06-23 16:51:51 +02:00
committed by Roberto E. Vargas Caballero
parent 738f555f66
commit 5edeec1b20
1 changed files with 13 additions and 14 deletions
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27
st.c
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@@ -76,7 +76,7 @@ char *argv0;
#define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
#define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
#define IS_SET(flag) ((term.mode & (flag)) != 0)
#define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
#define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_nsec-t2.tv_nsec)/10E6)
#define CEIL(x) (((x) != (int) (x)) ? (x) + 1 : (x))
#define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
@@ -294,8 +294,8 @@ typedef struct {
char *clip;
Atom xtarget;
bool alt;
struct timeval tclick1;
struct timeval tclick2;
struct timespec tclick1;
struct timespec tclick2;
} Selection;
typedef union {
@@ -860,7 +860,7 @@ mousereport(XEvent *e) {
void
bpress(XEvent *e) {
struct timeval now;
struct timespec now;
Mousekey *mk;
if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
@@ -877,7 +877,7 @@ bpress(XEvent *e) {
}
if(e->xbutton.button == Button1) {
gettimeofday(&now, NULL);
clock_gettime(CLOCK_MONOTONIC, &now);
/* Clear previous selection, logically and visually. */
selclear(NULL);
@@ -3709,7 +3709,8 @@ run(void) {
int w = xw.w, h = xw.h;
fd_set rfd;
int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
long deltatime;
/* Waiting for window mapping */
while(1) {
@@ -3725,17 +3726,15 @@ run(void) {
ttynew();
cresize(w, h);
gettimeofday(&last, NULL);
clock_gettime(CLOCK_MONOTONIC, &last);
lastblink = last;
for(xev = actionfps;;) {
long deltatime;
FD_ZERO(&rfd);
FD_SET(cmdfd, &rfd);
FD_SET(xfd, &rfd);
if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
if(errno == EINTR)
continue;
die("select failed: %s\n", strerror(errno));
@@ -3752,9 +3751,9 @@ run(void) {
if(FD_ISSET(xfd, &rfd))
xev = actionfps;
gettimeofday(&now, NULL);
clock_gettime(CLOCK_MONOTONIC, &now);
drawtimeout.tv_sec = 0;
drawtimeout.tv_usec = (1000/xfps) * 1000;
drawtimeout.tv_nsec = (1000/xfps) * 10E6;
tv = &drawtimeout;
dodraw = 0;
@@ -3789,9 +3788,9 @@ run(void) {
if(blinkset) {
if(TIMEDIFF(now, lastblink) \
> blinktimeout) {
drawtimeout.tv_usec = 1;
drawtimeout.tv_nsec = 1000;
} else {
drawtimeout.tv_usec = (1000 * \
drawtimeout.tv_nsec = (10E6 * \
(blinktimeout - \
TIMEDIFF(now,
lastblink)));