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Remove timeout in the main loop

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The main loop waits until there is some data to read in file descriptors of
the X server or the pseudo tty. But it uses a timeout in select(), which
causes that st awake each 20 ms, even it doesn't have something to do. This
patch removes this problem removing the timeout, which is not needed.
---
 TODO |    1 -
 st.c |   27 +++------------------------
 2 files changed, 3 insertions(+), 25 deletions(-)
This commit is contained in:
Roberto E. Vargas Caballero 2012-09-16 10:47:21 +02:00
parent 15cc8754c2
commit 85849ce72a
2 changed files with 3 additions and 25 deletions
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1
TODO
View file

@ -15,7 +15,6 @@ code & interface
* clean selection code
* clean and complete terminfo entry
* remove the timeouts in the main loop
bugs
----

27
st.c
View file

@ -53,8 +53,6 @@
#define XK_NO_MOD UINT_MAX
#define XK_ANY_MOD 0
#define SELECT_TIMEOUT (20*1000) /* 20 ms */
#define DRAW_TIMEOUT (20*1000) /* 20 ms */
#define REDRAW_TIMEOUT (80*1000) /* 80 ms */
#define SERRNO strerror(errno)
@ -205,7 +203,6 @@ typedef struct {
int ch; /* char height */
int cw; /* char width */
char state; /* focus, redraw, visible */
struct timeval lastdraw;
} XWindow;
typedef struct {
@ -250,7 +247,6 @@ static void drawregion(int, int, int, int);
static void execsh(void);
static void sigchld(int);
static void run(void);
static bool last_draw_too_old(void);
static void csidump(void);
static void csihandle(void);
@ -2158,7 +2154,6 @@ void
draw() {
drawregion(0, 0, term.col, term.row);
xcopy();
gettimeofday(&xw.lastdraw, NULL);
}
void
@ -2345,41 +2340,25 @@ resize(XEvent *e) {
ttyresize(col, row);
}
bool
last_draw_too_old(void) {
struct timeval now;
gettimeofday(&now, NULL);
return TIMEDIFF(now, xw.lastdraw) >= DRAW_TIMEOUT/1000;
}
void
run(void) {
XEvent ev;
fd_set rfd;
int xfd = XConnectionNumber(xw.dpy);
struct timeval timeout = {0};
bool stuff_to_print = 0;
for(;;) {
FD_ZERO(&rfd);
FD_SET(cmdfd, &rfd);
FD_SET(xfd, &rfd);
timeout.tv_sec = 0;
timeout.tv_usec = SELECT_TIMEOUT;
if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, &timeout) < 0) {
if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
if(errno == EINTR)
continue;
die("select failed: %s\n", SERRNO);
}
if(FD_ISSET(cmdfd, &rfd)) {
if(FD_ISSET(cmdfd, &rfd))
ttyread();
stuff_to_print = 1;
}
if(stuff_to_print && last_draw_too_old()) {
stuff_to_print = 0;
draw();
}
draw();
while(XPending(xw.dpy)) {
XNextEvent(xw.dpy, &ev);