Remove timeout in the main loop

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(-)

2 files changed, 3 insertions, 25 deletions

diff --git a/TODO b/TODO
index 1996137..c77c105 100644
--- a/TODO
+++ b/TODO
@@ -15,7 +15,6 @@ code & interface
 
 * clean selection code
 * clean and complete terminfo entry
-* remove the timeouts in the main loop
 
 bugs
 ----
diff --git a/st.c b/st.c
index f4ad23d..d7ca875 100644
--- a/st.c
+++ b/st.c
@@ -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);