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commit 85849ce72aa4e9cee307a031b97777e9eba2d453
parent 15cc8754c2e272ebac6e86845859816e881da000
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Sun, 16 Sep 2012 10:47:21 +0200

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(-)
Diffstat:
MTODO | 1-
Mst.c | 27+++------------------------
2 files changed, 3 insertions(+), 25 deletions(-)

diff --git 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 @@ -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);