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authorZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2016-04-19 21:30:14 -0400
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2016-04-20 08:58:53 -0400
commitae5b39588734aacef5b6b411cf2053fdcef4764a (patch)
tree27eeddf1f641a5f71690e4e4bcc99d43c2e504aa /src/basic/terminal-util.c
parent0c1792efe422622c3c8a11b70a722147304da4cb (diff)
basic/terminal-util: cache value for colors_enabled
After all it's something that we query over and over. For example, systemctl calls colors_enabled() four times for each failing service. The compiler is unable to optimize those calls away because they (potentially) accesses external and global state through on_tty() and getenv().
Diffstat (limited to 'src/basic/terminal-util.c')
-rw-r--r--src/basic/terminal-util.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/src/basic/terminal-util.c b/src/basic/terminal-util.c
index 0a9d2bbdef..9521b79daa 100644
--- a/src/basic/terminal-util.c
+++ b/src/basic/terminal-util.c
@@ -1135,14 +1135,19 @@ int open_terminal_in_namespace(pid_t pid, const char *name, int mode) {
}
bool colors_enabled(void) {
- const char *colors;
+ static int enabled = -1;
- colors = getenv("SYSTEMD_COLORS");
- if (!colors) {
- if (streq_ptr(getenv("TERM"), "dumb"))
- return false;
- return on_tty();
+ if (_unlikely_(enabled < 0)) {
+ const char *colors;
+
+ colors = getenv("SYSTEMD_COLORS");
+ if (colors)
+ enabled = parse_boolean(colors) != 0;
+ else if (streq_ptr(getenv("TERM"), "dumb"))
+ enabled = false;
+ else
+ enabled = on_tty();
}
- return parse_boolean(colors) != 0;
+ return enabled;
}