perf ui: Improve handling sigwinch a bit

No need to unblock it at each ui__getch() and also allow other users to
check if a resize is needed, or force an refresh of terminal dimensions.

The 'force' one shouldn't be needed, but its in a slow path, so leave it
like that for now, I'll revisit this another day.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-aujchu6yx3bfy64non1rky0w@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent ca59bcbc
......@@ -4,6 +4,7 @@
#include "libslang.h"
#include <newt.h>
#include "ui.h"
#include "util.h"
#include <linux/compiler.h>
#include <linux/list.h>
#include <linux/rbtree.h>
......@@ -291,53 +292,10 @@ void ui_browser__update_nr_entries(struct ui_browser *browser, u32 nr_entries)
browser->seek(browser, browser->top_idx, SEEK_SET);
}
static int ui__getch(int delay_secs)
{
struct timeval timeout, *ptimeout = delay_secs ? &timeout : NULL;
fd_set read_set;
int err, key;
FD_ZERO(&read_set);
FD_SET(0, &read_set);
if (delay_secs) {
timeout.tv_sec = delay_secs;
timeout.tv_usec = 0;
}
err = select(1, &read_set, NULL, NULL, ptimeout);
if (err == 0)
return K_TIMER;
if (err == -1) {
if (errno == EINTR)
return K_RESIZE;
return K_ERROR;
}
key = SLang_getkey();
if (key != K_ESC)
return key;
FD_ZERO(&read_set);
FD_SET(0, &read_set);
timeout.tv_sec = 0;
timeout.tv_usec = 20;
err = select(1, &read_set, NULL, NULL, &timeout);
if (err == 0)
return K_ESC;
SLang_ungetkey(key);
return SLkp_getkey();
}
int ui_browser__run(struct ui_browser *self, int delay_secs)
{
int err, key;
pthread__unblock_sigwinch();
while (1) {
off_t offset;
......@@ -351,10 +309,7 @@ int ui_browser__run(struct ui_browser *self, int delay_secs)
key = ui__getch(delay_secs);
if (key == K_RESIZE) {
pthread_mutex_lock(&ui__lock);
SLtt_get_screen_size();
SLsmg_reinit_smg();
pthread_mutex_unlock(&ui__lock);
ui__refresh_dimensions(false);
ui_browser__refresh_dimensions(self);
__ui_browser__show_title(self, self->title);
ui_helpline__puts(self->helpline);
......
......@@ -14,6 +14,7 @@ void ui_progress__update(u64 curr, u64 total, const char *title)
if (use_browser <= 0)
return;
ui__refresh_dimensions(true);
pthread_mutex_lock(&ui__lock);
y = SLtt_Screen_Rows / 2 - 2;
SLsmg_set_color(0);
......
......@@ -7,10 +7,85 @@
#include "browser.h"
#include "helpline.h"
#include "ui.h"
#include "util.h"
#include "libslang.h"
#include "keysyms.h"
pthread_mutex_t ui__lock = PTHREAD_MUTEX_INITIALIZER;
static volatile int ui__need_resize;
void ui__refresh_dimensions(bool force)
{
if (force || ui__need_resize) {
ui__need_resize = 0;
pthread_mutex_lock(&ui__lock);
SLtt_get_screen_size();
SLsmg_reinit_smg();
pthread_mutex_unlock(&ui__lock);
}
}
static void ui__sigwinch(int sig __used)
{
ui__need_resize = 1;
}
static void ui__setup_sigwinch(void)
{
static bool done;
if (done)
return;
done = true;
pthread__unblock_sigwinch();
signal(SIGWINCH, ui__sigwinch);
}
int ui__getch(int delay_secs)
{
struct timeval timeout, *ptimeout = delay_secs ? &timeout : NULL;
fd_set read_set;
int err, key;
ui__setup_sigwinch();
FD_ZERO(&read_set);
FD_SET(0, &read_set);
if (delay_secs) {
timeout.tv_sec = delay_secs;
timeout.tv_usec = 0;
}
err = select(1, &read_set, NULL, NULL, ptimeout);
if (err == 0)
return K_TIMER;
if (err == -1) {
if (errno == EINTR)
return K_RESIZE;
return K_ERROR;
}
key = SLang_getkey();
if (key != K_ESC)
return key;
FD_ZERO(&read_set);
FD_SET(0, &read_set);
timeout.tv_sec = 0;
timeout.tv_usec = 20;
err = select(1, &read_set, NULL, NULL, &timeout);
if (err == 0)
return K_ESC;
SLang_ungetkey(key);
return SLkp_getkey();
}
static void newt_suspend(void *d __used)
{
newtSuspend();
......
......@@ -2,7 +2,10 @@
#define _PERF_UI_H_ 1
#include <pthread.h>
#include <stdbool.h>
extern pthread_mutex_t ui__lock;
void ui__refresh_dimensions(bool force);
#endif /* _PERF_UI_H_ */
......@@ -3,6 +3,7 @@
#include <stdbool.h>
int ui__getch(int delay_secs);
int ui__popup_menu(int argc, char * const argv[]);
int ui__help_window(const char *text);
bool ui__dialog_yesno(const char *msg);
......
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