Re: [PATCH v3 09/18] perf ui: Update use of pthread mutex

Ian Rogers
2022-08-26T16:03:14Z

On Fri, Aug 26, 2022 at 3:24 AM Adrian Hunter <adrian.hunter@intel.com> wrote:
>
> On 24/08/22 18:38, Ian Rogers wrote:
> > Switch to the use of mutex wrappers that provide better error checking.
> >
> > Signed-off-by: Ian Rogers <irogers@google.com>
> > ---
> > tools/perf/ui/browser.c | 20 ++++++++++----------
> > tools/perf/ui/browsers/annotate.c | 2 +-
> > tools/perf/ui/setup.c | 5 +++--
> > tools/perf/ui/tui/helpline.c | 5 ++---
> > tools/perf/ui/tui/progress.c | 8 ++++----
> > tools/perf/ui/tui/setup.c | 8 ++++----
> > tools/perf/ui/tui/util.c | 18 +++++++++---------
> > tools/perf/ui/ui.h | 4 ++--
> > 8 files changed, 35 insertions(+), 35 deletions(-)
> >
> > diff --git a/tools/perf/ui/browser.c b/tools/perf/ui/browser.c
> > index fa5bd5c20e96..78fb01d6ad63 100644
> > --- a/tools/perf/ui/browser.c
> > +++ b/tools/perf/ui/browser.c
> > @@ -268,9 +268,9 @@ void __ui_browser__show_title(struct ui_browser *browser, const char *title)
> >
> > void ui_browser__show_title(struct ui_browser *browser, const char *title)
> > {
> > - pthread_mutex_lock(&ui__lock);
> > + mutex_lock(&ui__lock);
> > __ui_browser__show_title(browser, title);
> > - pthread_mutex_unlock(&ui__lock);
> > + mutex_unlock(&ui__lock);
> > }
> >
> > int ui_browser__show(struct ui_browser *browser, const char *title,
> > @@ -284,7 +284,7 @@ int ui_browser__show(struct ui_browser *browser, const char *title,
> >
> > browser->refresh_dimensions(browser);
> >
> > - pthread_mutex_lock(&ui__lock);
> > + mutex_lock(&ui__lock);
> > __ui_browser__show_title(browser, title);
> >
> > browser->title = title;
> > @@ -295,16 +295,16 @@ int ui_browser__show(struct ui_browser *browser, const char *title,
> > va_end(ap);
> > if (err > 0)
> > ui_helpline__push(browser->helpline);
> > - pthread_mutex_unlock(&ui__lock);
> > + mutex_unlock(&ui__lock);
> > return err ? 0 : -1;
> > }
> >
> > void ui_browser__hide(struct ui_browser *browser)
> > {
> > - pthread_mutex_lock(&ui__lock);
> > + mutex_lock(&ui__lock);
> > ui_helpline__pop();
> > zfree(&browser->helpline);
> > - pthread_mutex_unlock(&ui__lock);
> > + mutex_unlock(&ui__lock);
> > }
> >
> > static void ui_browser__scrollbar_set(struct ui_browser *browser)
> > @@ -352,9 +352,9 @@ static int __ui_browser__refresh(struct ui_browser *browser)
> >
> > int ui_browser__refresh(struct ui_browser *browser)
> > {
> > - pthread_mutex_lock(&ui__lock);
> > + mutex_lock(&ui__lock);
> > __ui_browser__refresh(browser);
> > - pthread_mutex_unlock(&ui__lock);
> > + mutex_unlock(&ui__lock);
> >
> > return 0;
> > }
> > @@ -390,10 +390,10 @@ int ui_browser__run(struct ui_browser *browser, int delay_secs)
> > while (1) {
> > off_t offset;
> >
> > - pthread_mutex_lock(&ui__lock);
> > + mutex_lock(&ui__lock);
> > err = __ui_browser__refresh(browser);
> > SLsmg_refresh();
> > - pthread_mutex_unlock(&ui__lock);
> > + mutex_unlock(&ui__lock);
> > if (err < 0)
> > break;
> >
> > diff --git a/tools/perf/ui/browsers/annotate.c b/tools/perf/ui/browsers/annotate.c
> > index 44ba900828f6..b8747e8dd9ea 100644
> > --- a/tools/perf/ui/browsers/annotate.c
> > +++ b/tools/perf/ui/browsers/annotate.c
> > @@ -8,11 +8,11 @@
> > #include "../../util/hist.h"
> > #include "../../util/sort.h"
> > #include "../../util/map.h"
> > +#include "../../util/mutex.h"
> > #include "../../util/symbol.h"
> > #include "../../util/evsel.h"
> > #include "../../util/evlist.h"
> > #include <inttypes.h>
> > -#include <pthread.h>
> > #include <linux/kernel.h>
> > #include <linux/string.h>
> > #include <linux/zalloc.h>
> > diff --git a/tools/perf/ui/setup.c b/tools/perf/ui/setup.c
> > index 700335cde618..25ded88801a3 100644
> > --- a/tools/perf/ui/setup.c
> > +++ b/tools/perf/ui/setup.c
> > @@ -1,5 +1,4 @@
> > // SPDX-License-Identifier: GPL-2.0
> > -#include <pthread.h>
> > #include <dlfcn.h>
> > #include <unistd.h>
> >
> > @@ -8,7 +7,7 @@
> > #include "../util/hist.h"
> > #include "ui.h"
> >
> > -pthread_mutex_t ui__lock = PTHREAD_MUTEX_INITIALIZER;
> > +struct mutex ui__lock;
> > void *perf_gtk_handle;
> > int use_browser = -1;
> >
> > @@ -76,6 +75,7 @@ int stdio__config_color(const struct option *opt __maybe_unused,
> >
> > void setup_browser(bool fallback_to_pager)
> > {
> > + mutex_init(&ui__lock);
> > if (use_browser < 2 && (!isatty(1) || dump_trace))
> > use_browser = 0;
> >
> > @@ -118,4 +118,5 @@ void exit_browser(bool wait_for_ok)
> > default:
> > break;
> > }
> > + mutex_destroy(&ui__lock);
>
> Looks like exit_browser() can be called even when setup_browser()
> was never called.
>
> Note, it also looks like PTHREAD_MUTEX_INITIALIZER is all zeros so
> pthread won't notice.

Memory sanitizer will notice some cases of this and so I didn't want
to code defensively around exit being called ahead of setup.

Thanks,
Ian

> > }
> > diff --git a/tools/perf/ui/tui/helpline.c b/tools/perf/ui/tui/helpline.c
> > index 298d6af82fdd..db4952f5990b 100644
> > --- a/tools/perf/ui/tui/helpline.c
> > +++ b/tools/perf/ui/tui/helpline.c
> > @@ -2,7 +2,6 @@
> > #include <stdio.h>
> > #include <stdlib.h>
> > #include <string.h>
> > -#include <pthread.h>
> > #include <linux/kernel.h>
> > #include <linux/string.h>
> >
> > @@ -33,7 +32,7 @@ static int tui_helpline__show(const char *format, va_list ap)
> > int ret;
> > static int backlog;
> >
> > - pthread_mutex_lock(&ui__lock);
> > + mutex_lock(&ui__lock);
> > ret = vscnprintf(ui_helpline__last_msg + backlog,
> > sizeof(ui_helpline__last_msg) - backlog, format, ap);
> > backlog += ret;
> > @@ -45,7 +44,7 @@ static int tui_helpline__show(const char *format, va_list ap)
> > SLsmg_refresh();
> > backlog = 0;
> > }
> > - pthread_mutex_unlock(&ui__lock);
> > + mutex_unlock(&ui__lock);
> >
> > return ret;
> > }
> > diff --git a/tools/perf/ui/tui/progress.c b/tools/perf/ui/tui/progress.c
> > index 3d74af5a7ece..71b6c8d9474f 100644
> > --- a/tools/perf/ui/tui/progress.c
> > +++ b/tools/perf/ui/tui/progress.c
> > @@ -45,7 +45,7 @@ static void tui_progress__update(struct ui_progress *p)
> > }
> >
> > ui__refresh_dimensions(false);
> > - pthread_mutex_lock(&ui__lock);
> > + mutex_lock(&ui__lock);
> > y = SLtt_Screen_Rows / 2 - 2;
> > SLsmg_set_color(0);
> > SLsmg_draw_box(y, 0, 3, SLtt_Screen_Cols);
> > @@ -56,7 +56,7 @@ static void tui_progress__update(struct ui_progress *p)
> > bar = ((SLtt_Screen_Cols - 2) * p->curr) / p->total;
> > SLsmg_fill_region(y, 1, 1, bar, ' ');
> > SLsmg_refresh();
> > - pthread_mutex_unlock(&ui__lock);
> > + mutex_unlock(&ui__lock);
> > }
> >
> > static void tui_progress__finish(void)
> > @@ -67,12 +67,12 @@ static void tui_progress__finish(void)
> > return;
> >
> > ui__refresh_dimensions(false);
> > - pthread_mutex_lock(&ui__lock);
> > + mutex_lock(&ui__lock);
> > y = SLtt_Screen_Rows / 2 - 2;
> > SLsmg_set_color(0);
> > SLsmg_fill_region(y, 0, 3, SLtt_Screen_Cols, ' ');
> > SLsmg_refresh();
> > - pthread_mutex_unlock(&ui__lock);
> > + mutex_unlock(&ui__lock);
> > }
> >
> > static struct ui_progress_ops tui_progress__ops = {
> > diff --git a/tools/perf/ui/tui/setup.c b/tools/perf/ui/tui/setup.c
> > index b1be59b4e2a4..a3b8c397c24d 100644
> > --- a/tools/perf/ui/tui/setup.c
> > +++ b/tools/perf/ui/tui/setup.c
> > @@ -29,10 +29,10 @@ void ui__refresh_dimensions(bool force)
> > {
> > if (force || ui__need_resize) {
> > ui__need_resize = 0;
> > - pthread_mutex_lock(&ui__lock);
> > + mutex_lock(&ui__lock);
> > SLtt_get_screen_size();
> > SLsmg_reinit_smg();
> > - pthread_mutex_unlock(&ui__lock);
> > + mutex_unlock(&ui__lock);
> > }
> > }
> >
> > @@ -170,10 +170,10 @@ void ui__exit(bool wait_for_ok)
> > "Press any key...", 0);
> >
> > SLtt_set_cursor_visibility(1);
> > - if (!pthread_mutex_trylock(&ui__lock)) {
> > + if (mutex_trylock(&ui__lock)) {
> > SLsmg_refresh();
> > SLsmg_reset_smg();
> > - pthread_mutex_unlock(&ui__lock);
> > + mutex_unlock(&ui__lock);
> > }
> > SLang_reset_tty();
> > perf_error__unregister(&perf_tui_eops);
> > diff --git a/tools/perf/ui/tui/util.c b/tools/perf/ui/tui/util.c
> > index 0f562e2cb1e8..3c5174854ac8 100644
> > --- a/tools/perf/ui/tui/util.c
> > +++ b/tools/perf/ui/tui/util.c
> > @@ -95,7 +95,7 @@ int ui_browser__input_window(const char *title, const char *text, char *input,
> > t = sep + 1;
> > }
> >
> > - pthread_mutex_lock(&ui__lock);
> > + mutex_lock(&ui__lock);
> >
> > max_len += 2;
> > nr_lines += 8;
> > @@ -125,17 +125,17 @@ int ui_browser__input_window(const char *title, const char *text, char *input,
> > SLsmg_write_nstring((char *)exit_msg, max_len);
> > SLsmg_refresh();
> >
> > - pthread_mutex_unlock(&ui__lock);
> > + mutex_unlock(&ui__lock);
> >
> > x += 2;
> > len = 0;
> > key = ui__getch(delay_secs);
> > while (key != K_TIMER && key != K_ENTER && key != K_ESC) {
> > - pthread_mutex_lock(&ui__lock);
> > + mutex_lock(&ui__lock);
> >
> > if (key == K_BKSPC) {
> > if (len == 0) {
> > - pthread_mutex_unlock(&ui__lock);
> > + mutex_unlock(&ui__lock);
> > goto next_key;
> > }
> > SLsmg_gotorc(y, x + --len);
> > @@ -147,7 +147,7 @@ int ui_browser__input_window(const char *title, const char *text, char *input,
> > }
> > SLsmg_refresh();
> >
> > - pthread_mutex_unlock(&ui__lock);
> > + mutex_unlock(&ui__lock);
> >
> > /* XXX more graceful overflow handling needed */
> > if (len == sizeof(buf) - 1) {
> > @@ -215,19 +215,19 @@ void __ui__info_window(const char *title, const char *text, const char *exit_msg
> >
> > void ui__info_window(const char *title, const char *text)
> > {
> > - pthread_mutex_lock(&ui__lock);
> > + mutex_lock(&ui__lock);
> > __ui__info_window(title, text, NULL);
> > SLsmg_refresh();
> > - pthread_mutex_unlock(&ui__lock);
> > + mutex_unlock(&ui__lock);
> > }
> >
> > int ui__question_window(const char *title, const char *text,
> > const char *exit_msg, int delay_secs)
> > {
> > - pthread_mutex_lock(&ui__lock);
> > + mutex_lock(&ui__lock);
> > __ui__info_window(title, text, exit_msg);
> > SLsmg_refresh();
> > - pthread_mutex_unlock(&ui__lock);
> > + mutex_unlock(&ui__lock);
> > return ui__getch(delay_secs);
> > }
> >
> > diff --git a/tools/perf/ui/ui.h b/tools/perf/ui/ui.h
> > index 9b6fdf06e1d2..99f8d2fe9bc5 100644
> > --- a/tools/perf/ui/ui.h
> > +++ b/tools/perf/ui/ui.h
> > @@ -2,11 +2,11 @@
> > #ifndef _PERF_UI_H_
> > #define _PERF_UI_H_ 1
> >
> > -#include <pthread.h>
> > +#include "../util/mutex.h"
> > #include <stdbool.h>
> > #include <linux/compiler.h>
> >
> > -extern pthread_mutex_t ui__lock;
> > +extern struct mutex ui__lock;
> > extern void *perf_gtk_handle;
> >
> > extern int use_browser;
>