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Cygwin: console: Make read() thread-safe.

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- Currently read() is somehow not thread-safe. This patch fixes
  the issue.
This commit is contained in:
Takashi Yano via Cygwin-patches 2021-01-28 23:11:32 +09:00 committed by Ken Brown
parent 4ddd4acf04
commit 5ef4fd5548
3 changed files with 18 additions and 5 deletions
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10
winsup/cygwin/fhandler.h
View File

@ -2090,6 +2090,8 @@ class fhandler_termios: public fhandler_base
tty_min *_tc;
tty *get_ttyp () {return (tty *) tc ();}
int eat_readahead (int n);
virtual void acquire_input_mutex_if_necessary (DWORD ms) {};
virtual void release_input_mutex_if_necessary (void) {};
public:
tty_min*& tc () {return _tc;}
@ -2401,6 +2403,14 @@ private:
void __release_input_mutex (const char *fn, int ln);
DWORD __acquire_output_mutex (const char *fn, int ln, DWORD ms);
void __release_output_mutex (const char *fn, int ln);
void acquire_input_mutex_if_necessary (DWORD ms)
{
acquire_input_mutex (ms);
}
void release_input_mutex_if_necessary (void)
{
release_input_mutex ();
}
char *&rabuf ();
size_t &ralen ();

11
winsup/cygwin/fhandler_console.cc
View File

@ -571,31 +571,34 @@ wait_retry:
#define buf ((char *) pv)
int ret;
acquire_attach_mutex (INFINITE);
acquire_input_mutex (INFINITE);
acquire_attach_mutex (INFINITE);
ret = process_input_message ();
release_input_mutex ();
release_attach_mutex ();
switch (ret)
{
case input_error:
release_input_mutex ();
goto err;
case input_processing:
release_input_mutex ();
continue;
case input_ok: /* input ready */
break;
case input_signalled: /* signalled */
release_input_mutex ();
goto sig_exit;
case input_winch:
release_input_mutex ();
continue;
default:
/* Should not come here */
release_input_mutex ();
goto err;
}
}
/* Check console read-ahead buffer filled from terminal requests */
acquire_input_mutex (INFINITE);
while (con.cons_rapoi && *con.cons_rapoi && buflen)
{
buf[copied_chars++] = *con.cons_rapoi++;
@ -984,9 +987,7 @@ fhandler_console::process_input_message (void)
if (toadd)
{
ssize_t ret;
release_input_mutex ();
line_edit_status res = line_edit (toadd, nread, *ti, &ret);
acquire_input_mutex (INFINITE);
if (res == line_edit_signalled)
{
stat = input_signalled;

2
winsup/cygwin/fhandler_termios.cc
View File

@ -332,7 +332,9 @@ fhandler_termios::line_edit (const char *rptr, size_t nread, termios& ti,
termios_printf ("got interrupt %d, sending signal %d", c, sig);
eat_readahead (-1);
release_input_mutex_if_necessary ();
tc ()->kill_pgrp (sig);
acquire_input_mutex_if_necessary (INFINITE);
ti.c_lflag &= ~FLUSHO;
sawsig = true;
goto restart_output;