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From: Corinna Vinschen <corinna@sourceware.org> To: cygwin-cvs@sourceware.org Subject: [newlib-cygwin] Cygwin: pty: Make slave read() thread-safe. Date: Mon, 1 Feb 2021 10:01:23 +0000 (GMT) [thread overview] Message-ID: <20210201100123.0C81E385040E@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=f186f61d60b342c8167e652073bdc6e3f704a90a commit f186f61d60b342c8167e652073bdc6e3f704a90a Author: Takashi Yano via Cygwin-patches <cygwin-patches@cygwin.com> Date: Thu Jan 28 23:11:33 2021 +0900 Cygwin: pty: Make slave read() thread-safe. - Currently slave read() is somehow not thread-safe. This patch fixes the issue. Diff: --- winsup/cygwin/fhandler_tty.cc | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/winsup/cygwin/fhandler_tty.cc b/winsup/cygwin/fhandler_tty.cc index 06fc19ac2..48b89ae77 100644 --- a/winsup/cygwin/fhandler_tty.cc +++ b/winsup/cygwin/fhandler_tty.cc @@ -1241,6 +1241,7 @@ fhandler_pty_slave::read (void *ptr, size_t& len) time_to_wait = !vtime ? INFINITE : 100 * vtime; } +wait_retry: while (len) { switch (cygwait (input_available_event, time_to_wait)) @@ -1319,6 +1320,11 @@ fhandler_pty_slave::read (void *ptr, size_t& len) } goto out; } + if (!IsEventSignalled (input_available_event)) + { /* Maybe another thread has processed input. */ + ReleaseMutex (input_mutex); + goto wait_retry; + } if (!bytes_available (bytes_in_pipe)) {
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