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patch 8.2.5118: MS-Windows: sending a message to another Vim may hang

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Problem:    MS-Windows: sending a message to another Vim may hang if that Vim
            is halted.
Solution:   Add a timeout to serverSendToVim(). (Ken Takata, closes #10585)
This commit is contained in:
K.Takata
2022-06-17 20:05:40 +01:00
committed by Bram Moolenaar
parent 7d149f899d
commit f9f2a330b9
3 changed files with 69 additions and 40 deletions
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55
src/os_mswin.c
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@@ -1971,6 +1971,10 @@ HWND message_window = 0; // window that's handling messages
# define VIM_CLASSNAME "VIM_MESSAGES"
# define VIM_CLASSNAME_LEN (sizeof(VIM_CLASSNAME) - 1)
// Timeout for sending a message to another Vim instance. Normally this works
// instantly, but it may hang when the other Vim instance is halted.
# define SENDMESSAGE_TIMEOUT (5 * 1000)
// Communication is via WM_COPYDATA messages. The message type is sent in
// the dwData parameter. Types are defined here.
# define COPYDATA_KEYS 0
@@ -1992,9 +1996,9 @@ static char_u *client_enc = NULL;
/*
* Tell the other side what encoding we are using.
* Errors are ignored.
* Return -1 if timeout happens. Other errors are ignored.
*/
static void
static int
serverSendEnc(HWND target)
{
COPYDATASTRUCT data;
@@ -2002,8 +2006,11 @@ serverSendEnc(HWND target)
data.dwData = COPYDATA_ENCODING;
data.cbData = (DWORD)STRLEN(p_enc) + 1;
data.lpData = p_enc;
(void)SendMessage(target, WM_COPYDATA, (WPARAM)message_window,
(LPARAM)(&data));
if (SendMessageTimeout(target, WM_COPYDATA,
(WPARAM)message_window, (LPARAM)&data,
SMTO_ABORTIFHUNG, SENDMESSAGE_TIMEOUT, NULL) == 0)
return -1;
return 0;
}
/*
@@ -2061,6 +2068,7 @@ Messaging_WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
COPYDATASTRUCT reply;
char_u *res;
int retval;
DWORD_PTR dwret = 0;
char_u *str;
char_u *tofree;
@@ -2114,9 +2122,17 @@ Messaging_WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
reply.lpData = res;
reply.cbData = (DWORD)STRLEN(res) + 1;
serverSendEnc(sender);
retval = (int)SendMessage(sender, WM_COPYDATA,
(WPARAM)message_window, (LPARAM)(&reply));
if (serverSendEnc(sender) < 0)
retval = -1;
else
{
if (SendMessageTimeout(sender, WM_COPYDATA,
(WPARAM)message_window, (LPARAM)&reply,
SMTO_ABORTIFHUNG, SENDMESSAGE_TIMEOUT, &dwret) == 0)
retval = -1;
else
retval = (int)dwret;
}
vim_free(tofree);
vim_free(res);
return retval;
@@ -2394,6 +2410,7 @@ serverSendReply(
HWND target;
COPYDATASTRUCT data;
long_u n = 0;
DWORD_PTR dwret = 0;
// The "name" argument is a magic cookie obtained from expand("<client>").
// It should be of the form 0xXXXXX - i.e. a C hex literal, which is the
@@ -2410,12 +2427,13 @@ serverSendReply(
data.cbData = (DWORD)STRLEN(reply) + 1;
data.lpData = reply;
serverSendEnc(target);
if (SendMessage(target, WM_COPYDATA, (WPARAM)message_window,
(LPARAM)(&data)))
return 0;
return -1;
if (serverSendEnc(target) < 0)
return -1;
if (SendMessageTimeout(target, WM_COPYDATA,
(WPARAM)message_window, (LPARAM)&data,
SMTO_ABORTIFHUNG, SENDMESSAGE_TIMEOUT, &dwret) == 0)
return -1;
return dwret ? 0 : -1;
}
int
@@ -2432,6 +2450,7 @@ serverSendToVim(
COPYDATASTRUCT data;
char_u *retval = NULL;
int retcode = 0;
DWORD_PTR dwret = 0;
char_u altname_buf[MAX_PATH];
// Execute locally if no display or target is ourselves
@@ -2463,9 +2482,13 @@ serverSendToVim(
data.cbData = (DWORD)STRLEN(cmd) + 1;
data.lpData = cmd;
serverSendEnc(target);
if (SendMessage(target, WM_COPYDATA, (WPARAM)message_window,
(LPARAM)(&data)) == 0)
if (serverSendEnc(target) < 0)
return -1;
if (SendMessageTimeout(target, WM_COPYDATA,
(WPARAM)message_window, (LPARAM)&data,
SMTO_ABORTIFHUNG, SENDMESSAGE_TIMEOUT, &dwret) == 0)
return -1;
if (dwret == 0)
return -1;
if (asExpr)