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* flock.cc (lf_setlock): Add timeout variable and set before calling

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WFMO.  Drop debug output if process is not available.  Set timeout to
	0 instead.  Document timeout 0 in WFMO comment.
	(lf_getblock): Drop invalid F_POSIX lock type shortcut.  Only return
	overlap if event is not signalled.  Fix comment.
This commit is contained in:
Corinna Vinschen
2012-02-15 14:43:07 +00:00
parent 1423a93374
commit 5eb802f8ed
2 changed files with 23 additions and 13 deletions
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8
winsup/cygwin/ChangeLog
View File

@@ -1,3 +1,11 @@
2012-02-15 Corinna Vinschen <corinna@vinschen.de>
* flock.cc (lf_setlock): Add timeout variable and set before calling
WFMO. Drop debug output if process is not available. Set timeout to
0 instead. Document timeout 0 in WFMO comment.
(lf_getblock): Drop invalid F_POSIX lock type shortcut. Only return
overlap if event is not signalled. Fix comment.
2012-02-14 Christopher Faylor <me.cygwin2012@cgf.cx>
* pinfo.cc (_pinfo::set_ctty): Revert 2012-02-07 change to skip

28
winsup/cygwin/flock.cc
View File

@@ -1006,16 +1006,22 @@ lf_setlock (lockf_t *lock, inode_t *node, lockf_t **clean, HANDLE fhdl)
HANDLE w4[4] = { obj, NULL, NULL, NULL };
DWORD wait_count = 1;
DWORD timeout;
HANDLE proc = NULL;
if (lock->lf_flags & F_POSIX)
{
proc = OpenProcess (SYNCHRONIZE, FALSE, block->lf_wid);
if (!proc)
debug_printf ("Can't sync with process holding a POSIX lock "
"(Win32 pid %lu): %E", block->lf_wid);
timeout = 0L;
else
w4[wait_count++] = proc;
{
w4[wait_count++] = proc;
timeout = INFINITE;
}
}
else
timeout = 100L;
DWORD WAIT_SIGNAL_ARRIVED = WAIT_OBJECT_0 + wait_count;
w4[wait_count++] = signal_arrived;
@@ -1033,11 +1039,10 @@ lf_setlock (lockf_t *lock, inode_t *node, lockf_t **clean, HANDLE fhdl)
creator process. We have to make sure the event object is in a
signalled state, or that it has gone away. The latter we can only
recognize by retrying to fetch the block list, so we must not wait
infinitely. Same problem for POSIX locks if the process has already
exited at the time we're trying to open the process. */
infinitely. For POSIX locks, if the process has already exited,
just check if a signal or a thread cancel request arrived. */
SetThreadPriority (GetCurrentThread (), priority);
DWORD ret = WaitForMultipleObjects (wait_count, w4, FALSE,
proc ? INFINITE : 100L);
DWORD ret = WaitForMultipleObjects (wait_count, w4, FALSE, timeout);
SetThreadPriority (GetCurrentThread (), old_prio);
if (proc)
CloseHandle (proc);
@@ -1320,12 +1325,9 @@ lf_getblock (lockf_t *lock, inode_t *node)
/* Open the event object for synchronization. */
if (overlap->open_lock_obj ())
{
/* If we found a POSIX lock, it will block us. */
if (overlap->lf_flags & F_POSIX)
return overlap;
/* In case of BSD flock locks, check if the event object is
signalled. If so, the overlap doesn't actually exist anymore.
There are just a few open handles left. */
/* Check if the event object is signalled. If so, the overlap
doesn't actually exist anymore. There are just a few open
handles left. */
if (!IsEventSignalled (overlap->lf_obj))
return overlap;
overlap->close_lock_obj ();