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On Windows, one can close a HANDLE which is currently being waited on. The MSDN
documentation says that the resulting behaviour is 'undefined', but it doesn't
crash. Currently, on POSIX, one couldn't use WaitableEventWatcher to watch an
event which gets deleted. This mismatch has bitten us several times now.
This patch allows WaitableEvents to be deleted while a WaitableEventWatcher is
still watching them. It applies only to watchers, the usual Wait() and
WaitMany() calls still require that all their target be valid until the end of
the call.
http://crbug.com/8809
Review URL: http://codereview.chromium.org/53026
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@12576 0039d316-1c4b-4281-b951-d872f2087c98
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This reverts commit r12459 - it broke the world.
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@12462 0039d316-1c4b-4281-b951-d872f2087c98
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On Windows, one can close a HANDLE which is currently being waited on. The MSDN
documentation says that the resulting behaviour is 'undefined', but it doesn't
crash. Currently, on POSIX, one couldn't use WaitableEventWatcher to watch an
event which gets deleted. This mismatch has bitten us several times now.
This patch allows WaitableEvents to be deleted while a WaitableEventWatcher is
still watching them. It applies only to watchers, the usual Wait() and
WaitMany() calls still require that all their target be valid until the end of
the call.
http://crbug.com/8809
Review URL: http://codereview.chromium.org/53026
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@12459 0039d316-1c4b-4281-b951-d872f2087c98
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(I blame Visual Studio)
Review URL: http://codereview.chromium.org/21131
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@9324 0039d316-1c4b-4281-b951-d872f2087c98
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a HANDLE from CreateEvent was used for signaling, both within a process and across processes.
WaitableEvent is the cross platform replacement for this. To convert:
* HANDLE -> base::WaitableEvent*
* ScopedHandle -> scoped_ptr<base::WaitableEvent>
* CreateEvent -> new base::WaitableEvent
* SetEvent -> base::WaitableEvent::Signal
* ResetEvent -> base::WaitableEvent::Reset
* ObjectWatcher -> base::WaitableEventWatcher
* WaitForMultipleObjects -> static base::WaitableEvent::WaitMany
ObjectWatcher remains for Windows specific code. WaitableEventWatcher has an identical interface save,
* It uses WaitableEvents, not HANDLEs
* It returns void from StartWatching and StopWatcher, rather than errors. System internal errors are fatal to the address space
IMPORTANT: There are semantic differences between the different platforms. WaitableEvents on Windows are implemented on top of events. Windows events work across process and this is used mostly for modal dialog support. Windows events can be duplicated with DuplicateHandle.
On other platforms, WaitableEvent works only within a single process. In the future we shall have to replace the current uses of cross-process events with IPCs.
BEWARE: HANDLE, on Windows, is a void *. Since any pointer type coerces to void *, you can pass a WaitableEvent * where a HANDLE is expected without any build-time errors.
Review URL: http://codereview.chromium.org/16554
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@8126 0039d316-1c4b-4281-b951-d872f2087c98
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