Aren/haiku
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Made the logic behind the locking in the outer and inner

Browse Source 
message loop more clear, both in the code and also via
comments. I get the occasional drop into the debugger
because MultiLocker says the Readlock has been acquired
twice. I don't see how it is possible from the code and
it could be another bug in the MultiLocker debugging
facilities, but the code should be clearer now anyway.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38477 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Stephan Aßmus 2010-08-31 11:19:23 +00:00
parent cb2fa7e665
commit 45db9a2073
1 changed files with 19 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
src/servers/app/ServerWindow.cpp
View File

@ -3379,8 +3379,7 @@ ServerWindow::_MessageLooper()
int32 messagesProcessed = 0;
bigtime_t processingStart = system_time();
bool lockedDesktop = false;
bool needsAllWindowsLocked = false;
bool lockedDesktopSingleWindow = false;
while (true) {
if (code == AS_DELETE_WINDOW || code == kMsgQuitLooper) {
@ -3393,7 +3392,7 @@ ServerWindow::_MessageLooper()
fLink.Flush();
}
if (lockedDesktop)
if (lockedDesktopSingleWindow)
fDesktop->UnlockSingleWindow();
quitLoop = true;
@ -3404,21 +3403,24 @@ ServerWindow::_MessageLooper()
break;
}
needsAllWindowsLocked = _MessageNeedsAllWindowsLocked(code);
if (!lockedDesktop && !needsAllWindowsLocked) {
// only lock it once
fDesktop->LockSingleWindow();
lockedDesktop = true;
} else if (lockedDesktop && !needsAllWindowsLocked) {
// nothing to do
} else if (needsAllWindowsLocked) {
if (lockedDesktop) {
// unlock single before locking all
// Acquire the appropriate lock
bool needsAllWindowsLocked = _MessageNeedsAllWindowsLocked(code);
if (needsAllWindowsLocked) {
// We may already still hold the read-lock from the previous
// inner-loop iteration.
if (lockedDesktopSingleWindow) {
fDesktop->UnlockSingleWindow();
lockedDesktop = false;
lockedDesktopSingleWindow = false;
}
fDesktop->LockAllWindows();
} else {
// We never keep the write-lock across inner-loop iterations,
// so there is nothing else to do besides read-locking unless
// we already have the read-lock from the previous iteration.
if (!lockedDesktopSingleWindow) {
fDesktop->LockSingleWindow();
lockedDesktopSingleWindow = true;
}
}
if (atomic_and(&fRedrawRequested, 0) != 0) {
@ -3465,7 +3467,7 @@ ServerWindow::_MessageLooper()
// Desktop locked), but don't hold the lock longer than 10 ms
if (!receiver.HasMessages() || ++messagesProcessed > 70
|| system_time() - processingStart > 10000) {
if (lockedDesktop)
if (lockedDesktopSingleWindow)
fDesktop->UnlockSingleWindow();
break;
}
@ -3475,7 +3477,7 @@ ServerWindow::_MessageLooper()
if (status != B_OK) {
// that shouldn't happen, it's our port
printf("Someone deleted our message port!\n");
if (lockedDesktop)
if (lockedDesktopSingleWindow)
fDesktop->UnlockSingleWindow();
// try to let our client die happily