### Eclipse Workspace Patch 1.0
#P org.eclipse.equinox.executable
Index: library/carbon/eclipseCarbon.c
===================================================================
RCS file: /cvsroot/rt/org.eclipse.equinox/framework/bundles/org.eclipse.equinox.executable/library/carbon/eclipseCarbon.c,v
retrieving revision 1.27
diff -u -r1.27 eclipseCarbon.c
--- library/carbon/eclipseCarbon.c	13 Nov 2009 20:20:21 -0000	1.27
+++ library/carbon/eclipseCarbon.c	30 Nov 2009 21:15:25 -0000
@@ -73,17 +73,81 @@
 }
 
 @end
+
+@interface AppleEventDelegate : NSObject
+- (void)handleOpenDocuments:(NSAppleEventDescriptor *)event withReplyEvent: (NSAppleEventDescriptor *)replyEvent;
+@end
+@implementation AppleEventDelegate
+	NSTimer *timer;
+	NSMutableArray *files;
+	
+- (void)handleOpenDocuments:(NSAppleEventDescriptor *)event withReplyEvent: (NSAppleEventDescriptor *)replyEvent {
+	NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
+    int count = [event numberOfItems];
+    int index = 1;
+    
+ 	if (!files) {
+		files = [NSMutableArray arrayWithCapacity:count];
+		[files retain];
+	}
+		
+	for (index = 1; index<=count; index++) {
+		NSAppleEventDescriptor *desc = [event descriptorAtIndex:index];
+		if (desc) {
+			desc = [desc coerceToDescriptorType:typeFSRef];
+			CFURLRef url = CFURLCreateFromFSRef(kCFAllocatorDefault, [[desc data] bytes]);
+			if (url) {
+				NSString *pathName = (NSString *)CFURLCopyFileSystemPath(url, kCFURLPOSIXPathStyle);
+				[files addObject:pathName];
+				[pathName release];
+				CFRelease(url);
+			}
+		}
+	}
+	
+	if (!timer) {
+		timer = [NSTimer scheduledTimerWithTimeInterval: 1.0
+												 target: self
+											   selector: @selector(handleTimer:)
+											   userInfo: nil
+												repeats: YES];
+	}
+	[pool release];
+}
+- (void) handleTimer: (NSTimer *) timer {
+	NSObject *delegate = [[NSApplication sharedApplication] delegate];
+	if (delegate != NULL && [delegate respondsToSelector: @selector(application:openFiles:)]) {
+		[delegate performSelector:@selector(application:openFiles:)	withObject:[NSApplication sharedApplication] withObject:files];
+		[files release];
+		[timer invalidate];
+	}
+}
+@end
 #endif
 
 static CFRunLoopRef loopRef = NULL;
 static void * startThread(void * init); 
 static void runEventLoop(CFRunLoopRef ref);
 static void dummyCallback(void * info) {}
+#ifndef COCOA
+static CFMutableArrayRef files;
+static EventHandlerRef appHandler;
+static int SWT_CLASS = 'SWT-';
+static int SWT_OPEN_FILE_KIND = 1;
+static int SWT_OPEN_FILE_PARAM = 'odoc';
+#endif
 
 int main() {
 	return -1;
 }
 
+void installAppleEventHandler();
+
+int reuseWorkbench(_TCHAR* filePath) {
+	installAppleEventHandler();
+	return 0;
+}
+
 #ifdef COCOA
 
 /* Show the Splash Window
@@ -149,6 +213,8 @@
 static CGImageSourceCreateWithURL_FUNC createWithURL = NULL;
 static CGImageSourceCreateImageAtIndex_FUNC createAtIndex = NULL;
 
+static pascal OSErr openDocumentsProc(const AppleEvent *theAppleEvent, AppleEvent *reply, long handlerRefcon);
+
 static OSStatus drawProc (EventHandlerCallRef eventHandlerCallRef, EventRef eventRef, void * data) {
 	int result = CallNextEventHandler(eventHandlerCallRef, eventRef);
 	if (image) {
@@ -183,6 +249,66 @@
 	}
 }
 
+static OSStatus appleEventProc(EventHandlerCallRef inCaller, EventRef theEvent, void* inRefcon) {
+	EventRecord eventRecord;
+	Boolean release = false;
+	EventQueueRef queue;
+	
+	queue = GetCurrentEventQueue();
+	if (IsEventInQueue (queue, theEvent)) {
+		RetainEvent (theEvent);
+		release = true;
+		RemoveEventFromQueue (queue, theEvent);
+	}
+	ConvertEventRefToEventRecord (theEvent, &eventRecord);
+	AEProcessAppleEvent (&eventRecord);
+	if (release) ReleaseEvent (theEvent);
+	return noErr;
+}
+
+static void timerProc(EventLoopTimerRef timer, void *userData) {
+	EventTargetRef target = GetApplicationEventTarget();
+	CFIndex count = CFArrayGetCount  (files);
+	int i;
+	for (i=0; i<count; i++) {
+		CFStringRef file = (CFStringRef) CFArrayGetValueAtIndex(files, i);
+		EventRef event = NULL;
+		CreateEvent (NULL, SWT_CLASS, SWT_OPEN_FILE_KIND, 0, kEventAttributeNone, &event);
+		SetEventParameter (event, SWT_OPEN_FILE_PARAM, typeCFStringRef, sizeof(file), &file);
+		OSStatus status = SendEventToEventTarget(event, target);
+		ReleaseEvent(event);
+		if (status == eventNotHandledErr) return;
+	}
+	CFRelease(files);
+	RemoveEventLoopTimer(timer);
+	RemoveEventHandler(appHandler);
+	AERemoveEventHandler(kCoreEventClass, kAEOpenDocuments, NewAEEventHandlerUPP(openDocumentsProc), false);
+}
+ 
+static pascal OSErr openDocumentsProc(const AppleEvent *theAppleEvent, AppleEvent *reply, long handlerRefcon) {
+    AEDescList  docList;
+    FSRef       theFSRef;
+    long        index;
+    long        count = 0;
+    
+    AEGetParamDesc(theAppleEvent, keyDirectObject, typeAEList, &docList);
+	AECountItems(&docList, &count);
+	for(index = 1; index <= count; index++) {
+        AEGetNthPtr(&docList, index, typeFSRef, NULL, NULL, &theFSRef, sizeof(FSRef), NULL);
+		CFURLRef url = CFURLCreateFromFSRef(kCFAllocatorDefault, &theFSRef);
+		CFStringRef pathName = CFURLCopyFileSystemPath(url, kCFURLPOSIXPathStyle);
+		if (!files) {
+			files = CFArrayCreateMutable(kCFAllocatorDefault, count, &kCFTypeArrayCallBacks);		
+            InstallEventLoopTimer(GetMainEventLoop(), 1, 1, NewEventLoopTimerUPP(timerProc), NULL, NULL); 
+		}
+		CFArrayAppendValue(files, pathName);
+		CFRelease(pathName);
+		CFRelease(url);
+    }
+    AEDisposeDesc(&docList);
+    return noErr;
+}
+
 /* Show the Splash Window
  *
  * Create the splash window, load the bitmap and display the splash window.
@@ -279,6 +405,25 @@
 }
 #endif	
 
+void installAppleEventHandler() {
+#ifdef COCOA
+	NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
+	AppleEventDelegate *appleEventDelegate = [[AppleEventDelegate alloc] init];
+	[NSApplication sharedApplication];
+	NSAppleEventManager *manager = [NSAppleEventManager sharedAppleEventManager];
+	[manager setEventHandler:appleEventDelegate 
+				 andSelector:@selector(handleOpenDocuments:withReplyEvent:) 
+			   forEventClass:kCoreEventClass 
+				  andEventID:kAEOpenDocuments];
+//	[appleEventDelegate release];
+	[pool release];
+#else	
+	EventTypeSpec kEvents[] = { {kEventClassAppleEvent, kEventAppleEvent} };
+	InstallApplicationEventHandler(NewEventHandlerUPP(appleEventProc), GetEventTypeCount(kEvents), kEvents, 0, &appHandler);
+	AEInstallEventHandler(kCoreEventClass, kAEOpenDocuments, NewAEEventHandlerUPP(openDocumentsProc), 0, false);
+#endif
+}
+
 jlong getSplashHandle() {
 	return (jlong)window;
 }
Index: library/eclipse.c
===================================================================
RCS file: /cvsroot/rt/org.eclipse.equinox/framework/bundles/org.eclipse.equinox.executable/library/eclipse.c,v
retrieving revision 1.68
diff -u -r1.68 eclipse.c
--- library/eclipse.c	13 Nov 2009 20:20:21 -0000	1.68
+++ library/eclipse.c	30 Nov 2009 21:15:25 -0000
@@ -226,6 +226,7 @@
 #define CP			 _T_ECLIPSE("-cp")
 #define CLASSPATH    _T_ECLIPSE("-classpath")
 #define JAR 		 _T_ECLIPSE("-jar")
+#define FILEPATH	  _T_ECLIPSE("-file")
 
 #define LIBRARY		  _T_ECLIPSE("--launcher.library")
 #define SUPRESSERRORS _T_ECLIPSE("--launcher.suppressErrors")
@@ -258,6 +259,7 @@
 static _TCHAR*  name          = NULL;			/* program name */	
 static _TCHAR*  library       = NULL;			/* the shared library */
 static _TCHAR*  permGen  	  = NULL;			/* perm gen size for sun */
+static _TCHAR*  filePath	  = NULL;			/* file to open */
 
 /* variables for ee options */
 static _TCHAR* eeExecutable = NULL;
@@ -300,6 +302,7 @@
     { VM,           &vmName,		0,			2 },
     { NAME,         &name,			0,			2 },
     { PERM_GEN,		&permGen,		0,			2 },
+    { FILEPATH,		&filePath,		0,			2 },
     { WS,			&wsArg,			0,			2 } };
 static int optionsSize = (sizeof(options) / sizeof(options[0]));
 
@@ -370,6 +373,8 @@
 	/* Initialize official program name */
    	officialName = name != NULL ? _tcsdup( name ) : getDefaultOfficialName();
     
+	if (reuseWorkbench(filePath)) return 0;
+
 #ifdef MACOSX
    	/* Most platforms, we will initialize the window system later before trying to do any
    	 * graphics.  On Mac, we need it initialized to get the dock icon properly, so always do 
Index: library/eclipseOS.h
===================================================================
RCS file: /cvsroot/rt/org.eclipse.equinox/framework/bundles/org.eclipse.equinox.executable/library/eclipseOS.h,v
retrieving revision 1.19
diff -u -r1.19 eclipseOS.h
--- library/eclipseOS.h	13 Nov 2009 20:20:17 -0000	1.19
+++ library/eclipseOS.h	30 Nov 2009 21:15:25 -0000
@@ -115,5 +115,7 @@
 /* an array of paths that will need to be on the search path to load the vm shared library */
 extern _TCHAR ** getVMLibrarySearchPath(_TCHAR * vmLibrary);
 
+extern int reuseWorkbench(_TCHAR* filePath);
+
 #endif /* ECLIPSE_OS_H */
 
Index: library/gtk/eclipseGtk.c
===================================================================
RCS file: /cvsroot/rt/org.eclipse.equinox/framework/bundles/org.eclipse.equinox.executable/library/gtk/eclipseGtk.c,v
retrieving revision 1.22
diff -u -r1.22 eclipseGtk.c
--- library/gtk/eclipseGtk.c	13 Nov 2009 20:20:21 -0000	1.22
+++ library/gtk/eclipseGtk.c	30 Nov 2009 21:15:26 -0000
@@ -32,6 +32,8 @@
 #include <stdlib.h>
 #include <string.h>
 #include <locale.h>
+#include <semaphore.h>
+#include <fcntl.h>
 
 /* Global Variables */
 char*  defaultVM     = "java";
@@ -47,10 +49,177 @@
 static GdkPixbuf*	pixbuf = 0;
 static GtkWidget*   image = 0;
 
+static sem_t* 		mutex;
+static Atom 		appAtom, launcherAtom;
+static char*		file = NULL;
+static int 			timerAttempts;
+
+static struct sigaction	quitAction;
+static struct sigaction	intAction;
+
 /* Local functions */
+static void catch_signal(int sig) {
+	//catch signals, free the lock, reinstall the original
+	//signal handlers and reraise the signal.
+	sem_post(mutex);
+	sem_close(mutex);
+	sigaction(SIGINT, &intAction, NULL);
+	sigaction(SIGQUIT, &intAction, NULL);
+	raise(sig);
+}
+
+typedef  int (*LockFunc) ();
+int executeWithLock (char *name, LockFunc func) {
+	int 	result;
+	struct 	sigaction	action;
+
+	mutex = sem_open(name, O_CREAT|O_EXCL, S_IRWXU | S_IRWXG | S_IRWXO, 1);
+	if (mutex == SEM_FAILED) {
+		//create failed. Probably lock is already created so try opening the
+		//existing lock.
+		mutex = sem_open(name, 0);
+	}
+	if (mutex == SEM_FAILED) return -1; //this is an error.
+
+	//install signal handler to free the lock if something bad
+	//happens. sem_t is not freed automatically when a process ends.
+	action.sa_handler = catch_signal;
+	sigaction(SIGINT, &action, &intAction);
+	sigaction(SIGQUIT, &action, &quitAction);
+	//sem_t has no timeouts on wait. :-(
+	sem_wait(mutex);
+
+	result = func();
+
+	sem_post(mutex);
+	sem_close(mutex);
+	//reinstall the original signal handlers
+	sigaction(SIGINT, &intAction, NULL);
+	sigaction(SIGQUIT, &quitAction, NULL);
+	return result;
+}
+
 static void log_handler(const gchar* domain, GLogLevelFlags flags, const gchar* msg, gpointer data) {
 	/* nothing */
 }
+
+static int setAppWindowProperty() {
+	Window appWindow;
+	GdkWindow *propWindow;
+	GdkAtom propAtom;
+	char *propVal;
+
+	//Look for the SWT window. If it's there, set a property on it.
+	appWindow = XGetSelectionOwner(GDK_DISPLAY(), appAtom);
+	if (appWindow) {
+		propWindow = gdk_window_foreign_new (appWindow);
+		propAtom = gdk_atom_intern("org.eclipse.swt.filePath.message", FALSE);
+		//append a colon delimiter in case more than one file gets
+		//appended to the app windows property.
+		if (file != NULL) {
+			propVal = malloc((_tcslen(file) + 2) * sizeof(char));
+			_stprintf(propVal, _T_ECLIPSE("%s%s"), file, ":");
+		} else {
+			propVal = malloc(2);
+			_stprintf(propVal, _T_ECLIPSE("%s"), ":");
+		}
+		gdk_property_change(propWindow, propAtom, propAtom, 8, GDK_PROP_MODE_APPEND, (guchar *)propVal, _tcslen(propVal));
+		free(propVal);
+		return 1;
+	}
+	return 0;
+}
+
+int setWindowProperty() {
+	char	*mutexPrefix = "SWT_Window_";
+	char 	*appName;
+	int 	result;
+
+	appName = malloc((_tcslen(mutexPrefix) + _tcslen(getOfficialName()) + 1) * sizeof(char));
+	_stprintf(appName, _T_ECLIPSE("%s%s"), mutexPrefix, getOfficialName());
+	result = executeWithLock(appName, setAppWindowProperty);
+	XSync (GDK_DISPLAY (), False);
+	free(appName);
+	return result;
+}
+
+static gboolean timerProc (gpointer data) {
+	//try to se the app window property. If unsuccessfull return
+	//true to reschedule the timer. Try 60 times (1 minute) max.
+	timerAttempts ++;
+	return !setWindowProperty() && timerAttempts < 60;
+}
+
+void findWindow() {
+	//try setWindowProperty every second until it succeeds
+	//or a minute has passed.
+	int count = 0;
+	while (count < 60 && !setWindowProperty()) {
+		count++;
+		sleep(1);
+	}
+}
+
+int createLauncherWindow() {
+	Window 		window, launcherWindow;
+	//check if a launcher window exists. If none exists, we know we are the
+	//first and we should be launching the app.
+	window = XGetSelectionOwner(GDK_DISPLAY(), launcherAtom);
+	if (window == 0) {
+		//create a launcher window that other processes can find.
+		launcherWindow = XCreateWindow(GDK_DISPLAY(), RootWindow(GDK_DISPLAY(), DefaultScreen(GDK_DISPLAY())), -10, -10, 1, 1, 0, 0,
+				InputOnly, CopyFromParent, (unsigned long) 0, (XSetWindowAttributes *)NULL);
+		//for some reason Set and Get are both necessary. Set alone does nothing.
+		XSetSelectionOwner(GDK_DISPLAY(), launcherAtom, launcherWindow, CurrentTime);
+		XGetSelectionOwner(GDK_DISPLAY(), launcherAtom);
+		//add a timeout to set the property on the apps window once the app is launched.
+		if (file != NULL) {
+			timerAttempts = 0;
+			g_timeout_add(1000, timerProc, 0);
+		}
+		return 0;
+	}
+	return 1;
+}
+
+int reuseWorkbench(char* filePath) {
+	char	*mutexPrefix = "SWT_Window_";
+	char	*mutexSuffix = "_Launcher";
+	char	*appName, *launcherName;
+	int 	result = 0;
+
+	if(initWindowSystem(&initialArgc, initialArgv, 1) != 0)
+		return -1;
+
+	file = filePath;
+
+	//App name is defined in SWT as well. Values must be consistent.
+	appName = malloc((_tcslen(mutexPrefix) + _tcslen(getOfficialName()) + 1) * sizeof(char));
+	_stprintf(appName, _T_ECLIPSE("%s%s"), mutexPrefix, getOfficialName());
+	appAtom = XInternAtom(GDK_DISPLAY(), appName, FALSE);
+	free(appName);
+	launcherName = malloc((_tcslen(mutexPrefix) + _tcslen(getOfficialName()) + _tcslen(mutexSuffix) + 1) * sizeof(char));
+	_stprintf(launcherName, _T_ECLIPSE("%s%s%s"), mutexPrefix, getOfficialName(), mutexSuffix);
+	launcherAtom = XInternAtom(GDK_DISPLAY(), launcherName, FALSE);
+
+	//check if app is already running. Just set property if it is.
+	if (setWindowProperty()) return 1;
+
+	result = executeWithLock(launcherName, createLauncherWindow);
+
+	free(launcherName);
+
+	if (result == 1) {
+		//The app is already being launched in another process.
+		//Wait for it to complete, set the property on its window,
+		//and exit this process.
+		if (file != NULL) findWindow();
+		result = 1;
+	}
+
+	return result;
+}
+
 /* Create and Display the Splash Window */
 int showSplash( const char* featureImage )
 {
Index: library/gtk/eclipseGtk.h
===================================================================
RCS file: /cvsroot/rt/org.eclipse.equinox/framework/bundles/org.eclipse.equinox.executable/library/gtk/eclipseGtk.h,v
retrieving revision 1.2
diff -u -r1.2 eclipseGtk.h
--- library/gtk/eclipseGtk.h	16 Apr 2009 17:58:02 -0000	1.2
+++ library/gtk/eclipseGtk.h	30 Nov 2009 21:15:26 -0000
@@ -13,6 +13,7 @@
 
 #include <gtk/gtk.h>
 #include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gdk/gdkx.h>
 
 struct GTK_PTRS { 
 	short not_initialized;
Index: library/win32/eclipseWin.c
===================================================================
RCS file: /cvsroot/rt/org.eclipse.equinox/framework/bundles/org.eclipse.equinox.executable/library/win32/eclipseWin.c,v
retrieving revision 1.26
diff -u -r1.26 eclipseWin.c
--- library/win32/eclipseWin.c	13 Nov 2009 20:20:15 -0000	1.26
+++ library/win32/eclipseWin.c	30 Nov 2009 21:15:26 -0000
@@ -14,6 +14,7 @@
 #include "eclipseUtil.h"
 #include "eclipseCommon.h"
 #include "eclipseJNI.h"
+#include "eclipseShm.h"
 
 #include <windows.h>
 #include <commctrl.h>
@@ -35,6 +36,13 @@
 _TCHAR*  vmLibrary 	   = _T("jvm.dll");
 _TCHAR*  shippedVMDir  = _T("jre\\bin\\");
 
+/* Define local variables for communicating with running eclipse instance. */
+static HANDLE	mutex;
+static UINT		findWindowTimeout = 1000;
+static UINT_PTR findWindowTimerId = 97;
+static UINT		timerCount = 0;
+static _TCHAR*	openFilePath;
+
 /* Define the window system arguments for the Java VM. */
 static _TCHAR*  argVM[] = { NULL };
 
@@ -44,6 +52,7 @@
 static UINT    jvmExitTimeout = 100;
 static UINT_PTR jvmExitTimerId = 99;
 
+static void CALLBACK findWindowProc(HWND hwnd, UINT message, UINT idTimer, DWORD dwTime);
 static void CALLBACK  detectJvmExit( HWND hwnd, UINT uMsg, UINT id, DWORD dwTime );
 static _TCHAR* checkVMRegistryKey(HKEY jrekey, _TCHAR* subKeyName);
 static void adjustSearchPath( _TCHAR * vmLibrary );
@@ -69,6 +78,83 @@
 #define COMPANY_NAME_KEY _T_ECLIPSE("\\StringFileInfo\\%04x%04x\\CompanyName")
 #define SUN_MICROSYSTEMS _T_ECLIPSE("Sun Microsystems")
 
+static void sendOpenFileMessage(HWND window) {
+	_TCHAR* id;
+	UINT msg;
+	int size = (_tcslen(openFilePath) + 1) * sizeof(_TCHAR);
+	DWORD wParam;
+#ifdef WIN64
+	DWORDLONG lParam;
+#else
+	DWORD lParam;
+#endif
+	createSharedData(&id, size);
+	setSharedData(id, openFilePath);
+	msg = RegisterWindowMessage(_T("SWT_FILEOPEN"));
+	_stscanf(id, _T_ECLIPSE("%lx_%lx"), &wParam, &lParam);
+	SendMessage(window, msg, wParam, lParam);
+	destroySharedData(id);
+}
+
+static int findSWTMessageWindow(int startTimer) {
+	HWND window;
+	_TCHAR *windowTitle, *windowPrefix, *name;
+	int result = 0;
+
+	windowPrefix = _T("SWT_Window_");
+	name = getOfficialName();
+	windowTitle = malloc((_tcslen(windowPrefix) + _tcslen(name) + 1) * sizeof(_TCHAR));
+	_stprintf(windowTitle, _T_ECLIPSE("%s%s"), windowPrefix, name);
+	window = FindWindow(NULL, windowTitle);
+	free(windowTitle);
+	if (window != NULL) {
+		sendOpenFileMessage(window);
+		ReleaseMutex(mutex);
+		CloseHandle(mutex);
+		result = 1;
+	} else {
+		if (startTimer) {
+			initWindowSystem(0, NULL, 0);
+			SetTimer( topWindow, findWindowTimerId, findWindowTimeout, findWindowProc );
+		}
+	}
+	return result;
+}
+
+static void CALLBACK findWindowProc(HWND hwnd, UINT message, UINT idTimer, DWORD dwTime) {
+	if (findSWTMessageWindow(0)) {
+		KillTimer(hwnd, findWindowTimerId);
+		return;
+	}
+	if (timerCount++ >= 60) {
+		KillTimer(hwnd, findWindowTimerId);
+		ReleaseMutex(mutex);
+		CloseHandle(mutex);
+	}
+}
+
+int reuseWorkbench(_TCHAR* filePath) {
+	_TCHAR*   mutexPrefix = _T("SWT_Mutex_");
+	_TCHAR*   mutexName, *name;
+	DWORD 		result=0, lock;
+
+	openFilePath = filePath;
+	name = getOfficialName();
+	mutexName = malloc((_tcslen(mutexPrefix) + _tcslen(name)  + 1) * sizeof(_TCHAR));
+	_stprintf(mutexName, _T_ECLIPSE("%s%s"), mutexPrefix, name);
+	mutex = CreateMutex(NULL, FALSE, mutexName);
+	free(mutexName);
+	if (mutex == NULL) return -1;
+	//wait for up to 1 minute
+	lock = WaitForSingleObject(mutex, 60*1000);
+	if (lock == WAIT_OBJECT_0) {
+		result = findSWTMessageWindow(1);
+	} else {
+		CloseHandle(mutex);
+	}
+	return result;
+}
+
 /* Show the Splash Window
  *
  * Open the bitmap, insert into the splash window and display it.