I have since written and tested a 'peer' program in addition to the
client/server pair I previously described. I run serveral instances of this
peer program. Each peer is a server in the sense that it vends an object as
the root of an NSConnection and runs several threads to accept remote calls on
the connection. Each peer is also a client of all the other peers: it runs a
loop in which it tries to connect to any peer it is not yet connected to, and
to invoke methods on the proxies of those it is connected to. Thus, the peers
end up connected many-to-many. All peers invoke all the others, in random
order, and each can receive invocations from several others concurrently.
Also, when one peer calls another, the latter calls back to the first before it
returns from the method invocation originating from the first. (It calls a
different method of the peer protocol so this doesn't end up recursing.)
Testing these peers has uncovered new console log warnings and crash patterns that don't
seem related to over-releasing memory or using memory after it's released. Instead,
these seem related to managing "conversation" objects in a collection
(CFDictionary). These problems seem to occur specifically when some peers have been
running for some time and another starts up and tries to join the group; that is, the
crash occurs around the time the processes are establishing NSConnections to each other,
and before the new peer receives (m)any invocations from the other peers.
I've only tested these on OSX 10.5.5.
Here's code, and following that some representative output and crash dumps.
--------------------------------------------------------------------------------
// peer.mm
#import <Foundation/NSObject.h>
#import <Foundation/NSAutoreleasePool.h>
#import <Foundation/NSPort.h>
#import <Foundation/NSConnection.h>
#import <Foundation/NSPortNameServer.h>
#import <Foundation/NSRunLoop.h>
#import <Foundation/NSException.h>
#import <Foundation/NSString.h>
#import <Foundation/NSThread.h>
#import <Foundation/NSArray.h>
#import <unistd.h>
#import <stdlib.h>
#import <libkern/OSAtomic.h>
#import <vector>
#import "log.h"
using namespace std;
#define PEER_NAME_BASE "TestPeer"
// peer interface
@protocol IPeer <NSObject>
- (unsigned) call: (id<IPeer>) cb;
- (void) callBack;
@end
typedef id<IPeer> TPeer;
// peer class
@interface CPeer : NSObject <IPeer> {}
@end
static int32_t nCalls = 0;
static int32_t nCallsBack = 0;
@implementation CPeer
- (unsigned) call: (id<IPeer>) cb {
//log("call:\n");
OSAtomicIncrement32(&nCalls);
[cb callBack];
return 1;
}
- (void) callBack {
//log("callBack\n");
OSAtomicIncrement32(&nCallsBack);
}
@end
bool quit = false;
void onSignal(int s) {
log("onSignal\n");
quit = true;
}
int main (int argc, char * const argv[]) {
bool extraRelease = false;
if (argc < 3) {
log("not enough args\n");
return 1;
}
char* sPeerId = argv[1];
int peerId = atoi(sPeerId);
if (peerId < 1) {
log("invalid arg %s\n", argv[1]);
return 1;
}
char* sNumPeers = argv[2];
int numPeers = atoi(sNumPeers);
if (numPeers < 2) {
log("invalid arg %s\n", argv[2]);
return 1;
}
log("peer %d of %d...\n", peerId, numPeers);
if (argc > 3 && argv[3][0] == 'x') {
extraRelease = true;
}
signal(SIGTERM, onSignal);
signal(SIGINT, onSignal);
NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
CPeer* me = nil;
do {
// vend peer object...
NSPort* port = [[NSMachPort alloc] init];
if (port == nil) {
log("error: port is nil\n");
break;
}
[port autorelease];
NSConnection* connection
= [NSConnection connectionWithReceivePort:port sendPort:nil];
if (connection == nil) {
log("error: connection is nil\n");
break;
}
[connection enableMultipleThreads];
// create peer object to vend
me = [[CPeer alloc] init];
if (me == nil) {
log("error: peer to vend is nil\n");
}
[me autorelease];
// vend object
[connection setRootObject: me];
// publish name (@PEER_NAME_BASE + peerId)
NSString* localName = [NSString stringWithFormat: @"[EMAIL PROTECTED]",
@PEER_NAME_BASE,
peerId ];
NSMachBootstrapServer* namesrv = [NSMachBootstrapServer sharedInstance];
if ([namesrv registerPort: port name: localName] == NO) {
log("error: port not registered\n");
break;
}
// detach new threads to run runloops for the connection
for (unsigned n = 0; n < 4; n++) {
[connection runInNewThread];
}
vector<TPeer> peers(numPeers);
srandomdev();
// loop: call another peer...
NSAutoreleasePool* innerPool = nil;
while (!quit) {
// choose a peer at random
int nPeer = (int)(random() % numPeers) + 1;
if (nPeer == peerId) {
// that's me; try again
continue;
}
if (innerPool != nil) {
log("previous autorelease pool not released!\n");
}
innerPool = [[NSAutoreleasePool alloc] init];
@try {
TPeer peer = peers[nPeer - 1];
if (peer == nil) {
// not connected to that peer; try to connect now.
NSString* remoteName
= [NSString stringWithFormat: @"[EMAIL PROTECTED]",
@PEER_NAME_BASE,
nPeer ];
peer = (TPeer)[ NSConnection
rootProxyForConnectionWithRegisteredName: remoteName
host: nil ];
if (peer == nil) {
continue;
}
peers[nPeer - 1] = peer;
log( "got peer %p with retainCount %u\n",
peer,
[peer retainCount] ); // retainCount returns 3
[peer retain];
log("%d connected %s\n", peerId, [remoteName UTF8String]);
}
// call remote peer and let it call this one back
unsigned result = [peer call: me];
if (result == 0) {
[ NSException raise: @"UnexpectedResultException"
format: @"call to %d returned zero\n", nPeer ];
}
} @catch (NSException* x) {
log( "caught exception calling %d: %s\n",
nPeer,
[[x reason] UTF8String] );
// clean out failed peer proxy so we don't keep calling it,
// but in subsequent loops we'll resume trying to (re)connect
// to that peer.
TPeer peer = peers[nPeer - 1];
peers[nPeer - 1] = nil;
log( "on exception, releasing peer %p with retainCount %u\n",
peer,
[peer retainCount] ); // retainCount returns 1
if (extraRelease && [peer retainCount] > 1) {
[peer release];
}
[peer release];
} @finally {
[innerPool release];
innerPool = nil;
}
} // while (!quit)
log("%d quitting\n", peerId);
// release all the peers
vector<TPeer>::iterator iter, end = peers.end();
for (iter = peers.begin(); iter != end; iter++) {
TPeer peer = *iter;
if (peer == nil) {
continue;
}
log( "releasing peer %p with retainCount %u\n",
peer,
[peer retainCount] ); // retainCount returns 2
[peer release];
if (extraRelease) {
// if out-param proxies are considered owned by the caller,
// then this would be appropriate:
[peer release];
}
}
} while (false);
[pool release];
return 0;
}
--------------------------------------------------------------------------------
20081114 12:08:39 [14746] <0xa065dfa0> peer 4 of 4...
20081114 12:08:39 [14746] <0xa065dfa0> got peer 0x10b8f0 with retainCount 3
20081114 12:08:39 [14746] <0xa065dfa0> 4 connected TestPeer3
2008-11-14 12:08:39.216 peer[14746:807] Warning: attempting to remove bad
conversation from <NSThread: 0x1038a0>{name = (null), num = 1}, conversation
0x0, conversationCount 0
20081114 12:08:39 [14746] <0xa065dfa0> got peer 0x1122d0 with retainCount 3
20081114 12:08:39 [14746] <0xa065dfa0> 4 connected TestPeer2
2008-11-14 12:08:39.221 peer[14746:807] Warning: attempting to remove bad
conversation from <NSThread: 0x1038a0>{name = (null), num = 1}, conversation
0x0, conversationCount 0
20081114 12:08:39 [14746] <0xa065dfa0> got peer 0x10e070 with retainCount 3
20081114 12:08:39 [14746] <0xa065dfa0> 4 connected TestPeer1
--------------------------------------------------------------------------------
Process: peer [9765]
Path: ./peer
Identifier: peer
Version: ??? (???)
Code Type: X86 (Native)
Parent Process: tcsh [394]
Date/Time: 2008-11-13 19:59:58.596 -0800
OS Version: Mac OS X 10.5.5 (9F33)
Report Version: 6
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x00000000fffffffc
Crashed Thread: 2
Thread 2 Crashed:
0 com.apple.CoreFoundation 0x92658b41 CFDictionarySetValue + 1249
1 com.apple.Foundation 0x95335b19 addConversation + 249
2 com.apple.Foundation 0x952fbde7 -[NSConnection
_shouldDispatch:invocation:sequence:coder:] + 599
3 com.apple.Foundation 0x952f9f8e -[NSConnection
handleRequest:sequence:] + 942
4 com.apple.Foundation 0x952f994d -[NSConnection
handlePortCoder:] + 1149
5 com.apple.Foundation 0x952f947e -[NSConcretePortCoder
dispatch] + 142
6 com.apple.Foundation 0x952f8be3 __NSFireMachPort + 339
7 com.apple.CoreFoundation 0x92663635 __CFMachPortPerform + 117
8 com.apple.CoreFoundation 0x92687908 CFRunLoopRunSpecific + 3896
9 com.apple.CoreFoundation 0x92687cf8 CFRunLoopRunInMode + 88
10 com.apple.Foundation 0x953beae8 -[NSConnection run] + 280
11 com.apple.Foundation 0x952bebad -[NSThread main] + 45
12 com.apple.Foundation 0x952be754 __NSThread__main__ + 308
13 libSystem.B.dylib 0x9569b6f5 _pthread_start + 321
14 libSystem.B.dylib 0x9569b5b2 thread_start + 34
Thread 2 crashed with X86 Thread State (32-bit):
eax: 0x0010a910 ebx: 0x9265866b ecx: 0xa02851a0 edx: 0xfffffffc
edi: 0x001058d0 esi: 0x0010fc10 ebp: 0xb0102428 esp: 0xb01023d0
ss: 0x0000001f efl: 0x00010246 eip: 0x92658b41 cs: 0x00000017
ds: 0x0000001f es: 0x0000001f fs: 0x0000001f gs: 0x00000037
cr2: 0xfffffffc
Thread 0:
0 libSystem.B.dylib 0x9566a4ee semaphore_wait_signal_trap +
10
1 libSystem.B.dylib 0x95671fc5 pthread_mutex_lock + 569
2 libobjc.A.dylib 0x9410a1ac _class_getMethodNoSuper + 32
3 libobjc.A.dylib 0x9410029e
_class_lookupMethodAndLoadCache + 182
4 libobjc.A.dylib 0x941106d6 objc_msgSend + 102
5 com.apple.CoreFoundation 0x92706801 ___forwarding___ + 561
6 com.apple.CoreFoundation 0x92706a12 _CF_forwarding_prep_0 + 50
7 peer 0x00002c35 main + 1823 (peer.mm:182)
8 peer 0x00001cf7 _start + 209
9 peer 0x00001c25 start + 41
Thread 1:
0 libSystem.B.dylib 0x9566a4a6 mach_msg_trap + 10
1 libSystem.B.dylib 0x95671c9c mach_msg + 72
2 com.apple.CoreFoundation 0x926870ce CFRunLoopRunSpecific + 1790
3 com.apple.CoreFoundation 0x92687cf8 CFRunLoopRunInMode + 88
4 com.apple.Foundation 0x953beae8 -[NSConnection run] + 280
5 com.apple.Foundation 0x952bebad -[NSThread main] + 45
6 com.apple.Foundation 0x952be754 __NSThread__main__ + 308
7 libSystem.B.dylib 0x9569b6f5 _pthread_start + 321
8 libSystem.B.dylib 0x9569b5b2 thread_start + 34
Thread 3:
0 libSystem.B.dylib 0x9566a4be semaphore_signal_trap + 10
1 libSystem.B.dylib 0x9567226d pthread_mutex_unlock + 472
2 libobjc.A.dylib 0x9410a271 _class_getMethodNoSuper + 229
3 libobjc.A.dylib 0x9410029e
_class_lookupMethodAndLoadCache + 182
4 libobjc.A.dylib 0x941106d6 objc_msgSend + 102
5 com.apple.CoreFoundation 0x92706468 -[NSInvocation invoke] + 136
6 com.apple.Foundation 0x952fc154 -[NSConnection
dispatchInvocation:] + 132
7 com.apple.Foundation 0x952fa107 -[NSConnection
handleRequest:sequence:] + 1319
8 com.apple.Foundation 0x952f994d -[NSConnection
handlePortCoder:] + 1149
9 com.apple.Foundation 0x952f947e -[NSConcretePortCoder
dispatch] + 142
10 com.apple.Foundation 0x952f8be3 __NSFireMachPort + 339
11 com.apple.CoreFoundation 0x92663635 __CFMachPortPerform + 117
12 com.apple.CoreFoundation 0x92687908 CFRunLoopRunSpecific + 3896
13 com.apple.CoreFoundation 0x92687cf8 CFRunLoopRunInMode + 88
14 com.apple.Foundation 0x953beae8 -[NSConnection run] + 280
15 com.apple.Foundation 0x952bebad -[NSThread main] + 45
16 com.apple.Foundation 0x952be754 __NSThread__main__ + 308
17 libSystem.B.dylib 0x9569b6f5 _pthread_start + 321
18 libSystem.B.dylib 0x9569b5b2 thread_start + 34
Thread 4:
0 libSystem.B.dylib 0x9566a4ee semaphore_wait_signal_trap +
10
1 libSystem.B.dylib 0x95671fc5 pthread_mutex_lock + 569
2 libobjc.A.dylib 0x9410a1ac _class_getMethodNoSuper + 32
3 libobjc.A.dylib 0x9410029e
_class_lookupMethodAndLoadCache + 182
4 libobjc.A.dylib 0x941106d6 objc_msgSend + 102
5 com.apple.CoreFoundation 0x92705c28 -[NSInvocation selector] + 56
6 com.apple.Foundation 0x952fc0f6 -[NSConnection
dispatchInvocation:] + 38
7 com.apple.Foundation 0x952fa107 -[NSConnection
handleRequest:sequence:] + 1319
8 com.apple.Foundation 0x952f994d -[NSConnection
handlePortCoder:] + 1149
9 com.apple.Foundation 0x952f947e -[NSConcretePortCoder
dispatch] + 142
10 com.apple.Foundation 0x952f8be3 __NSFireMachPort + 339
11 com.apple.CoreFoundation 0x92663635 __CFMachPortPerform + 117
12 com.apple.CoreFoundation 0x92687908 CFRunLoopRunSpecific + 3896
13 com.apple.CoreFoundation 0x92687cf8 CFRunLoopRunInMode + 88
14 com.apple.Foundation 0x953beae8 -[NSConnection run] + 280
15 com.apple.Foundation 0x952bebad -[NSThread main] + 45
16 com.apple.Foundation 0x952be754 __NSThread__main__ + 308
17 libSystem.B.dylib 0x9569b6f5 _pthread_start + 321
18 libSystem.B.dylib 0x9569b5b2 thread_start + 34
--------------------------------------------------------------------------------
Process: peer [7043]
Path: ./peer
Identifier: peer
Version: ??? (???)
Code Type: X86 (Native)
Parent Process: tcsh [247]
Date/Time: 2008-11-13 15:50:45.268 -0800
OS Version: Mac OS X 10.5.5 (9F33)
Report Version: 6
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000005
Crashed Thread: 3
Thread 3 Crashed:
0 com.apple.CoreFoundation 0x9268a036 CFEqual + 38
1 com.apple.CoreFoundation 0x926599d5 __CFDictionaryFindBuckets1b
+ 293
2 com.apple.CoreFoundation 0x9265a1fd CFDictionaryGetValue + 141
3 com.apple.Foundation 0x952e33cf lastConversationInfo + 47
4 com.apple.Foundation 0x95335a57 addConversation + 55
5 com.apple.Foundation 0x952fbde7 -[NSConnection
_shouldDispatch:invocation:sequence:coder:] + 599
6 com.apple.Foundation 0x952f9f8e -[NSConnection
handleRequest:sequence:] + 942
7 com.apple.Foundation 0x952f994d -[NSConnection
handlePortCoder:] + 1149
8 com.apple.Foundation 0x952f947e -[NSConcretePortCoder
dispatch] + 142
9 com.apple.Foundation 0x952f8be3 __NSFireMachPort + 339
10 com.apple.CoreFoundation 0x92663635 __CFMachPortPerform + 117
11 com.apple.CoreFoundation 0x92687908 CFRunLoopRunSpecific + 3896
12 com.apple.CoreFoundation 0x92687cf8 CFRunLoopRunInMode + 88
13 com.apple.Foundation 0x953beae8 -[NSConnection run] + 280
14 com.apple.Foundation 0x952bebad -[NSThread main] + 45
15 com.apple.Foundation 0x952be754 __NSThread__main__ + 308
16 libSystem.B.dylib 0x9569b6f5 _pthread_start + 321
17 libSystem.B.dylib 0x9569b5b2 thread_start + 34
Thread 3 crashed with X86 Thread State (32-bit):
eax: 0x00000001 ebx: 0x9268a029 ecx: 0x9268a010 edx: 0x00000000
edi: 0x00000000 esi: 0x00000003 ebp: 0xb0184388 esp: 0xb0184360
ss: 0x0000001f efl: 0x00010283 eip: 0x9268a036 cs: 0x00000017
ds: 0x0000001f es: 0x0000001f fs: 0x0000001f gs: 0x00000037
cr2: 0x00000005
Thread 0:
0 libSystem.B.dylib 0x9566a4be semaphore_signal_trap + 10
1 libSystem.B.dylib 0x9567226d pthread_mutex_unlock + 472
2 libobjc.A.dylib 0x941015a7 _cache_fill + 544
3 libobjc.A.dylib 0x940ff8e0 log_and_fill_cache + 141
4 libobjc.A.dylib 0x941002b6
_class_lookupMethodAndLoadCache + 206
5 libobjc.A.dylib 0x941106d6 objc_msgSend + 102
6 peer 0x00001c43 _start + 209
7 peer 0x00001b71 start + 41
Thread 1:
0 libSystem.B.dylib 0x9566a4a6 mach_msg_trap + 10
1 libSystem.B.dylib 0x95671c9c mach_msg + 72
2 com.apple.CoreFoundation 0x926870ce CFRunLoopRunSpecific + 1790
3 com.apple.CoreFoundation 0x92687cf8 CFRunLoopRunInMode + 88
4 com.apple.Foundation 0x953beae8 -[NSConnection run] + 280
5 com.apple.Foundation 0x952bebad -[NSThread main] + 45
6 com.apple.Foundation 0x952be754 __NSThread__main__ + 308
7 libSystem.B.dylib 0x9569b6f5 _pthread_start + 321
8 libSystem.B.dylib 0x9569b5b2 thread_start + 34
Thread 2:
0 libSystem.B.dylib 0x9566a4a6 mach_msg_trap + 10
1 libSystem.B.dylib 0x95671c9c mach_msg + 72
2 com.apple.CoreFoundation 0x926870ce CFRunLoopRunSpecific + 1790
3 com.apple.CoreFoundation 0x92687cf8 CFRunLoopRunInMode + 88
4 com.apple.Foundation 0x953beae8 -[NSConnection run] + 280
5 com.apple.Foundation 0x952bebad -[NSThread main] + 45
6 com.apple.Foundation 0x952be754 __NSThread__main__ + 308
7 libSystem.B.dylib 0x9569b6f5 _pthread_start + 321
8 libSystem.B.dylib 0x9569b5b2 thread_start + 34
Thread 4:
0 libSystem.B.dylib 0x9566a4ee semaphore_wait_signal_trap +
10
1 libSystem.B.dylib 0x95671fc5 pthread_mutex_lock + 569
2 libobjc.A.dylib 0x941013c8 _cache_fill + 65
3 libobjc.A.dylib 0x940ff8e0 log_and_fill_cache + 141
4 libobjc.A.dylib 0x941002b6
_class_lookupMethodAndLoadCache + 206
5 libobjc.A.dylib 0x941106d6 objc_msgSend + 102
6 com.apple.Foundation 0x952fa107 -[NSConnection
handleRequest:sequence:] + 1319
7 com.apple.Foundation 0x952f994d -[NSConnection
handlePortCoder:] + 1149
8 com.apple.Foundation 0x952f947e -[NSConcretePortCoder
dispatch] + 142
9 com.apple.Foundation 0x952f8be3 __NSFireMachPort + 339
10 com.apple.CoreFoundation 0x92663635 __CFMachPortPerform + 117
11 com.apple.CoreFoundation 0x92687908 CFRunLoopRunSpecific + 3896
12 com.apple.CoreFoundation 0x92687cf8 CFRunLoopRunInMode + 88
13 com.apple.Foundation 0x953beae8 -[NSConnection run] + 280
14 com.apple.Foundation 0x952bebad -[NSThread main] + 45
15 com.apple.Foundation 0x952be754 __NSThread__main__ + 308
16 libSystem.B.dylib 0x9569b6f5 _pthread_start + 321
17 libSystem.B.dylib 0x9569b5b2 thread_start + 34
--------------------------------------------------------------------------------
Process: peer [6078]
Path: ./peer
Identifier: peer
Version: ??? (???)
Code Type: X86 (Native)
Parent Process: tcsh [247]
Date/Time: 2008-11-13 12:05:28.364 -0800
OS Version: Mac OS X 10.5.5 (9F33)
Report Version: 6
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000005
Crashed Thread: 4
Thread 4 Crashed:
0 com.apple.CoreFoundation 0x9268a036 CFEqual + 38
1 com.apple.CoreFoundation 0x926599d5 __CFDictionaryFindBuckets1b
+ 293
2 com.apple.CoreFoundation 0x9265a1fd CFDictionaryGetValue + 141
3 com.apple.Foundation 0x952e33cf lastConversationInfo + 47
4 com.apple.Foundation 0x952fbbfe -[NSConnection
_shouldDispatch:invocation:sequence:coder:] + 110
5 com.apple.Foundation 0x952f9f8e -[NSConnection
handleRequest:sequence:] + 942
6 com.apple.Foundation 0x952f994d -[NSConnection
handlePortCoder:] + 1149
7 com.apple.Foundation 0x952f947e -[NSConcretePortCoder
dispatch] + 142
8 com.apple.Foundation 0x952f8be3 __NSFireMachPort + 339
9 com.apple.CoreFoundation 0x92663635 __CFMachPortPerform + 117
10 com.apple.CoreFoundation 0x92687908 CFRunLoopRunSpecific + 3896
11 com.apple.CoreFoundation 0x92687cf8 CFRunLoopRunInMode + 88
12 com.apple.Foundation 0x953beae8 -[NSConnection run] + 280
13 com.apple.Foundation 0x952bebad -[NSThread main] + 45
14 com.apple.Foundation 0x952be754 __NSThread__main__ + 308
15 libSystem.B.dylib 0x9569b6f5 _pthread_start + 321
16 libSystem.B.dylib 0x9569b5b2 thread_start + 34
Thread 4 crashed with X86 Thread State (32-bit):
eax: 0x00000001 ebx: 0x9268a029 ecx: 0x9268a010 edx: 0x00000000
edi: 0x00000000 esi: 0x00000007 ebp: 0xb02063c8 esp: 0xb02063a0
ss: 0x0000001f efl: 0x00010287 eip: 0x9268a036 cs: 0x00000017
ds: 0x0000001f es: 0x0000001f fs: 0x0000001f gs: 0x00000037
cr2: 0x00000005
Thread 0:
0 libSystem.B.dylib 0x9566a4a6 mach_msg_trap + 10
1 libSystem.B.dylib 0x95671c9c mach_msg + 72
2 com.apple.CoreFoundation 0x926870ce CFRunLoopRunSpecific + 1790
3 com.apple.CoreFoundation 0x92687cf8 CFRunLoopRunInMode + 88
4 com.apple.Foundation 0x952f5a0d -[NSConnection
sendInvocation:internal:] + 3005
5 com.apple.Foundation 0x952f4b89 -[NSDistantObject
forwardInvocation:] + 329
6 com.apple.CoreFoundation 0x927069aa ___forwarding___ + 986
7 com.apple.CoreFoundation 0x92706a12 _CF_forwarding_prep_0 + 50
8 peer 0x00002b73 main + 1813 (peer.mm:198)
9 peer 0x00001c43 _start + 209
10 peer 0x00001b71 start + 41
Thread 1:
0 libSystem.B.dylib 0x9566a4a6 mach_msg_trap + 10
1 libSystem.B.dylib 0x95671c9c mach_msg + 72
2 com.apple.CoreFoundation 0x926870ce CFRunLoopRunSpecific + 1790
3 com.apple.CoreFoundation 0x92687cf8 CFRunLoopRunInMode + 88
4 com.apple.Foundation 0x953beae8 -[NSConnection run] + 280
5 com.apple.Foundation 0x952bebad -[NSThread main] + 45
6 com.apple.Foundation 0x952be754 __NSThread__main__ + 308
7 libSystem.B.dylib 0x9569b6f5 _pthread_start + 321
8 libSystem.B.dylib 0x9569b5b2 thread_start + 34
Thread 2:
0 com.apple.CoreFoundation 0x9270790c +[NSObject
instanceMethodSignatureForSelector:] + 44
1 com.apple.Foundation 0x952f4413 -[NSDistantObject
methodSignatureForSelector:] + 563
2 com.apple.CoreFoundation 0x927066bd ___forwarding___ + 237
3 com.apple.CoreFoundation 0x92706a12 _CF_forwarding_prep_0 + 50
4 peer 0x00002423 -[CPeer call:] + 69
(peer.mm:60)
5 com.apple.CoreFoundation 0x92706a7d __invoking___ + 29
6 com.apple.CoreFoundation 0x92706468 -[NSInvocation invoke] + 136
7 com.apple.CoreFoundation 0x92706538 -[NSInvocation
invokeWithTarget:] + 72
8 com.apple.CoreFoundation 0x927069aa ___forwarding___ + 986
9 com.apple.CoreFoundation 0x92706a12 _CF_forwarding_prep_0 + 50
10 com.apple.CoreFoundation 0x92706a7d __invoking___ + 29
11 com.apple.CoreFoundation 0x92706468 -[NSInvocation invoke] + 136
12 com.apple.Foundation 0x952fc154 -[NSConnection
dispatchInvocation:] + 132
13 com.apple.Foundation 0x952fa107 -[NSConnection
handleRequest:sequence:] + 1319
14 com.apple.Foundation 0x952f994d -[NSConnection
handlePortCoder:] + 1149
15 com.apple.Foundation 0x952f947e -[NSConcretePortCoder
dispatch] + 142
16 com.apple.Foundation 0x952f8be3 __NSFireMachPort + 339
17 com.apple.CoreFoundation 0x92663635 __CFMachPortPerform + 117
18 com.apple.CoreFoundation 0x92687908 CFRunLoopRunSpecific + 3896
19 com.apple.CoreFoundation 0x92687cf8 CFRunLoopRunInMode + 88
20 com.apple.Foundation 0x953beae8 -[NSConnection run] + 280
21 com.apple.Foundation 0x952bebad -[NSThread main] + 45
22 com.apple.Foundation 0x952be754 __NSThread__main__ + 308
23 libSystem.B.dylib 0x9569b6f5 _pthread_start + 321
24 libSystem.B.dylib 0x9569b5b2 thread_start + 34
Thread 3:
0 libSystem.B.dylib 0x9566a4a6 mach_msg_trap + 10
1 libSystem.B.dylib 0x95671c9c mach_msg + 72
2 com.apple.CoreFoundation 0x926870ce CFRunLoopRunSpecific + 1790
3 com.apple.CoreFoundation 0x92687cf8 CFRunLoopRunInMode + 88
4 com.apple.Foundation 0x953beae8 -[NSConnection run] + 280
5 com.apple.Foundation 0x952bebad -[NSThread main] + 45
6 com.apple.Foundation 0x952be754 __NSThread__main__ + 308
7 libSystem.B.dylib 0x9569b6f5 _pthread_start + 321
8 libSystem.B.dylib 0x9569b5b2 thread_start + 34
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