Dear all,
I am implementing a TCP client to send messages with BSD sockets. A BOOL
variable, isConnected, is used to detect if the TCP connection is built.
Since the client must be accessed by multiple threads, a NSLock,
isConnectedLock is used.
When testing, after invoking the methods, Connect and SendMessage, I release
the client. However, I got an exception as follows.
**** -[NSLock dealloc]: lock (<NSLock: 0x100614cc0> '(null)') deallocated
while still in use*
**** Break on _NSLockError() to debug.*
What is the potential problem?
Thanks so much!
Bing
- (BOOL) Connect
{
[isConnectedLock lock];
if (!isConnected)
{
destinationSocket = socket(AF_INET, SOCK_STREAM,
IPPROTO_TCP);
if (destinationSocket < 0)
{
return NO;
}
memset(&destinationAddress, 0, sizeof(destinationAddress));
destinationAddress.sin_family = AF_INET;
const char *ip = [DestinationIP UTF8String];
int isAddressValidate = inet_pton(AF_INET, ip,
&destinationAddress.sin_addr.s_addr);
if (isAddressValidate == 0)
{
return NO;
}
else if (isAddressValidate < 0)
{
return NO;
}
destinationAddress.sin_port = htons(PortNumber);
if (connect(destinationSocket, (struct sockaddr
*)&destinationAddress, sizeof(destinationAddress)) < 0)
{
return NO;
}
isConnected = YES;
}
[isConnectedLock unlock];
return YES;
}
- (BOOL) SendMessage:(char *)message
{
[isConnectedLock lock];
if (isConnected)
{
size_t messageLength = strlen(message);
ssize_t bytesCount = send(destinationSocket, message,
messageLength, 0);
if (bytesCount < 0)
{
return NO;
}
else if (bytesCount != messageLength)
{
return NO;
}
return YES;
}
else
{
return NO;
}
[isConnectedLock unlock];
}
- (BOOL) Disconnect
{
[isConnectedLock lock];
if (isConnected)
{
close(destinationSocket);
isConnected = NO;
}
[isConnectedLock unlock];
return YES;
}
- (void) dealloc
{
[CommKey release];
[DestinationIP release];
[isConnectedLock release];
[super dealloc];
}
@end
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