deadlock

问题 I am trying to embedded a jetty server in my program and it seems to hang after each thread gets to server one request. The test case code I wrote is: import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.PrintWriter; import java.util.Date; import java.util.concurrent.atomic.AtomicLong; import org.apache.http.HttpEntity; import org

问题 I am using SQL Server 2008 Enterprise. I am wondering why even a single delete statement of this stored procedure will cause deadlock if executed by multiple threads at the same time? For the delete statement, Param1 is a column of table FooTable, Param1 is a foreign key of another table (refers to another primary key clustered index column of the other table). There is no index on Param1 itself for table FooTable. FooTable has another column which is used as clustered primary key, but not

问题 I get this strange deadlock when I try to synchronize two python3 scripts using 0mq ( ZeroMQ ). The scripts run fine for several thousand iterations, but sooner or later they both stop and wait for each other. I am running both scripts from different CMD-Windows on Windows 7. I cannot figure out why such a deadlock is even possible . What can go wrong here? Script A: while (1): context = zmq.Context() socket = context.socket(zmq.REP) socket.bind('tcp://127.0.0.1:10001') msg = socket.recv() #

问题 will .net Parallel Task exhaust all the threads in the pool the cause dead lock, the app hanged, incoming request can't be processed? My asp.net app hanged. So I scratched a dump. I use DebugDiag to analyze. Dump analyzing is below: 87.40% of threads blocked (229 threads) Total Threads: 232 Running Threads: 232 Idle Threads: 0 Max Threads: 400 Min Threads: 4 DebugDiag report is showing: The following threads in w3wp.DMP are waiting in a WaitOne ( 20 21 22 28 30 32 33 34 35 36 37 38 39 40 41

问题 I have a problem that realloc() deadlocks sometime after clone() syscall. My code is: #include <sched.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/syscall.h> #include <sys/types.h> #include <linux/types.h> #define CHILD_STACK_SIZE 4096*4 #define gettid() syscall(SYS_gettid) #define log(str) fprintf(stderr, "[pid:%d tid:%d] "str, getpid(),gettid()) int clone_func(void *arg){ int *ptr=(int*)malloc(10); int i; for (i=1; i<200000; i++) ptr = realloc(ptr, sizeof(int)

问题 i am facing a deadlock in one of my c application(its a big code) and I was able to debug down the stage where I printed a mutex. It looks like below - {__data = {__lock = 2, __count = 0, __owner = 15805, __nusers = 1, __kind = 0, __spins = 0, __list = {__prev = 0x0, __next = 0x0} }, __size = "\002\000\000\000\000\000\000\000½=\000\000\001", '\0' <repeats 26 times>, __align = 2 } Now i could understand that __owner is thread id of thread holding this mutex, same thread ends up in deadlock for

问题 I am trying to wrap my head around synchronously calling async functions and deadlock. In the below example I am blocking an async call which internally uses ConfigureAwait(false) which as far as I can tell should prevent deadlock. The first call to the web service does not deadlock. However, the second one that happens within a continuation that syncs back to the UI thread deadlocks. GetBlocking_Click is a click event in a WPF app so both the first and the second request happen on the UI

问题 I have a set of methods that all synchronize to the class object (can't use self, because multiple instances of this object could be used in multiple threads). Some of those methods call other methods in the class that also synchronize on the class object. Somehow this works and does not cause the deadlock I would expect it to. I would assume that testA would be blocked from running because testB already has a lock on the class object, but this apparently isn't the case. Is it something

问题 I am using SQL Server 2008 Enterprise. And using ADO.Net + C# + .Net 3.5 + ASP.Net as client to access database. When I access SQL Server 2008 tables, I always invoke stored procedure from my C# + ADO.Net code. I have 3 operations on table FooTable. And Multiple connections will execute them at the same time in sequences, i.e. executes delete, the execute insert and then execute select. Each statement (delete/insert/select) is of a separate individual transaction in the single store procedure

问题 I'm troubleshooting some deadlocks I'm seeing in a production environment and I'm new to this but something seemed odd to me. So I have the deadlock graph below: The right side of the deadlock is an update that is the following: UPDATE order_sub_line SET sub_line_status = 300 WHERE order_sub_line_id = '75C387EC-A1A7-4587-9FA0-DD33A49009BC' It looks to me in the graph that this update is trying to acquire 2 page locks. order_sub_line_id is a clustered index. Should this be trying to acquire 2