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  • multi-thread access MySQL error

    - by user188916
    I have written a simple multi-threaded C program to access MySQL,it works fine except when i add usleep() or sleep() function in each thread function. i created two pthreads in the main method, int main(){ mysql_library_init(0,NULL,NULL); printf("Hello world!\n"); init_pool(&p,100); pthread_t producer; pthread_t consumer_1; pthread_t consumer_2; pthread_create(&producer,NULL,produce_fun,NULL); pthread_create(&consumer_1,NULL,consume_fun,NULL); pthread_create(&consumer_2,NULL,consume_fun,NULL); mysql_library_end(); } void * produce_fun(void *arg){ pthread_detach(pthread_self()); //procedure while(1){ usleep(500000); printf("producer...\n"); produce(&p,cnt++); } pthread_exit(NULL); } void * consume_fun(void *arg){ pthread_detach(pthread_self()); MYSQL db; MYSQL *ptr_db=mysql_init(&db); mysql_real_connect(); //procedure while(1){ usleep(1000000); printf("consumer..."); int item=consume(&p); addRecord_d(ptr_db,"test",item); } mysql_thread_end(); pthread_exit(NULL); } void addRecord_d(MYSQL *ptr_db,const char *t_name,int item){ char query_buffer[100]; sprintf(query_buffer,"insert into %s values(0,%d)",t_name,item); //pthread_mutex_lock(&db_t_lock); int ret=mysql_query(ptr_db,query_buffer); if(ret){ fprintf(stderr,"%s%s\n","cannot add record to ",t_name); return; } unsigned long long update_id=mysql_insert_id(ptr_db); // pthread_mutex_unlock(&db_t_lock); printf("add record (%llu,%d) ok.",update_id,item); } the program output errors like: [Thread debugging using libthread_db enabled] [New Thread 0xb7ae3b70 (LWP 7712)] Hello world! [New Thread 0xb72d6b70 (LWP 7713)] [New Thread 0xb6ad5b70 (LWP 7714)] [New Thread 0xb62d4b70 (LWP 7715)] [Thread 0xb7ae3b70 (LWP 7712) exited] producer... producer... consumer...consumer...add record (31441,0) ok.add record (31442,1) ok.producer... producer... consumer...consumer...add record (31443,2) ok.add record (31444,3) ok.producer... producer... consumer...consumer...add record (31445,4) ok.add record (31446,5) ok.producer... producer... consumer...consumer...add record (31447,6) ok.add record (31448,7) ok.producer... Error in my_thread_global_end(): 2 threads didn't exit [Thread 0xb72d6b70 (LWP 7713) exited] [Thread 0xb6ad5b70 (LWP 7714) exited] [Thread 0xb62d4b70 (LWP 7715) exited] Program exited normally. and when i add pthread_mutex_lock in function addRecord_d,the error still exists. So what exactly the problem is?

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  • Design-time properties in IB?

    - by Krumelur
    Coming from the .NET world into ObjC and iPhone development, I'm used to providing design-time support for my UI classes. For example, say that I have a custom button class with a color property. I want to be able to set this color in design time from IB. How can I accomplish this? Is it even possible? Worth the effort?

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  • Is there a way to jail in Javascript, so that the DOM isn't visible

    - by TiansHUo
    I would really like to provide the user some scripting capabilities, while not giving it access to the more powerful features, like altering the DOM. That is, all input/output is tunneled thru a given interface. Like a kind of restricted javacsript. Example: If the interface is checkanswer(func) this are allowed: checkanswer( function (x,y)={ return x+y; } but these are not allowed: alert(1) document.write("hello world") eval("alert()")

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  • Error with python decorator

    - by Timmy
    I get this error object has no attribute 'im_func' with this class Test(object): def __init__(self, f): self.func = f def __call__( self, *args ): return self.func(*args) pylons code: class TestController(BaseController): @Test def index(self): return 'hello world'

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  • Can a System Analyst come outside of programming?

    - by WeNeedAnswers
    Back in the day, if you wanted to be a Systems Analyst you had to work up the ranks from humble programmer. But these days there are University Courses/Programmes based on this topic alone. Is it thus valid for a graduate or post graduate to come into the world and just do systems analyst without doing the graft of being a programmer first, getting to know the nuances of what code is all about.

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  • Using #DEBUG macros in spark

    - by Quintin Par
    I have some scripts which need to be included only in the release version. Stuff like google analytics, quantserve etc. The typical way in asp.net mvc world is to wrap a #if DEBUG #endif How do I do it the sparkish way. Like <script if='x==5' type="text/javascript">

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  • Best printing tools, components for windows.forms applications.

    - by mkus
    Hi, I have started to research for a printing component in our windows.forms based project. I want to benefit from your experiences. There are some popular reporting tools in .net world such as crystal report, active reports, xtrareports etc. Could you say advantages and disadvantages of these tools or other tools you suggest?

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  • After RAID failure SBS 2008 issues logging in and Exchange store does not mount

    - by Josh R
    today has been one of those days. Yesterday a hard drive in our Dell Poweredge 2900 server failed and the RAID array didn't degrade gracefully, so I called Dell (Server still under warranty) and got an engineer to work though the RAID issues with me. He was a nice guy but didn't do too much. We tried to put the RAID in a state where it was bootable and even though we only lost one disk there are still issues with the server. Once we got the server to boot there was an error message saying that the logonui.exe was corrupted and we needed to run chkdsk. I clicked through the error messages and the login screen never came up. So I power cycled the server and it chkdsk automatically but the login screen didn't appear. I tried safe mode, no difference there either. So the issues I am currently having are: 1) The server boots up, the loading windows screen comes up then it dumps me into a black screen where I can only see my mouse cursor. Ctrl+Esc doesn't work Ctrl+Alt+Del doesn't work 2) Some of the services come up: DHCP, DNS, DFS, and Print come up 3) The exchange information store and transport service don't start - I tried using mmc to connect to services.msc on the computer and start them but they throw an error message of "Can't start because group or dependency failed" Has anyone had a problem like this? Can anyone offer some guidance? Thanks a bunch!

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  • DRY up Ruby ternary

    - by Reed G. Law
    I often have a situation where I want to do some conditional logic and then return a part of the condition. How can I do this without repeating the part of the condition in the true or false expression? For example: ClassName.method.blank? ? false : ClassName.method Is there any way to avoid repeating ClassName.method? Here is a real-world example: PROFESSIONAL_ROLES.key(self.professional_role).nil? ? 948460516 : PROFESSIONAL_ROLES.key(self.professional_role)

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  • MapReduce programming system in java-actionscript

    - by eco_bach
    Just finished reading ch23 in the excellent 'Beautiful Code' http://oreilly.com/catalog/9780596510046 on Distributed Programming with MapReduce. I understand that MapReduce is a programming system designed for large-scale data processing problems, but I have a hard time getting my head around the basic examples given and how I might apply them in real world situations. Can someone give a simple example of MapReduce implemented using either java, javascript or actionscript?

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  • Is there a good, free raw HTML editor with auto-complete, auto-formatting and syntax highlighting?

    - by joshcomley
    I'm used to Visual Studio, so in an ideal world I would like something that meets the following criteria: Lightweight CSS auto-complete HTML auto-complete CSS auto-formatting HTML auto-formatting Syntax highlighting Notepad2 has syntax highlighting, but no auto-complete and no auto-formatting. Any thoughts? Please don't answer with "Visual Studio"! I'm after something very lightweight (if it exists).

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  • calling dll function from php program

    - by satish-fbg
    I've made a program in php where i got to call a dll function.. that dll contains some hashcode.. i call this dll's function from vb6 through this code: Private Declare Function GetHash Lib "hashGen.dll" (ByVal tEncode As String) As Long Private Sub get_Key() MsgBox GetHash("hello world") end sub can anybody tell me how to call this function in PHP? here's my dll file: http://www.4shared.com/file/-hdichIS/hashGen.html thnx..

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  • CSS: content:"\00a0"

    - by SteD
    Today I came across a new CSS syntax that I have never seen before content:"\00a0"; Checking it on w3schools, it explains: Definition and Usage The content property is used with the :before and :after pseudo-elements, to insert generated content. My question is, can you point out to me in real world example, how do we use this 'content' syntax? And what does the \00a0 mean in this case?

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