c++ - Why does Windows 10 start extra threads in my program? -

-

with visual studio 2015, in new, empty c++ project, build following console application:

int main() {     return 0; }

set break point on return , launch program in debugger. on windows 7, of break point, program has 1 thread. on windows 10, has five(!) threads: main thread , 4 "worker threads" waiting on synchronization object.

who's starting thread pool (or how find out)?

crystal ball says debug > windows > threads window shows these threads @ ntdll.dll!tppworkerthread. sure enable microsoft symbol server see yourself, use tools > options > debugging > symbols.

this happens in vs2013 not caused new vs2015 diagnostic features, @adam's guess cannot correct.

tppworkerthread() entrypoint thread-pool thread. when set breakpoint debug > new breakpoint > function breakpoint on function. got lucky capture stack trace 1st threadpool thread when 2nd threadpool thread started executing:

    ntdll.dll!_ntopenfile@24()  unknown     ntdll.dll!ldrpmapdllntfilename()    unknown     ntdll.dll!ldrpmapdllsearchpath()    unknown     ntdll.dll!ldrpprocesswork() unknown     ntdll.dll!_ldrpworkcallback@12()    unknown     ntdll.dll!tppworkpexecutecallback() unknown     ntdll.dll!tppworkerthread() unknown     kernel32.dll!@basethreadinitthunk@12()  unknown     ntdll.dll!__rtluserthreadstart()    unknown >   ntdll.dll!__rtluserthreadstart@8()  unknown

clearly loader using threadpool on windows 10 load dlls. that's new :) @ point main thread executing in loader, concurrency @ work.

so windows 10 taking advantage of multiple cores process initialized faster. feature, not bug :)


Comments

Post a Comment

Popular posts from this blog

c - How to retrieve a variable from the Apache configuration inside the module? -

-
i'm building custom apache module. how retrieve variable apache configuration inside module? see variable "some_var_config_from_apache_or_htaacess" inside apache module: /* source: http://people.apache.org/~humbedooh/mods/examples/mod_example_1.c */ /* include required headers httpd */ #include "httpd.h" #include "http_core.h" #include "http_protocol.h" #include "http_request.h" static void register_hooks(apr_pool_t *pool); static int example_handler(request_rec *r); /* define our module entity , assign function registering hooks */ module ap_module_declare_data example_module = { standard20_module_stuff, null, // per-directory configuration handler null, // merge handler per-directory configurations null, // per-server configuration handler null, // merge handler per-server configurations null, // directives may have httpd register_hoo
Read more

c# - Constructor arguments cannot be passed for interface mocks -

-
when debug code , read line mocklessonplannerafactory creation error: constructor arguments cannot passed interface mocks. var mockschoolclasscodeservice = new mock<ischoolclasscodeservice>(); var mockdateservice = new mock<idateservice>(); var mocklessonplannerafactory = new mock<ilessonplannerafactory>(mockdateservice.object); var mocklessonplannerbfactory = new mock<ilessonplannerbfactory>(mockdateservice.object); var service = new timetableservice(mockunitofwork.object, mocklessonplannerafactory.object, mocklessonplannerbfactory.object, mockschoolclasscodeservice.object); my timetableservice accepts instances of interface type only. mocklessonplannerafactory , bfactory... want in constructor idateservice passed. what wrong code? the clue in error message "constructor arguments cannot passed interface mocks." the mock created interface have default constructor because interfaces don't have constructor. remember mockin
Read more

python - malformed header from script index.py Bad header -

-
i want run python code in apache2(ubuntu 14.04) server. have followed these steps , getting error: step 1: configuration 1: have created directory , file under /var/www/cgi-bin configuration 2 : have edited /etc/apache2/sites-available/000-default.conf alias /cgi-bin /var/www/cgi-bin <directory "/var/www/cgi-bin"> options indexes followsymlinks execcgi addhandler cgi-script .cgi .py allow </directory> <directory /var/www/cgi-bin> options </directory> step 2: and python script is: index.py #!/usr/bin/env python import cgi; import cgitb;cgitb.enable() print "content-type: text/plain\n" print "<b>hello python</b>" step 3: when ran through chrome browser using: url : http://localhost/cgi-bin/index.py step 4: i getting error in error-log malformed header script 'index.py': bad header: hello python you should end header \r\n, must print out yet \r\n signal body coming. (i
Read more