C++11 Thread::d Etach (2)

Original address: http://www.cplusplus.com/reference/thread/thread/detach/Public member function<thread> std::thread::d etach

void Detach ();

Detach Thread

Detaches the thread represented by the object from the calling thread, allowing them to execute independently from each OT Her.

detach this thread from the calling thread to allow this thread to execute independently. ( But when the main process is finished, even detach () out of the sub-thread will be forced to kill whether or not it is completed )

Example:

#include <iostream> #include <thread> #include <vector> #include <ctime> #include <fstream >using namespace Std;//delay (n) delay n sec  void Delay (double sec)  {      time_t start_time, cur_time;//Variable declaration      Time (&start_time);      Do {time          (&cur_time);          } while ((Cur_time-start_time) < sec);  };  void Show (int n) {ofstream fout ("Detach.txt"); if (!fout.is_open ()) cout<< "Open failed!" <<endl;while (n>0) {fout<< "1currentThread is" <<pthread_self () << ", now N is" <<n< <endl;delay (0.2); n--;} fout<< "OK" <<endl;fout.close ();} int main () {cout<< "main starts" <<endl;thread T (show,100); T.detach ();d elay (1);cout<< "main complete !" <<endl;}

Run:

can be seen, when the process is finished, even if detach does not complete the task, it will be forced to kill. .

Both threads continue without blocking nor synchronizing in any. Note that if either one ends execution, its resources is released.

Two threads do not clog or sync, and note that the resources held at the end of any one of them will be released.

After a call to this function, the thread object becomes non-joinable and can is destroyed safely.

After the method is called, the thread object becomes unreachable and can be safely destroyed.

Example:

ParametersNone

Return ValueNone

Example

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#include <iostream>//Std::cout#include <thread>//Std::thread, Std::this_thread::sleep_for#include <chrono>//Std::chrono::seconds voidPause_thread (intN) {std::this_thread::sleep_for (Std::chrono::seconds (n)); Std::cout <<"pause of "<< N <<" seconds ended\n";}intMain () {std::cout <<"Spawning and detaching 3 threads...\n"; Std::thread (pause_thread,1). Detach (); Std::thread (pause_thread,2). Detach (); Std::thread (pause_thread,3). Detach (); Std::cout <<"Done spawning threads.\n"; Std::cout <<"(the main thread will now pause for 5 seconds)\n";//give the detached threads time to finish (and not guaranteed!):Pause_thread (5);return0;}

Edit & Run

Output (after 5 seconds):

Spawning and detaching 3 threads...Done spawning threads.(the main thread will now pause for 5 seconds)pause of 1 seconds endedpause of 2 seconds endedpause of 3 seconds endedpause of 5 seconds ended

Data RacesThe object is modified.

Exception Safety Basic Guarantee: If an exception are thrown by this member function, the object is left in thread a valid state .

If The call fails, a system_error exception is thrown:

Exception Type	error Condition	Description
system_error	errc::invalid_argument	The thread object is not joinable
system_error	errc::no_such_process	The thread object is not valid

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Reprint Please specify source: http://blog.csdn.net/qq844352155

Author: unparalleled

Email:[email protected]

2014-9-3

From Gdut

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C++11 Thread::d Etach (2)