popen管减慢其他线程

本文介绍了popen管减慢其他线程的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 我的多线程应用程序有问题。当在一个线程执行同步 popen（）命令 - 其他应用程序线程显着减慢。用 popen（）的线程执行 ffmpeg ，会产生高负载。 $ b b 通常，其他线程的执行时间为0.0007 ms。当使用 popen 时，某些线程的执行时间增加到14-20秒。 如何解决这个问题？ 系统是FreeBSD 6.4 FILE * pipe; char buff [512]; if（！（pipe = popen（command.c_str（），r））） {//如果pipe为NULL return false; } while（fgets（buff，sizeof（buff），pipe）！= NULL） { ptr_output-& } 这里是popen的新代码，不会帮助：正确的代码 - 带有popen的非阻塞管道 I have problem with my multithread application. When at one thread executing synchronous popen() command - other application threads are slow down significantly. Thread with popen() execute ffmpeg, that generates high load.Normally, other threads execution time is 0.0007 ms. And when popen is used, some threads are increasing there execution time up to 14-20 seconds. How to solve this problem?System is FreeBSD 6.4 FILE *pipe; char buff[512]; if ( !(pipe = popen( command.c_str(), "r")) ) { // if pipe is NULL return false; } while ( fgets(buff, sizeof(buff), pipe) != NULL ) { ptr_output->append(buff); }here is new code of popen can that does NOT help: Correct Code - Non-blocking pipe with popen 解决方案 fgets is a blocking read, so while the thread above is waiting for data to be read from the pipe, the other threads are blocked. You will want to use select/poll for with a file descriptor to see if you have data on the pipe before you issue a read. That way, you can preempt this thread, and let other threads run doing useful work. 这篇关于popen管减慢其他线程的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！