pthreads

pthread is not starting for class instance

由 白昼怎懂夜的黑 提交于 2020-05-24 04:04:56
问题 NOTE: C++98 Hi, I'm a little new to c++ and I am writing a databaes program and am attempting to start a timer using the boost::asio package using pthread. The aim of the timer is to start after sql queries have been placed inside a buffer, of which will run an execute function if nothing has been received for a period of time. I have managed to get it to compile, but it doesn't look like the pthread instance is starting. I have called the pthread inside my getInstance method, and the boost:

Create pthread with the function of multiple arguments

由 蹲街弑〆低调 提交于 2020-05-13 06:35:42
问题 If I am going to create a pthread for the following function. Assume everything is properly delared. pthread_create(&threadId, &attr, (void * (*)(void*))function, //what should be the arguments for here??); int a = 0; int b = 1; //c and d are global variables. void function(int a, int b){ c = a; d = b; } 回答1: This does not work. function() has to take exactly one argument. That's why you have to do this: (void * ( )(void )) You're telling your compiler "no, seriously, this function only takes

pthread_key_create destructor not getting called

由 杀马特。学长 韩版系。学妹 提交于 2020-05-12 12:06:09
问题 As per pthread_key_create man page we can associate a destructor to be called at thread shut down. My problem is that the destructor function I have registered is not being called. Gist of my code is as follows. static pthread_key_t key; static pthread_once_t tls_init_flag = PTHREAD_ONCE_INIT; void destructor(void *t) { // thread local data structure clean up code here, which is not getting called } void create_key() { pthread_key_create(&key, destructor); } // This will be called from every

How to use pthread header file in C project in CLion which uses MinGW in windows

由 时光总嘲笑我的痴心妄想 提交于 2020-05-09 05:29:05
问题 I am trying to include #include <pthread.h> in my project which uses CLion but I am cannot use it directly. Is there any specific way to include pthread to a C project? 回答1: I finally came up with a solution. Since I am using MinGW I Used MinGW installation manager and install packages that need to execute pthreads and openmp related tasks in CLion. Here is the procedure. After opening the installation manager go to all packages and select the select packages named using mingw32-pthreads-w32

Strange behavior when functions created in pthread_create accept pointer-to-int

由 二次信任 提交于 2020-04-18 03:49:15
问题 #include <stdio.h> #include <pthread.h> void *runner(void * p) { int *line = p; printf("line: %d\n", *line); } int main() { pthread_t tid[2]; for (int i = 0; i < 2; i++) pthread_create(&tid[i], 0, runner, &i); for (int i = 0; i < 2; i++) pthread_join(tid[i], NULL); return 0; } For the above code I expect the output to be line 0 line 1 But the output is actually line 1 line 2 So what is wrong with this code? How did i get incremented? Do I have to pass struct s to the runner function? 回答1:

Strange behavior when functions created in pthread_create accept pointer-to-int

由 蹲街弑〆低调 提交于 2020-04-18 03:47:38
问题 #include <stdio.h> #include <pthread.h> void *runner(void * p) { int *line = p; printf("line: %d\n", *line); } int main() { pthread_t tid[2]; for (int i = 0; i < 2; i++) pthread_create(&tid[i], 0, runner, &i); for (int i = 0; i < 2; i++) pthread_join(tid[i], NULL); return 0; } For the above code I expect the output to be line 0 line 1 But the output is actually line 1 line 2 So what is wrong with this code? How did i get incremented? Do I have to pass struct s to the runner function? 回答1:

查看当前cpu和内存占用最多的的程序

由 落爺英雄遲暮 提交于 2020-04-14 17:40:10
【推荐阅读】微服务还能火多久？>>> 查看当前cpu和内存占用最多的的程序 1.CPU占用最多的前10个进程： ps auxw|head -1;ps auxw|sort -rn -k3|head -10 2.内存消耗最多的前10个进程 ps auxw|head -1;ps auxw|sort -rn -k4|head -10 根据第一行的数值进行倒序查询 USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND 查看过去时间cpu和内存占用情况 sar -r sar -r 1 4 sar命令使用格式： sar + 命令行选项(可选) + 间隔时间(可选) + 次数(可选) 常用来判断一个系统瓶颈问题 查询CPU 可用 sar -u 和 sar -q 查询内存 可用 sar -B、sar -r 和 sar -W 查询io 可用 sar -b、sar -u 和 sar -d 参考： https://blog.csdn.net/GX_1_11_real/article/details/81318197 USER //用户名 %CPU //进程占用的CPU百分比 %MEM //占用内存的百分比 VSZ //该进程使用的虚拟內存量（KB） RSS //该进程占用的固定內存量（KB）resident set size STAT //进程的状态

PHP 高级编程之多线程-消息队列

由 最后都变了- 提交于 2020-04-14 01:01:49
【今日推荐】：为什么一到面试就懵逼！>>> Home | Mirror | Search | 杂文 | ITEYE 博客 | OSChina 博客 | 51CTO 博客 | Linkedin PHP 高级编程之多线程 http://netkiller.github.io/journal/thread.php.html Mr . Neo Chen (netkiller) , 陈景峰(BG7NYT) 中国 广东省 深圳市 龙华新区民治街道溪山美地 518131 +86 13113668890 +86 755 29812080 < netkiller@msn.com > 版权 © 2011, 2012, 2013, 2014 http://netkiller.github.io 版权声明 转载请与作者联系，转载时请务必标明文章原始出处和作者信息及本声明。 文档出处: http://netkiller.github.io http://netkiller.sourceforge.net $Date$ 摘要 2014-03-12 第一版 2014-05-15 第二版 2014-06-13 第三版 2014-07-24 第四版 我的系列文档 Netkiller Architect 手札 Netkiller Developer 手札 Netkiller PHP 手札 Netkiller

linking pthread library issue

由 两盒软妹~` 提交于 2020-04-13 06:01:11
问题 Am facing a problem that may be slightly complicated to explain and understand as giving the entire picture would be too big and difficult. Please excuse me for it. Consider the following Makefile: all: clients.so simulator backup LD_PRELOAD=/home/Juggler/client/clients.so ./simulator backup: backup.c libclient.a gcc backup.c -o backup -L /home/Juggler/client -L. -lclient -ldl simulator: simulator.c libclient.a gcc -g simulator.c -o simulator -L /home/Juggler/client -L. -lclient -ldl -pthread

linking pthread library issue

由 半腔热情 提交于 2020-04-13 06:00:51
问题 Am facing a problem that may be slightly complicated to explain and understand as giving the entire picture would be too big and difficult. Please excuse me for it. Consider the following Makefile: all: clients.so simulator backup LD_PRELOAD=/home/Juggler/client/clients.so ./simulator backup: backup.c libclient.a gcc backup.c -o backup -L /home/Juggler/client -L. -lclient -ldl simulator: simulator.c libclient.a gcc -g simulator.c -o simulator -L /home/Juggler/client -L. -lclient -ldl -pthread
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