wait

问题 This is the C code to test fork() system call: #include<stdio.h> #include<stdlib.h> #include<sys/types.h> #include<unistd.h> #include<wait.h> int main(int argc, char *argv[]) { printf("I am: %d\n", (int)getpid()); pid_t pid = fork(); printf("fork returned: %d\n", (int)pid); if (pid < 0) { perror("fork failed"); } if (pid==0) { printf("I am the child with pid %d\n", (int)getpid()); sleep(5); printf("Child exiting...\n"); exit(0); } printf("I am the parent with pid %d, waiting for the child\n",

问题 After making a tcp connection to a server, I close my linux application and Socket.close() is called. Checking netstat -pant, I see the connection is in TIME_WAIT status. This prevents me from making an immediate connection back to the server since I'm using the same port to connect from. Instead, I have to wait for the connection to timeout of the TIME_WAIT status before I can reconnect again. I've played around -without luck- with the socket methods: set_so_timeout(), set_keepalive(), set

问题 Hello I am trying to create a please wait screen.This screen will appear when my program requests data from web service and will hide when the process is finished.Also I want to add a time out if request process lasts longer than 90 seconds. can anyone help or show me a guiding example about that matter. public static void showBusyDialog() { try { if (busyDialog == null) { busyDialog = new Dialog("Please Wait", null, null, 0, Bitmap.getPredefinedBitmap(Bitmap.HOURGLASS)); busyDialog

问题 I have below program having 2 threads T1 and T2. T1 is running first and goes into waiting state. T2 is calling notify. Why T1 thread doesn't resumes and prints "Thread-0 is waken up" public class WaitNotifyTest{ public static void main(String[] args) { Thread t1 = new Thread(new Runnable() { @Override public void run() { synchronized (this) { System.out.println(Thread.currentThread().getName() + " is running"); try { wait(); } catch (InterruptedException e) { e.printStackTrace(); } System

问题 I have this batch file: SET WINRAR="C:\Program Files (x86)\WinRAR" start "" %WINRAR%\WinRAR.exe a -u -m5 "Group 1.rar" "Group 1" "Group 1" start "" %WINRAR%\WinRAR.exe a -u -m5 "Group 2.rar" "Group 2" "Group 2" start "" %WINRAR%\WinRAR.exe a -u -m5 "Group 3.rar" "Group 3" "Group 3" start "" "D:\" I want all the rar processes to work at the same time and to open the directory D:\ after rar finishes. 回答1: You can achieve this by starting your un-rar processes without /WAIT and check whether

问题 Does a while(true) Java loop together with wait(1) use more or less resources than a blocking loop with wait() and notify() ? And do the CPU cores have some special (hardware) implementations to allow wait(1) ? If yes, are there any limitations while working with such non-blocking loops? An example: while(true){ wait(1); //do the job here... } (Just a note: Without the wait(1) a core would go radical 100% in a while(true) loop...) 回答1: As to the original question of why while (true); takes up

问题 I have a small shell that creates children (with fork()) and make them execute some commands with execvp. It support also the & option so the father can run other commands in the meanwhile. When a child die i want to write that on the console and also the child pid, so i defined a sighandler for SIGCHLD: void backdeadchild(int sig) { int pid, exitstat; pid = wait(&exitstat); printf("Child with pid: %d died", pid); } The problem is that after the handler prints the message also the father

问题 I want to use execl in child process after doing fork. execl will execute the script which will take around 120 seconds of time. I tried almost all the combination with waitpid, wait and waitid with different argument (0, WNOHANG, etc.,) but in all case I am getting -1 return value. So I want to know in which wait function I need to use when? So I can concentrate in one wait function to make it work. One more interesting thing which I observed from my logs is that when I am doing nothing in

问题 What I try to do: If a user is pressing a button, a new view controller is being loaded and pushed to the navigation Controller. The new view controller is doing some hard database querying in it's ViedDidLoad Method which causes some seconds to get the view loaded. I'm trying to show a wait indicator before the view is starting to load. If I try to add a UIActivityIndicatorView as subview of my starting view right before the new view is being allocated, the indicator is shown AFTER the new

问题 I would like to create a custom FunctionPlotter component that is based on the JavaFx WebEngine. My plots will be shown in a browser. Before I execute my plot commands I have to wait until the browser has been initialized (it loads d3.js). Currently I do so by putting my plot expressions in a Runnable and pass that runnable to the FunctionPlotter. (The FunctionPlotter passes the runnable to the loading finished hook of the browser): private FunctionPlotter plotter; ... Runnable plotRunnable =