signals

问题 I want to save boost signals objects in the map (association: signal name → signal object). The signals signature is different, so the second type of map should be boost::any . map<string, any> mSignalAssociation; The question is how to store objects without defining type of new signal signature? typedef boost::signals2::signal<void (int KeyCode)> sigKeyPressed; mSignalAssociation.insert(make_pair("KeyPressed", sigKeyPressed())); // This is what I need: passing object without type definition

问题 I follow the guide to running signal server at this link: https://github.com/lucaconte/BeatTheMeddler When i try to run the PushServer at this step: java -jar Push-Server-<VERSION>-capsule-fat.jar server YourPushServerConfigFile.yml Then an error raised: Failed to find Premain-Class manifest attribute in ...\PushServer\target\Push-Server-0.12.0-capsule-fat.jar Error occurred during initialization of VM agent library failed to init: instrument CAPSULE: Client connection failed. CAPSULE

问题 By control transfer, I mean, after the tracee executing a function and return, which signal is generated so that GDB can wait*() on it and seize control again? It is not SIGTRAP though many people claim that ... 回答1: after the tracee executing a function and return, which signal is generated so that GDB can wait*() on it and seize control again? The tracee is stopped, and control is transferred back to GDB, only when one of "interesting" events happens. The interesting events are: A

问题 I'm trying to make a program that creates a file, writes 0 into it and then, using a child process, alternates the incrementation of that that value. For example, the child should increment that value to 1, and writes it back to the file. After this, the parent increments it to 2 and writes it in the file. The child to 3, and so on. Synchronization between the processes is done via signals. Here is the source code: #include <stdio.h> #include <fcntl.h> #include <unistd.h> #include <signal.h>

问题 In Linux/Qt I have a GUI application. The GUI starts up additional child processes using QProcess. To close the child processes I use QProcess::close(). Does QProcess::close() raise the unix SIGTERM signal for the child process? (I have linked to the Qt documentation for QProcess and close() because I can not tell from the documentation if a unix signal is raised...) UPDATE: changed question to ask about a specific unix signal: SIGTERM. 回答1: Today I found out that QProcess::close() does not

问题 So, I'm trying to achieve the following: The user shall be able to fill out multiple gtk_entry 's and click Apply after that, on being clicked I want the Apply button to emit a signal, something like this: g_signal_connect (G_OBJECT (Apply), "clicked", G_CALLBACK(apply_clicked), # an argument #); Afterwards, in apply_clicked() , I want the entered text to be saved. My question is: How do I pass those gtk_entry 's to my callback function apply_clicked ? If it were only one I'd just set it as #

问题 So, I'm trying to achieve the following: The user shall be able to fill out multiple gtk_entry 's and click Apply after that, on being clicked I want the Apply button to emit a signal, something like this: g_signal_connect (G_OBJECT (Apply), "clicked", G_CALLBACK(apply_clicked), # an argument #); Afterwards, in apply_clicked() , I want the entered text to be saved. My question is: How do I pass those gtk_entry 's to my callback function apply_clicked ? If it were only one I'd just set it as #

问题 kill - does it kill the process right away? I found my answer and I set up a signal handler for SIGCHLD and introduced wait in that handler. That way, whenever parent process kill s a child process, this handler is called and it calls wait to reap the child. - motive is to clear process table entry. I am still seeing some child processes going for a few seconds even without its parent process dying. - how is this possible? I am seeing this via ps . Precisely ps -o user,pid,ppid,command -ax

问题 kill - does it kill the process right away? I found my answer and I set up a signal handler for SIGCHLD and introduced wait in that handler. That way, whenever parent process kill s a child process, this handler is called and it calls wait to reap the child. - motive is to clear process table entry. I am still seeing some child processes going for a few seconds even without its parent process dying. - how is this possible? I am seeing this via ps . Precisely ps -o user,pid,ppid,command -ax

问题 This works as expected since Perl 5.10.1: SIGINTs are trapped. #!/usr/bin/perl use strict; use warnings; $SIG{INT} = sub { die "Caught a sigint $!" }; sleep(20); But here SIGINTs are not trapped. #!/usr/bin/perl use strict; use warnings; $SIG{INT} = sub { die "Caught a sigint $!" }; END { sleep(20); } This can be fixed by setting the handler again in the END block, like so: END { $SIG{INT} = sub { die "Caught a sigint $!" }; sleep(20); } But that won't work if you have more than one block: