signal

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'd like to compute power spectral density of time series; do some bandpass, lowpass, and highpass filtering; maybe some other basic stuff. Is there a nice open-source Java library to do this? I've hunted a bit without success (e.g., Googling "power spectral density java" or "signal processing java" and clicking through links, looking in Apache Commons, Sourceforge, java.net, etc.). There are lots of applets, books, tutorials, commercial products, etc., that don't meet my needs. Update : I found org.apache.commons.math.transform for Fourier

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm using HttpURLConnection to get a web service, the server is in the same network but the responce can be delayed to 60000ms (bcs of some complicated causes i must set it to 60000ms), when i hit listview item to call the webservice and waiting for the responce and loose the wifi signal and continue clicking the list my app crash with no exception the error is A/libc(9052): Fatal signal 6 (SIGABRT) on android at 0x000001e5 (code=0), thread 9052 more clear: webservice call+ wifi lost+ clicks = Fatal signal 6 code=0 I'm trying to avoid this

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am using Verizon's new LTE handset from HTC Thunderbolt. I cannot find the API to query for the signal strength while the handset is on LTE. By entering the field test mode ( # #4636# # ), I can see signal strength as -98dBm 2 asu. Anyone know what API I could use to get this info? 回答1: Warning : this solution should work for Android below API17. Some people may have troubles with newer api or specific phone brand (like Huawei) You need to use this code. In fact, all the information you need is here : String ssignal = signalStrength

目录 Django 信号 信号系统三要素： 信号的分类: Django 内置信号: 具体 Django 信号内容 定义信号 发送信号 接收信号 信号接收器 防止重复信号 Django 内置信号操作步骤 自定义信号操作步骤 创建文件 自定义信号 自定义信号接收器 自定义 信号发送语句 Django 信号 django自带一套信号机制来帮助我们在框架的不同位置之间传递信息。也就是说，当某一事件发生时，信号系统可以允许一个或多个发送者（senders）将通知或信号（signals）发送给一组接受者（receivers） 信号系统三要素： 信号 <class: django.dispatch.Signal > 的实例 发送方 某一个信号的发送者 接收方 一个或多个信号的接收者 信号的分类: Django 内置信号， 框架内置的 Signal 实例， 发送 方 为 Django 框架 自定义 信号 ， 开发者 手动创建 Signal 实例， 且需指定发送方 和 接收方 Django 内置信号: 框架位置： 位于框架 signals.py 文件中。 例如 框架内置的各 app 目录下的 django\contrib\APP\signals.py 文件中 和django\core\signals.py 文件中。 # 在ORM模型的save()方法调用之前或之后发送信号: django.db

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a worker thread that is listening to a TCP socket for incoming traffic, and buffering the received data for the main thread to access (let's call this socket A ). However, the worker thread also has to do some regular operations (say, once per second), even if there is no data coming in. Therefore, I use select() with a timeout, so that I don't need to keep polling. (Note that calling receive() on a non-blocking socket and then sleeping for a second is not good: the incoming data should be immediately available for the main thread,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a singleton class to download some data from the web. I am calling the download method of the singleton class from other class 'A' inside a GCD Queue and the downloads starts. The same time I am also executing this download method from a class 'B' in a GCD Queue. In this situation I want to inform the Class 'B' to wait until the download is completed. And when the download is completed give a copy of the downloaded data to class 'B' also. Here I am trying to download the same file from two classes A and B, otherwise there is no

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am working on a project and trying to use pthread_cond_wait() and pthread_cond_signal() to synchronize two threads. My code looks something like this: pthread_mutex_t lock_it = PTHREAD_MUTEX_INITIALIZER; pthread_cond_t write_it = PTHREAD_COND_INITIALIZER; int main(int argc, char**argv) { pthread_t t_send_segments, t_recv_acks; pthread_create(&t_send_segments, NULL, send_segments, (void*)NULL); pthread_create(&t_recv_acks, NULL, recv_acks, (void*)NULL); pthread_join(t_recv_acks, (void**)NULL); pthread_mutex_destroy(&lock_it); pthread_cond

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm currently writing a small shell in C++. Jobs and the PIDs associated with them are stored within a queue of job pointers (job *) . When a new job is run, information about it is added to the queue. Since multiple jobs can be handled simultaneously and new jobs can be entered at the shell's console at any time, I have a signal handler to wait on jobs which are terminated. When a job is terminated, I need to remove it's information from the active job queue and move it to my deque of terminated jobs. However, it is possible that a user's

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I keep getting the follow error in my Apache log: [Wed Sep 18 17:59:20 2013] [notice] Apache/2.2.22 (Ubuntu) PHP/5.3.10-1ubuntu3.8 with Suhosin-Patch configured -- resuming normal operations [Wed Sep 18 18:06:30 2013] [notice] child pid 7505 exit signal Segmentation fault (11), possible coredump in /etc/apache2 [Wed Sep 18 18:06:35 2013] [notice] child pid 7497 exit signal Segmentation fault (11), possible coredump in /etc/apache2 [Wed Sep 18 18:13:53 2013] [notice] child pid 7501 exit signal Segmentation fault (11), possible coredump in

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I want to know what ORA-24550: signal received: [si_signo=6] means? I know this is an oracle error and may an oracle latest patch can solve the issue. When this error is triggered, like the scenario where this signal has to be handled or whether this error occur when my application has to handle something related to oracle and the application failed to do that. 回答1: This is a sign that your Oracle client has received a signal it wasn't expecting. The Oracle docs say: ORA-24550: unhandled signal #number received. string Cause: Serious error: